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[Effect of deliberate hypotension with PGE1 on PaO2 in pediatric patients]
J Aono1, Y Kataoka, E Takimoto
1Department of Anesthesiology and Resuscitology, Kochi Medical School, Nankoku.
Insights
Prostaglandin E1 (PGE1)-induced hypotension significantly reduced blood oxygen levels (PaO2) in adults but not in children. This indicates smaller intrapulmonary shunting in pediatric patients during induced hypotension.
Area of Science:
- Anesthesiology
- Pediatric Anesthesia
- Cardiovascular Physiology
Background:
- Deliberate hypotension is used in surgery to reduce blood loss.
- Prostaglandin E1 (PGE1) is a vasodilator used to induce hypotension.
- The effects of PGE1-induced hypotension on blood oxygenation may differ between pediatric and adult patients.
Purpose of the Study:
- To compare the effect of PGE1-induced hypotension on partial arterial oxygen pressure (PaO2) in pediatric versus adult surgical patients.
- To investigate potential age-related differences in physiological responses to induced hypotension.
Main Methods:
- Seven pediatric patients (3-9 years) and 10 adult patients (35-65 years) undergoing elective head and neck surgery were studied.
- Anesthesia was maintained with enflurane, nitrous oxide, and fentanyl. Ventilation controlled PaCO2 to 35-40 mmHg.
- Hypotension was induced with continuous PGE1 infusion to maintain 70% of presurgical systolic blood pressure. Blood gases (PaO2) were measured before, during, and after hypotension.
Main Results:
- Adult patients experienced a significant reduction in PaO2 during PGE1-induced hypotension.
- Pediatric patients showed no significant change in PaO2 under the same hypotensive conditions.
- These findings suggest a difference in intrapulmonary shunting between the age groups.
Conclusions:
- PGE1-induced hypotension has a differential impact on PaO2 in pediatric versus adult patients.
- Children exhibit smaller intrapulmonary shunting compared to adults during PGE1-induced hypotension.
- This study highlights the importance of considering age-specific physiological responses in anesthetic management during induced hypotension.
Abstract:
We compared the effect of deliberate hypotension with PGE1 on PaO2 between pediatric and adult patients. Seven children, aged 3-9 yrs and 10 adults, aged 35-65 yrs who were scheduled for elective head and neck surgeries were studied. Anesthesia was maintained with enflurane, 50% N2O in oxygen and supplemental infusion of fentanyl. Ventilation was controlled to maintain PaCO2 at 35-40 mmHg. Hypotension was induced with continuous infusion of PGE1 and the systolic blood pressure was maintained at 70% of the presurgical value. Blood gases were measured three times, i.e. before, during, and after hypotension. The hypotension in adults caused a significant reduction in PaO2. In children, on the contrary, PaO2 was not affected by the hypotension. The results suggest that intrapulmonary shunting is smaller in children than in adults during PGE1-induced hypotension.