Sinus Rhythm Lab
Electrophysiology Simulator REC · LIVE
00:00
Cardiac Model — Anterior View
SINUS
Layers
View
Anatomy: BodyParts3D/Anatomography, © DBCLS — CC BY-SA 2.1 Japan
Depolarization wavefront
RA · LA (atria)
RV · LV (ventricles)
RV · LV (ventricles)
press ▶ to step through a beat
Surface ECG — Live
II
1 mV
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Reference Complex
Lead II
EP Recording — Intracardiac + Surface
Drag on the recording to measure an interval (pauses the sweep automatically)
Short-coupled atrial extrastimuli (S2 ≤ 300 ms) induce AVNRT via an AH jump; ventricular S1-S2-S3 (S3 ≤ 250 ms) induce VT. His channel shows the A–H–V sequence; watch the HV interval.
Anti-Tachycardia Pacing (ATP)ICD therapy · Stim channel
Select Ventricular Tachycardia on the Monitor tab to enable ATP.
Burst: fixed cycle length. Ramp: cycle length decrements every pulse. Scan: repeats a short burst at progressively faster rates. Too gentle → failure; a therapeutic window → termination; too aggressive → risk of accelerating to VF — a real recognized hazard of ATP.
Pacemaker Lab — device timing · EGM · markers
AS / VS sensedAP / VP paced (× no capture)
AR / VR refractoryPVC / PMT
AV delayPVARP
VRPDrag a channel by its label to reorder
Mode
Dual-chamber: senses + paces both, tracks the atrium (As → Vp after the AV delay).
Programming
Capture threshold 1.0 V (intermittent within ±0.25 V). Signals: P 2.1–2.9 mV, AF 0.15–1 mV, far-field R 0.45 mV · R 10 mV, T 1.0–1.6 mV — a coarse setting undersenses, a fine one oversenses.
Patient
70 bpm
Conduction Pathways — Where's the Block?NORMAL CONDUCTION
Conducting now
Present, not used by this rhythm
Blocked
Heart Rate
--bpm
PR Interval
--ms
QRS Duration
--ms
QT / QTc
--ms
Regularity
--
Rhythm
Rate Control
Controls SA node discharge rate
Antiarrhythmic Pharmacology
No active agents
Pacemaker
Implanted device active — program it in the PM Lab tab.
bpm
bpm
ms
Last cycle —