An adult client with third-degree AV block is admitted to the cardiac care unit and placed on continuous cardiac monitoring. What rhythm characteristic will the ECG most likely show?
History of type 2 diabetes
Interval and RR interval are irregular
Shortened PR interval
Inconsistently shaped P waves
PR interval is constant.
Apical heart rate
Fewer QRS complexes than P waves
PP interval is equal to RR interval.
Correct Answer : G
A. History of type 2 diabetes is not a rhythm characteristic seen on an ECG. While diabetes can contribute to the development of cardiovascular issues, it does not specifically describe the characteristics of a third-degree AV block on an ECG.
B. Interval and RR interval are irregular is incorrect. In third-degree AV block (also known as complete heart block), the atrial rate and ventricular rate are typically regular, but the atrial and ventricular rhythms are completely dissociated.
C. Shortened PR interval is incorrect. In third-degree AV block, there is no consistent PR interval because the atria and ventricles are functioning independently.
D. Inconsistently shaped P waves is incorrect. P waves may appear normal, but the relationship between P waves and QRS complexes is lost in third-degree AV block.
E. PR interval is constant is incorrect. In third-degree AV block, the PR interval is inconsistent or absent, as the atrial and ventricular rates are independent of each other.
F. Apical heart rate is irrelevant here. The ECG will show the characteristic findings of third-degree AV block rather than focusing on apical heart rate alone.
G. Fewer QRS complexes than P waves is correct. In third-degree AV block, the atrial impulses (P waves) are conducted normally, but the ventricles are completely dissociated from the atrial rhythm, leading to fewer QRS complexes than P waves, as the ventricles may be paced by an escape rhythm.
H. PP interval is equal to RR interval is not necessarily true in third-degree AV block. The PP and RR intervals may be different depending on the escape rhythm, but they are not usually exactly equal.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
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Correct Answer is D
Explanation
A. Blood pressure and heart rate are not indicators of opioid overdose; these values are within a normal range and do not suggest respiratory depression.
B. A temperature of 100.5°F and sleepiness are concerning but not life-threatening in isolation; the patient is easily aroused, which suggests they are not in respiratory distress.
C. A respiratory rate of 10 breaths/min is low, but if the patient is breathing deeply, they may still be compensating, and further monitoring is necessary.
D. A respiratory rate of 8 breaths/min with snoring is indicative of severe respiratory depression, a life-threatening side effect of opioid use. Immediate intervention is necessary.
Correct Answer is C
Explanation
A. Chlordiazepoxide is a benzodiazepine used for alcohol withdrawal, but folic acid is not commonly used for managing withdrawal symptoms.
B. Promethazine is an antiemetic, and thiamine is given to prevent Wernicke's encephalopathy, but they are not primarily used to manage withdrawal symptoms.
C. Chlordiazepoxide and lorazepam are both benzodiazepines that are commonly used to manage alcohol withdrawal symptoms by calming the nervous system and preventing seizures or delirium tremens.
D. Lorazepam is appropriate, but promethazine is not typically used to treat alcohol withdrawal symptoms.
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