Search PubMed⌕ Search

SEARCH · Search PubMed

Results for “MONITORING SYSTEMS”

Search indexed PubMed citations on genomics, clinical trials, systematic reviews and public health. Explore titles, authors and supplied subject terms, then open the PubMed record.

Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.

At least 559 records · Page 31Linked to original sources
PubMed1998

Detection of myocardial ischemia with a computer-assisted 12-lead 24-hour ECG monitoring system (EAGLE) in patients with suspected unstable angina.

This study was undertaken to evaluate the diagnostic value of a new device, the 'EAGLE' computer-assisted multiple-lead long-term electrocardiography (ECG) monitoring and analyzing system, in patients with suspected unstable angina, and to compare the results with the Holter monitor. A total of 101 patients with a history of suspected unstable angina underwent a simultaneous 24-h examination with the EAGLE and 2-channel Holter monitors. The diagnosis of unstable angina was established in 70 patients: 41 had significant organic stenosis, and 29 had coronary spasm. Ischemic ST deviations were detected 229 times in 44 patients (62.9%) with the EAGLE system and 101 times in 20 patients (28.6%) with the Holter monitor. The sensitivity of myocardial ischemia in unstable angina with the EAGLE system was significantly higher than that with Holter monitor (62.9 vs 28.6%, p<0.05). The difference of sensitivity was due mainly to the low detection rate of the Holter monitor for asymptomatic myocardial ischemia (EAGLE vs Holter; 187 times vs 72 times) and myocardial ischemia in the infero-posterior area in patients with organic stenosis (30 times vs none). It is concluded that the EAGLE system is a sensitive tool for the diagnosis of unstable angina in patients without significant ECG changes, and an excellent tool for evaluating silent myocardial ischemia or myocardial ischemia of the infero-posterior area.

Angina, Unstable↗
PubMed1991

A comparison of facial nerve monitoring systems in cerebellopontine angle surgery.

The use of peripheral nerve monitoring during skull base surgery is becoming a more common procedure. One widely used method (Jako) detects surface muscle contraction, which can be transduced into an audible signal. A 200 microsecond square wave current can be delivered periodically, in order to identify the nerve and verify its integrity. Another monitoring method has been developed, which provides a continuous audible needle electromyographic (EMG) feedback signal from computer averaging of a monopolar low impedance constant voltage stimulus. This study compares facial nerve preservation and postoperative facial nerve function results of three groups of cerebellopontine angle surgical cases: 38 cases performed with no monitoring; 29 cases done with Jako motion detection monitoring; and 41 performed with evoked needle EMG audible feedback monitoring. Postoperative facial nerve function is evaluated using the House-Brackmann grading system. Each of the three study groups are matched for a time at which postoperative evaluation was made. Analysis of results reveals that in addition to the expected increase in facial nerve preservation rates when monitoring is in use, the near real-time feedback provided by audible evoked EMG results in a significant reduction in permanent postoperative facial nerve dysfunction. Using evoked monitoring, a greater proportion of the cases had a final outcome of class I or II results, compared to those cases performed using Jako motion detection monitoring.

Cerebellar Neoplasms↗
PubMed1995

Clinical validation of the Deltatrac monitoring system in mechanically ventilated patients.

OBJECTIVE: To evaluate a monitor of pulmonary gas exchange (Deltatrac, Datex) in a clinical setting. DESIGN: After in vitro evaluation, comparison over 2 min between VO2 and VCO2 values measured by the Deltatrac and the Douglas bag technique. Comparisons were also achieved over 8 h periods between the Deltatrac and a system using a mass-spectrometer. SETTING: Polyvalent intensive care unit (ICU 15 beds) in a 1200 bed general hospital. PATIENTS: Comparison with the Douglas bag technique in 10 patients undergoing controlled ventilation. Comparison with the mass-spectrometer system in 25 other patients undergoing controlled or pressure support ventilation. MEASUREMENTS AND RESULTS: Compared to the results obtained by the Douglas bag technique, the bias (+/- 2 SD) for VO2 and VCO2 was -3.5 +/- 26.6 and 6.1 +/- 12.7 ml.min-1, respectively. By comparison with the mass-spectrometer system, the bias for VO2 and RQ was -5.8 +/- 16.0 ml.min-1 and 0.018 +/- 0.048, respectively. No drift between the two systems was observed over time. CONCLUSIONS: The Deltatrac appears suitable for VO2 and VCO2 measurements in ventilated patients and equivalent to a mass-spectrometer system for long term measurements.

Analysis of Variance↗
PubMed1997

Monitoring systemic venous oxygen saturations in the hypoplastic left heart syndrome.

Although progress has been made in treating hypoplastic left heart syndrome, improvements in perioperative care may further decrease mortality. We present a case in which continuous monitoring of systemic venous oxygen saturation allowed stabilization and successful management of a critically ill infant. Systemic venous oxygen saturation may provide a more accurate representation of a child's clinical status, allowing more rapid intervention and better outcomes.

Blood Vessel Prosthesis↗
PubMed1996

Development of an affordable hi-resolution activity monitor system for laboratory animals.

We describe a hardware and software system for recording and analyzing the spatial and temporal pattern of locomotor activity of laboratory animals. The system offers maximal spatial resolution 500-fold greater than existing light beam monitors. An infrared motion analysis systems (MacReflex, Qualysis) simultaneously tracks the location of up to 20 subjects (identified by reflective markers) to within 0.04 mm at a rate of up to 50 Hz. Macintosh software provides measures of distance traveled, amount of area traversed, number of position changes (microevents), average time between movements, number of left and right turns, number of forward movements and reversals, as well as temporal and spatial scaling exponents. This system was validated by comparing these parameters to direct observer scoring of video tapes and other commercially available activity monitors. Our findings show that applying reflective markers to the subjects does not significantly alter activity levels. The effect of pharmacological manipulation with d-amphetamine is provided to show the value of the different activity parameters. The main advantages of this system are very high spatial resolution, capacity to monitoring up to 20 animals simultaneously at reasonable cost, and lack of sensitivity of the system to ambient lighting. The main limitation is the need to apply reflective markers.

Animals↗
PubMedDate not supplied

Hospital telemetry monitoring systems.

Hospital cardiac care systems frequently provide multiple-channel cardiac monitoring by telemetry for a second phase of cardiac recuperation from a myocardial infarction. This article describes the engineering and clinical considerations in selecting, designing, and operating telemetry systems in a clinical setting.

Coronary Care Units↗
PubMed1998

Central nervous system monitoring during open heart surgery: an update.

Electroencephalography (EEG) is used to monitor the function of the central nervous system in a variety of surgical procedures. During cardiac surgery with cardiopulmonary bypass, ischemic changes on the EEG as a result of impaired central nervous system blood supply can be noted. The EEG also may be used to monitor the functional state of the brain during and after profound hypothermic circulatory arrest. If a desired goal is to reduce cerebral metabolism using a barbiturate or other such agent, the EEG can be monitored to provide a measurable pharmacodynamic end point (burst suppression). Techniques have been developed to process the EEG signal using a computer and to improve on-line interpretation. These include fast Fourier transformation to develop a three-dimensional plot or compressed spectral array, evoked-potential monitoring, and bispectral analysis to derive a univariate descriptor of the EEG. These techniques have been used to detect awareness and indirect memory function, as well as to assess the adequacy of anesthesia. There is a good correlation between implicit memory and alterations in midlatency auditory-evoked responses. The bispectral index has been used to assess the adequacy of anesthesia as well as to detect awareness. Preliminary studies suggest that titrating the anesthetic to bispectral index levels may be useful during cardiac surgery.

Anesthetics, General↗
PubMed1993

Effectiveness of glucose monitoring systems modified for the visually impaired.

OBJECTIVE: To compare three glucose meters modified for use by individuals with diabetes and visual impairment regarding accuracy, precision, and clinical reliability. RESEARCH DESIGN AND METHODS: Ten subjects with diabetes and visual impairment performed self-monitoring of blood glucose using each of the three commercially available blood glucose meters modified for visually impaired users (the AccuChek Freedom [Boehringer Mannheim, Indianapolis, IN], the Diascan SVM [Home Diagnostics, Eatontown, NJ], and the One Touch [Lifescan, Milpitas, CA]). The meters were independently evaluated by a laboratory technologist for precision and accuracy determinations. RESULTS: Only two meters were acceptable with regard to laboratory precision (coefficient of variation < 10%)--the Accuchek and the One Touch. The Accuchek and the One Touch did not differ significantly with regard to laboratory estimates of accuracy. A great discrepancy of the clinical reliability results was observed between these two meters. The Accuchek maintained a high degree of reliability (y = 0.99X + 0.44, r = 0.97, P = 0.001). The visually impaired subjects were unable to perform reliable testing using the One Touch system because of a lack of appropriate tactile landmarks and auditory signals. CONCLUSIONS: In addition to laboratory assessments of glucose meters, monitoring systems designed for the visually impaired must include adequate tactile and audible feedback features to allow for the acquisition and placement of appropriate blood samples.

Adult↗