OBJECTIVE: To assess the in vitro performance of a new device, the Tonocap, for semi-continuous air tonometry of regional PCO2 in the gastrointestinal tract. METHODS: The tonometer consists of an air filled balloon-tipped catheter, connected to a prototype Tonocap system. The tonometer was placed in saline baths at steady-state PCO2's ranging from 0 to 105 torr, to evaluate bias, precision and reproducibility to PCO2 measurements. The response time was defined as the time needed to detect 95% of an instantaneous change in bath PCO2. RESULTS: The bias of the PCO2 measurement (mean +/- SD) was -2 +/- 2% and reproducibility (coefficient of variation) was 2 +/- 1%. The response time was 19 +/- 2 min. CONCLUSIONS: Tonocap air tonometry is simple and eliminates most sources of error associated with conventional saline tonometry. The bias, precision, reproducibility and response time in vitro are consistent with a clinically reliable device.
OBJECTIVE: To assess the in vitro performance of a new device, the Tonocap, for semi-continuous air tonometry of regional PCO2 in the gastrointestinal tract. METHODS: The tonometer consists of an air filled balloon-tipped catheter, connected to a prototype Tonocap system. The tonometer was placed in saline baths at steady-state PCO2's ranging from 0 to 105 torr, to evaluate bias, precision and reproducibility to PCO2 measurements. The response time was defined as the time needed to detect 95% of an instantaneous change in bath PCO2. RESULTS: The bias of the PCO2 measurement (mean +/- SD) was -2 +/- 2% and reproducibility (coefficient of variation) was 2 +/- 1%. The response time was 19 +/- 2 min. CONCLUSIONS: Tonocap air tonometry is simple and eliminates most sources of error associated with conventional saline tonometry. The bias, precision, reproducibility and response time in vitro are consistent with a clinically reliable device.
Authors: G Gutierrez; F Palizas; G Doglio; N Wainsztein; A Gallesio; J Pacin; A Dubin; E Schiavi; M Jorge; J Pusajo Journal: Lancet Date: 1992-01-25 Impact factor: 79.321
Authors: G R Doglio; J F Pusajo; M A Egurrola; G C Bonfigli; C Parra; L Vetere; M S Hernandez; S Fernandez; F Palizas; G Gutierrez Journal: Crit Care Med Date: 1991-08 Impact factor: 7.598
Authors: Rinze W F ter Steege; Sebastiaan Herber; Wouter Olthuis; Piet Bergveld; Albert van den Berg; Jeroen J Kolkman Journal: J Clin Monit Comput Date: 2006-12-19 Impact factor: 1.977