Journal of clinical monitoring and computing
-
J Clin Monit Comput · Aug 2007
Comparative StudyCardiac output derived from left ventricular pressure during conductance catheter evaluations: an extended Modelflow method.
The Modelflow method computes cardiac output (CO) from arterial pressure (CO-MFao) by simulating a non-linear three-element Windkessel model of aortic input impedance. We present a novel technique to apply the Modelflow method to the left ventricular pressure (Plv) signal, to obtain an estimation of CO (CO-MFlv). ⋯ Cardiac output estimates by the modelflow method from aortic pressure and left ventricular pressure are interchangeable in patients without mitral and aortic abnormalities. After an initial calibration, CO-MFlv presents near zero bias and an adequate precision.
-
J Clin Monit Comput · Aug 2007
Summative software evaluation of a therapeutic guideline assistance system for empiric antimicrobial therapy in ICU.
While developing the patient data management system ICUData in close cooperation with the software company (IMESO GmbH, Hüttenberg, Germany), a therapeutic guideline assistance system for empiric antimicrobial therapy in ICU (called "Antibiotic Wizard") could be introduced and integrated into the existing software. After its introduction into clinical routine, the first version was to be tested, checked for usability and compared to other software products with the help of the IsoMetrics(s) inventory (based on the EN ISO 9241-10 for computer-assisted workflows). ⋯ In generally, the usability of the "Antibiotic Wizard" was deemed good. Some weaknesses were found in the fields of "Error tolerance" and "Controllability". These problems will be corrected in future versions.
-
J Clin Monit Comput · Aug 2007
Blood gas measurements using the Bayer Rapid Point 405: are we basing our decisions on accurate data?
Therapeutic decisions in the Operating Room (OR) are often made based solely upon results obtained from arterial blood gas machines. We evaluated how precise and accurate the results obtained from Bayer Rapid Point 405 (RP405) were vis-à-vis those of our blood gas laboratory and if they met the standards of the members of the anesthesia department. ⋯ Anesthesiologists must be confident that the information they receive is accurate in the context of rapidly changing clinical status. Our results show that the RP405 analyzers produce reliable measurements.
-
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.
-
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.