Which structure is normally the dominant pacemaker of the heart, and what is its typical intrinsic rate in a healthy adult?
Cardiac Anatomy Conduction
Question · Easy
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An accessory pathway connecting the atrium directly to the ventricle, bypassing the AV node, is known as which structure?
Question · Medium
Chapter 1: Pre-Procedural Assessment & Patient Preparation
1.1 Procedure Room Preparation, Equipment Verification & Aseptic Readiness
Study guide
Within the AV junction, what is the order of conduction through the AV node compartments before reaching the His bundle?
Question · Hard
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Vagal stimulation primarily slows conduction at which site, and through which receptor?
Which definition correctly describes the effective refractory period (ERP) of cardiac tissue?
On a normal 12-lead ECG, which lead is normally the most negative (smallest R, largest S) when calculating frontal-plane axis using the quadrant method?
Ecg Rhythm Interpretation
1.2 Pre-Procedural Clinical Evaluation, Labs, Consents & The Universal Time-Out
Which 12-lead ECG finding is MOST specific for typical (counterclockwise) cavotricuspid-isthmus-dependent atrial flutter?
A patient presents with regular narrow-complex tachycardia at 180 bpm. After adenosine 6 mg IV push, the rhythm abruptly terminates and reverts to sinus rhythm. The most likely diagnosis is:
Which feature on a 12-lead ECG most strongly favors ventricular tachycardia over SVT with aberrant conduction?
Idiopathic outflow-tract VT arising from the right ventricular outflow tract (RVOT) typically shows which 12-lead morphology?
1.3 Patient Identification, Transport, HIPAA & Procedural Documentation
A polymorphic VT with QRS complexes that twist around the isoelectric line on a long-QT background is BEST described as:
A patient with WPW shows a delta wave that is positive in V1 and positive in the inferior leads (II, III, aVF) on baseline ECG. Which accessory-pathway location is MOST likely?
On a surface ECG, second-degree AV block Mobitz Type I (Wenckebach) is recognized by:
AV nodal reentrant tachycardia (AVNRT) typical (slow-fast) form most commonly shows which surface-ECG feature?
1.4 Patient Monitoring Setup, Defibrillator Pads & Pre-Procedural CIED Interrogation
Atrial fibrillation in a patient with WPW and a pre-excited rapid ventricular response is treated with which of the following?
During an EP study, which catheter position normally records the His-bundle electrogram?
Invasive Ep Study
The AH interval measured on the His-bundle electrogram represents conduction through which structure(s) and has what typical normal range?
A patient undergoing EP study shows an HV interval of 75 ms. This finding indicates:
1.5 Vascular Access Planning, Skin Preparation & Sterile Draping
During incremental atrial pacing, the cycle length at which AV block (failure of 1:1 AV conduction) first occurs is termed:
During programmed ventricular stimulation, the typical drive train cycle length is 600 ms with progressive shortening of an extrastimulus (S2). What is the purpose of using more than one extrastimulus (S2, S3, S4)?
Which vascular access route is MOST commonly used for diagnostic EP catheter placement in the right heart?
A patient with sustained narrow-complex tachycardia at 200 bpm has an RP interval >70 ms with a P-wave morphology different from sinus. Which diagnosis is MOST consistent?
Chapter 2: Cardiac Anatomy, Conduction & Electrophysiologic Foundations
2.1 Cardiac Anatomy for the EP Lab: Chambers, Access Routes & Coronary Supply
When advancing a coronary sinus (CS) catheter from a femoral or jugular approach, the proximal CS electrodes typically record activation arising from which structure(s)?
Decremental conduction (progressive prolongation of conduction time as pacing rate increases) is a hallmark of which structure?
Programmed atrial stimulation reveals a sudden jump in the A2-H2 interval of ≥50 ms with a 10 ms decrement in the A1-A2 coupling interval. This finding is classically diagnostic of:
During SVT in the EP lab, ventricular entrainment yields a V-A-V response after the last paced beat. This response excludes which diagnosis?
2.2 The Cardiac Conduction System, Action Potentials & Ion Channel Physiology
What is the most common ablation target site in the heart for typical (slow-fast) AVNRT?
Ablation Procedures
During slow-pathway ablation for AVNRT, what intra-procedural finding is the strongest signal to immediately STOP RF energy?
The standard ablation strategy for paroxysmal atrial fibrillation in 2026 is:
Pulsed field ablation (PFA) for atrial fibrillation differs from radiofrequency and cryoablation in that PFA primarily acts via:
2.3 Cardiac Vector Analysis, 12-Lead ECG Fundamentals & Axis Determination
Cryoablation is preferred over radiofrequency in which of the following situations?
When ablating a left-sided accessory pathway, the most common access route to the left atrium is:
After PVI for AFib, which finding at the end of the procedure best confirms acute success?
Substrate-based VT ablation in patients with prior MI typically targets:
Chapter 3: EP Lab Instrumentation, Connectology & Lab Safety
3.1 EP Recording System Architecture, Signal Amplification & Frequency Filters
A dual-chamber pacemaker programmed DDD with mode-switch enabled would respond to a sudden onset of atrial fibrillation by:
Implantable Devices
Cardiac resynchronization therapy (CRT) achieves left ventricular pacing primarily by placing the LV lead in:
An ICD detects a ventricular rhythm at 200 bpm and delivers anti-tachycardia pacing (ATP) before any shock. ATP is most effective for:
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