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 D
Explanation
A) "This medication decreases chest pain by dissolving blood clots that are occluding the arteries.": This statement is incorrect because nitroglycerin does not dissolve blood clots. Instead, it works by relaxing and dilating blood vessels, which helps improve blood flow to the heart muscle and relieve angina.
B) "Place one tablet under your tongue every 15 minutes and repeat up to 5 times for relief of chest pain.": This is not accurate; while nitroglycerin can be taken sublingually, the typical recommendation is to take one tablet every 5 minutes as needed for chest pain, not every 15 minutes, and not to exceed 3 tablets within 15 minutes.
C) "This medication is the first-line treatment for hypertension.": Although nitroglycerin can lower blood pressure, it is not typically considered a first-line treatment for hypertension. It is primarily used for angina relief rather than as a primary antihypertensive agent.
D) "This medication dilates cardiac blood vessels to deliver more oxygen to the heart.": This statement accurately describes the action of nitroglycerin. By dilating the coronary arteries, nitroglycerin increases blood flow and oxygen delivery to the heart muscle, which helps alleviate angina symptoms. This is a key point to emphasize during patient education.
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.