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Barometric Pressure Drops and Premature Rupture of Membranes
Timothy E Klatt1, Christy D South2, Aniko D Szabo3
1Department of Obstetrics and Gynecology, Medical College of Wisconsin, Milwaukee, Wisconsin, tklatt@mcw.edu.
Introduction:
Many patients and health care providers believe that barometric pressure drops increase the incidence of premature rupture of membranes (PROM). To test this, we studied high risk women living near a weather station.
Methods:
This cohort chart review study investigated 189 PROMs, diagnosed between 24 and 42 weeks gestation, at Wheaton Franciscan-St Joseph Campus, Milwaukee, Wisconsin. National Oceanic and Atmospheric Administration (NOAA) data from the 24 hours preceding each PROM occurrence were analyzed. The sample provided 91% power to detect a two-fold increase in the PROM rate.
Results:
The PROM rate, 9.5%, within the 24 hours following a NOAA-defined substantial pressure drop, was similar to that predicted using the percentage of the total study period time within 24 hours after a substantial pressure drop, 10.8%, (P= .64). The findings for within 3, 6, and 12 hours after a substantial pressure drop were similar.
Conclusions:
The incidence of PROM does not increase following substantial atmospheric pressure drops.
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