Effect of Supine Position on Urinary Output in Pregnancy

Hendricks, Charles H.; Barnes, Allan C.

doi:10.1016/s0002-9378(16)38158-3

Cited by 18 publications

(4 citation statements)

References 20 publications

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“…This includes a very significant reduction in glomerular filtration rate, sodium excretion and urinary flow (4). High physical activity could also result in deeper engagement of the fetal head in the pelvis resulting in inter mittently reduced urinary flow through the ureters due to compression by the head (13). Furthermore, it has been shown by Adlercreutz and co-workers (1 ,8 ) that heavy exercise causes marked changes in plasma cortisol as well as in aldosterone, angiotensin II and renin activity which in turn might affect the renal function.…”

Section: Discussionmentioning

confidence: 99%

Short-Term Variations in Urinary Estriol and Renal Function

Fredricsson¹,

Carlström²,

Eneroth³

1978

Gynecol Obstet Invest

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Variation in urinary excretion of estriol was found to be related to physical activity and climate conditions. Estriol content of sweat was studied but was found not to be of an order to explain the variation observed. Estriol clearance rate was significantly reduced even by moderate physical activity. Creatinine clearance was not affected to the same extent. Different explanations to the findings are discussed. The need for strictly standardized conditions during urine sampling for estriol assays in risk pregnancies is stressed.

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Section: Discussionmentioning

confidence: 99%

Short-Term Variations in Urinary Estriol and Renal Function

Fredricsson¹,

Carlström²,

Eneroth³

1978

Gynecol Obstet Invest

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“…It has been demonstrated previously that urine flow in the recumbent near-term pregnant woman is appreciably less when she is lying on her back than when she is lying on her side and that without change of position the relative oliguria persists for several hours before it is overcome (1,2).…”

mentioning

confidence: 96%

The Effect of the Supine Position on Renal Function in the Near-Term Pregnant Woman12

Pritchard¹,

Barnes²,

Bright³

1955

J. Clin. Invest.

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It has been demonstrated previously that urine flow in the recumbent near-term pregnant woman is appreciably less when she is lying on her back than when she is lying on her side and that without change of position the relative oliguria persists for several hours before it is overcome (1, 2).The present report extends the observations on the effect of position on urine flow to include studies of sodium and potassium excretion, effective renal plasma flow, and glomerular filtration rate in near-term normal pregnant women, in women with eclamptogenic toxemia of pregnancy, and in women with large abdominal neoplasms originating in the pelvis. Attempts have been made to determine the mechanism by which the various observed changes in renal function are produced. METHODSStudies were made 11 times in 10 near-term normally pregnant women and 13 times in 8 women with preeclampsia. In most of these studies the excretion of sodium and potassium, the effective renal plasma flow (RPF) and the glomerular filtration rate (GFR) were measured. In one normal and one preeclamptic pregnant woman the observations were repeated following the insertion of large-bore heavy-walled ureteral catheters into both ureters well above the level of the pelvic brim. Similar renal function studies were made in two women who had large abdominal neoplasms arising from the pelvis, one an ovarian serous cystadenocarcinoma and the other a uterus containing multiple fibromyomas. Both tumors were approximately the size of a uterus at 32 to 34 weeks' gestation. Seven patients who had either delivered 7 or 8 days previously or who had undergone total hysterectomy 9 or 10 days before were also observed. Three subjects of this group had been studied previously while pregnant.All medications were stopped the night before; 2 hours before starting the study, a breakfast of milk, cereal, and 'This study was assisted by a grant from the Cleveland Area Heart Society. toast was allowed. One-half hour later an indwelling catheter was inserted into the bladder and oral hydration consisting of 100 ml. of water every 20 minutes was initiated. At this time in the 17 studies where effective renal plasma flow and inulin clearances were to be measured sodium paraminohippurate and inulin were given intravenously in suitable priming doses, followed by a sustaining infusion of each administered intravenously at a constant rate of 4 to 5 ml. per minute. Urine was collected in periods averaging 20 minutes each. With each collection the bladder was washed with distilled water followed by air. In 14 of the studies only the clearances of endogenous creatinine were determined.Paraminohippurate was measured by the method of Bratton and Marshall (3), inulin by the method of Higashi and Peters (4), and creatinine by the method of Bonsnes and Taussky (5). Sodium and potassium were determined with the Beckman flame photometer.Usually the initial observations were made in the lateral recumbent position. One hour after starting oral hydration and one-half hour before starting the first ...

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“…Furthermore, renal function in late pregnancy is profoundly influenced by posture. Walker et al (1933) demonstrated an impaired excretion of water and salt in the supine position, and this has been confirmed by other workers (Hendricks & Barnes 1955, Pritchard et al 1955. The explanation of this postural effect is still obscure.…”

Section: Renal Function In Pregnancymentioning

confidence: 78%

The Inferior Vena Cavogram in Pregnancy

Kerr

1964

Proceedings of the Royal Society of Medicine

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Effect of Supine Position on Urinary Output in Pregnancy

Cited by 18 publications

References 20 publications

Short-Term Variations in Urinary Estriol and Renal Function

Short-Term Variations in Urinary Estriol and Renal Function

The Effect of the Supine Position on Renal Function in the Near-Term Pregnant Woman12

The Inferior Vena Cavogram in Pregnancy

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