Miniaturized cardiopulmonary bypass: the Hammersmith technique.

Area of Science:

• Cardiovascular Surgery
• Medical Devices
• Biomedical Engineering

Background:

• Conventional cardiopulmonary bypass (cCPB) can trigger systemic inflammation, hemodilution, coagulopathy, and organ failure.
• Miniaturized cardiopulmonary bypass (mCPB) presents a potential solution to mitigate these adverse effects.
• The diversity in mCPB technologies complicates its widespread adoption.

Purpose of the Study:

• To describe a standardized 'Hammersmith' mCPB technique for adult cardiac operations.
• To demonstrate the safety and reproducibility of mCPB.
• To balance the benefits of miniaturization with patient safety.

Main Methods:

• A standardized 'Hammersmith' mCPB technique was applied in 184 consecutive adult cardiac operations.
• The technique involves optimizing venous drainage, managing venous collapse pressure, and enhancing patient-prime interaction.
• Antegrade and retrograde autologous priming were used to mix blood and prime away from tissues.

Main Results:

• The Hammersmith mCPB technique was successfully used in various adult cardiac surgeries, including major aortic procedures.
• Clinical experience indicated optimal venous drainage via kinetic energy and controlled venous collapse pressure.
• Optimized patient-prime interaction with autologous priming reduced oncotic destabilization.

Conclusions:

• The Hammersmith mCPB is a next-generation system utilizing standard components.
• It maintains safety margins while offering the benefits of miniaturization.
• The technique aims to reduce human factor demands in cardiac surgery.