The Efficacy of Epinephrine-Containing Test Dose during Propofol-Nitrous Oxide Anesthesia with High Dose Fentanyl / 대한마취과학회지

BACKGROUND: The aim of this study is to determine the effect of high dose fentanyl on the test dose containing 15microgram epinephrine during propofol anesthesia. METHODS: One hundred patients with ASA physical status 1 were randomized to receive 2 mg/kg propofol with or without 10microgram/kg fentanyl at the induction of anesthesia (n = 50 each). Anesthesia was maintained with propofol 8 mg/kg/h and 67% nitrous oxide in oxygen. Each group of patients were further divided into a test dose group receiving 1.5% lidocaine 3 ml plus epinephrine 15microgram or a saline group receiving 3 ml of isotonic saline (n = 25 each). Heart rate (HR) and systolic blood pressure (SBP) were monitored for 4 min after intravenous injection of the study drugs. RESULTS: In the propofol and the propofol-fentanyl group, the intravenous injection of the test dose produced a HR increase > or = 20 bpm (conventional HR criterion) in 25 and 23 out of the total 25 patients, respectively. Therefore, in the propofol-fentanyl group, sensitivity, specificity, positive predictive value, and negative predictive value were 82%, 100%, 100%, and 92.6%. According to the modified HR criterion (HR increase > or = 10 bpm), all the values were 100%. All patients receiving test dose developed SBP increase > or = 15 mmHg. CONCLUSIONS: Our results indicate that both HR increase > or = 10 bpm or SBP increase > or = 15 mmHg are clinically applicable during propofol-nitrous oxide anesthesia with 10microgram/kg fentanyl.

Vital Sign Changes to an iv Test Dose of Epinephrine and Lidocaine with and without Glycopyrrolate Pretreatment / 대한마취과학회지

In order to decrease complications of local anesthetic, early detection of intravascular injection of local anesthetics is inevitable. However, heart rate response to intravenous(iv) epinephrine test dose injection may result in false-positive or false-negative result. Besides, glycopyrrolate pretreatment may enhance heart rate response to epinephrine test dose. We allocated randomly 30 ASA physical status 1 and 2 patients to two groups, to receive glycopyrrolate 0.2 mg(n=15) or same volume of saline(n=15). Five minutes after glycopyrrolate pretreatment, patients received iv test dose of 2% lidocaine 3 ml with epinephrine 15 pg at a rate of 1 ml/sec. Two groups were similar with respect to basal heart rate. Heart rate and mean arterial pressure increased significantly in both groups at 1, 2, 3 and 4 minutes after epinephrine test dose injection. After 5 minutes, heart rate and mean arterial pressure normalized in both groups. Thus we might suggest that glycopyrrolate pretreatment has no influence on the sensitivity of the test dose containing 2% lidocaine 3 ml and epinephrine 15 ug to detect intravascular injection of local anesthetics.