[Early detection of hypoxia with BIS monitoring during percutaneous cardiopulmonary support]

Area of Science:

• Cardiology
• Neurology
• Critical Care Medicine

Background:

• Percutaneous cardiopulmonary bypass (PCPS) is a life support technique used for patients with cardiogenic shock post-cardiac surgery.
• Maintaining adequate oxygenation during PCPS is critical, particularly when pulse pressure is near zero and pulse oximetry is unreliable.

Observation:

• A 7-year-old boy on PCPS experienced undetectable pulse oximetry signals and a gradual decrease in bispectral index (BIS) values.
• Darkening of blood in the PCPS circuit and severe hypoxia confirmed by blood gas analysis were observed.
• BIS values dropped significantly, with the suppression ratio (SR) increasing, indicating potential near circulatory arrest.

Findings:

• Bispectral index (BIS) monitoring effectively detected severe hypoxia that was otherwise overlooked.
• BIS values correlated with the patient's circulatory status, particularly cerebral perfusion.
• The bispectral index served as a valuable tool for assessing oxygenation during PCPS when other methods failed.

Implications:

• BIS monitoring can enhance patient safety during PCPS by providing real-time insights into oxygenation and brain perfusion.
• This case highlights the utility of BIS in detecting critical events like hypoxia in complex cardiovascular support scenarios.
• Integrating BIS monitoring into PCPS protocols may improve outcomes for high-risk surgical patients.