Macrosomic neonates are at increased risk for birth trauma, particularly during difficult or operative vaginal deliveries. Match each characteristic clinical presentation observed during the newborn physical examination with its most likely traumatic etiology.
- Adducted and internally rotated right arm with forearm pronation; absent Moro reflex but intact grasp on the affected side.Upper brachial plexus trunk injury (C5-C6)
- Claw-like posturing of the left hand with an absent grasp reflex, accompanied by ipsilateral ptosis and miosis.Lower brachial plexus trunk injury (C8-T1)
- Crepitus and palpable bony step-off over the anterior shoulder; decreased spontaneous arm movement but normal reflexes.Neonatal clavicular fracture
- Respiratory distress with asymmetric chest wall expansion and paradoxical abdominal movement during inspiration.Phrenic nerve injury (C3-C5)
Answer
The presentations match as follows: 'waiter's tip' posture matches upper trunk injury (Erb palsy), claw hand with Horner syndrome matches lower trunk injury (Klumpke palsy), shoulder crepitus matches clavicular fracture, and asymmetric breathing matches phrenic nerve injury.
Each clinical presentation is a classic manifestation of a specific birth trauma. Accurate diagnosis requires localizing the neurological deficit (proximal vs. distal muscles) and identifying associated structural findings (crepitus, sympathetic deficit, or diaphragmatic paralysis).
Step-by-Step Solution
Key Concept
Differentiating neonatal birth traumas based on characteristic physical examination findings and neurological localization.