Calculated vs Reality: The CPB Balancing Act

Is Continuous In-Line Blood Gas Monitoring Reliable During Cardiopulmonary Bypass When PaO2 and PaCO2 Are Calculated Rather Than Measured?

March 17, 2026 No Comments

This study evaluates the accuracy of calculated versus measured blood gas values during cardiopulmonary bypass using the Quantum System. In 81 patients, calculated PaO2 was significantly overestimated before calibration and during rewarming, often exceeding acceptable error limits. PaCO2 performed better but drifted with temperature changes. Findings highlight limitations of formula-based monitoring and emphasize the need for calibration and cautious interpretation.

Suction Flow and Reservoir Levels Driving Microemboli During Cardiopulmonary Bypass

The Effect of Surgical Field Suction Flow Rate and Venous Reservoir Levels on Gaseous Microemboli Transmission

March 17, 2026 No Comments

This in vitro study investigated how suction flow rate and venous reservoir level influence gaseous microemboli (GME) during cardiopulmonary bypass. Using a mock CPB circuit with bovine blood, higher suction speeds and lower reservoir levels significantly increased GME transmission. The interaction between these variables was strongest at the venous line, while arterial filtration reduced but did not eliminate emboli.

Dry Venous Line Initiation and Microemboli Formation in Cardiopulmonary Bypass

Initiating Cardiopulmonary Bypass Using a Dry Venous Line: Implications and Analysis

March 17, 2026 No Comments

This experimental study evaluated the effects of initiating cardiopulmonary bypass (CPB) with a dry venous line using vacuum-assisted venous drainage (VAVD). Researchers compared gaseous microemboli (GME) production with traditional primed venous lines. Results showed significantly higher GME counts and volumes with dry venous lines, particularly at higher vacuum pressures and instant initiation. Lower vacuum levels and delayed initiation reduced GME generation.