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 A

Explanation

A The first intervention should be to ensure adequate oxygenation, as hypoxia can exacerbate shock. Therefore, providing oxygen at 100% via a non-rebreather mask is the most critical initial step. This intervention helps to maximize the amount of oxygen delivered to the patient's lungs and subsequently to the rest of the body, supporting vital organ function while further assessments and interventions are prepared.

B Continuous ECG monitoring allows for the assessment of the patient's heart rhythm, rate, and any signs of dysrhythmias or cardiac ischemia. This intervention is important for detecting any life- threatening arrhythmias, such as ventricular tachycardia or fibrillation, which may require immediate intervention. While ECG monitoring is important, it may not be the highest priority intervention.

C Drawing blood for type and crossmatch is important for preparing for potential blood transfusions if significant blood loss is suspected. However, this intervention may take some time to process, and immediate stabilization of the patient's condition is paramount.

D Large-bore IV catheters allow for rapid infusion of fluids to restore intravascular volume and improve tissue perfusion. This intervention is critical for stabilizing the patient's hemodynamic status and takes precedence in the management of shock. However, oxygenation should take priority.

A. Nitroglycerin B. Metoprolol C. Furosemide D. Epinephrine

Correct Answer is A

Explanation

A. Nitroglycerin is a vasodilator commonly used to reduce preload and afterload in critical care settings. By dilating blood vessels, nitroglycerin decreases systemic vascular resistance (afterload), which reduces the workload on the heart and improves cardiac output. It is often used to manage conditions such as acute heart failure, hypertensive emergencies, and acute coronary syndromes.

B. Metoprolol is a beta-blocker that primarily acts to reduce heart rate and myocardial contractility. While it can indirectly reduce afterload by lowering blood pressure, its primary mechanism of action is not targeted at afterload reduction. Metoprolol is commonly used in critical care for various indications, including hypertension, myocardial infarction, and heart failure, but it is not primarily used for afterload reduction.

C. Furosemide is a loop diuretic commonly used to manage volume overload and reduce preload in critical care settings. By promoting diuresis, furosemide decreases circulating blood volume, venous return, and preload, which indirectly reduces afterload. However, its primary mechanism of action is not targeted at afterload reduction but rather at reducing volume overload.

D. Epinephrine is a potent sympathomimetic agent that acts on alpha and beta-adrenergic receptors. While it can increase systemic vascular resistance (afterload) at higher doses due to its alpha-adrenergic effects, it is not commonly used for afterload reduction in critical care settings. Epinephrine is primarily used as a vasopressor to increase blood pressure and cardiac output in patients with shock or cardiac arrest.

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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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