Articles: monitoring.
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A study has been made of the accuracy of a computerized system of arrhythmia monitoring in the coronary-care unit of the Palo Alto Veterans Administration Hospital. The system provides beat-to-beat analysis of cardiac rhythm and QRS morphology and stores information for display of incidence of abnormalities and trend curves. The variables monitored by the system include: (1) heart rate, (2) early beats, (3) late beats, (4) abnormal QRS waveforms, and combinations of 2, 3, and 4. ⋯ Computer classification accuracy was as follows: false positives (computer diagnosis abnormal but ECG diagnosis normal), 0.10 per cent (191 complexes) of all complexes and 1.56 per cent of true positives. False negatives (computer diagnosis normal but ECG diagnosis abnormal), 0.70 per cent (84 complexes) of abnormal beats. Computer monitoring and analysis of seven variables in cardiac rhythm and QRS waveform abnormalities can be performed with a high degree of accuracy using a compact computer system suitable for intensive-care units.
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Hemodynamic monitoring is necessary to assess the state of ventricular performance following myocardial infarction. The methods employed require the insertion of a pulmonary artery catheter and an arterial cannula. With the information obtained thereby, appropriate therapeutic modalities may then be instituted. Hemodynamic monitoring techniques are also invaluable in the diagnosis of mitral regurgitation or ventricular septal defects complicating myocardial infarction.
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Probl Med Wieku Rozwoj · Jan 1975
[Monitoring of cardiac rhythm changes during surgical operations with total cardiopulmonary bypass with haemodilution and hypothermia in infants and small children (author's transl)].
Surgical corrections of some serious cardiovascular anomalies in infants and small children were attempted within the last 2 years; 12 severely ill infants and children below the age of 3 years were operated. All, but one, were below 10 kg of body weight, and in all of them there was a considerable weight deficit, more than 30%. The risk of operation was undertaken because of the ineffectiveness of medical treatment and very bad prognosis. ⋯ At temperatures above 26 degrees C ventricular fibrillation was sometimes preceded by sinus bradycardia, or sinoatrial block/arrest, with an AV nodal rhythm and gradually increasing intraventricular conduction slowing. In some cases high degree AV block appeared. At temperatures of 25-23 centigrades - slow fibrillation appeared, followed usually by a complete cardiac arrest.