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","C","D"]
Explanation
A) Masking of hypoglycemia: Propranolol can mask the symptoms of hypoglycemia, such as tachycardia, which is important for clients with diabetes to be aware of. This means that while they may have low blood sugar, they might not experience the typical warning signs due to the medication's effects on the autonomic nervous system.
B) Tachycardia: Propranolol is a beta-blocker that is used to reduce heart rate and blood pressure. Therefore, tachycardia is not a side effect associated with this medication; in fact, it generally works to prevent this condition.
C) Bradycardia: Bradycardia, or a slow heart rate, is a common side effect of propranolol due to its action on beta-adrenergic receptors. Clients should be educated about monitoring their heart rate and reporting any significant drops.
D) Orthostatic Hypotension: This is a potential side effect of propranolol, especially when starting the medication or increasing the dose. Clients should be advised to rise slowly from sitting or lying positions to minimize the risk of dizziness or fainting.
E) Hypertension: Propranolol is prescribed to manage hypertension, so it should not be expected as a side effect. In fact, it is intended to lower blood pressure, and clients should be educated that they should not experience increased hypertension while taking this medication.
Correct Answer is A
Explanation
A) Gallstones: Gemfibrozil is associated with an increased risk of gallstones. This medication can alter the metabolism of lipids and bile, potentially leading to the formation of gallstones. Clients should be monitored for symptoms such as abdominal pain or discomfort that could indicate gallbladder issues.
B) Decreased PT time: Gemfibrozil does not typically affect prothrombin time (PT). Instead, it may interact with anticoagulants and potentially increase PT time, requiring careful monitoring in patients taking both medications.
C) Hyperkalemia: While hyperkalemia can occur with certain lipid-lowering medications, it is not a common side effect associated with gemfibrozil. This drug primarily affects triglycerides and cholesterol levels without significantly impacting potassium levels.
D) Increased creatinine clearance: Gemfibrozil is not known to increase creatinine clearance; in fact, it can sometimes affect renal function. Monitoring kidney function is important, but increased creatinine clearance is not an expected outcome with this medication.