Exploring the physiological and metabolic demands of passive ergometry in the critical ill patient.
This study explores the physiological and metabolic demands of passive ergometry as a step in active rehabilitation and compares two methods of monitoring these changes in critically ill patients.
Study Type
OBSERVATIONAL
Enrollment
12
Physiological demands of early passive ergometry use in the critically ill patient.
Haemodynamic measurements collected were arterial systolic and diastolic blood pressure (SBP/DBP mmHg).
Time frame: Minute by minute measurements were taken over the 60 minute data collection period.
Physiological demands of early passive ergometry use in the critically ill patient.
Haemodynamic measurements collected were heart rate (HR beats/min).
Time frame: Minute by minute measurements were taken over the 60 minute data collection period.
Physiological demands of early passive ergometry use in the critically ill patient.
Haemodynamic measurements collected were cardiac output (CO L/min).
Time frame: Minute by minute measurements were taken over the 60 minute data collection period.
Physiological demandsof early passive ergometry use in the critically ill patient.
Respiratory measurements collected were stroke volume (SV m/L).
Time frame: Minute by minute measurements were taken over the 60 minute data collection period.
Physiological demands of early passive ergometry use in the critically ill patient.
Respiratory measurements collected were respiratory rate (RR breaths/min).
Time frame: Minute by minute measurements were taken over the 60 minute data collection period.
Physiological demands of early passive ergometry use in the critically ill patient.
Respiratory measurements collected were minute volume (MV L/min) and tidal volume (VT L/min).
Time frame: Minute by minute measurements were taken over the 60 minute data collection period.
Physiological demands of early passive ergometry use in the critically ill patient.
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Metabolic measurements collected were oxygen delivery (DO2 m/L) and oxygen uptake (VO2 m/L).
Time frame: Minute by minute measurements were taken over the 60 minute data collection period.
Physiological demands of early passive ergometry use in the critically ill patient.
Metabolic measurements collected were central venous oxygen saturation (ScvO2 %).
Time frame: Minute by minute measurements were taken over the 60 minute data collection period.
Physiological demands of early passive ergometry use in the critically ill patient.
Metabolic measurements collected were CO2 production (VCO2 mL/min).
Time frame: Minute by minute measurements were taken over the 60 minute data collection period.
Physiological demands of early passive ergometry use in the critically ill patient.
Paired venous and arterial blood gas samples were collected.
Time frame: These were taken every 10 minutes over the 60 minute data collection period.
Comparing two methods of measuring oxygen uptake (VO2 mL/min) and oxygen delivery (DO2 mL/min) during one passive ergometry session in the critically ill patient.
Oxygen uptake (VO2) was calculated by two methods. 1. Method one calculated VO2 with the value of CO from the LiDCO™ using the modified technique of the Fick equation using paired central mixed venous and arterial blood gas samples: VO2 mL/min = CO x (CaO2 - CvO2) x10. 2. Method two calculated VO2 by the E-COVX metabolic module via the ventilator from the value of fraction of inspired O2 (FiO2), expiratory minute volume (MV), expired concentrations of O2 (FeO2) and CO2 (FeCO2) using the equation: VO2 ml/min= MV (FiO2 -FeO2 - FiO2 (FeCO2))/1-FiO2.
Time frame: Minute by minute haemodynamic and metabolic measurements were taken over the 60 minute data collection period. Paired venous and arterial blood gas samples were taken every 10 minutes over the 60 minute data collection period.