Common Etiologies of SVT

Atrial

Sinus tachycardia (ST)

Caused by pain, fever, hypovolemia, hypoxia, PE, anemia, anxiety, withdrawal, β-agonists, etc.

Atrial tachycardia (AT)

Originate at site in atria other than SA node. Seen w/ CAD, COPD, ↑ catechols, EtOH, dig.

Multifocal atrial tachycardia (MAT)

↑ automaticity at multiple sites in the atria; seen with underlying pulmonary disease

Atrial flutter (AFL)

Clockwise or counterclockwise macroreentry, usually w/in right atrium

Atrial fibrillation (AF)

Chaotic atrial activation with rapid, irregular AVN bombardment; often from pulmonary veins

---

AV Jxn

AV nodal reentrant tach (AVNRT)

Reentrant circuit using dual pathways w/in AVN

Atrioventricular reciprocating tachycardia (AVRT)

Reentry using AVN & access. path. May show pre-excitation (WPW) or not (concealed access. path.). Can be ortho or antidromic (vide infra).

Nonparoxysmal junctional tachycardia (NPJT)

↑ jxnal automaticity. May see retro. P, AV dissoc. A/w myo/endocarditis, cardiac surg, IMI, dig.