The Relationship between Hemoglobin Level before Acute Normovolemic Hemodilution and Nadir Level of Hemoglobin during Cardiopulmonary By-pass in Elective Coronary Artery Bypass Graft Surgery

Document Type : Original Article(s)

Authors

1 Assistant Professor, Department of Anesthesiology, School of Medicine, Isfahan University

2 Student of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran.

Abstract

Background: Current data suggests that basal hemoglobin of 12 mg/dl is suitable for practicing Acute Normovolemic Hemodilution (ANH), during operations not necessitating cardiopulmonary bypass. This level seems to be too low when using CPB, complicating this procedure.Methods: To study the relationship between Hb level before ANH and baseline level of hemoglobin, 581 patients were investigated during cardiopulmonary bypass in elective coronary artery bypass graft (CABG) surgery. Convenient sampling method was used. Repeated measurements of hemoglobin level were done during the operation.Finding: The mean of baseline hemoglobin, first hemoglobin after going on-pomp, nadir hemoglobin during pomp, and hemoglobin during pomp for patients underwent ANH was 15.18, 8.38, 7.8 and 8.2 mg/dl respectively and 13.1, 7.7, 7.2, and 7.6 mg/dl for patients who did not undergo ANH. There was significant correlation between basal and first Hb hemoglobin going on-pomp, nadir hemoglobin during pomp and mean hemoglobin during pomp in both ANH and no-ANH groups (P < 0.001). There was significant difference between results of current formula to predetermine nadir hemoglobin, and our actual nadir hemoglobin obtained from patients. Minimum level of suitable basal hemoglobin for practicing ANH (450 ml) during on-pomp CABG, was calculated to be 14.55 mg/dl (sensitivity: 77%, specificity: 70%, and AUC: 0.805) and 12.95 mg/dl (sensitivity: 71%, specificity: 64%, and AUC: 0.686) for on-pomp CABG without ANH.Conclusion: Basal hemoglobin for practicing ANH during on-pomp surgery, somehow, depends on threshold hemoglobin for blood transfusion and acceptance of advantages and disadvantages of ANH and its complications by physician and patient.

Keywords

References

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Journal of Isfahan Medical School
Volume 28, Issue 117 - Serial Number 117
November and December 2011
Pages 1194-1204

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History

  • Receive Date: 19 March 2011
  • Revise Date: 03 June 2024
  • Accept Date: 06 April 2022

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