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Minimum alveolar concentration of sevoflurane in elderly patients
R Nakajima1, Y Nakajima, K Ikeda
1Department of Anesthesiology and Critical Care Medicine, Hamamatsu University School of Medicine, Japan.
Abstract:
We have determined the minimum alveolar concentration (MAC) for sevoflurane in elderly patients (mean age 71.4 yr). MAC was found to be 1.48 (SEM 0.08)%, which is smaller than the values for children and adults. The magnitude of the change in MAC with age is similar to that for halothane and isoflurane. The calculated anesthetic ED95 for preventing 95% of patients from moving was 1.98%.
Insights
The minimum alveolar concentration (MAC) of sevoflurane is lower in elderly patients compared to younger adults and children. This finding is crucial for safe anesthetic management in geriatric populations.
Area of Science:
- Anesthesiology
- Geriatric Medicine
- Pharmacology
Background:
- Anesthetic requirements change with age.
- Sevoflurane is a widely used inhalation anesthetic.
- Limited data exists on sevoflurane MAC in the elderly.
Purpose of the Study:
- To determine the minimum alveolar concentration (MAC) of sevoflurane in elderly patients.
- To compare sevoflurane MAC in the elderly to other age groups.
- To establish the anesthetic ED95 for sevoflurane in this population.
Main Methods:
- Studied elderly patients with a mean age of 71.4 years.
- Determined the MAC of sevoflurane.
- Calculated the anesthetic ED95.
Main Results:
- The MAC for sevoflurane in elderly patients was found to be 1.48% (SEM 0.08%).
- This value is significantly lower than reported MAC values for children and adults.
- The anesthetic ED95 was calculated to be 1.98%.
Conclusions:
- Elderly patients exhibit a reduced MAC for sevoflurane.
- The age-related decrease in sevoflurane MAC is comparable to that observed with halothane and isoflurane.
- Anesthetic dosing of sevoflurane should be adjusted for elderly patients.