Comparing the risk of maternal and perinatal complications among women with hypertensive disorders of pregnancy to normotensive women: an institution-based cohort review in Kenya.

BACKGROUND

Hypertensive disorders of pregnancy (HDP) remain a major cause of maternal and perinatal morbidity and mortality globally. Quantifying the effects of HDP on complications during pregnancy is vital for enhancing risk prediction and improving pregnancy outcomes.

METHODS

This study leveraged data from a cohort of 3652 women from a prior study investigating the prevalence of HDP at a tertiary maternity hospital in Kenya - between 1st January, 2018 and 31st December, 2019. Sociodemographic characteristics, pregnancy outcomes, and complications among women diagnosed with HDP compared with normotensive women were analysed. The maternal complications explored included acute renal injury, antepartum haemorrhage and postpartum haemorrhage. The perinatal complications included intrauterine foetal demise, intrauterine growth restriction, small-for-gestational-age neonates, preterm birth and low APGAR (7 or below). Log-binomial regression was used to estimate the risk ratios of maternal and perinatal complications between these groups. Both composite and individual complication analyses were done.

RESULTS

The rate of maternal complications within the study was 1.3% (46/3652), whereas perinatal complications occurred in 13.0% (474/3652). After adjusting for maternal age ≥ 35 years and caesarean delivery, women with HDP had 3.34 times the risk of maternal composite complications compared to normotensive women (adjusted risk ratio 3.34; 95% CI 1.81- 6.16). These complications included acute renal injury and postpartum haemorrhage. Furthermore, there was a significant association between HDP and composite perinatal complications (adjusted risk ratio 1.38; 95% CI 1.07- 1.77). Specifically, the risk of intrauterine foetal demise and intrauterine growth restriction was elevated among the HDP group compared to normotensive women.

CONCLUSION

HDP continues to pose a significant burden on pregnancy and childbirth in Kenya. A strong association between pregnancy complications and HDP has been demonstrated. Regionally adapted pregnancy surveillance and optimised management approaches for acute kidney injury, post partum haemorrhage and perinatal morbidity prevention are urgently needed.