| Cardiovascular Responses to Endotracheal Intubation in Patients Receiving Desflurane Anesthesia for Anesthetic Induction. |
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Cheol Won Jeong, Sang Hyun Kwak, Myung Ha Yoon, Sung Su Chung, Chang Young Jeong, In Ho Ha, Jong Duk Cho, Kyung Yeon Yoo |
1Department of Anesthesiology, College of Dentistry, Chonnam National University Medical School, Gwangju, Korea.
2Seonam University Hospital, Gwangju, Korea. |
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| Abstract |
BACKGROUND
Desflurane is known to augment central and systemic sympathetic nervous activity. The present study was aimed at examining the effects of desflurane on cardiovascular responses to intubation.
METHODS
Seventy-five ASA physical status I patients (aged 35-60 yr) were assigned randomly to receive one of three treatment regimens (n = 25 each): 1 minimum alveolar concentration (MAC) of sevoflurane, 1 MAC of desflurane or 2 MAC of desflurane. Anesthesia was induced with IV thiopental (5 mg/kg), while patients were ventilated with 100% oxygen.
Tracheal intubation was facilitated with IV vecuronium (0.12 mg/kg). After intubation, patients received each anesthetic gas in oxygen via a semiclosed anesthesia circuit. Systolic arterial blood pressure (SAP), heart rate (HR) and rhythm, and plasma catecholamine concentrations were measured.
RESULTS
The intubation resulted in immediate increases of SAP and HR in all groups; peak effects occurred within 1 min of the intubation. In addition, 2 MAC desflurane elicited a secondary hemodynamic effect at 3 to 5 min after the intubation. The plasma concentrations of norepinephrine increased significantly when measured at 1 min after intubation in all groups, and returned to preintubation values at 5 min in the 1 MAC desflurane groups, but showed further increases at 5 min in the 2 MAC group.
CONCLUSIONS
These results show that 2 MAC desflurane elicits a biphasic hemodynamic response along with an augmented norepinephrine release, where the first appears within 1 min and the second at 3 to 5 min after intubation. |
| Key Words:
endotracheal intubation; catecholamine; desflurane; hypertension; tachycardia |
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