The effects of postural changes of baroreflex gain in normal and hypertensive pregnancies
| Autor: | Tatsuo Yamamoto, Miyako Ohnishi, T. K. Fujii, Yoshiaki Miyake, Yuhei Ichimaru, Chika Yoneda, Sachie Takahashi |
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| Rok vydání: | 2002 |
| Předmět: |
Adult
medicine.medical_specialty Cardiac output Supine position Physiology Posture Pregnancy Complications Cardiovascular Baroreflex Heart Conduction System Pregnancy Reference Values Internal medicine Heart rate Internal Medicine medicine Humans Longitudinal Studies skin and connective tissue diseases business.industry Hemodynamics General Medicine Stroke volume medicine.disease Blood pressure Endocrinology Hypertension Gestation Female sense organs business |
| Zdroj: | Clinical and experimental hypertension (New York, N.Y. : 1993). 24(1-2) |
| ISSN: | 1064-1963 |
| Popis: | In order to understand the changes of baroreflex gain due to postural changes in normal pregnancies, we measured percentage changes (% changes) in blood pressure (SBP, DBP), heart rate (HR), stroke volume (SV), cardiac output (CO), total peripheral resistance (TPR) as well as cardiac autonomic nervous function (HF as an index of parasympathetic and LF/HF as an index of sympathetic function) and compared these parameters in normal pregnancies with those found in hypertensive pregnancies, such as chronic hypertensive (CHP) and severe preeclamptic pregnancies (PE), in late pregnancy (after 32 wks). When the position was changed from supine to standing in normal and non-pregnant women, the % changes of HR, DBP, TPR and LF/HF were increased and SBP, SV, CO and HF were decreased. The % changes of these parameters, however, were gradually decreased as pregnancy progressed, especially after 20-24 wks of gestation. In hypertensive pregnancies, however, even in late pregnancy, the decreased SBP and increased TPR was still observed and the profound decrease of CO and SV and increase of TPR were characteristic in PE when compared to CHP. |
| Databáze: | OpenAIRE |
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