A nurse is caring for a patient who underwent cardiac surgery 24 hours ago. The patient reports chest pain, shortness of breath, and has decreased urine output. On assessment, the nurse notes hypotension and tachycardia. What is the most appropriate initial nursing intervention?

A patient 24 hours post-cardiac surgery presents with a classic triad of chest pain, shortness of breath, and oliguria, accompanied by vital sign changes of hypotension and tachycardia. This presentation is a medical emergency requiring immediate provider notification, not independent nursing interventions for abdominal complications.

• Cardiovascular: Hypotension, tachycardia, possible narrowed pulse pressure, chest pain.
• Respiratory: Shortness of breath, tachypnea, crackles, hypoxia.
• Renal: Decreased urine output (oliguria, less than 0.5 mL/kg/hr).
• Peripheral: Cool, clammy skin, delayed capillary refill, altered mental status.

1. Immediate Provider Notification: Report the full clinical picture using SBAR communication. This is the most critical initial action.
2. Hemodynamic Support: Prepare for potential interventions such as fluid resuscitation (with caution), initiation or titration of inotropic/vasopressor medications (e.g., dobutamine, milrinolone, norepinephrine) as prescribed.
3. Optimize Oxygenation: Apply oxygen to maintain SpO2, and prepare for possible non-invasive or mechanical ventilation if respiratory failure is imminent.
4. Continuous Monitoring: Closely monitor vital signs, cardiac rhythm, intake and output, and oxygen saturation every 5-15 minutes.
5. Diagnostic Preparation: Anticipate and prepare for a 12-lead ECG, chest X-ray, echocardiogram, and laboratory tests (cardiac enzymes, ABG, lactate, electrolytes).

While LCOS is the most likely diagnosis, the nurse must also consider other postoperative complications that present similarly, including cardiac tamponade, acute graft failure, pulmonary embolism, and tension pneumothorax. The immediate response is the same: rapid recognition and escalation of care.