The document discusses various types of narrow complex tachycardia (NCT), which are defined as having a QRS duration less than 120 ms and a heart rate over 100 bpm on an ECG. It describes several supraventricular origins for NCT including sinus tachycardia, atrial fibrillation, atrial flutter, focal atrial tachycardia, junctional tachycardia, atrioventricular nodal reentrant tachycardia (AVNRT), and atrioventricular reentrant tachycardia (AVRT). The document provides details on characteristics such as rates, rhythms, and ECG patterns for each type of NCT.

1. Narrow complex tachycardia
algorithm

2. • The narrow complex tachycardias (NCTs) are defined by the presence
in a 12-lead electrocardiogram (ECG) of a QRS complex duration less
than 120 ms and a heart rate greater than 100 beats per minute
(bpm)
• those are typically of supraventricular origin,

3. • Sinus tachyacardia ( sinys rate >100)
• Physiological sinus tachycardia ( nonparoxysmal in response to appropriate
physiological stimulus. Pathological causes and drugs).
• Inappropriate sinus tachycardia(persistent nonparoxysmal tachycardia during the
day, without secondary systemic causes, due to enhanced automaticity and/or to
abnormal autonomic regulation of sinus node).
• Sinus node re-entry tachycardia ( often nonsustained that are due to re-entry circuit
that incorporates the SA node.)
• Atrial fibrillation ( uncordianted atrial activation with consequent
deterioration of atrial mechanical function )
• Atrial flutter ( organized atrial rhythm with a rate btw 250 and 350 bpm)

4. • Focal atrial tachycardia
• Unifocal
• Multifical ( MAT) three or more dif- ferent morphologic patterns of P waves
and an irregular atrial rate averaging 100 bpm or more (generally lower than
250 bpm). Variations in the PR, PP, and RR intervals are common
• Junctional tachycardia (due to either abnormal automaticity or
triggered activity of the AV node or of the His bundle. regular NCT
with either AV dissociation or one-to-one retrograde conduction AV).
• Automatic junctional tachycardia.
• Nonparoxysmal junctional tachycardia.

5. • AVNRT
• COMMON( SLOW-FAST) : NEG P IN II, III, AVF AND + P IN V1. PR LONGER
• UNCOMMON ( FAST-SLOW): SAME PLUS. RP LONGER.

6. • AVRT