ACADEMICIAN PUBLISHER SCIENTIFIC RESEARCH BOOK: HEALTH SCIENCES INTERNAL SCIENCES, Ali Kemal Kadiroğlu, Editör, Akademisyen Kitapevi , Ankara, ss.81-92, 2018
Twelve derivation electrocardiography (ECG) obtained both during sinus rhythm
and tachycardia may give important clues about the tachycardia mechanism. Information obtained from ECG may be valuable for clicical diagnosis and may increase
the safety and success of electrophysiological study (EPS) and ablation procedures.
Tachycardia with QRS duration <120 ms is considered to be a ‘narrow QRS complex tachycardia’ and tachycardia with QRS duration ≥ 120 ms is considered to be a
‘wide QRS complex tachycardia’ on surface ECG. Narrow QRS complex tachycardias
are usually of supraventricular origin; however certain rare type ventricular tachycardias (VT) may also manifest themselves with narrow QRS on ECG. Differential
diagnosis for the wide QRS complex tachycardia includes VT, aberrantly conducted
supraventricular tachycardia (SVT) and preexcitation.
In this chapter norrow QRS complex tachycardias will be evaluated and clues from
surface ECG will be emphasized for each type of narrow QRS complex tachycardia.