Retropharyngeal Dissection during Nasotracheal Intubation: A Case Report / 대한구급학회지

Nasotracheal intubation is commonly performed for oropharyngeal or facial surgery. Although retropharyngeal dissection is a rare complication of nasotracheal intubation, serious sequelae may result. We report a case of a traumatic retropharyngeal dissection during nasotracheal intubation without untoward sequelae.

Effect of PaCO2, PETCO2, P(a-ET)CO2 and Regional Cortical Blood Flow on the Prognosis of Craniotomy Patients / 대한마취과학회지

BACKGROUND: Carbon dioxide is a potent cerebral vasodilator. The change of carbon dioxide partial pressure may influence the intracranial pressure and the patients' neurological outcome. There are few reports about the influence of end-tidal CO2 (ETCO2), arterial CO2 (PaCO2) and its pressure difference P(a-ET)CO2 during a craniotomy on the Glasgow coma scale (GCS) score for evaluation of neurological status. In this study, authors tried to discover the influence of PaCO2, PETCO2, and P(a-ET)CO2 on neurological outcome. METHODS: The data of PaCO2 and PETCO2 and P(a-ET)CO2 during a craniotomy was saved. The correlations between each parameter, the GCS score and rCoBF were analyzed. To prevent a direct effect on carbon dioxide tension, blood pressure and body temperature were maintained within a normal range. At the same time, we inserted a probe of the thermal diffusion flowmetry monitor in the subdural space to monitor the regional cortical cerebral blood flow (rCoBF). All the data was saved simultaneously, at the moment of dura closure. RESULTS: There was a fair correlation between the PaCO2 and PETCO2. A low PaCO2 level correlated well with a good GCS score but, not with PETCO2. The mean P(a-ET)CO2 value was 4.4 +/- 3.1 mmHg. The high P(a-ET)CO2 level correlated well with a poor GCS score. High rCoBF correlated well with a good GCS score. However, the changes of PaCO2 and PETCO2 showed no correlations with the rCoBF. CONCLUSIONS: As a result, if we decrease the PaCO2 level by hyperventilation and increase the rCoBF level through proper management during anesthesia, we can improve the patients' neurological outcome.

Rebounded Response in Propofol Coma Therapy / 대한마취과학회지

Barbiturate has been used for the therapy of increased intracranial pressure (ICP) patients. However, it has some serious side effects such as rebound response or convulsion. According to recent reports, propofol can be used for coma therapy and the therapeutic result has been satisfactory. We used propofol instead of barbiturate in coma therapy and experienced a case of rebound response. On admission day, a 20-year-old female patient received an endovascular embolization for an arteriovenous malformation (AVM) in the left occipital lobe. The next day, she went into a coma and the brain CT showed a massive intracerebral hematoma at the AVM site. The patient was transferred to the operating room for decompressive surgery. At the end of the surgery, the brain edema did not subside. The patient was infused with propofol (4 mg/kg/h) after the surgery for propofol coma therapy. During the 6 day propofol therapy, ICP was effectively controlled under 20 mmHg. After completion of the propofol coma therapy, the patient was revived enough to verbally obey. 16 hours later, ICP increased to more than 30 mmHg and the patient was reinfused with propofol. We experienced a rebound response in propofol coma therapy similar to that in barbiturate coma therapy.

The Effects of Intrathecal Ketamine Isomers on Formalin-Evoked Behavior and Spinal c-fos Expression in Rat / 대한마취과학회지

BACKGROUND: This study was designed to investigate the different analgesic potency and the action mechanism of the intrathecal isomers of ketamine. For these purpose, we evaluated the effect of intrathecal ketamine isomers on the behavioral response and the spinal c-fos expression in the formalin tested rats. METHOD: The subjects were divided into 2 groups(NF group, Fgroup). The NF group was designed for the purpose of the drug itself's effect on the induction of c-fos. Saline(NF/saline group), S(+) ketamine(NF/SK group), R(-) ketamine(NF/RK group) and ketamine(NF/K group) were administered intrathecally to be examined by immunocytochemical method. Same drugs were administered in the F group(F/saline, F/SK, F/RK, F/K) and formalin was injected into right hind paw of the rats after 30 minutes of intrathecal drug administration. The number of flinching was counted at intervals of 5 minutes for 60 minutes. In NF and F group, Fos immunoreactive neurons was counted after 2 hours of formalin injection and intrathecal drug injection respectively. RESULTS: In F/saline group, flinching was developed immediately after formalin injection and revealed biphasic response. The number of flinching in F/SK group, F/RK group, F/K group was significantly smaller than that of F/saline group. The number of flinching of F/SK group by comparison of F/SK vs F/RK was significantly smaller, and that of F/K group by comparison of F/RK vs F/K was significantly smaller. There was no significant difference among NF group on the total number of Fos immunoreactive neurons. In F group, Fos immunoreactive neurons increased significantly in comparison with NF group. The total number of Fos immunoreactive neurons in F/SK group, F/RK group and F/K group were significantly smaller than that of F/saline group. Of F group, the number of Fos immunoreactive neurons of F/SK was the smallest and F/K, F/RK followed increasing order. Attenuation of Fos induction by the ketamine isomers was observed in the whole spinal cord of F/SK group and F/K group but in the superficial and deep laminae of F/RK group. CONCLUSION: This study suggests that intrathecal ketamine isomers have an inhibitory effect on pathologic pain and c-fos expression in the rats and different analgesic effect which is lamina specific.

The Effect of Cyclosporine on the Neuromuscular Blocking Action Induced by Rocuronium and Mivacurium in Rabbit / 대한마취과학회지

BACKGROUND: Cyclosporine, an immune suppressive agent has been reported to potentiate the neuromuscular blockade induced by vecuronium and atracurium. And the potentiation degree was more prominent in the vecuronium. Rocuronium and mivacurium have been introduced into clinical practice recently and there is no report whether the cyclosporine potentiates the neuromuscular blocking effects of these agents. We, therefore studied the effect of Sandimun (cyclosporine in cremophor-ethanol) on the neuromuscular blockade action of rocuronium and mivacurium in rabbits. METHOD: The effect of Sandimun on the rocuronium and mivacurium were investigated in anesthetized 30 rabbits. The rabbits were divided into five groups; rocuronium group (rocuronium bromide 1 mg/kg iv), rocuronium - Sandimun group (rocuronium bromide 0.1 mg/kg iv after Sandimun 5 mg/kg iv), mivacurium group (mivacurium chloride 0.064 mg/kg iv), mivacurium - Sandimun group (mivacurium chloride 0.064 mg/kg iv after Sandimun 5 mg/kg iv) and Sandimun group (Sandimun 5 mg/kg iv). Neuromuscular block was assessed by measuring the response of anterior tibial muscle to 0.1Hz single twitch stimulation of the common peroneal nerve. Onset time, duration of muscle relaxation and recovery index were compared among the groups. RESULTS: There were no significant differences in onset time and recovery indices among the groups. Significant difference was found in duration between the rocuronium group and the rocuronium-Sandimun group (p<0.05). CONCLUSION: Sandimun potentiates the rocuronium - induced neuromuscular blockade but not the neuromuscular blocking action of mivacurium.

The Evaluation of Myocardial Contractile Reserve Using Low Dose Dobutamine under Transesophageal Echocardiography to Coronary Artery Bypass Graft / 대한마취과학회지

BACKGROUND: Intraoperative low dose dobutamine test with transesophageal echocardiography may offer a simple, cost effective and widely available mean of detecting contractile reserve in coronary artery disease. The purpose of this study was to determine the effect of low dose dobutamine infusion on ventricular function in patients undergoing coronary artery bypass graft and to predict the post-pump response of dysfunctional myocardial segments to surgical revascularization. METHODS: This study was performed in 23 patients undergoing coronary artery bypass graft. After transesophageal echocardiographic images of transgastric left ventricular short axis view at mid-papillary muscles level were obtained, the percentage of systolic wall thickening(PSWT) was evaluated. The ejection fraction by modified Simpson's method and hemodymic changes were measured simultaneously. RESULTS: The clinical accuracy of intraoperative low dose dobutamine test for PSWT was followed; Sensitivity-76%, specificity-94.7%, positive predictive value-95%, negative predictive value-75% and overall accuracy-84.1%. Ejection fraction increased from 49.0 13.1% to 56.3 11.5%(dobutamine infusion) and 59.5 12.1%(post-pump) significantly(P<.05). During dobutamine infusion and post-pump, cardiac index increased significantly(P<.01). CONCLUSIONS: Intraoperative low dose dobutamine by transesophageal echocardiography is a potentially useful test for prediction of the post pump response of regional systolic function and global ventricular function to coronary revascularization.

A Case of Acute Renal Failure due to Massive Blood Loss during Gastrectomy / 대한마취과학회지

Often anesthesiologists are experienced to performe the inevitable blood transfusion during massive blood loss. Red blood cells are transfused primarily to increase transport of oxygen to tissues. An increase in the circulating red cell mass produces an increase in oxygen uptake in the lungs and a corresponding probable increase in oxygen delivery to tissues. However, tissue hypoxia may develop from infusion of stored blood due to leftward shift in the oxygen dissociation curve especially massive transfusion. And dilutional thrombocytopenia is probably the most likely cause of a hemorrhagic diathesis in a patient who has received multiple units of bank blood. The deposited fibrin may severely alter the microcirculation and lead to ischemic necrosis in various organs, particulary the kidney, especially derranged hemodynamic conditions are exist. A case ofacute renal failure due to massive blood loss during gastrectomy was reviewed.

Baekward Dislocation of Temporomandibular Joint during Induction of Anesthesia / 대한마취과학회지

Dislocation of the temporomandibular joint(TMJ) is fairly frequent but backward dislocation of TMJ during induction of anesthesia is rarely reported. The causes include congenital weakness of the capsule or malformation of the condyles of both. The physical causes are as follows ; The joint may be strained or injured during general anesthesia, 1) possible straing or injureyto the joint, 2) yawning, 3) attempts by children to insert large objects into the mouth, 4) and positional pressures during sleep. Acase of backward dislocation of TMJ occureed during induction of anesthesia and treated with nanual reduction and subsequent intermaxillary fixation.

Anesthesia for a Diabetes Mellitus Paient / 대한마취과학회지

Diabetes is associaed with increased atherosclerosis, microangiopathy, infections and decreasecd wound-healing tensile strength. The evidence that hyperglycemia itself accelerates these complications, or that tight control of blood sugar levels decrease the rapidity of the progression of microan-giopathic disease is very suggestive but not definitive. Perioperative management of the diabetic patient may affect surgical outcome. Here in is a case report and a review of the literature on diabetes mellitus.

Anesthesia for a Diabetes Mellitus Paient / 대한마취과학회지

Diabetes is associaed with increased atherosclerosis, microangiopathy, infections and decreasecd wound-healing tensile strength. The evidence that hyperglycemia itself accelerates these complications, or that tight control of blood sugar levels decrease the rapidity of the progression of microan-giopathic disease is very suggestive but not definitive. Perioperative management of the diabetic patient may affect surgical outcome. Here in is a case report and a review of the literature on diabetes mellitus.

Succinylcholine Effect on Low Concentration of Halothane and Enflurane Anesthesia during Cesarean Section / 대한마취과학회지

The volatile anesthetic agent, halothane and ethrane, are most commonly used in general anesthesia practice and a depolarizing neuromuscular blocker, succinylcholine, is also used for endotracheal intubation, if not contraindicated. There were many reports that the volatile anesthetics affect the neuromuscular transmission in akeletal muscles and potentiate the neuromuscular black induced by depolarizing muscle relaxant in moderate to high concentration. But in halothane, a result was different from those of others. It was well known fact that in pregnant woman, the MAC of the volatile anesthetics is decreased. Therefore, present study was performed to determine whether halothane and ethrane may affect the action of succinylcholine or not, in their low concentration, in 40 healthy pregnant women and we divided them randomly in two groups: halothane administered group(group A), ethrane administered group(group B). Ulnar nerve was stimulated at the wrist through surface electrode, using a peripheral nerve stimulator with supramaximal single twitchimpulse of 0.2 msec duration at a rate of 1.0 Hz. The responses of the adduction of thumb were measured with a force displacement transducer and recorded with a biophysiograph(San Ei, Japan). The single twitch were measured before and after intravenous succinylcholine 1 mg/kg and when full paralysis occurred, 0.5% halothane administered in group A and 1% ethrane administered in group B and observed the effects of halothane and ethrane on the neuromuscular blocking action of succinylcholine. The results were as follows. The time from intravenous succinylcholine onset of paralysis was 15.5+/-3.21 sec in halothane group, and 14.8+/-3.17 sec in ethrane group. The time from onset of paralysis to full paralysis was 42.2+/-5.98 sec in halothane group, and 47.1+/-13.55 sec in ethrane group. Duration of full paralysis was 283.9+/-68.02 aec in halothane group, and 270.8+/-44.49 sec in ethrane group. Recovery index(T26-T76) was 68.4+/-16.11 aec in halothane group, and 75.4+/-21.93 sec in ethrane group. We conclude that there is no significant difference between the effects of halothane and ethrane on the neuromuscular blocking actioa of succinylchpline, in their low concentraction, in healthy pregnant women.

Interaction with d-Tubocurarine and Ketamine in Rabbits / 대한마취과학회지

Ketamine hydrochloride(ketamine) is a non-barbiturate anesthetic agent chemically designated as dl-2-(0-chlorophenyl)2-(methylamino)-cyclohexanone hydrochloride. Ketamine anesthesia has been found distinctively different from that induced by conventional anesthetic agents, as it provides profound analgesia without significant impairment of respiratory function or stimulation of cardiovascular activities thus avoiding hypotension and are preserved the protective pharyngeal and laryngeal reflexes. In addition, ketamine appears to have muscle relaxation properties. This latter clinical finding, however has not been experimentally substantiated since few reports have appeared on the effect of ketamine on muscle relaxation. The present study therefore, was undertaken to determine whether this agent affects the muscle activity during d-tubocurarine block. The experiment was performed on sixteen rabbits weighing 1.8 to 2.5kg and these were divided into two groups; eight rabbits for control and eight for th study group. All animals were intubated through a tracheostomy under general anesthesia with nembutal 40mg/kg given intravenously. Respiration was controlled by means of a Harvard animal respirator. The body temperature was kept at 35 degrees C to 36 degrees C with a thermo-blanket. The common peroneal nerve and anterior tibial muscle was exposed and the nerve stimulator was applied to the nerve muscle preparation. The twhitch height of the muscle contraction was recorded on a biophysiograph through the force displacement transducer. The common peroneal nerve was stimulated supramaximally using a single twitch, square wave of 0.2 msec duration at a frequency of 0.1Hz once every 10 seconds. The degree of neuromuscular block following intravenous injection of d-tubocurarine 1mg/kg was measured in the control group. And in the study group ketamine 5mg/kg was administered intravenously when 25% of twitch height of muscle contraction was obtained spontaneously after the intravenous injection of d-tubocurarine 1mg/kg. The changes of the twitch height of muscle contraction and the time of spontaneous recovery in the study group were compared with those of the control group. The results were as follows: 1) The times and degree of maximal single twitch depression were obtained at 194.8sec and 87.3% in the control group and were at 197.5 sec and 87.8% in study group. No significant difference was observed. 2) Recovery index of the control group was 1,560.0 sec and recovery index of the study group was markedly prolonged to 2,387.5 sec(53.0% prolongation). 3) Mean decrease of single twitch height was 8.8% soon after the intravenous ketamine 5mg/kg when 25% of twitch height was obtained after the intravenous d-tubocurarine 1mg/kg in the study group.

Dose Related Neuromuscular Blocking Effects of d-Tubocursrine Chloride in Rabbits / 대한마취과학회지

Patients vary markedly in their responses to d-tubocurarine chloride. Despite an attempt to diminish the variation in responses to relaxants by standardizing experimental techniques, anesthetic concentration kept constant, acid-base status kept constant, premedication omitted, dosage calculated in terms of mg/sq meter body surface, the marked variation was found to persist. The dose related neuromuscular blocking effect of d-tubocurarine chloride was investigated using a rabbit common peroneal nerve anterior tibial muscle preparation. All experimental rabbits tracheas were intubated through tracheostomy under general anesthesia with Nembutal 40 mg/kg intravenously. Reapiration was controlled by a Harvard animal respirator. The body temperature was kept at 35-37 degrees C by a thermoblanket. The degree of neuromuscular block following intravenous d-tubocurarine chloride was measured by single twitch response. The common peroneal nerve was stimulated supramaximally using a square waves of 0. 2 msec duration at a frequency of 0.1 Hz, and each stimulus was repeated once every 10 seconds. The ratio of the twitch height was calculated. The results were as follows: 1) No neuromuscular blocking effect was observed with 0.1 mg/kg of intravenous d-tubocu- rarine chloride. 2) 100% of neuromuscular blocking effect was observed with more than 1mg/kg of intravenous d-tubocurarine chloride. This is 5 to 10 times higher than the human dose. 3) Dose related prolonged neuromuscular blocking effect was observed from d-tubocurarine chloride in rabbits.

"Train of Four" Response to Intravenous Suceinylcholine Chloride in Rabbits / 대한마취과학회지

The history of muscle relaxants is fascinating, and their use for clinical applications has been accepted. Depolarizing drugs can produce a non-depolarizing type of neuromuscular block. Decamethonium produces a nondepolarizing block in the isolated rabbit lumbrical muscle. Electromyographic studies of the hand muscles in man have demonstrated that a dual block will be produced with doses of succinylcholine varying from 500 to 1,500 mg (initially a delpolarizing block and subsequently a non-depolarizing block exists). The common peroneal nerve in the rabbit knee was stimulated by a "train of four" method (Ali et al) repeated intermittently. The muscle response with the "train of four" method to intravenous succinylcholine chloride (1 mg/kg) in the rabbit was recorded and analysed after a single injection and repeated intravenous injections of succinylcholine chloride 1 mg/kg. Result were as follows: 1) Time after the "train of four" to depression of muscle twiteh of 25, 50, 75 & 100% was 128. 2, 135. 3, 142. 8 and 159 seconds respectively. 2) Recovery index of a single intravenous injection of succinylcholine chloride 1 mg/kg was observed as 3 minutes and 14 seconds. 3) A depolarizing form of "train of four" response to the first succinylcholine chloride injection 1 mg/kg was observed and, a non-depolarizing form of "train of four" response to the second dose of succinylcholine chloride 1 mg/kg was observed definitely.

Intracuff Pressure Change during Inhalation Anesthesia / 대한마취과학회지

The effect of nitrous oxide on endotracheal tube cuff pressure was measured during N2O-O2-halothane anesthesia. Intracuff pressure was increased in a time-related fashion up to 150 minutes. Thereafter no significant increase was observed, The other hand, there is no endotracheal tube cuff pressure change during O2-halothane anesthesia. These findings demonstrate that nitrous oxide has the capacity to diffuse into Portex endotracheal tube cuffs in significant volumes and may result in increased intracuff pressure, and in O2-halothane anesthesia, the nitrogea in the cuff was diffused out from the cuffs.

Cardiac Arrest during Tracheostomy Cannula Misplacement - A Case of Diphtheria / 대한마취과학회지

A case of sudden cardiac arrest due to misplaced tracheostomy cannula was reviewed. The genera1 condition of the patient was febrile, dyspneic and acutely ill. Emergency tracheostomy was performed under ketamine-halothane endotracheal anesthesia. Sudden cardiac arrest was noticed when a metal cannula was inserted through the tracheostomy site by the surgeon after the tracheostomy. Immediate closed chest cardiac massage was performed successfully.