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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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 Abstract
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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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Evaluation of Weaning Criteria from Mechanical Ventilatory Support
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Young Joo Lee, Haeng Jae Kim, Taeg Hwan Bae, Sang Kun Han, Keum Hee Chung, Jang Wun Yun, Jae Woo Jin, Chol Kim
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Korean J Crit Care Med. 1998;13(1):79-84.
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Abstract
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- Introduction: A number of indices have been proposed as accurate predictors of weaning, but several studies have questioned the accuracy of these weaning indices in predicting the capability of independent breathing. The purpose of the study was to assess six standard bedside weaning criteria of mechanically ventilated patients in Surgical intensive care unit (SICM).
METHOD
: The study was performed on 72 SICU patients who were mechanically ventilated. According to the outcome of weaning, they were divided into two groups, weaning success (n=62) and weaning failure (n=10) group. All subjects should have PaO2 above 60 mm Hg at an FIO2 of 0.4 and PEEP of 3~5 cm H2O in the extubated patients and no PEEP in the tracheostomy patients. Six bedside weaning criteria were tidal volume above 5 ml/kg, respiratory rate below 25/min, vital capacity above 10 ml/kg, maximum inspiratory pressure below -20 cm H2O, minute volume below 10 L/min and PaO2/FIO2 above 200. Weaning failure was regarded as follows; changes of systolic blood pressure 20 mm Hg or diastolic pressure 10 mm Hg, changes of pulse rate 20 beat per minute, respiratory rate above 30 per minute or increased respiratory rate above 10 per minute, PaO2 below 60 mm Hg or PaCO2 above 55 mm Hg, and presence of paradoxical respiratory pattern.
RESULTS
PaO2/FIO2 and minute volume (VE) were showed statistically significant difference between two groups (P=0.048, P=0.003 respectively). Linear discriminant function was D=-1.422-0.005-xPaO2/FIO2+0.336xVE.
CONCLUSION
Our study demonstrates that PaO2/FIO2 and minute volume accurately predicts the weaning outcome in the surgical patients with mechanical support.
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Statistical Analysis of the Patients in the ICU by Using the APACHE II Scoring System
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Young Joo Lee, Keum Hee Chung, Hyun Jue Gill, Kyung Jin Lee, Sang Hyun Kim, Chang Whan Cho, Young Suk Lee
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Korean J Crit Care Med. 1998;13(1):73-78.
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Abstract
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- Introduction: The APACHE II scoring system has been promulgated as a useful tool in the assessment of the severity of disease and prognosis for patients with acute-on-chronic medical conditions. The purpose of this study was to assess the statistical association of APACHE II score and multiple variables in ICU patients.
METHODS
Prospective data on 803 ICU patients for validation of the APACHE II system were analysed. We evaluated the relationship between APACHE II scores within the first 24 hours of ICU admission and multiple variables that included days in the ICU, mortality rate and age. The patients were classified as operation and nonoperation, survival and nonsurvival groups.
RESULT
1) The APACHE II score was significantly higher in the 153 nonsurvivals (23.97+/-10.98) than in the 651 survivals (11.51+/-6.14) (p<0.05). 2) The mean APACHE II score of the nonoperation group (14.52+/-9.29) was significantly higher than operation group (12.40+/-7.30) (p<0.05). 3) The overall mortality rate was 17.8%. 4) All patients with an APACHE II score over 40 died.
CONCLUSION
The APACHE II score is statistically related with the mortality of critically ill patients.
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