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Hydrostatic mechanism in the roll-over test

B Sobel, D Laurent, S Ganguly

    Obstetrics and Gynecology
    |March 1, 1980
    PubMed
    Summary
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    The roll-over test for predicting pregnancy-induced hypertension is affected by arm position. Hydrostatic effects explain blood pressure differences between arms, but pregnant women show a greater overall increase, indicating real central blood pressure changes.

    Area of Science:

    • Physiology
    • Obstetrics
    • Cardiovascular Research

    Background:

    • The roll-over test is used to predict pregnancy-induced hypertension.
    • The specific arm used for blood pressure measurement in this test has not been standardized.
    • Arm position relative to the heart significantly impacts blood pressure readings.

    Purpose of the Study:

    • To investigate the influence of arm selection on roll-over test results.
    • To determine if hydrostatic effects account for differences in blood pressure measurements between the right and left arms during the roll-over test.
    • To assess blood pressure changes in pregnant women during the roll-over test.

    Main Methods:

    • Blood pressure was measured in the right and left arms sequentially in 9 men and 8 nonpregnant women during a roll-over maneuver (left lateral to supine).

    Related Experiment Videos

  • Simultaneously, blood pressure was measured in both arms of 10 pregnant women during the roll-over test.
  • The hydrostatic effect due to the vertical distance between brachial arteries in the left lateral position was analyzed.

    • Main Results:

    • In nonpregnant individuals, diastolic blood pressure rose in the right arm and fell in the left arm post-roll-over, attributed to hydrostatic effects.
    • Pregnant subjects also exhibited arm-specific differences explained by hydrostatic factors.
    • However, pregnant women showed a greater overall increase in blood pressure in both arms, suggesting a genuine elevation in central blood pressure.

    Conclusions:

    • Arm selection influences roll-over test outcomes due to hydrostatic pressure differences.
    • While hydrostatic factors are present in pregnant women, the observed augmented blood pressure increase indicates a true change in central hemodynamics.
    • Standardization of arm use in the roll-over test is crucial for accurate prediction of pregnancy-induced hypertension.