Abstract
We examind the bleeding volumes during the operations from our experiences with 120 cases of posterior fusion for scoliosis.
1. Among the cases without hypotensive anesthesia, the bleeding volumes were far less than that with hypotensive anesthesia reported by other institutes in Japan.
2. Under GOE anesthesia, the bleeding volume per vertebra of the cases with hypotensive anesthesia was more than that without hypotensive anesthesia.
3. When we used special flame made of roll cloth in order to decrease the abdominal and intrathoracic pressure, the bleeding volume per vertebra was far less than the reports from other institutes, in which cases they used conventional flames.
4. We found no significant differences of the bleeding volumes between the different anesthetic methods during the operations.
From these considerations, it turned out that the usefullness of hypotensive anesthesia is open to question. To decrease the bleeding volume during operation, we consider that it would be necessary to decrease the central venous pressure, namely, to prevent the increasing of the abdominal and intrathorasic pressure.
