A nurse in the emergency department is caring for a client who has myasthenia gravis and is in crisis.
Which of the following factors should the nurse identify as a possible cause of myasthenic crisis?
Not exercising enough.
Eating a diet high in protein.
Developing a respiratory infection.
Taking too much prescribed medication.
The Correct Answer is C
Choice A rationale
Not exercising enough is generally not a direct cause of myasthenic crisis. While regular exercise can improve overall health, myasthenic crisis is primarily triggered by factors that acutely worsen neuromuscular transmission, such as infections or medication issues, rather than a lack of physical activity. Myasthenia gravis is an autoimmune disorder characterized by fluctuating muscle weakness.
Choice B rationale
Eating a diet high in protein does not typically cause myasthenic crisis. While nutrition is important for overall health, there is no scientific evidence suggesting that high protein intake directly exacerbates or precipitates a myasthenic crisis. The crisis is usually linked to acute physiological stressors that further impair acetylcholine receptor function at the neuromuscular junction.
Choice C rationale
Developing a respiratory infection is a common precipitating factor for myasthenic crisis. Infections, particularly respiratory ones, increase systemic inflammation and metabolic demand, which can exacerbate the autoimmune attack on acetylcholine receptors at the neuromuscular junction. This further impairs nerve-to-muscle communication, leading to severe muscle weakness, particularly affecting respiratory muscles and potentially requiring ventilatory support.
Choice D rationale
Taking too much prescribed medication, specifically anticholinesterase inhibitors used to manage myasthenia gravis, can lead to a cholinergic crisis, which mimics some symptoms of myasthenic crisis but is distinct. A cholinergic crisis results from the overstimulation of acetylcholine receptors. While both are critical, the question specifically asks about myasthenic crisis, which is more commonly triggered by under-medication, infection, or other stressors, not typically an overdose of prescribed medications.
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Correct Answer is A
Explanation
Choice A rationale
A traumatic brain injury (TBI) causes immediate disruption of cellular membranes and organelles, leading to neuronal dysfunction and cell death. Concurrently, blood vessels can be torn or compressed, resulting in hemorrhage (hematoma formation) and ischemia, both contributing to secondary brain injury and impaired neurological function.
Choice B rationale
Damage to brain tissue from a traumatic brain injury is related to *increased* pressure from the initial impact and subsequent edema and hemorrhage, not decreased pressure shock waves. The primary injury involves mechanical forces that directly deform and injure brain tissue and blood vessels, leading to increased intracranial pressure.
Choice C rationale
A traumatic brain injury typically leads to *decreased* synaptic connections due to neuronal damage and death, not increased connections. The disruption of neural pathways and loss of neurons impair communication within the brain, contributing to cognitive and functional deficits, rather than enhancing synaptic plasticity.
Choice D rationale
While there can be an initial increase in blood flow to the injured area due to autoregulatory mechanisms, the *consequence* of a traumatic brain injury is often disruption of blood supply (ischemia) and significant edema, which further compromises cerebral perfusion and neuronal viability. The increased blood supply is often a transient, ineffective response.
Correct Answer is A
Explanation
Choice A rationale
A myasthenic crisis is a life-threatening exacerbation of myasthenia gravis characterized by severe muscle weakness, particularly affecting the respiratory muscles. This can lead to impending or actual respiratory failure, necessitating immediate intervention with mechanical ventilation to support breathing and prevent hypoxemia and hypercapnia.
Choice B rationale
A vasoconstrictor would elevate blood pressure by constricting blood vessels. Myasthenic crisis primarily involves profound muscle weakness, not typically hypotensive states requiring vasoconstrictors. Administering a vasoconstrictor would not address the underlying respiratory compromise or muscle weakness.
Choice C rationale
Pursed-lip breathing is a technique used to prolong exhalation and improve ventilation in individuals with obstructive lung diseases like COPD. While it can help with dyspnea, it is insufficient to manage the severe respiratory muscle weakness seen in a myasthenic crisis and would not prevent respiratory failure.
Choice D rationale
Sedatives depress the central nervous system and can further impair respiratory drive and muscle function, which would be detrimental in a myasthenic crisis. The client's respiratory status is already compromised, and sedation would exacerbate hypoventilation and increase the risk of respiratory arrest.
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