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    Comparison of Bispectral Index and Vital Parameters in Rabbits Receiving Propofol or Isoflurane Anesthesia
    (Univ Fed Rio Grande Do Sul, 2013) Saritas, Tuba Berra; Saritas, Zulfikar Kadir; Korkmaz, Musa; Sivaci, Remziye Gul
    Background: Reflexes, muscle tonus, heart rate, respiratory frequency and blood pressure are parameters that can be used to evaluate the depth of anesthesia. Bispectral index (BIS) was developed with the objective of evaluating quantitatively the sedative and hypnotic effects of anesthetic drugs. It is widely used to assess central nervous system depression levels. The objective of this study was to compare changes in BIS and several vital parameters during general anesthesia achieved with either propofol or isoflurane, following premedication with dexmedetomidine. Materials, Methods & Results: Adult female New Zealand rabbits (Mean +/- SD body weight 3.6 +/- 0.4 kg) were procured from a commercial source certified for medical experimentation. The animal number in each of the two study groups was four, for a total of eight. The animals were checked before the study to ascertain their good health. The animals, randomly allocated to either of two study groups, were given dexmedetomidine, 20 mu g/kg i.v. Induction was realized by means of propofol, 8 mg/kg i.v. in the propofol group (n = 4), and by administration through a glove mask of isoflurane, 4%, in the isoflurane group (n = 4). Anesthesia maintenance was assured by propofol, 0.6 mg/kg/min or 2% isoflurane with oxygen, respectively. Both anesthetic applications were well tolerated by the rabbits. Before premedication (T0), at the time points of 1 (T1) and 5 min (T2) after dexmedetomidine injection, 1 min into anesthesia induction (T3), and 10 (T4), 30 (T5) and 60 min (T6) after start of maintenance, the following were recorded: BIS, systolic, diastolic and mean arterial blood pressure, heart rate and Anesthesia Score (AS). Blood gas analysis, serum sodium and potassium, blood glucose level, hemoglobin and hematocrit were measured at time points T0 and T6. MAP dropped significantly lower in the propofol group at times T-2, T-3 and T-4 (P < 0.05). Under BIS monitoring, BIS values were also found to be relatively lower in the propofol group at times T-1, T-2 and T-4, corresponding in this to AS. At T-4, the BIS values were, respectively, 69.5 +/- 6.24 and 68.25 +/- 3.59 in the isoflurane and propofol groups (P < 0.05). In summary, premedication with dexmedetomidine did not, differently than with humans, assure deep sedation; BIS values, in parallel with our AS evaluation, reached levels of deep anesthesia in the maintenance stage both in the propofol and isoflurane groups. BGA results in arterial blood (pH, PaO2, PaCO2, BE, HCO3) as well as hematocrit (Hct), Na+, K+, glucose, hemoglobin (Hb) were recorded and reported in Table 2. A significant increase in pH was noted at T-6 (P < 0.05) in the propofol groups compared to animals given isoflurane (7.39 +/- 0.01 vs 7.35 +/- 0.003, respectively), all measurements remaining within the normal values. Discussion: Vital parameters showed parallelism with the values of both our AS and BIS in this study, in which we administered general anesthesia with either propofol or isoflurane to rabbits premedicated with dexmedetomidine. Publications on humans show that surgical anesthesia is realized at BIS values under 60; BIS fell in rabbits in parallel to MBP at 10, 30 and 60 min of anesthesia, and AS also showed that the depth of anesthesia was adequate. No surgery having been performed in this study, we think that the parameters noted in this paper should be investigated in future studies that include surgery.
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    Comparison of the Depth of Anesthesia Produced with Dexmedetomidine-Sevoflurane or Medetomidine-Sevoflurane by Using Bispectral Index Monitoring
    (Univ Fed Rio Grande Do Sul, 2014) Saritas, Zulfikar Kadir; Korkmaz, Musa; Saritas, Tuba Berra; Sivaci, Remziye Gul
    Background: Bispectral index (BIS) monitor was developed to utilize the depth of anesthesia by estimating electroencephalogram (EEG) signals. BIS, which is the numerical value of EEG derivative, is used for evaluation of depression of central nervous system (CNS) in human medicine. The depressive effect of sedative and anaesthetic agents on CNS in human is correlated to BIS. Dexmedetomidine (DEX) is administered as continuous infusion during anesthesia and surgery in humans. DEX is a hypnotic with high selectivity for alpha 2-adrenergic receptors. Materials, Methods & Results: Adult female New Zealand rabbits (mean +/- SD body weight 3.8 +/- 0.5 kg) were procured from a certified commercial source to use in medical researches. The animal number in each of the two study groups was four, for a total of eight. The rabbits were randomly divided into two equal groups (n = 4). The rabbits DEX group were administered 20 mcg/kg of i.v. DEX HCI for premedication. Medetomidine (MED) group was administered 20 mcg/kg of iv MED for premedication. Induction was provided by 5% of sevoflurane + 4 L/min oxygen via glove mask in the both groups. General anesthesia was maintained with 3% of sevoflurane + oxygen on spontaneous respiration for 30 min. The animals' temporomandibular region was shaved; its fat was eliminated with ether before the study. Human sensors were used as BIS sensor consisted of 5 electrodes. Three were placed into frontal area as the remaining two into the pre-auricular area. After ensuring the connection of the sensor to the BIS monitor, BIS value was continuously followed and recorded at 0 min (T0), 1st (T1), 5th (T5), 7th (T7), 9th (T9), 15th (T15) 20th (T20), 25th (T25) and at 30th min (T30) in both groups while the rabbits were awake. At T1 measure point, DEX and MED were applied; sedation was produced at T5; 5% of sevoflurane was administered through glove-mask method at T7 for induction; general anesthesia was obtained at T9 and continued during T15, T20, T25 and T30; they were awakened at the end of 30th min. On the day preceding the study, they were sedated; their femoral arteries were localized and catheterized under local anesthesia following sedation. At T0, T1, T5, T7, T9, T15, T20, T25 and T30 measure time points, the catheter-transducer connection was established for mean arterial blood pressure (MAP) measurement; for ECG monitoring, ECG electrodes were attached to all four extremities of the subjects and, ECG tracings from lead II were monitored and recorded on the multi-channel monitor. The pH was kept between 7.35 - 7.45, as PCO2 between 35 - 45 mmHg. All animals in both groups were documented during the study for Anesthesia Score (AS). MAP and BIS decline in DEX group at the end of 1st min at statistical significance (P < 0.05). At the same time point, AS was recorded higher in DEX group (P < 0.05). In the comparison of DEX group with MED group at T5; HR, MAP and BIS markedly declined in DEX group (P < 0.05); however, AS was found higher in DEX group as being statistically significant at the same time point (P < 0.05). As it was at T5, Heart Rate (HR), MAP and BIS were also found statistically significantly low in DEX group at T7 and T9; while AS was found higher as compared to MED group (P < 0.05). BIS value in MED group was low at a statistical significance level at T15, T20, T25 and T30 time points (P < 0.05). Discussion: In present study, sevoflurane administration with glove mask method provides sufficient anesthesia in the rabbits which were premedicated with DEX and MED in experimental studies or surgical procedures during veterinary practice. Besides the vital parameters and AS monitoring, BIS monitoring is also an effective method in determination of the depth of anesthesia in rabbits.