The nurse is instructing a group of students about the ability to increase the strength of a cardiac contraction. Which medical term is appropriate for the nurse to use when referring to this topic?
1. Positive inotropic effect
2. Negative inotropic effect
3. Preload
4. Afterload
Correct Answer: 1
Rationale 1: The ability to increase the strength of contraction is called a positive inotropic effect.
Rationale 2: Negative inotropic effect would be a reduction in the strength of contraction.
Rationale 3: Preload is the degree to which the heart fibers are stretched just prior to contraction.
Rationale 4: Afterload is the pressure in the aorta that must be overcome for blood to be ejected from the left side of the heart.
Global Rationale: The ability to increase the strength of contraction is called a positive inotropic effect. Negative inotropic effect would be a reduction in the strength of contraction. Preload the degree to which the heart fibers are stretched just prior to contraction. Afterload is the pressure in the aorta that must be overcome for blood to be ejected from the left side of the heart.
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