ECG Rounds July 22, 2004 Adam Oster R4
14M with Palpitations:
14M with Palpitations
14M in sinus
Accessory Pathway Syndromes WPW one of many accessory pathway diseases Bundle of Kent Classically 3 features… Accessory pathway has longer refractory period during long cycle lengths (sinus rhythm) Can conduct faster than the AVN MC Tachycardia is orthodromic AVRT (70-80%)
Orthodromic AVRT Usually initiated by PAC Accessory pathway refractory PAC Anterograde conduction down AVN and retrograde up accessory pathway Narrow QRS
AVRT vs AVNRT: Rosen 2002
AVNRT vs AVRT: Journal of the American College of Cardiology. May, 2003.
AVNRT vs AVRT N=148 with ECGs both in narrow-complex SVT and in SR Gold standard was electrophysiologic studies followed by catheter ablation if necessary 3 blinded EPs reviewing for apriori ECG findings
AVNRT vs AVRT
AVNRT
AVNRT
AVNRT vs AVRT Accuracy = 91%
AVNRT
Usefulness of the ST-Segment in aVR American Journal of Cardiology. December, 2003. N=338 in PSVT All had EP studies
The ST-segment in aVR
AVRT
AVRT
Usefulness of the ST-Segment in aVR ST seg elevation in AVR For AVRT Sens 71% Spec 70% Accuracy 70%
AVRT
AVNRT vs AVRT: Putting it All Together Psudo r’ think AVNRT Inferior leads Psuedo S think AVNRT ST up in AVR Think AVRT (but not only)
Management Principles Stability Narrow vs wide Regular vs irregular
AF/antidromic/WCT
WPW: Localising the Pathway LOCATION V1 V2 QRS axis left posteroseptal (type A) +ve +ve left right lateral (type B) -ve -ve left left lateral (type C) +ve +ve inferior (90 degrees) right posteroseptal -ve -ve left anteroseptal -ve -ve normal
Anteroseptal pthwy
Axis
Lt lateral pathway