BACKGROUND: Endotoxins play important roles in the pathophysiologic alterations associated with sepsis so the authors examined the effects of hydroxocobalamin, NW-nitro-L-arginine-metyl ester (L-NAME) and aminoguanidine on thiopental-induced contractile responses of lipopolysaccharide (LPS)-treated and control rat aortic rings. METHODS: Aortic ring preparation was obtained from LPS-treated (1.5mg/kg, i.p. for 18h) rats. Cumulative doses of thiopental (10-4~3x10- 3M) were added to construct contraction response curves. Hydroxocobalamin (10-5M), L-NAME (10-6M) or aminoguanidine (10-6M) were added as NO scavenger or as NOS inhibitors. Contraction curves by cumulative doses of thiopental (10-4~3x10-3M) were remeasured after treatment of NO scavenger or NOS inhibitors. Statistical significances (p<00.05) were analyzed according to data characteristics by Student's t-test, paired t-test or ANOVA. RESULTS: The vascular responses of cumulative thiopental (10-4~3x10 3M) administration were dose- dependent contraction and LPS-treated rat was less contracted (p<00.05). There was significant increment on vascular contraction induced by thiopental after hydroxocobalamin pretreatment in LPS-treated rat (p<0.05), in spite of L-NAME, aminoguanidine pretreatment was failed to increase contractile forces in control and LPS-treated rats. CONCLUSIONS: From these results, viewed from maintenance of vasomotor tone in septic state, it is suggested that hydroxocobalamin may be candidate for vasopressor during usual induction of general anesthesia.
Anesthesia, General ; Animals ; Aorta, Thoracic* ; Endotoxins ; Hydroxocobalamin* ; NG-Nitroarginine Methyl Ester ; Rats* ; Sepsis ; Thiopental

BACKGROUND: Recent studies revealed that inhalational anesthetics (IA) attenuate NO production. But the hemodynamic changes produced by IA in septic syndrome patient are still sufficient to threaten patient, surgeon and anesthesiologist. So we examined which IA is proper to maintain vascular contractile force and evaluated the effects of NOS inhibitors on contractile force of septic rat aorta under IA. METHODS: Aortic ring preparation was obtained from LPS-treated (1.5 mg/kg, i.p. for 18h) rats. The development of sepsis was confirmed by iNOS activity and iNOS expression using RT-PCR. Contractile responses of aorta to phenylephrine admministation in the presence or absence of halothane, enflurane and isoflurane were evaluated. We also evaluated the effects of NOS inhibitors, one is NG-nitro-L-arginine methyl ester (L-NAME) and the other is aminoguanidine. Statistical significances (p<0.05) were analyzed according to data characteristics by unpaired t-test and paired t-test. RESULTS: The contractile responses to phenylephrine admministration were attenuated in LPS-treated rings. Isoflurane, even at the dose of 2 MAC, didn't affect the contractile response while both halothane and enflurane decreased the contractile response even at the dose of 1 MAC. The potentiation of contractile responses by NOS inhibitors were not affected during administeration of IA. CONCLUSIONS: From these results, it is suggested that isoflurane is the safest inhalational anesthetic and NOS inhibitors, especially L-NAME, may be very useful in the therapy of septic shock patients during general anesthesia.
Anesthesia, General ; Anesthetics* ; Animals ; Aorta ; Enflurane ; Halothane ; Hemodynamics ; Humans ; Isoflurane ; NG-Nitroarginine Methyl Ester ; Nitric Oxide Synthase* ; Nitric Oxide* ; Phenylephrine ; Rats* ; Sepsis ; Shock, Septic

The present study was designed to examine the effect of d-amphetamine on CA release from the isolated perfused model of the rat adrenal gland, and to establish its mechanism of action. D- amphetamine (10~100microM), when perfused into an adrenal vein of the rat adrenal gland for 60 min, enhanced the CA secretory responses evoked by ACh (5.32x10-3 M), excess K+ (5.6x10-2 M, a membrane depolarizer), DMPP (10-4 M, a selective neuronal nicotinic Nn-receptor agonist) and McN-A-343 (10-4 M, a selective M1-muscarinic agonist) only for the first period (4 min), although it alone has weak effect on CA secretion. Moreover, d-amphetamine (30microM) in to an adrenal vein for 60 min also augmented the CA release evoked by BAY-K-8644, an activator of the dihydropyridine L-type Ca2+ channels, and cyclopiazonic acid, an inhibitor of cytoplasmic Ca2+ ATPase only for the first period (4 min). However, in the presence of high concentration (500microM), d-amphetamine rather inhibited the CA secretory responses evoked by the above all of secretagogues. Collectively, these experimental results suggest that d-amphetamine at low concentrations enhances the CA secretion from the rat adrenal medulla evoked by cholinergic stimulation (both nicotininc and muscarinic receptors) as well as by membrane depolarization, but at high concentration it rather inhibits them. It seems that d-amphetamine has dual effects as both agonist and antagonist at nicotinic receptors of the isolated perfused rat adrenal medulla, which might be dependent on the concentration. It is also thought that these actions of d-amphetamine are probably relevant to the Ca2+ mobilization through the dihydropyridine L-type Ca2+ channels located on the rat adrenomedullary chromaffin cell membrane and the release of Ca2+ from the cytoplasmic store.
(4-(m-Chlorophenylcarbamoyloxy)-2-butynyl)trimethylammonium Chloride ; 3-Pyridinecarboxylic acid, 1,4-dihydro-2,6-dimethyl-5-nitro-4-(2-(trifluoromethyl)phenyl)-, Methyl ester ; Adrenal Glands ; Adrenal Medulla* ; Amphetamine ; Animals ; Calcium-Transporting ATPases ; Chromaffin Cells ; Cytoplasm ; Dextroamphetamine* ; Dimethylphenylpiperazinium Iodide ; Membranes ; Neurons ; Rats* ; Receptors, Nicotinic ; Veins

Laryngeal schwannoma is extremely rare. We report the CT and MRI findings of a case occurring in a 65-year-oldwoman, and describe the pathologic correlation. Pre-contrast CT scanning revealed a right supraglot-tic mass witha slightly hyperdense central part and a hypodense peripheral part. Post-contrast CT scanning re-vealed anenhanced hyperdense central part and a rim-like hypodense peripheral part. The density of the pe-ripheral part waslower than that of muscle. The mass showed homogeneous low signal intensity on T1-weighted MR images, homogeneoushigh signal intensity on T2-weighted MR images, and an enhanced high signal intensity central part and a lowsignal intensity peripheral part on gadolinium enhanced T1-weighted images. The enhanced central part correlatedwith Antoni A areas and the peripheral part, showing low attenuation, correlated with Antoni B areas.
Gadolinium ; Magnetic Resonance Imaging ; Neurilemmoma* ; Tomography, X-Ray Computed

BACKGROUND: Various local anesthetics have been shown to cause relaxation of isolated vascular rings contracted by phenylephrine. Recent studies reported that local anesthetics enhance nitric oxide (NO) production by human peripheral neutrophils. The author measured the effects of local anesthetics of nitrite production in LPS-treated rat aortic vascular smooth muscle cells and examined the effects of NW-nitro-L-arginine methyl ester (NAME) on vascular relaxant responses of lidocaine and bupivacaine in LPS-treated rat aortic rings. METHODS: Aortic ring preparations were obtained from LPS-treated (1.5 mg/kg, i. p. for 18hours) rat. Contractile responses of aorta to phenylephrine in dose-dependent administeration of lidocaine and bupivacaine (10(-6)M 10(-3)M) was examined. And also evaluated the effects of NAME (10(-6), 10(-5) and 10(-4)M) on relaxant responses of lidocaine and bupivacaine in LPS-treated rat aortic rings. From the cultured vascular smooth muscle cells, nitrite production of lidocaine and bupivacaine were measured by Griess reaction method. RESULTS: Lidocaine and bupivacaine enhanced the production of nitrite, the stable end product of nitric oxide, in cultured media of the vascular smooth muscle cells of the rat aorta but it didn't enhance significantly. NAME enhanced the contractile responses to lidocaine and bupivacaine in the LPS-treated rats significantly (p<0.05) but it didn't increase dose-dependently. CONCLUSION: These results show that lidocaine and bupivacaine increased NO production slightly in the LPS-treated rats and the vascular relaxant responses of local anesthetics were more enhanced because of NO production in LPS-treated rat.
Anesthetics, Local ; Animals ; Aorta* ; Bupivacaine* ; Humans ; Lidocaine* ; Muscle, Smooth, Vascular ; Neutrophils ; Nitric Oxide Synthase* ; Nitric Oxide* ; Phenylephrine ; Rats* ; Relaxation

BACKGROUND: Endotoxins play important roles in the pathophysiologic alterations associated with sepsis so we examined the effects of volatile anesthetics on vascular smooth muscle contractile function in LPS-treated rat aorta. METHODS: Fifty male Sprague-Dawley rats(250~300 gm) were made septic by intraperitoneal injection of lipopolysaccharide(1.5 mg/kg). Cumulative doses of phenylephrine and norepinephrine(10 -8~10 -5M) were added to construct a contraction response curve. Two percent of volatile anesthetics, IBMX (3-isobutyl-1-methylxanthine, phosphodiesterase inhibitor) or L-NAME(Ng-nitro-L-arginine-methylester, Nitric oxide synthase inhibitor) was added and those contractile responses were observed respectively. We also measured nitric oxide synthase (NOS) activity of liver, lung and adrenal gland after 18 hours in the LPS-treated rats. Individual values between the control rats and LPS-treated rats were compared by unpaired t-test. A p-value less than 0.05 was considered statistically significant. RESULTS: Contractile response of 2% halothane to norepinephrine was significantly decreased both in the control rats and LPS-treated rats. The NOS inhibitor enhanced the contractile responses to phenylephrine and norephinephrine in the vessels from LPS-treated rats more significantly than those of control rats. CONCLUSIONS: These results suggest that LPS-treatment impairs vasopressor-induced contractility and doesn't alter the contractile responses during administration of volatile anesthetics.
1-Methyl-3-isobutylxanthine ; Adrenal Glands ; Anesthetics* ; Animals ; Aorta ; Endotoxins ; Halothane ; Humans ; Injections, Intraperitoneal ; Liver ; Lung ; Male ; Muscle, Smooth, Vascular ; Nitric Oxide ; Nitric Oxide Synthase ; Norepinephrine ; Phenylephrine ; Rats* ; Rats, Sprague-Dawley ; Sepsis

The B-type gamma knife unit was installed at Kyung-Hee University Hospital in March 1992. The selective beam plugging method can be used to reduce the low percentage isodose profiles of normal sensitive organ and to codify the isodose cuties of treatment volume for better shaping of the target volume. For representing the changes of the law percentage isodose profiles, the variations of dose distribution for several cases were discussed in this paper. The film dosimetry was performed for the evaluation of calculated isodose profiles predicted by KULA dose planning system. The results were verified by RFA-3 automatic densitometry. The clinical application of selective beam shielding method was performed in 17 patients in 100 patients who have undergone gamma knife radiosurgery for a year. The calculated and the measured isodose profiles for the high percentage regions were well consistent with each other. When the target of pituitary tumor is macro-size, the selective beam shielding method is the most applicable method. When the target size, however, is small, the correct selection of the proper helmet size is very important. All patients were exposed almost about 3~12 Gy for brain stem, and 3~11.2 Gy for optic apparatus. It is recommended that the same or other plugging patterns with multiple isocenters should be used for protection of the radiosensitive normal structures with precise treatment of CNS lesions.
Brain Stem ; Densitometry ; Film Dosimetry ; Head Protective Devices ; Humans ; Jurisprudence ; Pituitary Neoplasms ; Radiosurgery

BACKGROUND: It has been known that Ginseng extract causes the hypotensive action while it rather produces the hypertensive action. Some studies have suggested that Ginseng extract causes a biphasic response on blood pressure, namely, transient fall followed by prolonged elevation. It has been also shown that administration of Korean Red Ginseng powder has no effect on blood pressure in normotensive and hypertensive rats. The present study was designed to examine the effect of total Ginseng saponin on contractile responses of vasoconstrictors in the rat aorta and to establish the mechanism of its action. METHODS: The ring segment of aorta was mounted in a muscle bath filled with oxygenated Krebs solution for the measurement of isometric tension. After the equilibration period, under the presence of total Ginseng saponin, isometric tension induced by some vasoconstrictors were observed and compared to the control responses. The data were expressed as % of the control tension. RESULTS: Phenylephrine (an adrenergic alpha1-receptor agonist) and high potassium (a membrane depolarizing agent) caused greatly contractile responses in the rat aorta, respectively. However, in the presence of total ginseng saponin (600 g/ml), the contractile responses of phenylephrine (10(-6) and 10(-5) M) and high potassium (3.5 x 10(-2) and 5.6 x 10(-2) M) were markedly potentiated whereas prostglandin F2alpha(5 x 10(-6) M)-induced contractile responses was not affected. The contractile responses induced by phenylephrine (10(-5) M) and high potassium (3.5 x 10(-2) M) even under the presence of total ginseng saponin (600 g/ml) were greatly inhibited by the pretreatment of nicardipine (10(-6) M), a calcium channel blocker. CONCLUSION: Taken together, these experimental results suggest that total ginseng saponin can enhance the contractile responses evoked by stimulation of adrenergic alpha1-receptor and the membrane depolarization in the isolated rat aortic strips, which seems to be associated to calcium influx.
Animals ; Aorta* ; Baths ; Blood Pressure ; Calcium ; Calcium Channels ; Membranes ; Nicardipine ; Oxygen ; Panax* ; Phenylephrine ; Potassium ; Rats* ; Saponins* ; Vasoconstriction ; Vasoconstrictor Agents*

The present study was attempted to investigate the effect of vasoactive intestinal polypeptide (VIP) on secretion of catecholamines (CA) and to establish whether there is the existence of a noncholinergic mechanism in adrenomedullary CA secretion from the isolated perfused rat adrenal gland. The perfusion into an adrenal vein of VIP (3 X 10-6 M) for 5 min or the injection of acetylcholine (ACh, 5.32 X 10-3 M) resulted in great increases in CA secretion. Tachyphylaxis to releasing effect of CA evoked by VIP was not observed by the repeated perfusion. The net increase in adrenal CA secretion evoked by VIP still remained unaffected in the presence of atropine or chlorisondamine. However, the CA release in response to ACh was greatly inhibited by the pretreatment with atropine or chlorisondamine. The releasing effects of CA evoked by either VIP or ACh were depressed by pretreatment with nicardipine, TMB-8, and the perfusion of Ca2+-free medium. Moreover, VIP- as well as ACh-evoked CA secretory responses were markedly inhibited under the presence of (Lys1, Pro2.5, Arg3.4, Tyr6)-VIP or naloxone. CA secretory responses induced by ACh and high K+ (5.6 X 10-2 M) were potentiated by infusion of VIP (3 X 10-6 M for 5 min). Taken together, these experimental results indicate that VIP causes CA release in a fashion of calcium ion-dependence, suggesting strongly that there exists a noncholinergic mechanism that may be involved in the regulation of adrenomedullary CA secretion through VIP receptors in the rat adrenal gland, and that VIP may be the noncholinergic excitatory secretagogue present in the chromaffin cells.
Acetylcholine ; Adrenal Glands ; Adrenal Medulla* ; Animals ; Atropine ; Calcium ; Catecholamines ; Chlorisondamine ; Chromaffin Cells ; Naloxone ; Nicardipine ; Perfusion ; Rats* ; Receptors, Vasoactive Intestinal Peptide ; Tachyphylaxis ; Vasoactive Intestinal Peptide ; Veins

BACKGROUND: To evaluate the success rate of balloon dilation and the factors possibly influencing the outcomes of balloon dilation for the ureteric strictured portion of ureteroureterostomy (UUS) site in patients with post-gynecologic surgeries.METHODS: A single institution data base was screened for the patients who received balloon dilation for a treatment of ureteral stricture diagnosed after gynecologic surgery. Overall 114 patients underwent primary intra-operative UUS due to ureteral injury during gynecologic surgery. Among them, 102 patients received balloon dilation, and their medical records were retrospectively reviewed. Success of balloon dilation was defined as the condition that requires no further clinical interventions after 6 months from balloon dilation.RESULTS: The ureter injury rate of women treated with open radical abdominal hysterectomy was highest (32 cases, 31.4%). 60 patients (60.8%) showed successful outcomes regarding dilation. All patients underwent technically successful dilation with a full expansion of balloon during the procedure, but 40 patients (39.2%) were clinically unsuccessful as they showed a recurrence of ureteral stricture on the previous balloon dilation site after the first dilation procedure. Univariate logistic regression analyses showed that stricture length >2 cm was a significant predictor of successful dilation (odds ratio, 0.751; 95% confidence interval, 0.634–0.901; p-value, 0.030), but it failed to achieve independent predictor status in multivariate analysis.CONCLUSION: Balloon dilation can an effective alternative treatment option for strictured portion of the primary UUS in post-gynecologic surgery patients when its length is < 2 cm.
Constriction, Pathologic ; Female ; Gynecologic Surgical Procedures ; Humans ; Hysterectomy ; Logistic Models ; Medical Records ; Multivariate Analysis ; Postoperative Complications ; Recurrence ; Retrospective Studies ; Ureter