A nurse is caring for a client with a ventricular pacemaker who is on ECG monitoring. The nurse understands that the pacemaker is functioning properly when which of the following appears on the monitor strip?

Pacemaker spikes before each QRS complex

Pacemaker spikes after each QRS complex

Pacemaker spikes before each P wave

Pacemaker spikes with each T wave

Answer and Explanation

The Correct Answer is A

A. Pacemaker spikes before each QRS complex: This is the correct answer. In a client with a ventricular pacemaker, the pacemaker spikes should precede each QRS complex on the ECG strip. This indicates that the pacemaker is appropriately stimulating the ventricles to depolarize and initiate a heartbeat. The

presence of pacemaker spikes before each QRS complex signifies that the pacemaker is functioning properly and effectively pacing the ventricles.

B. Pacemaker spikes occurring after each QRS complex would suggest a malfunction or inappropriate timing of the pacemaker. In this scenario, the pacemaker would not be pacing the ventricles as intended. This would be an abnormal finding and would require further assessment and intervention.

C. Pacemaker spikes preceding each P wave would suggest pacing of the atria rather than the ventricles. This would indicate a different type of pacemaker (atrial pacemaker) or inappropriate pacing settings for a ventricular pacemaker. In either case, it would be considered abnormal for a ventricular pacemaker and would require evaluation and possibly reprogramming of the pacemaker.

D. Pacemaker spikes occurring with each T wave would be an abnormal finding and would suggest interference or oversensing by the pacemaker. This could lead to inappropriate pacing or dysrhythmias. It would require further investigation and correction to ensure proper pacemaker function.

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Correct Answer is B

Explanation

B. Sodium nitroprusside is a potent vasodilator used to reduce systemic vascular resistance and afterload, thereby improving cardiac output and tissue perfusion in cardiogenic shock. In this scenario, where the patient has cool and clammy skin with high SVR, indicating peripheral vasoconstriction,

increasing the rate of sodium nitroprusside infusion can help vasodilate peripheral vessels, reduce afterload, and improve tissue perfusion

A. Dopamine is a medication commonly used in the management of cardiogenic shock to increase cardiac output and systemic blood pressure. However, in this scenario where the patient is cool and clammy with high SVR, indicating vasoconstriction and potential peripheral hypoperfusion, increasing the rate of dopamine infusion may further increase systemic vascular resistance and exacerbate peripheral vasoconstriction. This can worsen tissue perfusion and exacerbate the patient's condition.

C. Nitroglycerin is another vasodilator commonly used in the management of cardiogenic shock to reduce preload and afterload, thereby improving cardiac output and tissue perfusion. However, decreasing the rate of nitroglycerin infusion may further exacerbate vasoconstriction and increase SVR, worsening tissue perfusion in this scenario. Therefore, decreasing the rate of nitroglycerin infusion is not indicated.

D. Intravenous fluids such as 5% dextrose in normal saline are typically administered to maintain adequate intravascular volume and perfusion pressure in shock states. However, decreasing the rate of intravenous fluid infusion may further decrease intravascular volume and preload, potentially exacerbating hypoperfusion and worsening the patient's condition. Therefore, decreasing the rate of intravenous fluid infusion is not indicated in this scenario.

A. Atorvastatin B. Metformin C. Carvedilol D. Nitroglycerin

Correct Answer is B

Explanation

B Metformin is an oral antidiabetic medication commonly used to treat type 2 diabetes. There is a potential risk of lactic acidosis when metformin is used in conjunction with contrast material, particularly in patients with underlying renal impairment. Contrast-induced nephropathy can exacerbate renal dysfunction, leading to increased levels of metformin and potentially increasing the risk of lactic acidosis. Therefore, metformin use before or after contrast administration should be carefully monitored, and in some cases, temporarily discontinued to reduce the risk of lactic acidosis.

A Atorvastatin is a statin medication commonly used to lower cholesterol levels. It does not have a direct interaction with contrast material used in cardiac catheterization. Therefore, it does not place the client at risk for acute kidney injury related to contrast-induced nephropathy (CIN).

C Carvedilol is a beta-blocker medication used to treat high blood pressure and heart failure. It does not have a direct interaction with contrast material used in cardiac catheterization. Therefore, it does not place the client at risk for acute kidney injury related to contrast-induced nephropathy (CIN).

D Nitroglycerin is a medication commonly used to relieve chest pain (angina) in patients with coronary artery disease. It does not have a direct interaction with contrast material used in cardiac catheterization. Therefore, it does not place the client at risk for acute kidney injury related to contrast- induced nephropathy (CIN).

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A nurse is caring for a client with a ventricular pacemaker who is on ECG monitoring. The nurse understands that the pacemaker is functioning properly when which of the following appears on the monitor strip?

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Naxlex Comprehensive Predictor Exams

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