Cardiac Performance, Dr. D. Penney

Self Assessment - Module 3:

1) Which of the following will cause an increase in left ventricular preload?

a. an increased end-diastolic pressure.
b. an increased end-diastolic volume.
c. both a and b.

2) An increase in inotropicity of the left ventricle will (increase/not change/decrease) ejection fraction and dp/dt.

3) Decreased compliance and increased resistance of the aorta and arteries cause an (increase / decrease) in left ventricular afterload and most likely results in an (increase/no change/decrease) in stroke volume.

4) Potassium and calcium are negative inotropic agents ( T / F ).

5) Cardiac hypertrophy as a response to chronically increased preload and/or afterload involves an (increase/no change/decrease) in muscle cell size and (increase/no change/decrease) in muscle cell number.

6) Increased inotropicity results from more frequent contractions (Bowditch effect), use of digitaloids, and greater cardiac sympathetic tone ( T / F ).

7) Which of the following factors is a response of the healthy heart to the stimulation of cardiac parasympathetic neurons?

a. a positive chronotropic action on the ventricles.
b. a shift of the Frank-Starling curve for the atria to the right.
c. both a and b.


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