A nurse is caring for a client admitted to the intensive care unit for a cardiac dysrhythmia. The nurse understands the prescribed calcium channel blocker has which of the following mechanisms of action?
Acts on the beta cells within the heart and lungs to regulate cardiac rhythm
Increases heart rate and increases myocardial contractility
Reduces the contractility and conductivity of the heart
Increase oxygen to the systemic circulation
The Correct Answer is C
A) "Acts on the beta cells within the heart and lungs to regulate cardiac rhythm.": This statement is incorrect because calcium channel blockers do not primarily act on beta cells. Instead, they block calcium channels in cardiac and smooth muscle, which affects heart contractility and conductivity.
B) "Increases heart rate and increases myocardial contractility.": Calcium channel blockers typically do the opposite; they decrease heart rate and myocardial contractility by inhibiting calcium entry into the heart muscle cells. Therefore, this statement does not accurately describe their mechanism of action.
C) "Reduces the contractility and conductivity of the heart.": This statement accurately reflects the action of calcium channel blockers. By blocking calcium entry, these medications decrease myocardial contractility and slow down electrical conduction through the heart, which can help manage dysrhythmias.
D) "Increase oxygen to the systemic circulation.": While calcium channel blockers can improve blood flow and reduce myocardial oxygen demand by decreasing heart workload, their primary action does not directly focus on increasing oxygen delivery to systemic circulation. Their primary role is in managing heart contractility and rhythm.
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Correct Answer is ["A","B","C","D","E"]
Explanation
A) Angioedema: Quinapril, an ACE inhibitor, can cause angioedema, which is a serious allergic reaction characterized by swelling of the deeper layers of the skin. This side effect is critical to monitor, as it can lead to airway obstruction.
B) Dry non-productive cough: A persistent dry cough is a well-known side effect of ACE inhibitors like quinapril. This occurs due to the accumulation of bradykinin and can be bothersome enough to require discontinuation of the medication.
C) Hyperkalemia: Quinapril can lead to increased potassium levels in the blood, a condition known as hyperkalemia. This is due to the drug's mechanism of action, which reduces aldosterone secretion, leading to decreased potassium excretion.
D) First dose phenomenon: This refers to a significant drop in blood pressure following the first dose of an ACE inhibitor, which can lead to dizziness or fainting. Patients are often advised to take the first dose at bedtime to minimize this risk.
E) Hypotension: Quinapril can cause hypotension, particularly after the initial dosing or in patients who are dehydrated or on diuretics. It’s important for patients to be aware of this potential side effect.
F) Hypertension: Quinapril is used to treat hypertension, so it is not a side effect associated with this medication. Instead, the goal of treatment is to lower blood pressure, making this option incorrect.
Correct Answer is ["C","D","E","F"]
Explanation
A) Constipation: While constipation can occur with digoxin use, it is not a classic sign of digoxin toxicity. Therefore, it is less critical for the client to monitor this symptom specifically in relation to toxicity.
B) Dark red urine: Dark red urine is not typically associated with digoxin toxicity. This symptom could indicate other conditions, such as blood in the urine or issues with the kidneys, but it is not a direct manifestation of digoxin toxicity.
C) Bradycardia: Digoxin toxicity can lead to bradycardia, characterized by a slower than normal heart rate. The client should be instructed to monitor their pulse and report any significant changes, especially if the heart rate drops below 60 beats per minute.
D) Nausea: Nausea is a common symptom of digoxin toxicity. Clients should be aware of this and report any persistent or severe nausea, as it may indicate that the digoxin levels in their system are too high.
E) Vomiting: Vomiting is another classic sign of digoxin toxicity. Clients should be instructed to report any episodes of vomiting, as this can further complicate their condition and may require adjustment of their medication.
F) Anorexia: Anorexia, or loss of appetite, can also occur with digoxin toxicity. Clients should be advised to monitor their appetite and report any significant changes, as this can be an early indicator of toxicity.