What part of the ECG would you look for atrial depolarization?
Pwave.
Twave.
QRS complex.
ST Segment.
The Correct Answer is A
Choice A rationale:
The P wave on an ECG represents atrial depolarization, which is when the atria contract.
Choice B rationale:
The T wave represents ventricular repolarization, which is when the ventricles relax.
Choice C rationale:
The QRS complex represents ventricular depolarization, which is when the ventricles contract.
Choice D rationale:
The ST segment represents the period when the ventricles are depolarized.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
Choice A rationale:
Phenytoin 100 mg PO every 8 hr is a standard prescription for controlling seizures.
Choice B rationale:
Lisinopril 20 mg PO every 12 hr is a typical dose for treating high blood pressure.
Choice C rationale:
“Hold for systolic BP less than 110 mm Hg” is unclear because it does not specify which medication to hold.
Choice D rationale:
Morphine 2.5 mg IV bolus PRN for incisional pain is a standard prescription for pain control after surgery.
Choice E rationale:
Regular insulin 7 units subcutaneous 30 min before breakfast and dinner is a common prescription for managing blood glucose levels in diabetes patients.
Correct Answer is C
Explanation
Choice A rationale:
Anaphylaxis is not an unusual response due to an inherited predisposition. It’s an acute allergic reaction.
Choice B rationale:
Anaphylaxis is not a predictable and often unavoidable secondary effect that can occur at a usual therapeutic dose. It’s an unpredictable and severe allergic reaction.
Choice C rationale:
Anaphylaxis is indeed a severe hypersensitivity or allergic reaction that is life-threatening. It requires immediate medical attention.
Choice D rationale:
Anaphylaxis will not cause withdrawal symptoms when you discontinue taking the medication. It’s an immediate allergic reaction.
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