Early-onset thrombocytopenia in near-term and term infants with perinatal asphyxia.

BACKGROUND

Neonates after perinatal asphyxia are at increased risk of thrombocytopenia. The correlation between perinatal asphyxia and the risk and severity of early-onset thrombocytopenia is not well known.

OBJECTIVE

To estimate the incidence, severity and risk factors for early-onset thrombocytopenia in neonates after perinatal asphyxia.

METHODS

We included all newborns (gestational age ≥ 36 weeks) admitted to our neonatal nursery due to perinatal asphyxia in this retrospective study. We collected platelet counts that were obtained within the first 48 h of life to estimate the incidence and severity of early-onset thrombocytopenia.

RESULTS

A total number of 171 neonates with perinatal asphyxia were included in the study. The incidence of early-onset thrombocytopenia (platelet count < 150 × 109/l) was 51% (87/171). Several factors were associated with increased risk of early-onset thrombocytopenia, including prolonged prothrombin time (PT) [odds ratio (OR) 1·18, 95% confidence interval (CI) 1·08–1·30, P < 0·01], prolonged activated partial thromboplastin time (APTT) (OR 1·07, 95% CI 1·03–1·11, P < 0·01), low Apgar score at 10 min (OR 1·25, 95% CI 1·08–1·45, P < 0·01) and high serum lactate (OR 1·12, 95% CI 1·06–1·19, P < 0·01). After multiple logistic regression analysis, we found an independent association between early-onset thrombocytopenia and prolonged PT (OR 1·15, 95% CI 1·00–1·33, P = 0·045) and higher lactate level (OR 1·15, 95% CI 1·03–1·28, P = 0·01).

CONCLUSIONS

Early-onset thrombocytopenia occurs frequently in neonates after perinatal asphyxia and is independently associated with PT and lactate level.