The Science Journal of the American Association for Respiratory Care
INTRODUCTION: Inadequate humidity of inspired gases through an artificial airway adversely affects patient outcomes from retained secretions and damage to lung mucosa. The passive HME/HCH has replaced water-filled heated humidifiers in many clinical settings. Recently, a self-contained chemically heated, active HME/HCH has been developed. The Thermax
Methods: The Human Investigation Committee permitted the study without informed consent since we were comparing FDA approved products. Patients undergoing first time, non-emergency, coronary artery bypass surgery, having good ventricular function, were randomly assigned either a standard HME/HCH or the T HME/HCH at the completion of surgery. We hypothesized that the T would increase core temperature more quickly and that this would improve coagulation and hasten extubation. Blood loss, time to extubation, body temperature, dynamic airway pressures and flows, and number of HME change outs were recorded until extubation. Quality and quantity of secretions were noted. Initial rate of temperature rise and added resistance of the humidifier at extubation was calculated. 24 patients in the G group and 22 patients in the T group completed the study. Continuous values were compared using T tests.
|HME/HCH||Initial Temp Rise||Blood Loss||Time to Extubation||Added Resistance|
|Gibeck ||0.0699 ||382 ml||8.54 hr||0.0899 cmH2O |
|Thermax ||0.269 ||429 ml||10.12 hr||0.0956 cmH2O |
Only the rate of rise of body temperature was different between the groups. No device needed changing due to accumulation of secretions.
Conclusions: The Thermax