Supraventricular Tachycardia Types
- 1 Which is the most common form of supraventricular tachycardia?
- 2 What is the most common arrhythmia diagnosed in children?
- 3 Most common type of SVT in children –
- 4 Which of the following most difficult to be distinguished electrocardiographically from sinus tachycardia?
- 5 Multifocal atrial tachycardia (MAT)- a type of supraventricular tachycardia –
Which is the most common form of supraventricular tachycardia?
C. Focal Atrial Tachycardia
D. Multi-focal Atrial Tachycardia
(A) In typical atrioventricular nodal reentrant tachycardia (antegrade conduction down the slow atrioventricular nodal pathway and retrograde conduction up the fast pathway), the retrograde P wave may not be seen or may be visible early after the QRS complex.
When visible, it often appears as a pseudo R wave in lead V1.
(B) In atrioventricular reciprocating tachycardia, there is typically a short RP interval, with the timing and morphology of the P wave dependent on the site and conduction velocity of the accessory pathway.
(C) Atrial tachycardia typically produces variable RP and PR intervals because atrioventricular conduction depends on atrioventricular nodal properties and the tachycardia rate.
In atrial tachycardia, the morphology and axis of the P wave are influenced by atrial site of origin and tachycardia mechanism. Short- and long-term therapies are discussed in the text.
(D) Normal sinus rhythm.
What is the most common arrhythmia diagnosed in children?
Most common type of SVT in children –
Which of the following most difficult to be distinguished electrocardiographically from sinus tachycardia?
Multifocal atrial tachycardia (MAT)- a type of supraventricular tachycardia –
- Mostly common in patients with lung disorders, but it can occur after acute myocardial infarction
- Common in older people and is associated with exacerbations of chronic obstructive pulmonary disease (COPD).
- P-waves and P–R intervals are variable due to a phenomenon called wandering atrial pacemaker
- At least three different P-wave formations from the same ECG lead.
- Heart rate exceeds 100 beats per minute