Circulatory effects of pregnancy

Roy, Shane; Malkani, Parvati K.; Virik, Ranjit; Bhatia, M. L.

doi:10.1016/0002-9378(66)90318-8

Cited by 19 publications

(2 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…According to the Az-formula, SV and CO increased significantly during pregnancy and reached their maximum values at 2+28 weeks of gestation. The percentage increase compared to the individual post partum value and the change in SV and CO during the course of pregnancy are in good agreement with known haemodynamic data obtained byinvasivetechniques[l4, 16,17,20,22].…”

Section: Discussionsupporting

confidence: 88%

Cardiac output in normal pregnancy measured by impedance cardiography

Myhrman

Granérus

Karlsson

et al. 1982

Scand J Clin Lab Invest

View full text Add to dashboard Cite

Cardiac output in normal pregnancy measured by impedance cardiography. Scand. J. clin. Lab. Invest. 42, 513-520, 1982.Impedance cardiography was used to study cardiodynamic changes throughout normal pregnancy. Stroke volume, heart rate and cardiac output were determined in fourteen normal primigravidae from early pregnancy until 6-25 weeks after delivery. To elucidate the influence of the patient's position on cardiac output, measurements were made in the supine as well as in the left and right lateral positions. Stroke volume and cardiac output increased up to the 28th week of pregnancy and then decreased during late pregnancy. These changes seemed to be independent of the patient's position. After delivery a further reduction in cardiac output due to a significant decrease in heart rate was found. No significant differences in cardiac output were found between right and left lateral position. However, during pregnancy as well as after delivery, cardiac output measured by impedance cardiography was significantly higher in the supine position than in the lateral positions. Thus, the impedance method does not seem to be reliable in measuring absolute values of stroke volume and cardiac output but may be used for relative measurements during pregnancy.

show abstract

Section: Discussionsupporting

confidence: 88%

Cardiac output in normal pregnancy measured by impedance cardiography

Myhrman

Granérus

Karlsson

et al. 1982

Scand J Clin Lab Invest

View full text Add to dashboard Cite

show abstract

“…Cardiac output increases as a function of increased stroke volume and heart rate. 13,14,24,25,30 This increase in cardiac output results, in part, from the hypertrophy of the left ventricle. The increase in cardiac size can be detected even before the cardiovascular demands of the fetus are evident.…”

Section: Maternal Cardiovascular Adaptations To Pregnancy and Exercisementioning

confidence: 99%

How Does Strenuous Maternal Exercise Affect The Fetus? A Review

Woodward

1981

Birth

View full text Add to dashboard Cite

The preponderance of studies suggest that in physically fit women, physiologic mechanisms have been developed which increase fetal tolerance to the circulatoty and respiratory challenges of strenuous maternal exercise. Ventilatory reserve and cardiovascular changes of pregnancy join to protect the fetus in normal pregnancy, and some of these changes are further developed by physical training.The fetal heart rate response to strenuous maternal exercise may provide early diagnosis of uteroplacental insufficiency (UPI). In UPI, the fetal heart rate responds with tachycardia during the exercise, followed by bradycardia for a prolonged period. In preliminary investigations, fetal breathing movements have been more responsive to maternal exercise than have fetal heart rates. (Birth Fam J 8:1, Spring 1981)

show abstract

Early diastolic time intervals during hypertensive pregnancy

Spinelli

Ferrò

Nappi

et al. 1987

Clinical Cardiology

View full text Add to dashboard Cite

Summary: Early diastolic time intervals have been assessed by means of the echopolycardiographic method in 17 pregnant women who developed hypertension during pregnancy (HP) and in 14 normal pregnant women (N). Systolic time intervals (STI), stroke volume (SV), ejection fraction (EF), and mean velocity of myocardial fiber shortening (VCF) were also evaluated. Recordings were performed in the left lateral decubitus (LLD) and then in the supine decubitus (SD). In LLD, isovolumic relaxation period (IRP) was prolonged in the hypertensive pregnant women compared with normal pregnant women (HP 51f12.5ms, N 32.4f15msp<0.05), whereastimeof the mitral valve maximum opening (DE) was not different in the groups. There was no difference in SV, EF, and mean VCF, whereas STI showed only a significant (p <0.05) lengthening of pre-ejection period (PEP) in HP. When the subjects shifted from the left lateral to the supine decubitus position, left ventricular ejection time index (LVETi) and SV decreased significantly (p <0.05) in both normotensive hypertensive pregnant women. IRP and PEP lengthened significantly (p < 0.05) only in normals, whereas they were unchanged in HP. DE time did not vary in either group. In conclusion, hypertension superimposed on pregnancy induces lengthening of IRP, as well as of PEP, and minimizes the effects of the postural changes in preload on the above-mentioned time intervals.

show abstract

Circulatory effects of pregnancy

Cited by 19 publications

References 13 publications

Cardiac output in normal pregnancy measured by impedance cardiography

Cardiac output in normal pregnancy measured by impedance cardiography

How Does Strenuous Maternal Exercise Affect The Fetus? A Review

Early diastolic time intervals during hypertensive pregnancy

Contact Info

Product

Resources

About