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 C
Explanation
A) Migraine headache: While migraines can be uncomfortable and distressing, they are not a known serious side effect of atorvastatin. Clients may experience headaches, but this symptom does not typically require immediate reporting unless accompanied by other concerning signs.
B) Bradycardia: Bradycardia, or a slow heart rate, is not a common side effect of atorvastatin. While monitoring heart rate is important, bradycardia alone does not necessitate immediate reporting unless it leads to significant symptoms or complications.
C) Dark-red urine: Dark-red urine is a concerning finding that could indicate serious conditions, such as hematuria or rhabdomyolysis, particularly when associated with statin use. This symptom requires immediate reporting to the healthcare provider, as it may signify potential muscle breakdown or kidney issues, which are serious complications of atorvastatin therapy.
D) Elevated HDL cholesterol: Increased levels of HDL (high-density lipoprotein) cholesterol are generally considered beneficial and a positive outcome of treatment. Therefore, this finding would not necessitate immediate reporting to the healthcare provider.
Correct Answer is C
Explanation
A) Platelet counts: Monitoring platelet counts is not necessary with atorvastatin therapy. While certain medications may affect platelet levels, atorvastatin primarily targets lipid levels and does not have a significant impact on platelet function.
B) Lung function test: Lung function tests are not relevant for atorvastatin use. These tests are typically utilized for assessing respiratory conditions and are not part of the routine monitoring for cholesterol-lowering medications.
C) Liver function test: Atorvastatin can affect liver function, so it is essential to monitor liver
enzymes (such as AST and ALT) regularly. Routine liver function tests help identify any potential hepatotoxicity early, allowing for timely intervention if liver function declines.
D) Bun and creatinine levels: While monitoring renal function can be important in some contexts, it is not a routine requirement specifically for atorvastatin. However, it may be necessary in certain patient populations or if there are concerns about kidney function, but liver function tests are the primary focus with this medication.