Journal of clinical monitoring and computing
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J Clin Monit Comput · Jun 2007
Importance and interpretation of fast-response airway hygrometry during ventilation of anesthetized patients.
Measurement of oxygen uptake (Vo2) should help detect non-steady state critical events and metabolic derangement during anesthesia. Vo2 requires measurement of respiratory relative humidity (RH) and temperature (T). We have developed a fast response T and humidity sensor (HS), which uses tiny wet and dry thermometers to determine RH by psychrometry, where low RH causes evaporation to decrease wet T below dry T. In laboratory bench studies, we determined that >/=5 l/min gas flow through the HS is required for valid psychrometry function. This study demonstrates that monitoring of flow through the HS enhances the accuracy of RH measurement and interpretation. ⋯ We conclude that airway flow monitoring enhances the interpretation and accuracy of the fast-response HS measurements during inspiration and expiration, allowing for the determination of Vo2 in patients during anesthesia.
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J Clin Monit Comput · Jun 2007
Corrected incidences of co-morbidities - a statistical approach for risk-assessment in anesthesia using an AIMS.
In anesthesia and intensive care logistic regression analysis are often used to generate predictive models for risk assessment. Strictly seen only independent variables should be represented in such prognostic models. Using anesthesia-information-management-systems a lot of (depending) information is stored in a database during the preoperative ward round. The objective of this study was to evaluate a statistical algorithm to process the different dependent variables without losing the information of each variable on patient's conditions. ⋯ Due to reduced calibration, the clinical use of the prediction model is limited.
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J Clin Monit Comput · Jun 2007
Accuracy of a novel approach to measuring arterial thermodilution cardiac output during intra-aortic counterpulsation.
To assess the agreement between a novel approach of arterial and the pulmonary artery bolus thermodilution for measuring cardiac output in critically ill patients during aortic counterpulsation. ⋯ Agreement between BCO(iabp) and BCO(pulm) was satisfactory for CO values between 2.0 and 10 l/min only without aortic counterpulsation. BCO(iabp) CO measurements during aortic counterpulsation after coronary artery bypass grafting cannot be recommended at the present time.
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J Clin Monit Comput · Jun 2007
Use of radio frequency identification (RFID) tags in bedside monitoring of endotracheal tube position.
Improper positioning of the endotracheal tube during intubation poses a serious health risk to patients. In one prospective study of 219 critically ill patients, 14% required endotracheal tube repositioning after intubation [Brunel et al. ⋯ RFID technology has already been approved for use in humans as a safe and effective tool in a variety of applications. The use of handheld RFID detectors and RFID tag-labeled endotracheal tubes could allow for easy and accurate bedside monitoring of endotracheal tube position, once initial proper placement is confirmed.