When the nurse administers a beta-adrenergic blocker to a patient with angina the nurse expects the drugs will help to control angina, but it also has what other effects?
Decreased urinary output.
Decreased strength of heart muscle contraction.
Increased heart rate.
Increased oxygen consumption.
The Correct Answer is B
Choice A rationale
Beta-adrenergic blockers generally do not decrease urinary output. These drugs primarily act on the cardiovascular system by blocking beta-adrenergic receptors, which results in lowered heart rate and blood pressure. Their effects are less pronounced on the renal system unless specific agents with renal effects are used.
Choice B rationale
Beta-adrenergic blockers decrease the strength of heart muscle contraction (negative inotropic effect). By blocking beta receptors, they inhibit the stimulatory effects of catecholamines on the heart, reducing the force of myocardial contraction, which helps decrease oxygen demand and control angina symptoms.
Choice C rationale
Beta-adrenergic blockers typically decrease heart rate (negative chronotropic effect) rather than increase it. They inhibit beta-adrenergic receptors, which leads to a slower heart rate and can help manage conditions like angina by reducing myocardial oxygen consumption.
Choice D rationale
Beta-adrenergic blockers decrease oxygen consumption by reducing heart rate and the force of contraction. These effects lower myocardial oxygen demand, which is beneficial for patients with angina by preventing episodes triggered by increased oxygen needs.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
Choice A rationale
Administering the medication even if the name of the drug can be clearly read is risky because the rest of the label might contain essential information like dosage, expiration date, and other critical instructions. Administering a medication without complete labeling increases the risk of medication errors.
Choice B rationale
Discarding the entire bottle and contents and obtaining a new bottle is the safest option. It ensures that the nurse is using a medication with a fully intact label, which includes all necessary information to safely administer the medication, such as dosage, route, and expiration date.
Choice C rationale
Asking another nurse to verify the contents of the bottle is not sufficient because the torn and soiled label still lacks complete information. Without all details, there's a risk of administering the wrong dosage or an expired medication.
Choice D rationale
Finding the drug information and making a new label for the bottle is not appropriate because it does not guarantee the accuracy of the dosage or other critical details that were on the original label. It's better to use a completely labeled and verified medication bottle.
Correct Answer is A
Explanation
Choice A rationale
True. Xanthine derivatives like theophylline can cause serious adverse effects, including brain damage, when blood levels become too high. It is critical to monitor theophylline levels to prevent toxicity and associated neurological complications.
Choice B rationale
False. If xanthine levels remain within therapeutic ranges, the risk of brain damage is minimized. However, this statement is incorrect as it does not acknowledge the potential severity of the adverse effects linked to elevated theophylline levels.
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