Blood conservation in small adults undergoing valve surgery

Area of Science:

• Cardiovascular Surgery
• Transfusion Medicine
• Anesthesiology

Background:

• Cardiac valve surgery often requires significant blood transfusions.
• Patients in India, particularly those with rheumatic heart disease, are often anemic and have lower body weights, posing unique challenges for blood conservation.
• Previous studies on blood conservation have primarily focused on coronary artery bypass grafting.

Purpose of the Study:

• To assess the efficacy of different blood conservation methods in anemic, low-body-weight patients undergoing cardiac valve surgery.
• To compare the transfusion requirements between strategies involving autologous blood, cell saver, and membrane oxygenators versus standard practices.

Main Methods:

• A prospective, randomized study involving 150 patients undergoing elective valve surgery with cardiopulmonary bypass.
• Patients were divided into three groups: Group 1 (autologous fresh blood, cell saver, membrane oxygenator), Group 2 (autologous blood reinfusion only), and Group 3 (control).
• Transfusion was indicated if postoperative hematocrit fell below 25%.

Main Results:

• Group 1 required significantly fewer units of bank blood (15 units) compared to Group 2 (90 units) and Group 3 (102 units) (p < 0.001).
• Seventy-eight percent of patients in Group 1 avoided donor blood transfusions.
• No significant difference in chest tube drainage was observed among the groups.

Conclusions:

• In anemic, low-body-weight patients undergoing cardiac valve surgery, autologous blood alone is insufficient to reduce blood bank requirements.
• The combination of autologous blood, a cell saver, and a membrane oxygenator is highly effective in reducing the need for donor blood transfusions in this specific patient population.