Paroxysmal SVT and Macroentrant tachycardias Flashcards
Most common form of paroxysmal SVT
AVNRT
Simultaneous atrial and ventricular contraction results in atrial contraction against a closed TV producing ____ wave
Canon A wave
Most forms of AVNRT utilize a ____ conducting AV nodal pathway (____ extension_
slowly; right inferior
Medications that may be used to facilitate termination
Beta blockers, verapamil, diltiazem
narrow QRS tachycardia usually with VA block such that AV dissociation is present
Junctional tachycardia
Diseases associated with accessory pathways (4)
Ebstein anomaly
some forms of HOCM including PRKAG2 mutation
Danon’s dsease
Fabry’s disease
Most common tachycardia caused by an accessory pathway
PSVT designated as orthodromic AV reciprocating tachycardia
Location of p waves in APs that will lead to negative P wave in inferior leads
posteroseptal
Most common mechanism of preexcited tachycardias
ANTIdromic reciprocating tachycardia
Why should adenosine be used cautiously in px with WPW
it may precipitate AF
Other name for flutter that has a counterclockwise direction
Cavotricuspid isthmus dependent
Typical/ Common atrial flutter
produces NEGATIVE flutter waves in inferior leads
often occurs in association with AF
Catheter ablation of cavotricuspid isthmus abolishes flutter in ___ % of patients
95%
Medications that may be considered for atrial flutter (4)
sotalol, dofetilide, disopyramide , amiodarone
Therapy for MAT
treat the underlying disease and correcting any metabolic abnormalities
Cardioversion is often ineffective
