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The ECG in Figure-1 -- was obtained from a person with palpitations. Root causes of tachycardia (tachyarrhythmia) with narrow QRS complexes (QRS period Sinus rhythm (which is the normal rhythm) has the adhering ecg interpretation training uk to features: (1) heart price 50-100 beats per min; (2) P-wave comes before every QRS complicated; (3) the P-wave declares in lead II and (4) the PR period is constant.

Root causes of tachycardia (tachyarrhythmia) with slim QRS complicateds (QRS period Sinus rhythm (which is the normal rhythm) has the adhering to characteristics: (1) heart price 50-100 beats per min; (2) P-wave comes before every QRS facility; (3) the P-wave is positive in lead II and (4) the PR interval is consistent.

Root causes of tachycardia (tachyarrhythmia) with slim QRS complexes (QRS period Sinus rhythm (which is the regular rhythm) has the following features: (1) heart price 50-100 beats per min; (2) P-wave precedes every QRS facility; (3) the P-wave is positive in lead II and (4) the public relations period is consistent.