Instructions for Use
Resting & Stress ECG with seca ct330/331 and seca diagnostic 5.9
5 Appendix
5.1 Values and formulas in the ECG evaluation
Isoelectric segments within the QRS complex.
The isoelectric segments within the QRS complex are included in the Q,
R, or S waves.
The duration of each spike/wave is the same in all 12 channels and is
determined by the channel where the first event (this refers to the
beginning or end of a spike/wave) occurs.
PWC (physical working capacity)
The PWC values indicates the physical ability of a patient at a specific
heart rate. The PWC value is specified in watt/kg (body weight). In seca
diagnostic, the PWC value is determined for a heart rate of 130, 150 and
170. To determine the PWC value, the patient must have a heart rate of
+/- 10 to the reference rate (130, 150 and 170). If the heart rate has not
been precisely achieved, the PWC value will be calculated using
interpolation or extrapolation. Example: If a patient who weighs 100 kg
reaches a heart rate of 170 to 200, the PWC value will be calculated as
follows:
PWC170 = 200 W : 100 kg = 2 W/kg
The PWC predicted values are preset in seca diagnostic and can be
changed under Examination, Stress ECG, Settings, Diagnostic,
Reference values. Click on Save to apply your changes.
MET (metabolic equivalent)
The metabolic equivalent is used to determine the expenditure of energy
during the maximum load. In seca diagnostic, the metabolic equivalent is
calculated as follows:
Treadmill ergometry:
v = max. speed in miles per hour, m = gradient in %.
MET = 1 + (v * 26.8 * (0.1 + m * 0.018)) : 3.5
Bicycle ergometry:
L = max. load in watts, G = weight in kg
MET = 1 + (12 * L) : (3.5 * G)
Calculation of QTc duration
Formula according to Bazett:
Formula according to Fridericia:
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