Studies in the Problems of Circulation in Pregnancy

Werkö, Lars

doi:10.1002/9780470715147.ch16

Cited by 3 publications

(3 citation statements)

References 2 publications

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“…the increase more than doiihling thereafter. These findings are consistent with those of Werko (1950). and Waltcrs et al (1966) who found increases in cardiac output in patients between 7 and 12, and between 8 and 11 weekc gestation.…”

Section: T I M Of Increase Of Minute Tlisturicesupporting

confidence: 92%

“…It seems improbable that i n studie\ performed before discovery of the wpine effect w i c t attention would have been paid to maintenance of an undisturbed wpine position throughout the period of investigation Thus the fall in caidiac output In the third trimester described by Adams Kr Alexander (1958), Werko (1950). Palmer B Walker (1949) .…”

Section: Cardiac Output In the Lasl Trime5termentioning

confidence: 99%

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Stroke and minute distance in pregnancy: a longitudinal study using Doppler ultrasound

Mclennan

Haites

Rawles

1987

BJOG

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Summary Using Doppler ultrasound directed at the aortic arch, stroke and minute distance were measured in 45 normal singleton pregnancies and compared with 42 controls. In the non‐pregnant controls, stroke distance was 5% more in the supine than in the left lateral position (P<0·01) and during pregnancy this relativity was maintained until 36 weeks gestation. In the supine and left lateral positions respectively, stroke distance was increased by 8% (both) at 4 weeks (P<0·05 and NS), by 14 and 11% at 8 weeks (P<0·001 and P<0·01) and showed a maximum increase of 21 and 20% at 16 weeks gestation (both P<0·001). At 40 weeks, supine stroke distance was 14% less than the non‐pregnant control value (P<0·001), and 6% less than the value in the left lateral position (P<0·05), which was itself not significantly different from that in the non‐pregnant controls. The maximum increase of heart rate was at 32 weeks, by 24% in the supine and by 19% in the left lateral position (both P<0·001). Minute distance was maximally increased by 37% in the supine at 16 weeks (P<0·001) and by 30% in the left lateral position at 24 weeks (P<0·001). Thereafter, minute distance, measured in both positions, declined until at 40 weeks it was not significantly different from the non‐pregnant control value.

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Section: T I M Of Increase Of Minute Tlisturicesupporting

confidence: 92%

Section: Cardiac Output In the Lasl Trime5termentioning

confidence: 99%

Stroke and minute distance in pregnancy: a longitudinal study using Doppler ultrasound

Mclennan

Haites

Rawles

1987

BJOG

View full text Add to dashboard Cite

show abstract

“…The pulmonary blood flow must obviously be increased if the cardiac output is increased, but there is some uncertainty about the pulmonary resistance and blood volume. ' Increased vascular markings' have often been noted on radiological examination, but Werko (1950) concluded that the pressure in the pulmonary artery was slightly reduced and that the pulmonary blood volume was not altered, whereas Adams (1954) thought that the pulmonary blood volume was increased at the thirtieth week of pregnancy.…”

Section: Physiological Changes During Pregnancymentioning

confidence: 99%