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Digitale Medien

Inspiratory pressure/maximal inspiratory pressure ratio: a predictive index of weaning outcome (1993)

Yang, K. L.

Springer

Intensive care medicine 19 (1993), S. 204-208

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ISSN: 1432-1238

Schlagwort(e): Weaning prediction ; Ventilator ; Weaning index ; Rapid shallow breathing ; Breathing pattern

Quelle: Springer Online Journal Archives 1860-2000

Thema: Medizin

Notizen: Abstract Objective To compane the accuracy of PI/ PImax ratio and other commonly used indices in predicting weaning outcome. Design A prospective study. Setting Intensive care unit. Patients 31 stable intubated patients ready to undergo weaning trial. Methods A simple method was developed to measure the PI and PImax in intubated patients. The accuracy of PI/PImax ratio and other commonly used indices in predicting outcome were compared. All indices were measured prior to weaning trial using standardized methods. Measurements and results Minute ventilation of the successful patients (13.00±0.67 (SE) l/min) was not significantly different from the failure patients (10.64±1.26 l/min,p=0.10). The PI and PImax for the successful patients (11.48±1.25 cmH2O and 47.77±4.48 cm H2O, respectively) and the unsuccessful, patients (14.32±2.31 cmH2O and 40.16±4.55 cmH2O respectively) were also not significantly different (p=0.28 and 0.24 respectively). The PI/PImax ratio was lower for the weaning successes (0.26±0.03) than for the weaning failures (0.36±0.04,p〈0.05). The threshold value of 0.3 for PI/PImax provided the best separation between weaning success and failure patients. The combined usage of rapid shallow breathing index and PI/PImax ratio provided the highest accuracy with sensitivity of 0.81 and specificity of 0.93. Conclusion The PI/PImax ratio provided a good separation between the patients who were successfully weaned and those who failed. It provides additional discriminative power to f/VT.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF01694771

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Digitale Medien

Evaluation of capillary gas chromatography for the measurement of hydrocarbons by participating in an intercomparison experiment (1997)

Yang, K. L. ; Lo, J. G.

Springer

Chromatographia 44 (1997), S. 405-410

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ISSN: 1612-1112

Schlagwort(e): Gas chromatography ; Tenax-TA sampling ; Thermal desorption ; Preconcentration ; Flame ionization detection

Quelle: Springer Online Journal Archives 1860-2000

Thema: Chemie und Pharmazie

Notizen: Summary By participating in an International Hydrocarbons Intercomparison Experiment, a method for the determination of nonmethane hydrocarbons was evaluated. The method involves Tenax-TA sampling, thermal desorption and preconcentration combined with capillary gas chromatography with flame ionization detection. Sixty target compounds from C2 to C11 were separated by using a megabore capillary column with a thick film of bonded nonpolar siloxane stationary phase (5 μm, Rtx-1). The unusually thick film in the column was an advantage for resolving light hydrocarbons (C2−C3) at room temperature. The percent difference between the National Institute of Standards and Technology (NIST) and our laboratory in the intercomparison experiment is in the range of 0.99%–19.70%.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF02466318

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