General Obstetrics and Gynecology: ObstetricsVenous thromboembolism during pregnancy and the postpartum period: Incidence, risk factors, and mortality
Section snippets
Material and methods
Data for this study were obtained from the Nationwide Inpatient Sample (NIS), from the Healthcare Cost and Utilization Project (HCUP) of the Agency for Healthcare Research and Quality (AHRQ). The NIS contains data from 5 to 8 million hospital stays from about 1000 US hospitals and is the largest all-payer inpatient care database in the US. The NIS is a 20% stratified sample of all discharges and allows for national estimates. Included in the sample are general hospitals and academic medical
Results
During the period from 2000 to 2001, there were 9,058,162 pregnancy admissions and 73,834 postpartum admissions. Among the pregnancy admissions, there were 8,330,927 deliveries. Of these, 6,400,956 (77%) were vaginal and 1,929,971 (23%) were cesarean. There were 3375 arterial thromboembolic events (2850 strokes and 525 myocardial infarctions) in addition to the 14,335 venous thromboembolic events. Therefore, venous thromboembolic events were 4 times more common than arterial events. Among the
Comment
We found a higher incidence of pregnancy-related venous thromboembolism, 1.72 per 1000 deliveries, than has been previously reported. While none of the reports are from the US, and none have included as many cases, the previously published figures for the incidence of pregnancy-related venous thromboembolism range from 0.71 to 1.25 per 1000 deliveries.9, 10, 11, 12, 13, 14
Data from the Nationwide Inpatient Sample are limited to information derived from discharge abstracts. Consequently,
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Cited by (0)
This study was funded in part by a grant from the National Institutes of Health (5K12-HD043446-03).