Reexpansion Pulmonary Edema After Thoracentesis Post-CABG and Mitral Valve Surgery: A Case Report

Reexpansion pulmonary edema following postoperative thoracentesis after combined coronary artery bypass grafting and mitral valve surgery represents a rare but severe clinical complication documented in recent medical literature. According to a case report published in the journal Cureus on August 23, 2026, this acute condition develops when fluid is removed from the pleural space following cardiothoracic operations, leading to rapid lung expansion and subsequent non-cardiogenic fluid accumulation.

Clinical Presentation of Postoperative Thoracentesis Complications

Medical documentation of the case details how a patient undergoing combined coronary artery bypass grafting and mitral valve surgery later required thoracentesis to drain postoperative pleural effusion. Following the procedure, the patient experienced sudden respiratory distress characteristic of reexpansion pulmonary edema. According to the Cureus case report, this phenomenon occurs infrequently in cardiothoracic recovery settings, demanding swift recognition by clinical teams monitoring patients after complex heart operations.

Pleural effusions frequently accumulate following procedures like coronary artery bypass grafting and mitral valve surgery due to surgical trauma, inflammation, and heart failure dynamics. When clinicians perform thoracentesis to relieve respiratory compromise or monitor chest status, rapid evacuation of large fluid volumes can alter intrathoracic pressure dramatically. The sudden negative pressure shift forces fluid across the alveolar-capillary membrane into the lung tissue that has just reexpanded.

Understanding Reexpansion Pulmonary Edema Risks

The exact physiological triggers of reexpansion pulmonary edema involve mechanical stress on pulmonary capillaries, increased vascular permeability, and local ischemia-reperfusion injury during lung deflation and reinflation. While routine thoracentesis remains a standard intervention for managing pleural fluid accumulation in post-surgical patients, the added complexity of a recent combined cardiac operation heightens overall vulnerability. Authors of the Cureus report emphasize that managing postoperative pleural effusions requires careful volume control and vigilant monitoring of pressure changes during drainage.

Treatment protocols for reexpansion pulmonary edema typically focus on supportive respiratory care, supplemental oxygen, and hemodynamic stabilization. Because the condition is non-cardiogenic, management strategies differ from standard heart failure treatments, relying instead on maintaining adequate oxygenation and addressing symptoms as the pulmonary fluid resolves. The documented case serves to remind surgical and critical care teams of the potential risks associated with evacuating pleural fluid too quickly after major thoracic and cardiac procedures.