Effect of maternal congenital heart defects on labor and delivery outcome: A population-based study

Length of hospital stay after delivery among Danish women with congenital heart disease: a register-based cohort study

Background

The literature about the impact of congenital heart disease (CHD) on the length of hospital stay after delivery is limited, and nonexisting in a country with free and equal access to healthcare. We aimed to examine the hypothesis that Danish women with CHD have a longer hospital stay after delivery compared to women without CHD. Secondarily, we aimed to examine the hypothesis that cesarean section modifies the association.

Methods

The study was a national cohort study using Danish nationwide registers in 1997–2014. Maternal CHD was categorized as simple, moderate, or complex CHD. The comparison group consisted of women without CHD. Outcome of interest was length of hospital stay after delivery registered in complete days. Mode of delivery was categorized as cesarean section or vaginal delivery. Data was analyzed using a generalized linear model with a Poisson distribution.

Results

We included 939,678 births among 551,119 women. Women without CHD were on average admitted to the hospital for 3.6 (SD 3.7) days, whereas women with simple, moderate, and complex CHD were admitted for 3.9 (SD 4.4), 4.0 (SD 3.8) and 5.1 (SD 6.7) days, respectively. The adjusted length of hospital stay after delivery was 12% (relative ratio (RR) = 1.12, 95% confidence interval (CI) 1.07–1.18), 14% (RR = 1.14, 95% CI: 1.07–1.21), and 45% (RR = 1.45, 95% CI: 1.24–1.70) longer among women with simple, moderate, and complex CHD, respectively, compared to women without CHD. The association between maternal CHD and length of hospital stay was not modified by mode of delivery (p-value of interaction = 0.62). Women who gave birth by cesarean section were on average admitted to the hospital for 2.7 days longer compared to women with vaginal delivery.

Conclusion

The hospital stay after delivery was significantly longer among women with CHD as compared to women without CHD. Further, higher complexity of CHD was associated with longer length of stay. Cesarean section did not modify the association.

Supplementary Information

The online version contains supplementary material available at 10.1186/s12884-021-04286-3.

Is vaginal delivery or caesarean section the safer mode of delivery in patients with adult congenital heart disease?

A best evidence topic in cardiac surgery was written according to a structured protocol. The question addressed was: is vaginal delivery or caesarean section (CS) the safer mode of delivery in patients with adult congenital heart disease? Of the 119 studies, 13 papers represented the best evidence on the topic. Recommendations are based on 29 262 patients. Those having undergone successful corrective or palliative cardiac surgery for congenital heart disease, in addition to patients with unoperated congenital heart disease are a high-risk obstetric population. Heart disease is a leading cause of maternal mortality in the USA and the UK. Traditionally, CS was regarded as the mode of delivery of choice for high-risk patients, but growing experience in this field has now made this advice appear controversial. Patients are stratified into high- and low-risk, depending on the degree of heart failure symptoms [New York Heart Association (NYHA) class]. All studies demonstrated adverse outcomes in ACHD patients compared with normal age-matched controls. This pertained to a higher overall risk of maternal cardiac death, neonatal death, preterm birth, fetal growth restriction and longer hospital stay. On univariate regression analysis, the variables that imparted the highest risk to mother and foetus, were right ventricular failure, pulmonary regurgitation and pulmonary hypertension (P < 0.001). Induction of labour was deemed safe and was not associated with higher CS rates. There was no increase in maternal or neonatal complications in patients who were NYHA class I and II at labour. Patients who were NYHA class III and IV at labour had higher complication rates with adverse feto-maternal outcomes (P < 0.0001) and longer intensive care unit and hospital stay (Spearman's correlation 0.326, P = 0.007). The largest cohort from the USA (26 973 ACHD births) demonstrated that ventricular septal defect was associated with the highest risk of maternal death and complications (P < 0.05). The data would indicate that patients NYHA class I and II symptoms are suitable for VD. For most NYHA III and IV patients a trail of labour is safe with expedited delivery under good analgesic control as dictated by obstetric needs. Due to high complication risks, CS may be indicated in a proportion of patients.

Pregnancy outcomes in women with mitral valve prolapse and mitral valve regurgitation

PURPOSE

To examine pregnancy and perinatal outcomes in patients with mitral valve disorders [mitral valve prolapse and/or mitral regurgitation; mitral valve disorders (MVD)].

METHODS

A retrospective comparative study was conducted comparing all singleton deliveries, during the years 1988-2010, of women with and without known MVD. Women lacking prenatal care were excluded. Stratified analysis using logistic regression was performed to control for confounds.

RESULTS

Out of 233,194 singleton deliveries that occurred during the study period, 390 deliveries occurred in women with MVD. Using a multivariate analysis, advanced maternal age (OR = 1.06; 95 % CI 1.05-1.08; P < 0.001), recurrent abortions (OR = 1.62; 95 % CI 1.15-2.28; P = 0.005), hypertensive disorders (OR = 1.62; 95 % CI 1.17-2.26; P = 0.004) and Jewish ethnicity (OR = 2.21; 95 % CI 1.76-2.79; P < 0.001) were found to be significantly associated with MVD. Since cesarean sections (CS) were significantly higher in deliveries of patients with MVD (17.9 vs. 14 %; P = 0.025), another multivariate analysis was constructed, with CS as the outcome variable. MVD was not found to be an independent risk factor for CS (OR = 1.05; 95 % CI 0.79-1.37; P = 0.74).

CONCLUSIONS

MVD associated with advanced maternal age, recurrent abortions, Jewish ethnicity and hypertensive disorders were not found to be an independent risk factor for CS.