Stroke volume is increased by :

Discussion in 'MRCP Forum' started by susan, Sep 17, 2004.

  1. susan

    susan Guest

    Stroke volume is increased by :

    (1) An increase in afterload

    (2) An increase in heart rate

    (3) A decrease in contractility

    (4) A decrease in venous compliance

    Ans. 4

    Stroke volume depends on preload, afterload, and contractility. Decreasing venous compliance, forces more blood into the ventricle, resulting in an increased preload and an increased stroke volume. Increasing afterload and decreasing contractility decreases stroke volume. An increase in heart rate may result in a decreased filling time and, therefore, a decrease in preload and stroke volume. A decrease in coronary blood flow causes a decrease in ventricular contractility and stroke volume.



    (Ref. Rhoades, Pg. 263- 269)
  2. susan

    susan Guest

    ans.

    Stroke volume is increased by :

    (1) An increase in afterload

    (2) An increase in heart rate

    (3) A decrease in contractility

    (4) A decrease in venous compliance

    Ans. 4

    Stroke volume depends on preload, afterload, and contractility. Decreasing venous compliance, forces more blood into the ventricle, resulting in an increased preload and an increased stroke volume. Increasing afterload and decreasing contractility decreases stroke volume. An increase in heart rate may result in a decreased filling time and, therefore, a decrease in preload and stroke volume. A decrease in coronary blood flow causes a decrease in ventricular contractility and stroke volume.



    (Ref. Rhoades, Pg. 263- 269)

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