Occurs when numerous unorganized ectopic foci in the atria discharge impulses at rates of 400-500 bpm causing the atria to quiver instead of contracting regularly. The ventricles respond only to those impulses which pass through the AV node.
An atrial arrhythmia characterized by a rapid atrial rate of 250-350 bpm which is triggered by ectopic impulses or reentry conduction.
The rate of ventricular tachycardia can vary from 120-200 bpm. Ventricular tachycardia is the result of ectopic foci stimulating the ventricle causing it to beat out of control.
Even though the ventricles are contracting, it causes a reduction in ventricular filling as well as reducing cardiac output.
Each l mm represents 0.04 seconds. The distance between the darker lined boxes in a horizontal direction represents 5 x 0.04 seconds or 0.2 seconds. Therefore, 25 small boxes (5 large boxes) pass through the machine every second. One large box (made up of 5 small boxes) equals 1/5 (0.20) second. Locate a reference point P-wave, R-wave etc. which falls on a dark line on the ECG paper. If the peak of an R-wave (or any other reference point), falls on each dark vertical line on a strip, that would indicate a rate of 5 large boxes per second times 60 seconds per minute.
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