Related Experiment Videos
[Intraoperative ST-T depression during extreme hemodilution]
M Sugimoto1, K Takemoto, M Miyazaki
1Department of Anesthesia, Osaka National Hospital.
Masui. the Japanese Journal of Anesthesiology
|August 1, 1996
Summary
Massive bleeding during surgery can lead to hemodilutional myocardial ischemia. A critical hemoglobin level of approximately 2 g.dL-1 was observed, causing significant hemodynamic instability and ECG changes.
Area of Science:
- Cardiology
- Neurosurgery
- Hematology
Background:
- Cerebral arterio-venous malformation (AVM) removal is a complex neurosurgical procedure.
- Massive intraoperative bleeding can occur, necessitating aggressive fluid management and transfusion strategies.
Observation:
- A 45-year-old woman experienced massive bleeding during AVM removal.
- Initial plasma constituent transfusion lowered hemoglobin to 5 g.dL-1 without hemodynamic changes.
- Myocardial ischemia, indicated by ST segment depression on ECG, occurred at a hemoglobin of 2.2 g.dL-1.
Findings:
- Hemoglobin levels as low as 2.2 g.dL-1 can precipitate myocardial ischemia and hemodynamic compromise (BP 70/40 mmHg, elevated CVP).
- Rapid transfusion of red blood cells and whole blood effectively restored hemodynamic stability and resolved ECG abnormalities.
- The critical threshold for hemodilutional myocardial ischemia in this case was approximately 2 g.dL-1.
Implications:
- Establishes a critical low hemoglobin threshold for hemodilutional myocardial ischemia during acute blood loss.
- Highlights the importance of vigilant hemodynamic and electrocardiographic monitoring during major surgical bleeding.
- Underscores the efficacy of prompt red blood cell transfusion in managing severe anemia-induced ischemia.