OBJECTIVES: To investigate the relationship between second-trimester uterine artery Doppler findings and parity in a large pregnant population. METHODS: Uterine artery Doppler studies were performed in all singleton pregnancies at 18-23 weeks of gestation. The mean uterine artery resistance index and the presence or absence of protodiastolic notches were recorded. Two groups were identified: pregnancies not complicated by pre-eclampsia, and pregnancies with pre-eclampsia severe enough to require delivery at or before 32 weeks of gestation. RESULTS: In the 4132 pregnancies uncomplicated by pre-eclampsia, parity was shown to be an independent predictor for both mean uterine artery resistance index (beta = 0.073, P < 0.001) and the presence of bilateral protodiastolic notches (odds ratio = 0.67; 95% CI, 0.45-0.98). In the 17 pregnancies complicated with severe pre-eclampsia, uterine artery Doppler indices showed a trend towards being better predictors of disease in nulliparous compared with parous women. CONCLUSION: Parity has a significant effect on the resistance index and the prevalence of protodiastolic notching in the uterine artery flow waveforms. This difference is clinically noticeable in its effect on notching. These findings suggest that some permanent modification may persist in the maternal vessels after a successful pregnancy, altering their impedance in subsequent pregnancies. Copyright 2003 ISUOG. Published by John Wiley & Sons, Ltd.
OBJECTIVES: To investigate the relationship between second-trimester uterine artery Doppler findings and parity in a large pregnant population. METHODS: Uterine artery Doppler studies were performed in all singleton pregnancies at 18-23 weeks of gestation. The mean uterine artery resistance index and the presence or absence of protodiastolic notches were recorded. Two groups were identified: pregnancies not complicated by pre-eclampsia, and pregnancies with pre-eclampsia severe enough to require delivery at or before 32 weeks of gestation. RESULTS: In the 4132 pregnancies uncomplicated by pre-eclampsia, parity was shown to be an independent predictor for both mean uterine artery resistance index (beta = 0.073, P < 0.001) and the presence of bilateral protodiastolic notches (odds ratio = 0.67; 95% CI, 0.45-0.98). In the 17 pregnancies complicated with severe pre-eclampsia, uterine artery Doppler indices showed a trend towards being better predictors of disease in nulliparous compared with parous women. CONCLUSION: Parity has a significant effect on the resistance index and the prevalence of protodiastolic notching in the uterine artery flow waveforms. This difference is clinically noticeable in its effect on notching. These findings suggest that some permanent modification may persist in the maternal vessels after a successful pregnancy, altering their impedance in subsequent pregnancies. Copyright 2003 ISUOG. Published by John Wiley & Sons, Ltd.
Authors: Stefanie N Hinkle; Paul S Albert; Pauline Mendola; Lindsey A Sjaarda; Edwina Yeung; Nansi S Boghossian; S Katherine Laughon Journal: Paediatr Perinat Epidemiol Date: 2013-12-09 Impact factor: 3.980
Authors: Satvinder Kaur; Choon Ming Ng; Slyvia E Badon; Rohana Abdul Jalil; Dhivyalosini Maykanathan; Hip Seng Yim; Hamid Jan Jan Mohamed Journal: BMC Public Health Date: 2019-06-13 Impact factor: 3.295
Authors: Zuelma A Contreras; Julia E Heck; Pei-Chen Lee; Xin Cui; Calvin J Hobel; Carla Janzen; Fred Lurmann; Beate Ritz Journal: Environ Epidemiol Date: 2018-06-21