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The Effects of Propofol on Blood-Brain Barrier Disruption with Mannitol Infusion in Cervical Sympathetic Nerve Blocked Rats
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Jin Young Lee, Soo Han Yoon, Jae Hyung Kim, Yun Jeong Chae, Young Joo Lee, Jin Soo Kim, Bong Ki Moon
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Korean J Crit Care Med. 2002;17(2):95-99.
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 Abstract
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- BACKGROUND
Blood brain barrier disruption (BBBD)increases therapeutic agents delivery to brain diseases.Increasing the delivery of therapeutic drugs to the brainimproves out come f or patients with brain tumors.Cervical sympathetic chain block can increase the degree of mannitol induced blood brain barrier disruption in rats.Anesthetic agents may modify hyperosmolar blood brain barrier disruption.Therefore we evaluated the effecfs of pentobarbital and propofol on mannitol induced blood brain barrier disruption(BBBD)in cervical sympathetic nerve blocked rats.
METHODS
14 male Sprague-Dawley rats were divided into 2 groups.Intravenous pentobarbital (group 1,n=7)and propofol (group 2,n=7)were administrated.Rats was blocked with 0.5% bupivacaine on right cervical sympathetic chain.All rats received 37degrees C,25%mannitol (1.75 g/kg) via right carotid artery.BBBD was estimated by Evans blue staining in cerebral hemisphere.
RESULTS
Both groups showed BBBD in right side hemisphere and there was no significant difference between group 1 and group 2 in right side hemisphere.
CONCLUSIONS
The results suggest that propofol could be used to be anesthetics for BBBD in cervical sympathetic blocked rats.
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Prognostic Implication of Serial Blood Lactate Concentrations in SIRS Patient
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Young Joo Lee, Jong Seok Park, Bong Ki Moon, Hee Jung Wang
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Korean J Crit Care Med. 2001;16(2):144-150.
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- Introduction: Lactic acid in circulating blood should provide an index between balance of oxygen consumption and metabolic rate in sepsis or any state of shock. The purpose of the study was to determine the prognostic power of the lactate, the time factor of the blood lactate levels between survivors and non-survivors and the correlation between APACHE III score and blood lactate level in SIRS patients.
METHOD
The study was performed on 99 patients over 16 years old who were admitted to the SICU with the criteria of SIRS.
The blood lactate concentrations were assayed with arterial blood drawn in intervals ranging from 4 to 24 hours and the APACHE III scoring was done in the first 24 hours of SICU admission and daily until discharge or death for 2 weeks.
The highest lactate level of the day was recorded. They were divided into two groups, survivors (n=61) and non-survivors (n=38), according to the outcome.
RESULT
There were significant difference of the first day (D1) as well as peak lactate level between the survivors and the non-survivors (3.02 3.05 vs 7.41 4.78, 3.24 2.70 vs 7.82 4.88 mmol/L). Significant difference of the lactate as well as APACHE III were identified between the survivors and the non-survivors during a 14-days of observation period.
Significant correlations were shown between lactate and APACHE III while the study was being conducted. The peak lactate presented superior to the D1 lactate in mortality prediction.
CONCLUSION
Blood lactate concentration could be used as a prognostic index as well as APACHE III score. Serial blood lactate concentration assays are necessary to predict the outcome.
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Effectiveness of Left Infrascapular Skin Temperature Monitoring in the ICU
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Young Joo Lee, Hyun Jue Gill, Kuem Hee Chung, Jeong Yeon Hong, Bong Ki Moon, Myoung Eun Kim, Min Hyup Choi, Young Seok Lee
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Korean J Crit Care Med. 1998;13(2):229-233.
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- BACKGOUND: Many sites are used to measure the body temperature and each site has different physiologic and practical importance. Several types of skin temperature monitoring have been used as simple, inexpensive and viable alternatives in many settings. In the operating area, it is difficult to insert a temperature probe during operation.
The object of this study was to compare the difference and the correlation between the temperature of the left infrascapular skin region and temperatures of axilla, nasopharynx and rectum, METHODS: Forty-two adult patients who were admitted at surgical ICU were studied. After covering the bed with insulator and sheets, patients were placed in supine position. Temperature monitoring was done at the same time using four temperature probes from two bedside patient monitors in the same patient. The temperatures were measured twice at 30 minutes after application of the temperature probe at 10 minute intervals and the average temperature was recorded.
RESULTS
The differences between skin temperature and rectal, nasopharyngeal, and axillary temperatures were -0.64+/-0.21degrees C (p<0.05), -0.40+/-0.21degrees C, and 0.24+/-0.21degrees C respectively. The lineal correlation between skin temperature and rectal, nasopharyngeal, and axillary temperatures were 0.839, 0.854, and 0.819, respectively (p<0.001).
CONCLUSION
This study suggests that the monitoring of the skin temperature at the left infrascapular skin region is well correlated with the nasopharyngeal, rectal and axillary temperatures. And it will be an easy, simple and safe method which can be used for the patients who are alert but need continuous temperature monitoring in the intensive care unit and as well as for the patients who are in the middle of operation.
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Volume Changes under Isotonic Condition Containing Thiopental in Brain Astrocytoma Cells
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Young Seok Lee, Bong Ki Moon, Sang Gun Han, Young Joo Lee, Jeong Yeon Hong, Kyeong Jin Lee, Soo Han Yoon, Keum Hee Chung, Hyun Jue Gill
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Korean J Crit Care Med. 1998;13(2):194-197.
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- BACKGOUND: Cell volume regulation is especially important in the brain because the brain is confined within a non-compliant vault and cannot tolerate significant perturbations in cell size. Cerebral cell volume regulation mechanisms are activated by sustained disturbances in plasma osmolality. The constancy of cell volume under physiological conditions is generally thought to reflex a balance between influx and efflux of solute and is therefore critically dependent on the properties of the plasma membrane. Cell volume regulation have not been described under isoosmotic solution. The object of the study was to know the effects of thiopental on cell volume change in isoosmotic condition.
METHODS
We made isoosmotic solution without thiopental (Group 1) and isoosmotic solution with 22.9 mM (Group 2), 16.8 mM (Group 3), 13.3 mM (Group 4) thiopental, separately, in order to study changes in cell volume under isoosmotic solution. We put cultured human brain astrocytoma cells into isoosmotic solution for each group and calculated cell volume using Coulter Counter after 30 minutes.
RESULTS
Cell volume was shown to be 5084+/-8580 (micrometer3)in Group 1, 501+/-854 (micrometer3) in Group 2, 1183+/-3839 (micrometer3) in Group 3, and 624+/-1100 (micrometer3) in Group 4. We discovered that cells in Group 2,3,4 were shrunk relative to cells in Group 1 (p<0.01). And there were significant differences in cell volume among thiopental groups.
CONCLUSIONS
Thiopental may has an effect on cell membrane properties and decrease cell volume under isoosmotic solution in brain astrocytoma cell.
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The Effect of Cervical Sympathetic Nerve Block on Blood-brain Barrier Disruption with Mannitol Infusion in Rats
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Bong Ki Moon, Soo Han Yoon, Young Joo Lee, Chul Ryung Hur, Chang Ho Kim, Sung Jung Lee, Young Seok Lee
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Korean J Crit Care Med. 1997;12(1):69-74.
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- BACKGOUND: The barrier can be altered by a number of insults to the brain (e.g., hypertension, freezing, trauma, drug).
But the effect of the blood brain barrier distruction immediately after the neural change is unknown. In the present study, we focused on the BBBD after cervical sympathetic chain block.
METHODS
13 male Sprague-Dawley rats were divided into 2 groups. Group 1 (N=7) was blocked with 0.5% bupivacaine on the right cervical sympathetic chain and group 2 (N=6) was blocked with 0.5% bupivacaine on the bilateral cervical sympathetic chain. All rats received 37degrees C, 25% mannitol (1.75 g/kg) via right carotid artery and then, the effect of cervical sympathetic chain block on blood-brain barrier disruption of four cerebral compartment using 99mTc-human serum albumin and Evans blue was evaluated.
RESULTS
Both groups showed blood-brain barrier disruption and there was no significant difference between group 1 and group 2 in the anterior and posterior hemisphere of the right side brain. But group 2 showed significant blood-brain barrier disruption than group 1 in anterior and posterior hemisphere of the left brain (p<0.01).
CONCLUSIONS
This results suggest that cervical sympathetic chain block can increase the degree of mannitol-induced blood-brain barrier disruption via neural arch or blood flow change.
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