Telemetry monitoring indicates asystole. The nurse finds the patient not breathing with no palpable carotid pulse. What is the nurse's initial action?

A. Erythrocyte count: The red blood cell count reflects oxygen-carrying capacity and anemia but does not indicate platelet destruction or immune-mediated reactions. HIT specifically affects platelets, so monitoring erythrocytes would not detect this complication.

B. Fibrinogen degradation products: Fibrinogen degradation products (FDPs) are elevated in disseminated intravascular coagulation or significant clot breakdown. While they reflect fibrinolytic activity, they are not specific or sensitive for heparin-induced thrombocytopenia.

C. Activated partial thromboplastin time (aPTT): Although aPTT is used to monitor therapeutic anticoagulation during heparin infusion, frequent platelet counts are the most direct laboratory marker for HIT. Monitoring aPTT ensures the patient is within the therapeutic range, but detection of a sudden drop in platelet count is crucial for early recognition of HIT.

D. Prothrombin time (PT): PT evaluates the extrinsic coagulation pathway and is primarily used to monitor warfarin therapy. It is not sensitive to heparin therapy or the development of HIT, which involves immune-mediated platelet activation and thrombocytopenia rather than changes in PT.

A. Stable ECG readings: A stable ECG indicates that cardiac electrical activity is not currently showing acute arrhythmias or ischemic changes. While important to monitor, it does not directly reflect the severity of shock or organ perfusion, and immediate reporting is less urgent than evidence of worsening end-organ function.

B. Decreasing lactate levels: Lactate levels reflect tissue hypoperfusion and anaerobic metabolism. A decreasing trend suggests improving perfusion, which is favorable and does not require urgent reporting. It indicates that current interventions may be effective in reversing shock.

C. Increasing creatinine levels: Rising creatinine indicates declining renal function, often secondary to hypoperfusion in shock. Acute kidney injury is a critical complication of worsening shock, signaling inadequate tissue perfusion and potential multi-organ failure. Immediate reporting allows the provider to intervene promptly with fluid resuscitation, vasopressors, or other measures to prevent further organ damage.

D. Elevated hemoglobin levels: High hemoglobin may indicate hemoconcentration due to dehydration, but it is less immediately critical than evidence of end-organ dysfunction. While it should be monitored, it does not reflect acute deterioration in perfusion like rising creatinine does.