# Clinical Cases: Labor and Delivery

## Case 1: Shoulder Dystocia

### Clinical Image
![Shoulder Dystocia](case_01_image.jpg)
*Source: [Wikipedia - Shoulder dystocia](https://en.wikipedia.org/wiki/Shoulder_dystocia) - CC BY-SA 4.0*

### Case Presentation
A 34-year-old G2P1 woman at 40 weeks gestation presents in active labor. Her first pregnancy resulted in a vaginal delivery of a 3.9 kg infant complicated by a prolonged second stage. She has gestational diabetes controlled with diet. Current estimated fetal weight by ultrasound is 4.2 kg. Labor progresses normally and she reaches complete cervical dilation. After 90 minutes of pushing, the fetal head delivers but then retracts against the perineum (the "turtle sign"). The anterior shoulder fails to deliver with routine maneuvers. Shoulder dystocia is recognized immediately. The McRoberts maneuver is performed (hyperflexion of maternal thighs against the abdomen), and suprapubic pressure is applied by an assistant. The anterior shoulder does not deliver. The provider performs the Woods corkscrew maneuver (rotating the posterior shoulder anteriorly). The infant is finally delivered with delivery of the posterior arm. Total head-to-body delivery time is 75 seconds. The infant weighs 4.4 kg and has initial left arm flaccidity with absent Moro reflex on the left. Apgar scores are 6 at 1 minute and 8 at 5 minutes. Pediatric evaluation reveals Erb's palsy (C5-C6 brachial plexus injury) presenting with the characteristic "waiter's tip" posture. Physical therapy is initiated. At 3 months of age, the infant shows significant recovery of arm function.

### Key Learning Points
- Shoulder dystocia occurs when the fetal anterior shoulder impacts the maternal pubic symphysis after delivery of the head; risk factors include macrosomia, gestational diabetes, prior shoulder dystocia, and prolonged second stage
- The "turtle sign" (retraction of the delivered fetal head against the perineum) is the classic indicator of shoulder dystocia
- McRoberts maneuver (hyperflexion of maternal thighs) with suprapubic pressure is the first-line intervention; additional maneuvers include Woods corkscrew and delivery of the posterior arm
- Erb's palsy (C5-C6 injury causing "waiter's tip" posture) is a potential complication; most cases recover spontaneously within the first year

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## Case 2: Non-Reassuring Fetal Heart Rate Tracing

### Clinical Image
![Fetal Heart Rate Monitoring](case_02_image.jpg)
*Source: [Wikipedia - Cardiotocography](https://en.wikipedia.org/wiki/Cardiotocography) - CC BY-SA 3.0*

### Case Presentation
A 29-year-old G1P0 at 39 weeks gestation is admitted for labor induction due to gestational hypertension. Cervical ripening with misoprostol is performed, followed by oxytocin augmentation. After 8 hours, she is 5 cm dilated with ruptured membranes. Continuous fetal heart rate (FHR) monitoring shows a baseline of 145 bpm with moderate variability. Suddenly, repetitive late decelerations develop, with FHR dropping to 100 bpm starting 20-30 seconds after the peak of each contraction and not returning to baseline until well after the contraction ends. Variability becomes minimal. The provider recognizes this as a Category III FHR tracing indicating uteroplacental insufficiency. Intrauterine resuscitation is initiated: the patient is repositioned to left lateral decubitus, oxytocin is discontinued, IV fluid bolus is given, and oxygen is administered via face mask. Despite these measures, late decelerations persist with minimal variability. The decision is made for emergent cesarean delivery. A male infant is delivered with Apgar scores of 4 at 1 minute and 7 at 5 minutes, requiring positive pressure ventilation initially. Umbilical cord arterial pH is 7.15. The infant recovers well without evidence of hypoxic-ischemic encephalopathy.

### Key Learning Points
- Late decelerations (onset after contraction peak, nadir after peak, gradual return to baseline) indicate uteroplacental insufficiency and fetal hypoxia
- Category III FHR tracings (absent variability with recurrent late or variable decelerations, bradycardia, or sinusoidal pattern) require immediate evaluation and intervention
- Intrauterine resuscitation includes position change, stopping oxytocin, IV fluids, oxygen, and amnioinfusion if indicated for variable decelerations
- If resuscitative measures fail, expeditious delivery is indicated to prevent fetal acidemia and hypoxic-ischemic injury

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## Case 3: Umbilical Cord Prolapse

### Clinical Image
![Umbilical Cord Prolapse](case_03_image.jpg)
*Source: [Wikipedia - Umbilical cord prolapse](https://en.wikipedia.org/wiki/Umbilical_cord_prolapse) - CC BY-SA 4.0*

### Case Presentation
A 31-year-old G3P2 at 38 weeks gestation presents with spontaneous rupture of membranes and a large gush of clear fluid at home. She has polyhydramnios noted on recent ultrasound, and the fetus is in an unstable lie (alternating transverse and breech presentations). Upon arrival at labor and delivery, the presenting part is not engaged (-3 station). During the admission examination, a pulsating loop of umbilical cord is palpated in the vagina ahead of the fetal presenting part. Fetal heart rate shows severe prolonged bradycardia at 60 bpm. Umbilical cord prolapse is diagnosed. The examining hand is kept in place to elevate the presenting part off the compressed cord. The patient is placed in knee-chest position and the bladder is filled with saline via Foley catheter to elevate the presenting part. The patient is rushed to the operating room for emergent cesarean delivery. The examiner's hand is maintained in position throughout transport and until abdominal delivery is accomplished, a total of 8 minutes from diagnosis to delivery. A vigorous infant is delivered with Apgar scores of 5 at 1 minute and 8 at 5 minutes. The infant does well without complications.

### Key Learning Points
- Umbilical cord prolapse is an obstetric emergency where the cord descends through the cervix alongside or ahead of the presenting part, leading to cord compression and fetal hypoxia
- Risk factors include polyhydramnios, malpresentation (breech, transverse), unengaged presenting part, premature rupture of membranes, and multiparity
- Management requires immediate elevation of the presenting part off the cord (manually or by filling the bladder) and emergent delivery, usually by cesarean
- Diagnosis to delivery time is critical; the examiner's hand should remain in place elevating the presenting part until abdominal delivery is achieved