Breech Delivery Clinical Presentation
- Author: Andrew D Jenis, MD; Chief Editor: Ronald M Ramus, MD more...
History
- Factors that increase likelihood of breech delivery include the following:
- Preterm delivery
- Increased parity
- Multiple gestations
- Previous breech delivery
- Pelvic tumors
- Older maternal age[3]
Physical
- Leopold maneuvers: With the first maneuver, the hard fetal head can be palpated at the uterine fundus.
- Auscultation: Heart sounds can be heard above the umbilicus.
- Vaginal examination
- In frank breech presentations, the ischial tuberosities, sacrum, anus, and/or genitals may be palpated. In addition, meconium staining of the examiner's digit may occur.
- In complete breech presentations, the feet or buttocks of the fetus can be palpated.
- In incomplete breech presentations, one or both of the feet/knees may be palpated.
- During frank breech delivery, the following conditions make vaginal delivery less risky:
- Favorable pelvis - Gynecoid (ie, round) or anthropoid (ie, elliptical)
- Fetal weight less than 3600 g - The larger the fetus, the larger the head, as well as other noncompressible body parts, thereby leading to an increased risk of fetal hypoxia and birth trauma
- Complete dilation and effacement of the cervix - Provides the head a better chance to pass through the pelvis
- Availability of skilled obstetrician, neonatal resuscitation equipment, and anesthesia
- The following conditions are unfavorable for delivery:
- Fetal weight more than 3600 g
- Unfavorable pelvis - Breech delivery does not allow sufficient time for molding of the fetal head; thus, a platypelloid (ie, anteroposterior flat) or android (ie, heart-shaped) pelvis decreases the fetal head's ability to navigate the maternal pelvis.
- Hyperextension of the head - Increases risk of cervical spine injury
- Footlings - Incidence of umbilical cord prolapse increases with coiling of the umbilical cord around the legs of the fetus
Causes
- Risk factors for breech presentation at delivery include the following:
- Preterm gestational age: Prior to the onset of labor, the fetus typically turns into a cephalic presentation. If labor occurs abruptly or unexpectedly (eg, following trauma), the fetus may not have yet shifted position.
- Increased maternal parity may cause stretching or laxity of the uterus, predisposing the fetus to breech deliveries.
- Multiple fetuses: As a result of limited space in the uterus, fetuses may position themselves head to foot.
- Hydramnios, ie, too much amniotic fluid, may allow the fetus too much movement.
- Oligohydramnios, ie, too little amniotic fluid, may impede the final shift of the fetus into a cephalic presentation.
- Placenta previa, ie, placental implantation over the cervical os, allows the fetus too much space for movement within the uterus.
- Hydrocephalus, ie, enlarged head in the fetus, makes it more difficult for the fetus to make shift to cephalic presentation prior to the onset of labor.
- Previous breech deliveries may increase likelihood of another one secondary to an anatomical anomaly.
- Uterine anomalies include uterine scarring from a previous cesarean section, bicornuate uterus, or a septate uterus.
- Pelvic tumors may impede fetal movement and trap the fetus in a breech presentation.
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| Gestational Age, Weeks | Breech, % |
| 21-24 | 33 |
| 25-28 | 28 |
| 29-32 | 14 |
| 33-36 | 9 |
| 37-40 | 3-4 |

