meaning of unstable presentation

Fetal Presentation, Position, and Lie (Including Breech Presentation)

  • Key Points |

Abnormal fetal lie or presentation may occur due to fetal size, fetal anomalies, uterine structural abnormalities, multiple gestation, or other factors. Diagnosis is by examination or ultrasonography. Management is with physical maneuvers to reposition the fetus, operative vaginal delivery , or cesarean delivery .

Terms that describe the fetus in relation to the uterus, cervix, and maternal pelvis are

Fetal presentation: Fetal part that overlies the maternal pelvic inlet; vertex (cephalic), face, brow, breech, shoulder, funic (umbilical cord), or compound (more than one part, eg, shoulder and hand)

Fetal position: Relation of the presenting part to an anatomic axis; for transverse presentation, occiput anterior, occiput posterior, occiput transverse

Fetal lie: Relation of the fetus to the long axis of the uterus; longitudinal, oblique, or transverse

Normal fetal lie is longitudinal, normal presentation is vertex, and occiput anterior is the most common position.

Abnormal fetal lie, presentation, or position may occur with

Fetopelvic disproportion (fetus too large for the pelvic inlet)

Fetal congenital anomalies

Uterine structural abnormalities (eg, fibroids, synechiae)

Multiple gestation

Several common types of abnormal lie or presentation are discussed here.

meaning of unstable presentation

Transverse lie

Fetal position is transverse, with the fetal long axis oblique or perpendicular rather than parallel to the maternal long axis. Transverse lie is often accompanied by shoulder presentation, which requires cesarean delivery.

Breech presentation

There are several types of breech presentation.

Frank breech: The fetal hips are flexed, and the knees extended (pike position).

Complete breech: The fetus seems to be sitting with hips and knees flexed.

Single or double footling presentation: One or both legs are completely extended and present before the buttocks.

Types of breech presentations

Breech presentation makes delivery difficult ,primarily because the presenting part is a poor dilating wedge. Having a poor dilating wedge can lead to incomplete cervical dilation, because the presenting part is narrower than the head that follows. The head, which is the part with the largest diameter, can then be trapped during delivery.

Additionally, the trapped fetal head can compress the umbilical cord if the fetal umbilicus is visible at the introitus, particularly in primiparas whose pelvic tissues have not been dilated by previous deliveries. Umbilical cord compression may cause fetal hypoxemia.

meaning of unstable presentation

Predisposing factors for breech presentation include

Preterm labor

Uterine abnormalities

Fetal anomalies

If delivery is vaginal, breech presentation may increase risk of

Umbilical cord prolapse

Birth trauma

Perinatal death

meaning of unstable presentation

Face or brow presentation

In face presentation, the head is hyperextended, and position is designated by the position of the chin (mentum). When the chin is posterior, the head is less likely to rotate and less likely to deliver vaginally, necessitating cesarean delivery.

Brow presentation usually converts spontaneously to vertex or face presentation.

Occiput posterior position

The most common abnormal position is occiput posterior.

The fetal neck is usually somewhat deflexed; thus, a larger diameter of the head must pass through the pelvis.

Progress may arrest in the second phase of labor. Operative vaginal delivery or cesarean delivery is often required.

Position and Presentation of the Fetus

If a fetus is in the occiput posterior position, operative vaginal delivery or cesarean delivery is often required.

In breech presentation, the presenting part is a poor dilating wedge, which can cause the head to be trapped during delivery, often compressing the umbilical cord.

For breech presentation, usually do cesarean delivery at 39 weeks or during labor, but external cephalic version is sometimes successful before labor, usually at 37 or 38 weeks.

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Malpresentation

8-minute read

If you feel your waters break and you have been told that your baby is not in a head-first position, seek medical help immediately .

  • Malpresentation is when your baby is not facing head-first down the birth canal as birth approaches.
  • The most common type of malpresentation is breech — when your baby’s bottom or feet are facing downwards.
  • A procedure called external cephalic version can sometimes turn a breech baby into a head-first position at 36 weeks.
  • Most babies with malpresentation are born by caesarean, but you may be able to have a vaginal birth if your baby is breech.
  • There is a serious risk of cord prolapse if your waters break and your baby is not head-first.

What are presentation and malpresentation?

‘Presentation’ describes how your baby is facing down the birth canal. The ‘presenting part’ is the part of your baby’s body that is against the cervix .

The ideal presentation is head-first, with the crown (top) of the baby’s head against the cervix, with the chin tucked into the baby’s chest. This is called ‘vertex presentation’.

If your baby is in any other position, it’s called ‘malpresentation’. Malpresentation can mean your baby’s face, brow, buttocks, foot, back, shoulder, arms or legs or the umbilical cord are against the cervix.

It’s safest for your baby’s head to come out first. If any other body part goes down the birth canal first, the risks to you and your baby may be higher. Malpresentation increases the chance that you will have a more complex vaginal birth or a caesarean.

If my baby is not head-first, what position could they be in?

Malpresentation is caused by your baby’s position (‘lie’). There are different types of malpresentation.

Breech presentation

This is when your baby is lying with their bottom or feet facing down. Sometimes one foot may enter the birth canal first (called a ‘footling presentation’).

Breech presentation is the most common type of malpresentation.

Face presentation

This is when your baby is head-first but stretching their neck, with their face against the cervix.

Transverse lie

This is when your baby is lying sideways. Their back, shoulders, arms or legs may be the first to enter the birth canal.

Oblique lie

This is when your baby is lying diagonally. No particular part of their body is against the cervix.

Unstable lie

This is when your baby continually changes their position after 36 weeks of pregnancy.

Cord presentation

This is when the umbilical cord is against the cervix, between your baby and the birth canal. It can happen in any situation where your baby’s presenting part is not sitting snugly in your pelvis. It can become an emergency if it leads to cord prolapse (when the cord is born before your baby, potentially reducing placental blood flow to your baby).

What is malposition?

If your baby is lying head-first, the best position for labour is when their face is towards your back.

If your baby is facing the front of your body (posterior position) or facing your side (transverse position) this is called malposition. Transverse position is not the same as transverse lie. A transverse position means your labour may take a bit longer and you might feel more pain in your back. Often your baby will move into a better position before or during labour.

Why might my baby be in the wrong position?

Malpresentation may be caused by:

  • a low-lying placenta
  • too much or too little amniotic fluid
  • many previous pregnancies, making the muscles of the uterus less stable
  • carrying twins or more

Often no cause is found.

Is it likely that my baby will be in the wrong position?

Many babies are in a breech position during pregnancy. They usually turn head-first as pregnancy progresses, and more than 9 in 10 babies in Australia have a vertex presentation (ideal presentation, head-first) at birth.

You are more likely to have a malpresentation if:

  • this is your first baby
  • you are over 40 years old
  • you've had a previous breech baby
  • you go into labour prematurely

How is malpresentation diagnosed?

Malpresentation is normally diagnosed when your doctor or midwife examines you, from 36 weeks of pregnancy. If it’s not clear, it can be confirmed with an ultrasound.

Can my baby’s position be changed?

If you are 36 weeks pregnant , it may be possible to gently turn your baby into a head-first position. This is done by an obstetrician using a technique called external cephalic version (ECV).

Some people try different postures or acupuncture to correct malpresentation, but there isn’t reliable evidence that either of these work.

Will I need a caesarean if my baby has a malpresentation?

Most babies with a malpresentation close to birth are born by caesarean . You may be able to have a vaginal birth with a breech baby, but you will need to go to a hospital that can offer you and your baby specialised care.

If your baby is breech, an elective (planned) caesarean is safer for your baby than a vaginal birth in the short term. However, in the longer term their health will be similar, on average, regardless of how they were born.

A vaginal birth is safer for you than an elective caesarean. However, about 4 in 10 people planning a vaginal breech birth end up needing an emergency caesarean . If this happens to you, the risk of complications will be higher.

Your doctor can talk to you about your options. Whether it’s safe for you to try a vaginal birth will depend on many factors. These include how big your baby is, the position of your baby, the structure of your pelvis and whether you’ve had a caesarean in the past.

What are the risks if I have my baby when it’s not head-first?

If your waters break when your baby is not head-first, there is a risk of cord prolapse. This is an emergency.

Vaginal breech birth

Risks to your baby can include:

  • Erb’s palsy
  • fractures, dislocations or other injuries
  • bleeding in your baby’s brain
  • low Apgar scores
  • their head getting stuck – this is an emergency

Risks to you include:

  • blood loss or blood clots
  • infection in the wound
  • problems with the anaesthetic
  • damage to other organs nearby, such as your bladder
  • a higher chance of problems in future pregnancies
  • a longer recovery time than after a vaginal birth

Risks to your baby include:

  • trouble with breathing — this is temporary
  • getting a small cut during the surgery

Will I have a malpresentation in my future pregnancies?

If you had a malpresentation in one pregnancy, you have a higher chance of it happening again, but it won’t necessarily happen in future pregnancies. If you’re worried, it may help to talk to your doctor or midwife so they can explain what happened.

meaning of unstable presentation

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Last reviewed: July 2022

Related pages

Labour complications.

  • Interventions during labour
  • Giving birth - stages of labour

Breech pregnancy

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When a baby is positioned bottom-down late in pregnancy, this is called the breech position. Find out about 3 main types and safe birthing options.

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Breech Presentation at the End of your Pregnancy

Breech presentation occurs when your baby is lying bottom first or feet first in the uterus (womb) rather than the usual head first position. In early pregnancy, a breech position is very common.

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Presentation and position of baby through pregnancy and at birth

Presentation and position refer to where your baby’s head and body is in relation to your birth canal. Learn why it’s important for labour and birth.

Even if you’re healthy and well prepared for childbirth, there’s always a chance of unexpected problems. Learn more about labour complications.

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Malpresentations and malpositions

Peer reviewed by Dr Laurence Knott Last updated by Dr Colin Tidy, MRCGP Last updated 22 Jun 2021

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Professional Reference articles are designed for health professionals to use. They are written by UK doctors and based on research evidence, UK and European Guidelines. You may find one of our  health articles  more useful.

In this article :

Malpresentation, malposition.

Usually the fetal head engages in the occipito-anterior position (more often left occipito-anterior (LOA) rather than right) and then undergoes a short rotation to be directly occipito-anterior in the mid-cavity. Malpositions are abnormal positions of the vertex of the fetal head relative to the maternal pelvis. Malpresentations are all presentations of the fetus other than vertex.

Obstetrics - the pelvis and head

OBSTETRICS - THE PELVIS AND HEAD

Continue reading below

Predisposing factors to malpresentation include:

Prematurity.

Multiple pregnancy.

Abnormalities of the uterus - eg, fibroids.

Partial septate uterus.

Abnormal fetus.

Placenta praevia.

Primiparity.

Breech presentation

See the separate Breech Presentations article for more detailed discussion.

Breech presentation is the most common malpresentation, with the majority discovered before labour. Breech presentation is much more common in premature labour.

Approximately one third are diagnosed during labour when the fetus can be directly palpated through the cervix.

After 37 weeks, external cephalic version can be attempted whereby an attempt is made to turn the baby manually by manipulating the pregnant mother's abdomen. This reduces the risk of non-cephalic delivery 1 .

Maternal postural techniques have also been tried but there is insufficient evidence to support these 2 .

Many women who have a breech presentation can deliver vaginally. Factors which make this less likely to be successful include 3 :

Hyperextended neck on ultrasound.

High estimated fetal weight (more than 3.8 kg).

Low estimated weight (less than tenth centile).

Footling presentation.

Evidence of antenatal fetal compromise.

Transverse lie 4

When the fetus is positioned with the head on one side of the pelvis and the buttocks in the other (transverse lie), vaginal delivery is impossible.

This requires caesarean section unless it converts or is converted late in pregnancy. The surgeon may be able to rotate the fetus through the wall of the uterus once the abdominal wall has been opened. Otherwise, a transverse uterine incision is needed to gain access to a fetal pole.

Internal podalic version is no longer attempted.

Transverse lie is associated with a risk of cord prolapse of up to 20%.

Occipito-posterior position

This is the most common malposition where the head initially engages normally but then the occiput rotates posteriorly rather than anteriorly. 5.2% of deliveries are persistent occipito-posterior 5 .

The occipito-posterior position results from a poorly flexed vertex. The anterior fontanelle (four radiating sutures) is felt anteriorly. The posterior fontanelle (three radiating sutures) may also be palpable posteriorly.

It may occur because of a flat sacrum, poorly flexed head or weak uterine contractions which may not push the head down into the pelvis with sufficient strength to produce correct rotation.

As occipito-posterior-position pregnancies often result in a long labour, close maternal and fetal monitoring are required. An epidural is often recommended and it is essential that adequate fluids be given to the mother.

The mother may get the urge to push before full dilatation but this must be discouraged. If the head comes into a face-to-pubis position then vaginal delivery is possible as long as there is a reasonable pelvic size. Otherwise, forceps or caesarean section may be required.

Occipito-transverse position

The head initially engages correctly but fails to rotate and remains in a transverse position.

Alternatives for delivery include manual rotation of fetal head using Kielland's forceps, or delivery using vacuum extraction. This is inappropriate if there is any fetal acidosis because of the risk of cerebral haemorrhage.

Therefore, there must be provision for a failure of forceps delivery to be changed immediately to a caesarean. The trial of forceps is therefore often performed in theatre. Some centres prefer to manage by caesarean section without trial of forceps.

Face presentations

Face presents for delivery if there is complete extension of the fetal head.

Face presentation occurs in 1 in 1,000 deliveries 5 .

With adequate pelvic size, and rotation of the head to the mento-anterior position, vaginal delivery should be achieved after a long labour.

Backwards rotation of the head to a mento-posterior position requires a caesarean section.

Brow positions

The fetal head stays between full extension and full flexion so that the biggest diameter (the mento-vertex) presents.

Brow presentation occurs in 0.14% of deliveries 5 .

Brow presentation is usually only diagnosed once labour is well established.

The anterior fontanelle and super orbital ridges are palpable on vaginal examination.

Unless the head flexes, a vaginal delivery is not possible, and a caesarean section is required.

Further reading and references

  • Hofmeyr GJ, Kulier R, West HM ; External cephalic version for breech presentation at term. Cochrane Database Syst Rev. 2015 Apr 1;(4):CD000083. doi: 10.1002/14651858.CD000083.pub3.
  • Hofmeyr GJ, Kulier R ; Cephalic version by postural management for breech presentation. Cochrane Database Syst Rev. 2012 Oct 17;10:CD000051. doi: 10.1002/14651858.CD000051.pub2.
  • Management of Breech Presentation ; Royal College of Obstetricians and Gynaecologists (Mar 2017)
  • Szaboova R, Sankaran S, Harding K, et al ; PLD.23 Management of transverse and unstable lie at term. Arch Dis Child Fetal Neonatal Ed. 2014 Jun;99 Suppl 1:A112-3. doi: 10.1136/archdischild-2014-306576.324.
  • Gardberg M, Leonova Y, Laakkonen E ; Malpresentations - impact on mode of delivery. Acta Obstet Gynecol Scand. 2011 May;90(5):540-2. doi: 10.1111/j.1600-0412.2011.01105.x.

Article history

The information on this page is written and peer reviewed by qualified clinicians.

Next review due: 21 Jun 2026

22 jun 2021 | latest version.

Last updated by

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Shoulder Presentation (Transverse or Oblique lie)

  • The longitudinal axis of the foetus does not coincide with that of the mother.
  • These are the most hazardous malpresentations due to mechanical difficulties that occur during labour .
  • The oblique lie which is deviation of the head or the breech to one iliac fossa, is less hazardous as correction to a longitudinal lie is more feasible.

3-4% during the last quarter of pregnancy but 0.5% by the time labour commences.

Factors that

  • change the shape of pelvis, uterus or foetus,
  • allow free mobility of the foetus or
  • Contracted pelvis.           
  • Lax abdominal wall.
  • Uterine causes as bicornuate, subseptate and fibroid uterus.
  • Pelvic masses as ovarian tumours.
  • Multiple pregnancy.     
  • Polyhydramnios.    
  • Placenta praevia.           
  • Prematurity.
  • Intrauterine foetal death.

The scapula is the denominator

  • Left scapulo-anterior.
  • Right scapulo-anterior.
  • Right scapulo-posterior.
  • Left scapulo-posterior.

Scapulo-anterior are more common than scapulo-posterior as the concavity of the front of the foetus tends to fit with the convexity of the maternal spines.

During pregnancy

  • The abdomen is broader from side to side.
  • Fundal level: lower than that corresponds to the period of amenorrhoea.
  • Fundal grip: The fundus feels empty.
  • Umbilical grip: The head is felt on one side while the breech one the other. In transverse lie, they are at the same level, while in oblique lie one pole, usually the head as it is heavier, is in a lower level i.e. in the iliac fossa.
  • First pelvic grip: Empty lower uterine segment.
  • FHS are best heard on one side of the umbilicus towards the foetal head.
  • Confirms the diagnosis and may identify the cause as multiple pregnancy or placenta praevia.

During labour

In addition to the previous findings, vaginal examination reveals:

  • The presenting part is high.
  • Membranes are bulging.
  • Premature rupture of membranes with prolapsed arm or cord is common. The dorsum of the supinated hand points to the foetal back and the thumb towards the head. The right hand of the foetus can be shacked, correctly by the right hand of the obstetrician and the left hand by the left one.
  • When the cervix is sufficiently dilated particularly after rupture of the membranes, the scapula, acromion, clavicle, ribs and axilla can be felt.

Mechanism of Labour

As a rule no mechanism of labour should be anticipated in transverse lie and labour is obstructed.

If a patient is allowed to progress in labour with a neglected or unrecognized transverse lie, one of the following may occur:

  • This is the usual and most common outcome.
  • The lower uterine segment thins and ultimately ruptures.
  • The foetus becomes hyperflexed, placental circulation is impaired, cord is prolapsed and compressed leading to foetal asphyxia and death.
  • Rarely the foetal lie may be corrected by the splinting effect of the contracted uterine muscles so that the head presents.
  • Rarely, by similar process the breech may come to present.
  • Very rarely, if the foetus is very small or dead and macerated, the shoulder may be forced through the pelvis followed by the head and trunk.
  • Very rarely, the head is retained above the pelvic brim, the neck greatly elongates, the breech descends followed by the trunk and the after -coming head, i.e. spontaneous version occurs in the pelvic cavity.

External cephalic version

Can be done in late pregnancy or even early in labour if the membranes are intact and vaginal delivery is feasible. In early labour, if version succeeded apply abdominal binder and rupture the membranes as if there are uterine contractions.

Internal podalic version

It is mainly indicated in 2nd twin of transverse lie and followed by breech extraction.

Prerequisites:

  • General or epidural anaesthesia.
  • Fully dilated cervix.
  • Intact membranes or just ruptured.

Caesarean section

  • It is the best and safest method of management in nearly all cases of persistent transverse or oblique lie even if the baby is dead.
  • As rupture of membranes carries the risk of cord prolapse, an elective caesarean section should be planned before labour commences.

Neglected (Impacted) shoulder

Clinical picture (impending rupture uterus)

  • Exhaustion and distress of the mother.
  • Shoulder is impacted may be with prolapsed arm and / or cord.
  • Membranes are ruptured since a time.
  • Liquor is drained.
  • The uterus is tonically contracted.
  • The foetus is severely distressed or dead.
  • Caesarean section is the safest procedure even if the baby is dead. A classical or low vertical incision in the uterus facilitates extraction of the foetus as a breech in such a condition.
  • Any other manipulations will lead eventually to rupture uterus so they are contraindicated.

UNSTABLE LIE

A foetus which changes its lie frequently from transverse to oblique to longitudinal.

  • Polyhydramnios.
  • Prematurity and IUFD.
  • Contracted pelvis.
  • Placenta praevia.
  • Pelvic tumours. 
  • Multiparae with a lax uterus and abdominal wall.
  • Can be done whenever the woman is examined but in majority of cases it will recur so it is better to defer it until full term (37-40 weeks).
  • After correcting the foetal lie to longitudinal, apply an abdominal binder, start oxytocin infusion and do amniotomy when the uterine contractions started and the presenting part is well settled into the pelvic brim.
  • Failure of external version .
  • Some do it selectively in cases discovered after 40 weeks’ gestation.
  • Shoulder dystocia : Guidelines, reviews

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Malpresentation and Malposition of the Fetus

A malpresentation or malposition of the fetus is when the fetus is in any abnormal position, other than vertex (head down) with the occiput anterior or posterior.

The following are considered malpresentations or malpositions:

Unstable lie

  • Transverse presentation
  • Oblique presentation

Face presentation

Brow presentation

Shoulder presentation

High head at term

  • Prolapsed arm

The cause of a malpresentation can often not be clearly identified but it can be associated with the following:

  • Preterm pregnancy
  • Uterine anomalies
  • Pelvic tumors eg f ibroids
  • Placenta previa
  • Grandmultiparty
  • Contracted maternal pelvis
  • Multiple gestation
  • Too much amniotic fluyid (polyhydramnios)
  • Short umbilical cord
  • Fetal anomalies (e.g. anencephaly, hydro-cephalus)
  • Abnormal fetal motor ability

There is an increased risk of neonatal and maternal complications associated with a malpresentation including neonatal and maternal trauma. If delivery is indicated, doing a cesarean delivery can significantly decrease the risk of complications.

Transverse lie

Oblique lie

In most cases of a normal vertex (head down) presentation, the baby's head is flexed with the chin close to the baby's chest. In these cases, the presenting part is the occiput, the posterior part of the baby's head. If the baby's head is more but not completekly extended then the baby's brow presents towards the vagina. A brow presentation is rare, maybe happening in about 1 in 2,000 births, more likely in pwomen with their second or subsequent births. A baby with a brow presentation can only deliver vaginally if the head flexes or extends.

Prolapsed arm 

meaning of unstable presentation

Fetal Presentation, Position, and Lie (Including Breech Presentation)

  • Variations in Fetal Position and Presentation |

During pregnancy, the fetus can be positioned in many different ways inside the mother's uterus. The fetus may be head up or down or facing the mother's back or front. At first, the fetus can move around easily or shift position as the mother moves. Toward the end of the pregnancy the fetus is larger, has less room to move, and stays in one position. How the fetus is positioned has an important effect on delivery and, for certain positions, a cesarean delivery is necessary. There are medical terms that describe precisely how the fetus is positioned, and identifying the fetal position helps doctors to anticipate potential difficulties during labor and delivery.

Presentation refers to the part of the fetus’s body that leads the way out through the birth canal (called the presenting part). Usually, the head leads the way, but sometimes the buttocks (breech presentation), shoulder, or face leads the way.

Position refers to whether the fetus is facing backward (occiput anterior) or forward (occiput posterior). The occiput is a bone at the back of the baby's head. Therefore, facing backward is called occiput anterior (facing the mother’s back and facing down when the mother lies on her back). Facing forward is called occiput posterior (facing toward the mother's pubic bone and facing up when the mother lies on her back).

Lie refers to the angle of the fetus in relation to the mother and the uterus. Up-and-down (with the baby's spine parallel to mother's spine, called longitudinal) is normal, but sometimes the lie is sideways (transverse) or at an angle (oblique).

For these aspects of fetal positioning, the combination that is the most common, safest, and easiest for the mother to deliver is the following:

Head first (called vertex or cephalic presentation)

Facing backward (occiput anterior position)

Spine parallel to mother's spine (longitudinal lie)

Neck bent forward with chin tucked

Arms folded across the chest

If the fetus is in a different position, lie, or presentation, labor may be more difficult, and a normal vaginal delivery may not be possible.

Variations in fetal presentation, position, or lie may occur when

The fetus is too large for the mother's pelvis (fetopelvic disproportion).

The uterus is abnormally shaped or contains growths such as fibroids .

The fetus has a birth defect .

There is more than one fetus (multiple gestation).

meaning of unstable presentation

Position and Presentation of the Fetus

Variations in fetal position and presentation.

Some variations in position and presentation that make delivery difficult occur frequently.

Occiput posterior position

In occiput posterior position (sometimes called sunny-side up), the fetus is head first (vertex presentation) but is facing forward (toward the mother's pubic bone—that is, facing up when the mother lies on her back). This is a very common position that is not abnormal, but it makes delivery more difficult than when the fetus is in the occiput anterior position (facing toward the mother's spine—that is facing down when the mother lies on her back).

When a fetus faces up, the neck is often straightened rather than bent,which requires more room for the head to pass through the birth canal. Delivery assisted by a vacuum device or forceps or cesarean delivery may be necessary.

Breech presentation

In breech presentation, the baby's buttocks or sometimes the feet are positioned to deliver first (before the head).

When delivered vaginally, babies that present buttocks first are more at risk of injury or even death than those that present head first.

The reason for the risks to babies in breech presentation is that the baby's hips and buttocks are not as wide as the head. Therefore, when the hips and buttocks pass through the cervix first, the passageway may not be wide enough for the head to pass through. In addition, when the head follows the buttocks, the neck may be bent slightly backwards. The neck being bent backward increases the width required for delivery as compared to when the head is angled forward with the chin tucked, which is the position that is easiest for delivery. Thus, the baby’s body may be delivered and then the head may get caught and not be able to pass through the birth canal. When the baby’s head is caught, this puts pressure on the umbilical cord in the birth canal, so that very little oxygen can reach the baby. Brain damage due to lack of oxygen is more common among breech babies than among those presenting head first.

In a first delivery, these problems may occur more frequently because a woman’s tissues have not been stretched by previous deliveries. Because of risk of injury or even death to the baby, cesarean delivery is preferred when the fetus is in breech presentation, unless the doctor is very experienced with and skilled at delivering breech babies or there is not an adequate facility or equipment to safely perform a cesarean delivery.

Breech presentation is more likely to occur in the following circumstances:

Labor starts too soon (preterm labor).

The uterus is abnormally shaped or contains abnormal growths such as fibroids .

Other presentations

In face presentation, the baby's neck arches back so that the face presents first rather than the top of the head.

In brow presentation, the neck is moderately arched so that the brow presents first.

Usually, fetuses do not stay in a face or brow presentation. These presentations often change to a vertex (top of the head) presentation before or during labor. If they do not, a cesarean delivery is usually recommended.

In transverse lie, the fetus lies horizontally across the birth canal and presents shoulder first. A cesarean delivery is done, unless the fetus is the second in a set of twins. In such a case, the fetus may be turned to be delivered through the vagina.

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  • PLD.23 Management of transverse and unstable lie at term
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  • R Szaboova ,
  • S Sankaran ,
  • K Harding ,
  • King’s Health Partners, London, UK

Aims To determine current practice and outcomes in women admitted to antenatal ward with diagnosis of transverse or unstable lie.

Background Fetal lie (other than longitudinal) at term may predispose to prolapse of cord or fetal arm and uterine rupture. Local guidelines recommend admission at 37+0 (RCOG guidelines after 37+6 weeks) but give no specific recommendations regarding further management.

Methods A retrospective study was conducted at St Thomas’ Hospital, London from 2009–2012 of all women admitted with unstable/transverse lie. The diagnosis was based on ultrasound examination. Women with placenta praevia and non-singleton deliveries were excluded.

Results Study included 198 cases of unstable/transverse lie. 58% were admitted before 38 weeks. The average length of admission was 7 days (IQR 4–11). There were no cases of cord prolapse or need for an immediate caesarean section from the antenatal ward. 73% of women had a caesarean section at a median gestation of 39+1 weeks (IQR 38+4 – 40+2) although almost half of these (41%) had a cephalic presentation at the time of elective caesarean sections. None of these had an absolute indication for Caesarean section.

Discussion and conclusions The diagnosis of unstable/transverse lie leads to a prolonged inpatient stay and a high Caesarean section rate. From our study and the evidence from the available literature, we recommend delaying admission until at least 38 weeks and awaiting spontaneous version. Future research should focus on the safety of outpatient management with consideration of utilising techniques such as cervical length and fetal fibronectin.

https://doi.org/10.1136/archdischild-2014-306576.324

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  • Published: 06 August 2019

Is this patient really “(un)stable”? How to describe cardiovascular dynamics in critically ill patients

  • Jean-Louis Vincent   ORCID: orcid.org/0000-0001-6011-6951 1 ,
  • Maurizio Cecconi 2 &
  • Bernd Saugel 3  

Critical Care volume  23 , Article number:  272 ( 2019 ) Cite this article

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Earlier this week during rounds in the intensive care unit, a resident reported, “Mr S. became hemodynamically unstable so we had to give norepinephrine.” Later, another resident described a patient with acute respiratory distress syndrome who had been on renal replacement therapy for the last 36 h as being, “hemodynamically stable under 1 μg/kg/min of norepinephrine.” This led us to reflect on the meanings of these two words—“stable” and “unstable”—when describing cardiovascular dynamics in critically ill patients.

The terms hemodynamically “stable” and “unstable” are used frequently but what do they actually mean? And are they appropriate or even correct? Can a critically ill patient ever really be accurately described as being stable or unstable? A stable condition can be defined as a situation that does not change substantially over time. But surely all critically ill patients are per se un stable as, by the very nature of being critically ill, their physiological variables—including cardiovascular dynamics—change frequently over time [ 1 ]. Although vital signs can appear stable when a patient is receiving organ support, the patient is still critically ill. Terminology in such patients needs to be precise, and vague descriptive terms should be avoided. Indeed, there are no generally accepted and uniform definitions of the conditions stable and unstable, and the same patient may be classified as stable or unstable by different doctors and nurses depending on their clinical judgment, experience, and knowledge of the patient’s clinical course. In Fig.  1 , we propose some clinical scenarios that demonstrate these problems with the use of the words “stable” and “unstable” when describing cardiovascular dynamics in critically ill patients.

figure 1

What is hemodynamic (in)stability

So, how should we describe these patients? To the first resident, we suggested that Mr. S. who had become “hemodynamically unstable” had actually developed circulatory shock and that this was the preferred term. To further describe the cardiovascular dynamics in this and similar patients, available objective criteria (blood pressure, cardiac output, rate of vasopressor or inotrope) should be used.

For the second resident, the problem is perhaps more related to interpretation than definition. The word “stable” often has positive connotations when used to refer to patient condition. When the resident described his patient as “being stable,” everyone agreed, knowing that this meant there had been no acute change in the patient’s condition or treatment. In fact, the patient still had profound circulatory shock. Using the word “stable” in such patients may even create a false sense of security for the care team, such that they begin to accept the critical state of the patient as “normal” and lessen efforts to try and resolve the serious condition. Additionally in this case, when the relatives called anxiously to get some news and the nurse said “the situation is stable,” this gave them the impression that their loved one was not getting worse, thus offering them some hope of recovery. Without further more detailed explanation, relatives may not understand that being stable in such critical conditions actually means the patient is not getting better and his/her chances of a positive outcome are likely getting worse. Indeed, the duration of shock is an important prognostic factor [ 2 , 3 ].

Although widely used among physicians and frequently present in the literature, the words “stable” and “unstable” to describe cardiovascular dynamics in critically ill patients can have different meanings to different people and in different situations, making them confusing word choices that should be avoided. We must be careful and precise with our choice of words to colleagues, patients, and families and avoid vague terms that could be misinterpreted. The word “stable” should not be used to describe a condition that remains critical, and “hemodynamic instability” should be described using objective criteria such as blood pressure, cardiac output, or vasopressor dose.

Availability of data and materials

Not applicable.

Frost P, Wise MP. Recognition and early management of the critically ill ward patient. Br J Hosp Med (Lond). 2007;68:M180–3.

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Vincent JL, Nielsen ND, Shapiro NI, et al. Mean arterial pressure and mortality in patients with distributive shock: a retrospective analysis of the MIMIC-III database. Ann Intensive Care. 2018;8:107.

Maheshwari K, Nathanson BH, Munson SH, et al. The relationship between ICU hypotension and in-hospital mortality and morbidity in septic patients. Intensive Care Med. 2018;44:857–67.

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Acknowledgements

Author information, authors and affiliations.

Department of Intensive Care, Erasme Hospital, Université libre de Bruxelles, 1170, Brussels, Belgium

Jean-Louis Vincent

Department of Anesthesia and Intensive Care Units, Humanitas Research Hospital, 20089, Milan, Italy

Maurizio Cecconi

Department of Anesthesiology, Center of Anesthesiology and Intensive Care Medicine, University Medical Center Hamburg-Eppendorf, 20246, Hamburg, Germany

Bernd Saugel

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JLV wrote the first draft. MC and BS critically revised the content. All authors read and approved the final manuscript before submission.

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Correspondence to Jean-Louis Vincent .

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Vincent, JL., Cecconi, M. & Saugel, B. Is this patient really “(un)stable”? How to describe cardiovascular dynamics in critically ill patients. Crit Care 23 , 272 (2019). https://doi.org/10.1186/s13054-019-2551-1

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Critical Care

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meaning of unstable presentation

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COMMENTS

  1. Abnormal Fetal lie, Malpresentation and Malposition

    Lie - the relationship between the long axis of the fetus and the mother. Presentation - the fetal part that first enters the maternal pelvis. Position - the position of the fetal head as it exits the birth canal. Other positions include occipito-posterior and occipito-transverse. Note: Breech presentation is the most common ...

  2. Fetal Presentation, Position, and Lie (Including Breech Presentation

    In face presentation, the baby's neck arches back so that the face presents first rather than the top of the head.. In brow presentation, the neck is moderately arched so that the brow presents first.. Usually, fetuses do not stay in a face or brow presentation. These presentations often change to a vertex (top of the head) presentation before or during labor.

  3. Abnormal Lie/Presentation

    In cephalic presentation in a well-flexed fetus, the occiput is the point of direction. The fetal position refers to the location of the point of direction with reference to the four quadrants of the maternal outlet as viewed by the examiner. Thus, position may be right or left as well as anterior or posterior. Unstable lie

  4. Fetal Presentation, Position, and Lie (Including Breech Presentation

    Toward the end of pregnancy, the fetus moves into position for delivery. Normally, the presentation is vertex (head first), and the position is occiput anterior (facing toward the pregnant patient's spine) with the face and body angled to one side and the neck flexed. Abnormal presentations include face, brow, breech, and shoulder.

  5. What is malpresentation?

    Malpresentation can mean your baby's face, brow, buttocks, foot, back, shoulder, arms or legs or the umbilical cord are against the cervix. It's safest for your baby's head to come out first. If any other body part goes down the birth canal first, the risks to you and your baby may be higher. Malpresentation increases the chance that you ...

  6. Abnormal Fetal Lie and Presentation

    Fetal presentation is a reference to the part of the fetus that is overlying the maternal pelvic inlet. The most common relationship between fetus and mother is the longitudinal lie, cephalic presentation. A breech fetus also is a longitudinal lie, with the fetal buttocks as the presenting part.

  7. Malpresentations and Malpositions Information

    Breech presentation is the most common malpresentation, with the majority discovered before labour. ... Szaboova R, Sankaran S, Harding K, et al; PLD.23 Management of transverse and unstable lie at term. Arch Dis Child Fetal Neonatal Ed. 2014 Jun;99 Suppl 1:A112-3. doi: 10.1136/archdischild-2014-306576.324.

  8. Shoulder Presentation and unstable lie

    Shoulder Presentation (Transverse or Oblique lie) Definition. The longitudinal axis of the foetus does not coincide with that of the mother. These are the most hazardous malpresentations due to mechanical difficulties that occur during labour . The oblique lie which is deviation of the head or the breech to one iliac fossa, is less hazardous as ...

  9. Malpresentation and Malposition of the Fetus

    Unstable lie Breech Transverse lie Oblique lie Face presentation Brow presentation . In most cases of a normal vertex (head down) presentation, the baby's head is flexed with the chin close to the baby's chest. In these cases, the presenting part is the occiput, the posterior part of the baby's head.

  10. Breech Presentation, Unstable Lie, Malpresentation, and Malpositions

    The concepts of breech presentation, unstable lie, malpresentations, and malposition have not changed for many years but the diagnostic tools and management options change periodically as new management techniques are developed and the evidence for their use improves. Early in pregnancy the position, presentation, and lie of a fetus are ...

  11. Presentation (obstetrics)

    Definition: Relationship between the longitudinal axis of fetus and mother: longitudinal (resulting in either cephalic or breech presentation) oblique (unstable, will eventually become either transverse or longitudinal) transverse (resulting in shoulder presentation) back up; back down (indication for vertical uterine incision during cesarean ...

  12. The Trusted Provider of Medical Information since 1899

    The Trusted Provider of Medical Information since 1899

  13. PDF Management of an Unstable Lie at Term

    An unstable lie is the term given to a fetus that continues to change its position and does not maintain a longitudinal lie at term (≥ 37 weeks). ... A fetus that does not maintain a cephalic presentation and longitudinal lie at term may reduce the possibility of a normal vaginal delivery. Women with an unstable lie or

  14. PDF Abnormalities of Lie / Presentation

    3. Perform a CTG for 20 minutes, or cease earlier if the CTG meets the definition of normal prior to 20 minutes. 4. Check a formal ultrasound has been performed within 24 hours of the procedure. Ensure the presentation is still breech by use of the real time scanner. 5. Confirm the Medical Officer performing the procedure is available in 30 minutes

  15. Fetal malpresentation

    Breech presentation is the most commonly encountered malpresentation. Since publication of the Term Breech Trial that showed benefits for the fetus in undertaking caesarean section, there has been a large shift in practice. Nonetheless the fact remains that most babies will not be compromised by planning a vaginal birth, and maternal requests for vaginal delivery are not unreasonable. Many ...

  16. Management of malposition and malpresentation in labour

    A malpresentation is diagnosed when any part of the baby is presenting to the maternal pelvis other than the vertex of the fetal head. A malposition is diagnosed when the fetal head is in any position other than occipito-anterior (OA) flexed vertex. Both malpresentation and malposition are associated with prolonged or obstructed labour, fetal and maternal morbidity, and potential mortality, if ...

  17. Management of unstable and non-longitudinal lie at term in contemporary

    We have observed that there is significant variation in practice and a lack of published evidence on the management of unstable/transverse/oblique lie at term in the modern obstetric practice. The RCOG Green-top Guideline No.50 recommends elective admission after 37 + 0 weeks gestation and immediate admission with signs of labour or rupture of membranes (SROM) to reduce risk of cord prolapse [1].

  18. What Is a Fetal Lie and Its Types?

    A normal fetal lie is an ideal position for labor and baby delivery in which the baby is head-down with the chin tucked into its chest. The back of the head is positioned so that it is ready to enter the pelvis. The fetus faces the mother's back, called cephalic presentation, and the babies mostly settle in this position by 32 to 36 weeks of ...

  19. PLD.23 Management of transverse and unstable lie at term

    Aims To determine current practice and outcomes in women admitted to antenatal ward with diagnosis of transverse or unstable lie. Background Fetal lie (other than longitudinal) at term may predispose to prolapse of cord or fetal arm and uterine rupture. Local guidelines recommend admission at 37+0 (RCOG guidelines after 37+6 weeks) but give no specific recommendations regarding further management.

  20. Unstable Angina

    Unstable angina, one of several acute coronary syndromes, causes unexpected chest pain, and usually occurs while resting.The most common cause is reduced blood flow to the heart muscle because the coronary arteries are narrowed by fatty buildups (atherosclerosis) that can rupture, causing injury to the coronary blood vessel.This results in blood clotting, which blocks blood flow to the heart ...

  21. Is this patient really "(un)stable"? How to describe cardiovascular

    Although widely used among physicians and frequently present in the literature, the words "stable" and "unstable" to describe cardiovascular dynamics in critically ill patients can have different meanings to different people and in different situations, making them confusing word choices that should be avoided.

  22. PDF Focus on Clinical Presentation (00177519)

    The documentation should state "evolving clinical presentation with changing characteristics" and describe what has been changing and what will be monitored, such as fluctuating pain, swelling, changes in vital signs, etc., to support an "evolving" clinical presentation statement. UNSTABLE and unpredictable characteristics are evident ...

  23. Unleashing Engagement: 4 Ways To Reimagine Stale Presentations

    1. Less Talking, More Listening. Shifting your mindset from "presenting" to "listening" is the key to hosting effective virtual meetings. No matter their size, online meetings that put attendees ...

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    President Joe Biden's commencement address at Morehouse College saw some peaceful protests from students and faculty but no major disruptions.

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    OpenAI, in partnership with Microsoft, announces GPT-4o, a groundbreaking multimodal model for text, vision, and audio capabilities. Learn more.

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    Establishing reliable and effective prediction models is a major research priority for air quality parameter monitoring and prediction and is utilized extensively in numerous fields. The sample dataset of air quality metrics often established has missing data and outliers because of certain uncontrollable causes. A broad learning system based on a semi-supervised mechanism is built to address ...

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    The pseudo-spin symmetry (PSS) provides an important angle to understand nuclear microscopic structure and the novel phenomena found in unstable nuclei. The relativistic Hartree-Fock (RHF) theory, that takes the important degrees of freedom associated with the π-meson and ρ-tensor (ρ-T) couplings into account, provides an appropriate description of the PSS restoration in realistic nuclei ...