Journal of clinical monitoring and computing
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J Clin Monit Comput · Apr 2002
Xenon washout during in-vitro extracorporeal circulation using different oxygenators.
Xenon anesthesia is known to have no adverse influence on myocardial contractility and cardiocirculatory function even in cardiac compromised patients. To make use of this advantages for cardiac surgery patients undergoing extracorporeal circulation (ECC) it must be known if oxygenators are diffusible for xenon in order to avoid losses of the very expensive noble gas. ⋯ Using common oxygenators xenon is eliminated during ECC and lost into the atmosphere. To maintain anesthesia during ECC continuous xenon application would be necessary to compensate these losses. Due to its high price it would be too expensive to continue xenon anesthesia during ECC. Therefore it is not practicable to use the today's oxygenators and ECC equipment in xenon anesthesia.
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J Clin Monit Comput · Apr 2002
Automated evaluation of functional residual capacity by oxygen washout.
Measurement of functional residual capacity (FRC) is of considerable interest for monitoring ventilated patients in ICUs. However, the lack of instruments that can be used in the clinical setting has so far impeded the routine application of this measurement. It was the aim of our study to evaluate the accuracy and the reproducibility of a simplified oxygen washout technique (FRC[O2]). ⋯ The automated oxygen washout technique is a simple method to measure FRC in the ICU patient.
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J Clin Monit Comput · Apr 2002
A prototype device for standardized calibration of pulse oximeters II.
There is no commonly accepted in vivo calibration method for pulse oximeters available up to now. On the basis of a prototype device for the calibration of pulse oximeters which was introduced recently, a second approach based on the same concept was tackled in order to design a reliable method for standardized calibration of pulse oximeters. ⋯ Compared to the first prototype the current version is simpler and less expensive in production. Many of previously existing problems are solved and the applicability to a large variety of pulse oximeters and sensors is given. The novel concept for the calibration of pulse oximeters is a tool for assessing the performance of pulse oximeters.
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J Clin Monit Comput · Apr 2002
Case ReportsCompartment syndrome of the arm: a complication of noninvasive blood pressure monitoring during thrombolytic therapy for myocardial infarction.
We report a rare case of tricep compartment syndrome caused by a hematoma which resulted from noninvasive blood pressure monitoring (NIBPM) during thrombolytic therapy. Clinicians administering thrombolytic agents should be aware of the risk of bleeding and compartment syndrome at the site of NIBPM. Appropriate preventative measures should be instituted when using automated pneumatic cuffs. An understanding of the pathophysiology and clinical presentation of an arm compartment syndrome will allow for prompt diagnosis and surgical treatment.
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J Clin Monit Comput · Apr 2002
Mycardial ischemia and determined chaos in integral homeostatic regulation.
This study was devoted to the problem of homeostatic stability loss caused by myocardial ischemia, induced by stress testing. It involved 55 patients with different variants of coronary heart disease and 15 practically healthy volunteers as controls. Routine bicycle ergometry and nonstop monitoring of the cardiac-interval duration were conducted simultaneously. ⋯ Determined chaos was shown to be the main property of these dynamics in all cases. The original method of measuring the cardiac rhythm entropy chaotisity level is presented. It is suggested that the newly revealed phenomenon of a sharp rise in the cardiac entropy trajectory chaotisity level and followed by a decrease, which happens in the multidimensional phase space, may be used as an additional criterion of myocardial ischemia development for the verification of dubious stress-testing results.