Understanding paper speeds Paper output speed is the rate at which the ECG machine produces a trace Standard output is 25mm per second If a different paper speed is used, standard rate calculations will have to be modified appropriately (see other examples below) The standard paper speed is 25mm/sec: 1 SMALL square (1mm) = 0.04 sec (40ms) 5 SMALL squares (5mm) = 1 LARGE square = 0.2 sec (200ms) 5 LARGE squares = 1 second ...
The following headings and prompts can be used as template for ECG-based exam questions. Amjid Rehman (@amjidrehman) has made an easy interactive online template ‘ECG made easier‘ based on the template structure outlined ECG type and recording 12 lead vs rhythm strip, rate (normal 25 mm/s) Calibration (5mm wide, 10mm high = 1mV) Unusual leads – right, posterior, lead grouping format Rate normal 60 – 100/min tachy/bradycardia (SA node) vs –arrhythmia (not SA node) method: 300/RR interval (large squares) or number of QRS complexes x 6 (if 25mm/s) ...