On-line processing of orthogonal exercise electrocardiograms

Electrocardiograms of healthy men after strenuous exercise.

Between August 1954 and May 1957, 682 R.A.F. officers and men volunteered for a study of the electrocardiogram after exercise. Of these, 660 were selected because they had no symptoms, no clinical or radiological evidence of heart disease, a diastolic blood pressure of below 100 mm. Hg, and a normal 12-lead electrocardiogram taken at rest. Certain minor electrocardiographic changes that are bel...

Normal measurements of modified Frank corrected orthogonal electrocardiograms and their importance in an on-line computer-aided electrocardiographic system.

We have used a computer-aided i5-lead hybrid electrocardiographic system to obtain normal measurements throughout life for men and women in different age groups. Amplitude and duration of the P, QRS, and T wave in the modified Frank orthogonal leads were determined. The range ofmany of these observations was greater than that usually accepted; in particular, the PR interval could be as low as I...

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

The influence of constitutional variables on orthogonal electrocardiograms of normal women.

Correlations between 276 orthogonal electrocardiographic measurements and constitutional variables were made in 450 normal women, aged 18 to 90 years. Advancing age led to decreases in amplitudes, left QRS axis shift, rightward and superior displacement of the ST segment, and anterior shift of the T wave. QZ was absent in 1% of normal women over age 40. In the oldest subjects, Ry amplitude was ...

On-Line Analytical Processing

DEFINITION On-line Analytical Processing (OLAP) describes an approach to decision support, which aims to extract knowledge from a data warehouse (see Data Warehouse definitional entry), or more specifically, from data marts (see Data Mart definitional entry). Its main idea is providing navigation through data to non-expert users, so that they are able to interactively generate ad-hoc queries wi...