Shoulder dystocia without versus with brachial plexus injury: a case-control study

Area of Science:

• Obstetrics
• Neonatal outcomes
• Birth injury

Background:

• Shoulder dystocia is a common obstetric emergency.
• Brachial plexus injury (BPI) is a potential complication of shoulder dystocia.
• Identifying predictive factors for BPI is crucial for risk assessment and management.

Purpose of the Study:

• To identify clinical factors that distinguish shoulder dystocia cases complicated by brachial plexus injury (BPI) from those without BPI.
• To determine if antepartum or intrapartum variables can predict the occurrence of BPI during shoulder dystocia.

Main Methods:

• A case-control study design was employed, utilizing data from an established shoulder dystocia database.
• Cases of shoulder dystocia with BPI were matched 1:1 with control cases of shoulder dystocia without BPI.
• Statistical analysis included calculation of odds ratios (OR) and 95% confidence intervals (CI).

Main Results:

• The study analyzed 46 cases of shoulder dystocia with BPI out of 89,978 deliveries between 1980 and 2002.
• Rates were 0.5 per 1000 births for dystocia with BPI and 0.9/10,000 deliveries for permanent BPI.
• No significant differences were found in maternal demographics, diabetes, gestational age, labor duration, delivery methods, or dystocia management maneuvers between the groups.
• Fracture of the clavicle was significantly less frequent in the no-BPI group (2%) compared to the BPI group (17%).

Conclusions:

• Neither antepartum nor intrapartum factors effectively differentiate shoulder dystocia cases with versus without associated brachial plexus injury.
• The occurrence of clavicle fracture may be a potential indicator, though not a definitive predictor, of BPI in shoulder dystocia.
• Further research may be needed to identify subtle differentiating factors or novel predictive markers for BPI in shoulder dystocia.