When a patient is taking an adrenergic agonist drug, the nurse expects to observe which effect?
Constricted pupils
Increased heart rate
Bronchial constriction
Increased GI peristalsis
The Correct Answer is B
A. Constricted pupils: Adrenergic agonist drugs typically cause pupil dilation (mydriasis), not constriction.
B. Increased heart rate: Adrenergic agonists stimulate the sympathetic nervous system, leading to increased heart rate (positive chronotropic effect) and increased cardiac contractility (positive
inotropic effect).
C. Bronchial constriction: Adrenergic agonists typically cause bronchodilation, not constriction.
D. Increased GI peristalsis: Adrenergic agonists usually inhibit GI motility, leading to decreased GI peristalsis and potentially constipation
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
A. Dobutamine is a sympathomimetic drug used to increase cardiac output in conditions such as heart failure. It is not an antidote for cholinergic drug overdose.
B. Atropine sulfate is the antidote for cholinergic drug overdose. It acts as a competitive antagonist to acetylcholine at muscarinic receptors, counteracting the effects of excessive cholinergic stimulation.
C. Atenolol is a beta-blocker used to manage hypertension and certain cardiac conditions. It is not an antidote for cholinergic drug overdose.
D. Bethanechol is a cholinergic agonist used to stimulate bladder contractions in urinary retention. It is not an antidote for cholinergic drug overdose; in fact, it would exacerbate cholinergic effects.
Correct Answer is A
Explanation
A. Dantrolene injection, a skeletal muscle relaxant: The patient is exhibiting signs of malignant hyperthermia, a potentially life-threatening complication of anesthesia. Dantrolene is the primary treatment for malignant hyperthermia as it acts as a skeletal muscle relaxant, reducing muscle rigidity and hypermetabolism associated with the condition.
B. Cardiopulmonary resuscitation (CPR) and intubation: While the patient is experiencing significant physiological distress, initiating CPR and intubation would be premature without first addressing the underlying cause, which appears to be malignant hyperthermia.
C. An anticholinesterase drug, such as neostigmine: Anticholinesterase drugs like neostigmine are not indicated for the treatment of malignant hyperthermia.
D. Naltrexone hydrochloride injection, an opioid reversal drug: Naltrexone is used for opioid overdose reversal and is not appropriate for the treatment of malignant hyperthermia.
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