Lower Extremity Blood Flow Velocity in Obese versus Nonobese Pregnant WomenFunding This study is supported by Ruth Hargrave Fellowship Endowment in Obstetrics and Gynecology, Department of Obstetrics and Gynecology, University of Texas Medical Branch at Galveston.
01 August 2018
12 January 2019
19 February 2019 (online)
Objective Obesity and pregnancy are risk factors for venous thromboembolism (VTE). In nonpregnant individuals, abdominal obesity is associated with venous insufficiency. This study aimed to compare venous Doppler volume flow and velocity in the lower extremities of obese versus nonobese women.
Study Design A prospective cohort study was performed. Duplex ultrasound examined bilateral lower extremity venous flow and velocity (time-averaged mean velocity, TAMV). Flow was analyzed at the superficial femoral (SFV), distal external iliac (DEI), common femoral, profunda femoris, and popliteal veins. Mann–Whitney U-test, Spearman's correlation, and chi-square tests were used, with a significance of p < 0.05.
Results Left SFV TAMV and volume flow were higher in the obese group (5.1 [4.1–5.7] vs. 2.8 [1.7–3.4] cm/second; p < 0.001) and (89 [73–119] vs. 48 [26–62] cm/minute; p = 0.005). Significant differences were noted for right DEI flow (obese 326 [221–833] vs. nonobese 182 [104–355] cm/minute; p = 0.049). The right femoral profunda flow was also higher in obese (49 [40–93] cm/minute) compared with nonobese (31 [22–52] cm/minute; p = 0.041).
Conclusion Volume flow and TAMV in the lower extremities of obese gravidas are higher compared with nonobese ones. Thus, the increased risk of VTE among obese pregnant women may not be caused by venous stasis.
Keywordsblood flow velocity in pregnant women - obesity in pregnancy - venous doppler volume flow and velocity
This study was presented in a poster at the Society of Maternal–Fetal Medicine's 36th Annual Pregnancy Meeting, Atlanta, GA, February 2016. The views expressed in this manuscript are those of the author(s) and do not necessarily reflect the official policy or position of the Department of the Navy, Department of Defense, or the U.S. Government. Eryn H. Dutta, DO, is a military service member. This work was prepared as part of her official duties. Title 17, USC, §105 provides that “Copyright protection under this title is not available for any work of the US Government.” Title 17, USC, §101 defines a U.S. Government work as a work prepared by a military service member or employee of the U.S. Government as part of that person's official duties.
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