A client is admitted to the critical care unit (CCU) with a third degree complete heart block. A temporary transvenous pacemaker is inserted by the healthcare provider (HCP). An hour after pacemaker insertion, the device stops sensing the client's intrinsic heart rate. Which action should the nurse implement first?

A. Normal sinus rhythm (NSR) at 84 beats/minute. The goal of cardioversion for atrial fibrillation (AFib) is to restore a normal sinus rhythm (NSR). NSR indicates that the atria and ventricles are depolarizing in a coordinated manner, reducing the risk of thromboembolism, stroke, and hemodynamic instability. A heart rate of 84 beats/minute is within the normal range, confirming the success of the procedure.
B. Regular rhythm with consistent pacemaker capture. Cardioversion is used to restore normal rhythm in AFib, not to manage pacemaker function. A pacemaker is not part of standard AFib cardioversion unless the client has underlying conduction issues requiring pacing.
C. Return of elevated ST segment to the baseline. ST elevation suggests acute myocardial infarction (MI), which is unrelated to atrial fibrillation or cardioversion. Cardioversion does not treat ST elevation or myocardial ischemia, making this an incorrect indicator of success.
D. Increased frequency of QRS complexes. An increase in QRS frequency suggests tachycardia, which would indicate treatment failure rather than success. The goal of cardioversion is to restore a normal, controlled heart rate and rhythm, not to increase the number of ventricular contractions.

A. Respiratory rate of 26 breaths/minute. A respiratory rate ≥22 breaths/minute meets the SIRS criteria and indicates systemic inflammation or respiratory distress. In pneumonia, increased breathing effort may result from hypoxia or infection-related metabolic demands. Persistent tachypnea suggests worsening sepsis and requires urgent intervention.
B. Heart rate of 112 beats/minute. A heart rate ≥90 beats/minute is a SIRS criterion, often caused by infection, hypoxia, or systemic inflammation. In pneumonia, tachycardia may result from fever, pain, or compensatory mechanisms due to decreased oxygenation. An elevated heart rate in sepsis may indicate progressing hemodynamic instability.
C. Temperature of 96.1° F (35.6°C). Hypothermia (<96.8°F/36°C) is a SIRS criterion and may indicate severe sepsis or systemic inflammatory response. While fever is a common response, low temperature suggests immune system dysfunction. Hypothermia in sepsis is linked to poor prognosis and increased mortality risk.
D. White blood count of 14,000/mm³ (14 x 10⁹/L). A WBC >12,000/mm³ or <4,000/mm³ meets SIRS criteria and indicates infection-related immune activation. Elevated WBCs suggest an active inflammatory response to pneumonia. A rising WBC count may indicate worsening infection or ineffective immune control.
E. Hemoglobin of 12.8 gram/dL (7.94 mmol/L). Hemoglobin levels within the normal range (12-16 g/dL) do not indicate SIRS or sepsis progression. While anemia can develop in chronic illness or bleeding, this value does not contribute to SIRS classification. Monitoring oxygenation and perfusion is more relevant in pneumonia cases.