RhythmDockNormal Sinus Rhythm
A regular rhythm originating in the sinus node.
Explore rhythm →RHYTHM LIBRARY
Learn the identifying features.
Start with rate and regularity, then examine P waves, PR intervals and QRS width. These are simplified Lead II teaching examples.
Beyond rhythm names: STEMI, hyperkalemia and torsades →
Sinus Bradycardia
Sinus rhythm with a rate below 60 beats per minute.
Explore rhythm →Sinus Tachycardia
Sinus rhythm at an increased rate.
Explore rhythm →Atrial Fibrillation
Disorganized atrial activity produces irregular ventricular timing.
Explore rhythm →Atrial Flutter
Organized rapid atrial activity. This example uses a 300 bpm atrial rate and fixed conduction.
Explore rhythm →Supraventricular Tachycardia
A simplified regular, narrow-complex SVT pattern. SVT is a broad rhythm category.
Explore rhythm →Sinus Rhythm with PVCs
Premature ventricular beats interrupt an underlying sinus rhythm.
Explore rhythm →Ventricular Tachycardia
A simplified monomorphic ventricular tachycardia pattern.
Explore rhythm →Ventricular Fibrillation
Disorganized ventricular electrical activity without coordinated complexes.
Explore rhythm →Asystole
An isoelectric educational example without discernible ventricular activity.
Explore rhythm →First-Degree AV Block
Every atrial impulse conducts, with a prolonged PR interval.
Explore rhythm →Second-Degree AV Block · Mobitz I
PR intervals lengthen before a nonconducted P wave; the cycle then restarts.
Explore rhythm →Second-Degree AV Block · Mobitz II
Atrial impulses intermittently fail to conduct without progressive PR lengthening.
Explore rhythm →Third-Degree AV Block
Atrial and ventricular activity proceed independently (AV dissociation).
Explore rhythm →Junctional Rhythm
An escape rhythm arising near the AV junction. This example shows small inverted P waves.
Explore rhythm →Sinus Arrhythmia
Sinus beats show a gradual cyclical change in R–R intervals.
Explore rhythm →Torsades de Pointes · Teaching Pattern
A simplified twisting polymorphic VT run. Torsades requires a prolonged QT in the preceding rhythm; that preceding QT is not shown here. This pattern alone cannot establish the diagnosis.
Explore rhythm →