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Vacuum assisted venous drainage (VAVD).

K Münster¹, U Andersen, J Mikkelsen

¹University of Copenhagen and Hamlet Private Hospital.

|December 10, 1999

Summary

Vacuum-assisted venous drainage improves blood flow during cardiac surgery. This novel system enhances safety and efficiency, leading to better patient outcomes with less fluid required.

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Area of Science:

Cardiovascular Surgery
Medical Devices
Hemodynamics

Background:

Poor venous drainage poses challenges in cardiac surgery, particularly with minimally invasive approaches requiring smaller venous catheters.
Existing methods can be limited by catheter size and patient positioning, impacting surgical efficiency and patient safety.

Purpose of the Study:

To evaluate the function, safety, and benefits of a vacuum-assisted venous drainage system for cardiac surgery.
To characterize the system's performance in vitro and assess its clinical applicability.

Main Methods:

Developed and tested a vacuum regulator system ('The Hamlet box') with safety procedures.
Performed in vitro characterization of vacuum, catheter size, blood temperature, and flow.
Conducted a clinical study involving 54 adult patients undergoing coronary artery bypass graft and valve operations using bi-caval venous cannulation with 24 Fr catheters.

Main Results:

The vacuum-assisted venous drainage system demonstrated adequate venous drainage irrespective of heart position.
Perfusion was event-free, with the system being easy to manage and regulate.
Significantly less fluid was required (median 250 ml vs. 1000 ml in controls), with no increased hemolysis or adverse effects observed.

Conclusions:

Vacuum-assisted venous drainage is a safe and effective method for improving venous drainage in cardiac surgery.
The system facilitates easier management and regulation, leading to improved patient outcomes and reduced fluid administration.
Routine clinical use is established, with ongoing research to further develop the system and explore physiological effects.

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