Interesting electrocardiograms.

Interesting Electrocardiograms RATE-DEPENDENT BUNDLE BRANCH BLOCK

These electrocardiograms were taken on a 36 yearold man, with no known cardiac abnormality. The twelve-lead tracing, which shows sinus rhythm at rates between 53 and 60/min., has abnormal T waves in Vl V4. A s{rip, using lead V6, shows the interesting phenomenon of rate-dependent left bundle branch block (LBBB). Please. note in this strip that the first four sinus beats have normal QRS-T waves....

Preoperative electrocardiograms: patient factors predictive of abnormalities.

BACKGROUND Age is often the sole criterion for determining the need for preoperative electrocardiograms. However, screening electrocardiograms have not been shown to add value above clinical information. This study was designed to determine whether it is possible to target electrocardiograms ordering to patients most likely to have an abnormality that would affect management and if age alone is...

Intelligent computer reporting 'lack of experience': a confidence measure for decision support systems.

The purpose of this study was to explore the feasibility of developing artificial neural networks that are able to provide confidence measures for their diagnostic advice. Computer-aided decision making can improve physician performance, but many physicians hesitate to use these 'black boxes'. If we are to rely upon decision support systems for such tasks as medical diagnosis it is essential th...

Canadian Colloquium on Computer-Assisted Interpretation of Electrocardiograms. V. Suggested standards for instrumentation in computer processing of electrocardiograms.

Ordinal pattern statistics for the assessment of heart rate variability

The recognition of all main features of a healthy heart rhythm (the so-called sinus rhythm) is still one of the biggest challenges in contemporary cardiology. Recently the interesting physiological phenomenon of heart rate asymmetry has been observed. This phenomenon is related to unbalanced contributions of heart rate decelerations and accelerations to heart rate variability. In this paper we ...

The Application of Radionuclide Infarct Scintigraphy

To evaluate the application of radionuclide infarct scintigraphy to diagnose myocardial infarction after revascularization, we obtained postoperative technetium 99m pyrophosphate myocardial scintigrams, serial electrocardiograms and CPK-MB isoenzymes in ten control and 51 revascularized patients. All control patients had negative electrocardiograms and scintigrams, but eight had positive isoenz...