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?

B. Assessing the client's vital signs, including blood pressure and pulse, provides critical information about the client's hemodynamic status and response to the new rhythm. Atrial fibrillation can lead to rapid, irregular heart rates and hemodynamic instability, so obtaining vital signs promptly helps the nurse determine the severity of the situation and whether immediate intervention is needed.

A. This action is not the priority when the nurse observes a new onset of atrial fibrillation. While beta- blockers such as metoprolol may be part of the client's long-term management for heart failure and atrial fibrillation, initiating medication administration without further assessment could delay appropriate intervention for the acute change in rhythm.

C. While it is important to communicate changes in the client's condition to the healthcare provider, this action should occur after the nurse has assessed the client's vital signs and determined the urgency of the situation. If the client is stable and responsive to initial interventions, the nurse can then contact the healthcare provider to discuss the new onset of atrial fibrillation and collaborate on further management.

D. Documenting the changes in the client's rhythm is important for continuity of care and communication among healthcare team members. However, obtaining a rhythm strip should not be the first action when a new onset of atrial fibrillation is observed. Assessing the client's vital signs and initiating appropriate interventions to address any hemodynamic instability take precedence.

B. Muffled heart sounds, often described as distant or indistinct, are classic findings in cardiac tamponade. The accumulation of fluid in the pericardial sac dampens the transmission of sound from the heart to the chest wall, resulting in muffled heart sounds on auscultation. This finding is known as Beck's triad, which also includes hypotension and jugular venous distention.

A. Bradycardia is not a typical finding in cardiac tamponade. In fact, tachycardia is more commonly observed due to the compensatory response to decreased cardiac output and decreased stroke volume. The sympathetic nervous system is activated, leading to an increase in heart rate as a compensatory mechanism to maintain cardiac output.

C. Flattened neck veins are not consistent with cardiac tamponade. In cardiac tamponade, jugular venous distention (JVD) is typically observed due to increased venous pressure resulting from impaired right ventricular filling. The presence of JVD is an important clinical finding in cardiac tamponade and can help differentiate it from other causes of shock.

D. Sudden lethargy can occur in various medical emergencies, including cardiac tamponade, but it is not a specific or diagnostic finding for this condition. In cardiac tamponade, symptoms may include dyspnea, chest pain, hypotension, and signs of decreased cardiac output such as cool extremities and altered mental status. However, sudden lethargy alone may not be specific enough to confirm cardiac tamponade.