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Patient
Young man 22 years of age, asymptomatic, with no prior history and a normal cardiac ultrasound;
Trace
This is a strictly normal tracing with standard calibration (10 mm/mV) and paper speed (25 mm/s); sinus rhythm with a rate of 68 bpm; normal P-wave: positive in leads I, II, V5, V6 and negative in aVR; normal P-wave axis (35°); normal P-wave duration (80 ms); normal P-wave voltage; fixed and normal PR-interval (140 ms); narrow QRS, normal axis (70°), without abnormal morphology; T-waves with no abnormalities, no significant ST segment elevation or depression and normal QT-interval;
Trace
Same tracing with change in calibration: 5 mm/mV;
Trace
Same tracing with change in calibration: 20 mm/mV;
Trace
Same tracing with change in paper speed: 50 mm/s;
Trace
Same tracing with change in paper speed: 12.5 mm/s;
Exergue
Standard calibration of the ECG is signal gain of 10 mm/mV and graph paper speed of 25 mm/s.
The recording of an electrocardiogram is carried out on graph paper which moves at a constant speed. The graph paper is covered by large grid-like squares measuring 5 mm x 5 mm, subdivided into smaller squares of 1 mm x 1 mm.