Which of the following is incorrect regarding adenosine administration?
The drug is used to treat narrow complex tachycardia.
The drug should be given slow IV push.
If no change in the heart rhythm is noted, another dose may be given.
The drug should be given fast IV push.
The Correct Answer is B
A. Adenosine is correctly used to treat supraventricular tachycardia with a narrow QRS complex.
B. Adenosine should not be given slowly; it must be administered as a rapid IV push followed by a saline flush to be effective.
C. If the first dose is ineffective, a second dose may be administered according to protocol.
D. Administering adenosine as a fast IV push is the correct method to achieve transient AV nodal blockade.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
A. The vertical spike seen on the ECG represents the pacemaker's electrical stimulus, but capture specifically refers to the heart’s response—not just the spike itself.
B. Failure to capture occurs when the pacemaker delivers a stimulus without causing depolarization, but this is the opposite of capture.
C. The pacemaker rate is the pacing rate, not capture. While it is often set above the intrinsic rate, this does not define capture.
D. Capture occurs when the pacemaker’s electrical stimulus successfully depolarizes the myocardium, producing a corresponding P wave (atrial pacing) or QRS complex (ventricular pacing) on the ECG. Effective capture confirms the pacemaker is working and coordinating appropriately with the heart’s electrical system.
Correct Answer is A
Explanation
A. Dyspnea, unusual fatigue, and diaphoresis are classic early signs and symptoms of ACS and may indicate myocardial ischemia or infarction.
B. Peripheral cyanosis and hypertension are not typical presenting symptoms of ACS and may indicate other cardiovascular issues.
C. Hypotension and cyanosis can occur in severe ACS but are not the most common initial signs.
D. Peripheral cyanosis and hypertension are less specific for ACS; dyspnea alone is insufficient without other classic symptoms.
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