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Low-dose preoperative aspirin therapy, postoperative blood loss, and transfusion requirements
D P Taggart1, A Siddiqui, D J Wheatley
1Department of Cardiac Surgery, Royal Infirmary, Glasgow, Scotland.
Insights
Preoperative aspirin therapy, even at low doses, significantly increases blood loss and transfusion needs after coronary artery bypass grafting. However, it does not extend hospital stays for these patients.
Area of Science:
- Cardiology
- Anesthesiology
- Pharmacology
Background:
- Preoperative aspirin use is common in patients undergoing coronary artery bypass grafting (CABG).
- The impact of low-dose aspirin regimens on perioperative outcomes requires further clarification.
Purpose of the Study:
- To evaluate the effect of three low-dose aspirin regimens (75 mg, 150 mg, 300 mg daily) on postoperative blood loss, transfusion requirements, and hospital stay in patients undergoing elective CABG.
Main Methods:
- Prospective cohort study involving 202 patients undergoing elective CABG.
- Comparison between 101 patients on daily aspirin (various doses) and 101 control patients not on aspirin.
- Data collected on postoperative blood loss, red blood cell concentrate transfusions, hemostatic pack usage, and length of hospital stay.
Main Results:
- Aspirin therapy significantly increased median postoperative blood loss across all tested doses compared to controls.
- Blood transfusion requirements and the need for hemostatic packs (fresh frozen plasma, platelets, cryoprecipitate) were significantly higher in patients taking aspirin.
- Mean postoperative hospital stay remained similar across all groups, averaging 8 days.
Conclusions:
- Regular daily low-dose aspirin therapy is associated with increased postoperative blood loss and transfusion requirements in CABG patients.
- Despite increased bleeding and transfusion needs, aspirin therapy did not prolong the length of hospital stay.
- These findings suggest a need for careful consideration of preoperative aspirin use in cardiac surgery patients.
Abstract:
The effects of three low-dose regimens of preoperative aspirin therapy on postoperative blood loss, transfusion requirements, and length of hospital stay were recorded in a prospective cohort study of 202 patients undergoing elective coronary artery bypass grafting. One hundred one patients had been prescribed daily aspirin by the referring cardiologist (44 at 75 mg, 28 at 150 mg, and 29 at 300 mg); the remaining 101 patients who had not been prescribed aspirin acted as a control group. A median postoperative blood loss of 870 mL in the control group was increased by 280 mL in the 75-mg aspirin group (p less than 0.001), by 490 mL in the 150-mg aspirin group (p less than 0.001), and by 230 mL in the 300-mg aspirin group (p = 0.03). The median requirement for blood transfusion of 2 U red blood cell concentrates in the control group was increased by 2 U in the 75-mg aspirin group (p less than 0.001), 2 U in the 150-mg aspirin group (p less than 0.001), and 1 U in the 300-mg aspirin group (p = 0.05). Hemostatic "packs" (fresh frozen plasma, platelets, and cryoprecipitate) were required in 20 patients in the aspirin groups as compared with 5 in the control group (p less than 0.01 by chi 2 test). The mean postoperative hospital stay was 8 days for all groups. Regular daily low-dose aspirin therapy produces significant increases in postoperative blood loss, resulting in a substantial increase in blood transfusion and hemostatic pack requirements, but does not prolong postoperative hospital stay.