A nurse in an emergency department is reviewing a client's ECG reading.
Which of the following findings should the nurse identify as an indication that the client has first-degree heart block?
Prolonged PR intervals.
Nondiscernible P waves.
More P waves than QRS complexes.
No correlation between P and QRS waves.
The Correct Answer is A
First-degree heart block is a type of atrioventricular (AV) block that involves the consistent prolongation of the PR interval (defined as >0.20 seconds) due to delayed conduction via the atrioventricular node.
This is seen on an ECG as a PR interval greater than 200 ms in length.
Choice B: Nondiscernible P waves are not an answer because it is not mentioned as a characteristic of first-degree heart block in my sources.
Choice C: More P waves than QRS complexes is not an answer because it is not mentioned as a characteristic of first-degree heart block in my sources.
Choice D: No correlation between P and QRS waves is not an answer because it is not mentioned as a characteristic of first-degree heart block in my sources.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
After inhaling deeply using an incentive spirometer, you should hold your breath for 3 to 5 seconds before exhaling.
Choice A is wrong because exhaling slowly through pursed lips is not an instruction for using an incentive spirometer.
Choice C is wrong because placing hands on the upper abdomen during inhalation is not an instruction for using an incentive spirometer.
Choice D is wrong because positioning the mouthpiece.5 cm (1 in) from the mouth is not an instruction for using an incentive spirometer.
Correct Answer is B
Explanation
The glycosylated hemoglobin level (also known as HbA1c or A1C) is a laboratory test that reflects average levels of blood glucose over the previous two to three months.
It is the most widely used test to monitor chronic glycemic management.
Choice A is not the answer because fasting blood glucose level reflects only short-term glycemic control.
Choice C is not the answer because oral glucose tolerance test results reflect only short-term glycemic control.
Choice D is not the answer because postprandial blood glucose level reflects only short-term glycemic control.
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