A nurse is explaining myasthenia gravis to a family. Which of the following points would be included in the explanation? (Select All that Apply.)
Is it caused by demyelination of the nerve fibers.
Is it thought to be an autoimmune disease.
It is associated with destruction of acetylcholine receptor sites.
Once symptoms present, it has a 5-year survival rate.
It is a chronic and progressive muscular disease.
Is it best treated with antibiotics.
Correct Answer : B,C,E
A) Is it caused by demyelination of the nerve fibers:
Myasthenia gravis is not primarily caused by demyelination of nerve fibers. It is characterized by dysfunction at the neuromuscular junction, specifically involving the acetylcholine receptors.
B) Is it thought to be an autoimmune disease:
This is correct. Myasthenia gravis is considered an autoimmune disorder in which the body's immune system mistakenly targets and attacks its own tissues, particularly the acetylcholine receptors at the neuromuscular junction.
C) It is associated with destruction of acetylcholine receptor sites:
This is correct. In myasthenia gravis, there is a reduction in the number of functional acetylcholine receptors due to autoimmune-mediated destruction or blocking of these receptors.
D) Once symptoms present, it has a 5-year survival rate:
This statement is inaccurate. Myasthenia gravis is a chronic condition, but survival rates are not determined by the onset of symptoms. With appropriate treatment, many individuals with myasthenia gravis can manage their symptoms effectively and have a normal life expectancy.
E) It is a chronic and progressive muscular disease:
This is correct. Myasthenia gravis is a chronic neuromuscular disorder characterized by fluctuating muscle weakness and fatigue. While it is chronic, it is not necessarily progressive in all cases, as symptoms may stabilize or improve with treatment.
F) Is it best treated with antibiotics:
Antibiotics are not the primary treatment for myasthenia gravis. Treatment typically involves medications that enhance neuromuscular transmission, such as acetylcholinesterase inhibitors or immunosuppressive drugs, along with other supportive measures.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
B) Tachycardia:
Anticholinergic drugs, by blocking the action of acetylcholine at muscarinic receptors, can lead to increased sympathetic activity, resulting in tachycardia. Acetylcholine normally acts to moderate heart rate via vagal stimulation, so blocking its effects with anticholinergic medications can lead to an unopposed sympathetic response, causing an increase in heart rate.
A) Urinary Frequency:
Anticholinergic drugs typically cause urinary retention rather than urinary frequency. By blocking muscarinic receptors in the bladder, these medications can lead to decreased bladder contractility and urinary retention. Urinary frequency is not a common adverse effect of anticholinergic drugs.
C) Tachypnea:
Tachypnea, or rapid breathing, is not a typical adverse effect of anticholinergic medications. While anticholinergic drugs can affect respiratory secretions and cause drying of mucous membranes, leading to potential respiratory issues, tachypnea specifically is not commonly associated with their use.
D) Hypotension:
Anticholinergic drugs are more likely to cause hypertension rather than hypotension. By blocking the parasympathetic nervous system, these medications can lead to sympathetic dominance, resulting in increased blood pressure. Hypotension is not a typical adverse effect of anticholinergic drugs.
Correct Answer is ["32"]
Explanation
Find the concentration of heparin in the solution:
Total heparin (units): 25,000 units
Volume of solution (mL): 500 mL
Heparin concentration (units/mL) = Total heparin (units) / Volume of solution (mL)
Heparin concentration (units/mL) = 25,000 units / 500 mL = 50 units/mL
Set up the flow rate equation:
Desired heparin infusion rate (units/hr): 1600 units/hr
Heparin concentration in solution (units/mL): 50 units/mL
Flow rate (mL/hr): We need to solve for this
Flow rate (mL/hr) = Desired heparin infusion rate (units/hr) / Heparin concentration (units/mL)
Calculate the flow rate (mL/hr):
Flow rate (mL/hr) = 1600 units/hr / 50 units/mL = 32 mL/hr (round to nearest whole number as requested)
Therefore, the nurse should set the IV pump to deliver approximately 32 mL/hr.
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