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[Obstetric brachial plexus palsy: incidence, monitoring of progress and prognostic factors].

INTRODUCTION
Obstetric brachial plexus palsy is related with shoulder dystocia, and its main risk factor is macrosomia. Its incidence is estimated to be between 0.1 and 6.3 cases per 1,000 live newborn infants. Most cases are resolved but can give rise to permanent functional deficiency, which means that there is an interest to identify possible prognostic factors.


PATIENTS AND METHODS
We conducted a descriptive study of newborn infants with obstetric brachial plexus palsy born in our hospital between the years 2011 and 2015. Maternal, perinatal and obstetric variables, as well as the type of lesion, were collected and were related with the possibility of recovery at six months.


RESULTS
Altogether 32 cases were diagnosed, which represents an incidence of 1.44‰ of live newborn infants. 59% were males and 37.5% of them were macrosomic. The most frequent disorder was injury to the plexus at the proximal level (94%). 44% suffered from shoulder dystocia, and 47% still had sequelae at the sixth month. The antecedent of shoulder dystocia was related with a poor prognosis for recovery.


CONCLUSIONS
The incidence of obstetric brachial plexus palsy has remained stable in recent years. The percentage of children who present sequelae at six months is significant. Prospective studies are needed to be able to establish the long-term prognostic factors of this pathology.