A nurse is caring for a client who has a cardiopulmonary arrest.
The nurse anticipates the emergency response team will administer which of the following medications if the client's restored rhythm is symptomatic bradycardia?
Magnesium.
Sodium bicarbonate.
Atropine.
Epinephrine.
The Correct Answer is C
This scenario requires applying advanced cardiac life support protocols for post-arrest arrhythmias. Knowledge of autonomic nervous system pharmacology is essential to identify the specific medication that increases heart rate by blocking parasympathetic vagal inhibition on the sinoatrial node during symptomatic bradycardia.
Choice A rationale
Magnesium sulfate is primarily utilized to treat torsades de pointes or hypomagnesemia. It acts as a calcium channel blocker in myocardial cells but does not specifically increase heart rate for bradycardia when normal sinus rhythm has already been restored.
Choice B rationale
Sodium bicarbonate is administered to treat specific metabolic acidosis or certain drug toxicities during prolonged arrest. It does not possess chronotropic properties and will not increase the heart rate in a client suffering from a symptomatic slow rhythm.
Choice C rationale
Atropine is an anticholinergic drug that inhibits the vagus nerve, effectively increasing the firing rate of the sinoatrial node. It is the first-line medication for symptomatic bradycardia to improve cardiac output and maintain adequate systemic tissue perfusion.
Choice D rationale
Epinephrine is a potent vasopressor and inotrope used primarily during active pulseless arrest. While it increases heart rate, atropine is specifically indicated first for a restored rhythm that remains slow and symptomatic before progressing to more powerful infusions.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
Intermaxillary fixation involves wiring the jaws together, creating a significant airway risk if emesis occurs. Nursing knowledge must prioritize airway patency and the prevention of aspiration by using gravity and mechanical clearing before employing irreversible measures like wire cutting.
Choice A rationale
Cutting fixation wires is a rescue action if the airway cannot be cleared by other means. It should not be the first step because it compromises the surgical repair of the mandible and requires specific tools.
Choice B rationale
Side-lying positioning uses gravity to prevent emesis from entering the trachea, while suctioning clears the oropharynx. This immediate intervention maintains airway patency and prevents aspiration pneumonia in a client whose jaws are immobilized by wires.
Choice C rationale
Notifying the provider is necessary after the client is stabilized. During an acute gagging episode, the nurse must act independently to secure the airway before spending time communicating, as delay increases the risk of fatal aspiration.
Choice D rationale
Antiemetics are used for prevention but cannot treat an active gagging and vomiting episode. Administering medication takes too long to take effect and does not address the immediate physical obstruction of the airway by emesis.
Correct Answer is B
Explanation
Evaluating neurological progression in traumatic brain injury involves applying the Glasgow Coma Scale and understanding brainstem function. Recognising the shift between abnormal posturing patterns is critical for identifying descending levels of brain injury and worsening central nervous system herniation.
Choice A rationale
Improved motor response, such as moving from abnormal posturing to localizing pain or following commands, indicates neurological recovery. This reflects better integration of the motor cortex and brainstem, suggesting that the initial injury or pressure is resolving.
Choice B rationale
Decorticate posturing involves damage to the corticospinal tract, while decerebrate posturing indicates more severe damage lower in the midbrain or brainstem. Progressing from decorticate to decerebrate signals significant neurological deterioration and potential brainstem herniation.
Choice C rationale
Decreased agitation can sometimes be a positive sign of recovery or a neutral sign of sedation. It does not specifically indicate worsening neurological status unless accompanied by a significant drop in the overall level of consciousness.
Choice D rationale
Increased responsiveness to external stimuli is a hallmark of neurological improvement. It suggests that the ascending reticular activating system and cerebral cortex are becoming more functional and integrated, which is the opposite of a worsening clinical state.
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