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Papers by Eugene Delabays

Research paper thumbnail of Evaluation of the performance of Centre Pivot Sprinkler irrigation system and its effects on crop yield at Kagera, Tanzania

Research paper thumbnail of Hemodilution and surgical hemostasis contribute significantly to transfusion requirements in patients undergoing coronary artery bypass

The Journal of Thoracic and Cardiovascular Surgery, 2005

We sought to determine the incidence of and risk factors for the development of low intraoperativ... more We sought to determine the incidence of and risk factors for the development of low intraoperative hematocrit levels and of excessive postoperative bleeding in patients undergoing coronary artery bypass grafting, whether the risk factors are the same, and their effect on blood product transfusions. Methods: We performed a prospective cohort study of 613 adult patients who underwent coronary artery bypass grafting in 3 tertiary, university-affiliated hospitals during the period from October 1, 2000, to March 31, 2001. Results: Low intraoperative hematocrit levels (Ͻ19%) were found in 131 (24%) patients who had operations performed with extracorporeal circulation compared with in 3 (4%) patients with operations performed off pump. In multivariate analysis this was associated with older age, female sex, lower preoperative hemoglobin levels, lower body surface area, longer duration on bypass, and use of higher total volumes with more hydroxyethyl starch in the circuit. Low intraoperative hematocrit levels did not predict excessive postoperative hemorrhage (Ͼ1 L of mediastinal drainage in the first 12 hours). This occurred in 26% (n ϭ 140) of patients undergoing on-pump operations and in 25% of patients undergoing off-pump operations and in multivariate analysis was associated with male sex, longer pump times, not receiving aprotinin, and operations performed by certain surgeons but not with total circuit or hydroxyethyl starch volume. Conclusions: We observed that the risk factors for the development of a low intraoperative hematocrit level and excessive postoperative bleeding differed. Our results suggest that decreasing these outcomes in patients undergoing cardiac surgery requires a comprehensive approach, including limiting hemodilution, particularly in female subjects with lower preoperative hemoglobin levels, and careful attention to surgical hemostasis. P atients who undergo cardiac surgery commonly receive blood product transfusions, but there are substantial and unexplained differences in rates in different institutions. 1,2 Consensus recommendations are to consider intraoperative transfusion of packed cells if the hematocrit level decreases to less than 19% intraoperatively. 3,4 Drainage in excess of 1 L postoperatively is associated with accelerated transfusion of blood products in the order of greater than 5 units. 2,5 Both excessive bleeding and low hematocrit levels are common and associated with worse outcomes, 6-8 yet these have not been well characterized. 2,6 Because of the assumption that risk factors for perioperative blood product transfusions 3,9,10 and for bleeding are the same, preventive strategies have focused on agents promoting or limiting preoperative use of agents that impair hemostasis. 11-14 However, intraoperative anemia might be related to hemodilution, but this has received scant attention. 15-17 It is also unclear whether the substantial differences in blood product

Research paper thumbnail of Hemodilution and surgical hemostasis contribute significantly to transfusion requirements in patients undergoing coronary artery bypass

The Journal of Thoracic and Cardiovascular Surgery, 2005

We sought to determine the incidence of and risk factors for the development of low intraoperativ... more We sought to determine the incidence of and risk factors for the development of low intraoperative hematocrit levels and of excessive postoperative bleeding in patients undergoing coronary artery bypass grafting, whether the risk factors are the same, and their effect on blood product transfusions. We performed a prospective cohort study of 613 adult patients who underwent coronary artery bypass grafting in 3 tertiary, university-affiliated hospitals during the period from October 1, 2000, to March 31, 2001. Low intraoperative hematocrit levels (<19%) were found in 131 (24%) patients who had operations performed with extracorporeal circulation compared with in 3 (4%) patients with operations performed off pump. In multivariate analysis this was associated with older age, female sex, lower preoperative hemoglobin levels, lower body surface area, longer duration on bypass, and use of higher total volumes with more hydroxyethyl starch in the circuit. Low intraoperative hematocrit levels did not predict excessive postoperative hemorrhage (>1 L of mediastinal drainage in the first 12 hours). This occurred in 26% (n = 140) of patients undergoing on-pump operations and in 25% of patients undergoing off-pump operations and in multivariate analysis was associated with male sex, longer pump times, not receiving aprotinin, and operations performed by certain surgeons but not with total circuit or hydroxyethyl starch volume. We observed that the risk factors for the development of a low intraoperative hematocrit level and excessive postoperative bleeding differed. Our results suggest that decreasing these outcomes in patients undergoing cardiac surgery requires a comprehensive approach, including limiting hemodilution, particularly in female subjects with lower preoperative hemoglobin levels, and careful attention to surgical hemostasis.

Research paper thumbnail of Evaluation of the performance of Centre Pivot Sprinkler irrigation system and its effects on crop yield at Kagera, Tanzania

Research paper thumbnail of Hemodilution and surgical hemostasis contribute significantly to transfusion requirements in patients undergoing coronary artery bypass

The Journal of Thoracic and Cardiovascular Surgery, 2005

We sought to determine the incidence of and risk factors for the development of low intraoperativ... more We sought to determine the incidence of and risk factors for the development of low intraoperative hematocrit levels and of excessive postoperative bleeding in patients undergoing coronary artery bypass grafting, whether the risk factors are the same, and their effect on blood product transfusions. Methods: We performed a prospective cohort study of 613 adult patients who underwent coronary artery bypass grafting in 3 tertiary, university-affiliated hospitals during the period from October 1, 2000, to March 31, 2001. Results: Low intraoperative hematocrit levels (Ͻ19%) were found in 131 (24%) patients who had operations performed with extracorporeal circulation compared with in 3 (4%) patients with operations performed off pump. In multivariate analysis this was associated with older age, female sex, lower preoperative hemoglobin levels, lower body surface area, longer duration on bypass, and use of higher total volumes with more hydroxyethyl starch in the circuit. Low intraoperative hematocrit levels did not predict excessive postoperative hemorrhage (Ͼ1 L of mediastinal drainage in the first 12 hours). This occurred in 26% (n ϭ 140) of patients undergoing on-pump operations and in 25% of patients undergoing off-pump operations and in multivariate analysis was associated with male sex, longer pump times, not receiving aprotinin, and operations performed by certain surgeons but not with total circuit or hydroxyethyl starch volume. Conclusions: We observed that the risk factors for the development of a low intraoperative hematocrit level and excessive postoperative bleeding differed. Our results suggest that decreasing these outcomes in patients undergoing cardiac surgery requires a comprehensive approach, including limiting hemodilution, particularly in female subjects with lower preoperative hemoglobin levels, and careful attention to surgical hemostasis. P atients who undergo cardiac surgery commonly receive blood product transfusions, but there are substantial and unexplained differences in rates in different institutions. 1,2 Consensus recommendations are to consider intraoperative transfusion of packed cells if the hematocrit level decreases to less than 19% intraoperatively. 3,4 Drainage in excess of 1 L postoperatively is associated with accelerated transfusion of blood products in the order of greater than 5 units. 2,5 Both excessive bleeding and low hematocrit levels are common and associated with worse outcomes, 6-8 yet these have not been well characterized. 2,6 Because of the assumption that risk factors for perioperative blood product transfusions 3,9,10 and for bleeding are the same, preventive strategies have focused on agents promoting or limiting preoperative use of agents that impair hemostasis. 11-14 However, intraoperative anemia might be related to hemodilution, but this has received scant attention. 15-17 It is also unclear whether the substantial differences in blood product

Research paper thumbnail of Hemodilution and surgical hemostasis contribute significantly to transfusion requirements in patients undergoing coronary artery bypass

The Journal of Thoracic and Cardiovascular Surgery, 2005

We sought to determine the incidence of and risk factors for the development of low intraoperativ... more We sought to determine the incidence of and risk factors for the development of low intraoperative hematocrit levels and of excessive postoperative bleeding in patients undergoing coronary artery bypass grafting, whether the risk factors are the same, and their effect on blood product transfusions. We performed a prospective cohort study of 613 adult patients who underwent coronary artery bypass grafting in 3 tertiary, university-affiliated hospitals during the period from October 1, 2000, to March 31, 2001. Low intraoperative hematocrit levels (<19%) were found in 131 (24%) patients who had operations performed with extracorporeal circulation compared with in 3 (4%) patients with operations performed off pump. In multivariate analysis this was associated with older age, female sex, lower preoperative hemoglobin levels, lower body surface area, longer duration on bypass, and use of higher total volumes with more hydroxyethyl starch in the circuit. Low intraoperative hematocrit levels did not predict excessive postoperative hemorrhage (>1 L of mediastinal drainage in the first 12 hours). This occurred in 26% (n = 140) of patients undergoing on-pump operations and in 25% of patients undergoing off-pump operations and in multivariate analysis was associated with male sex, longer pump times, not receiving aprotinin, and operations performed by certain surgeons but not with total circuit or hydroxyethyl starch volume. We observed that the risk factors for the development of a low intraoperative hematocrit level and excessive postoperative bleeding differed. Our results suggest that decreasing these outcomes in patients undergoing cardiac surgery requires a comprehensive approach, including limiting hemodilution, particularly in female subjects with lower preoperative hemoglobin levels, and careful attention to surgical hemostasis.