Multiple Choice
The noncontractile cardiac muscle cells that initiate their own depolarization and cause depolarization of the rest of the heart are called __________.
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18. The Heart
Cardiac Action Potentials
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In the context of cardiac action potentials, what is a pulse deficit?
A
The difference between the apical and radial pulse rates.
B
The reduction in heart rate during deep inspiration.
C
The difference in blood pressure readings between the left and right arms.
D
The time delay between the P wave and the QRS complex on an ECG.
Verified step by step guidance1
Understand the concept of a pulse deficit: It refers to the difference between the apical pulse (heart rate measured at the heart) and the radial pulse (heart rate measured at the wrist).
Recognize that a pulse deficit occurs when the heart's contractions are not all strong enough to create a palpable pulse at the radial artery.
Consider the physiological implications: A pulse deficit can indicate that not all heartbeats are effectively pumping blood into the systemic circulation.
Differentiate between the options given: The pulse deficit specifically refers to the difference between apical and radial pulse rates, not blood pressure differences or ECG time delays.
Relate the concept to clinical practice: A pulse deficit can be an important diagnostic tool in identifying conditions like atrial fibrillation, where irregular heartbeats may not always produce a palpable pulse.
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