Dr PDR's Rhythm Simulator
12-lead · single-dipole projection · conduction & SVT teaching tool
🎓 Quiz mode
What is this rhythm?
rate & diagnosis hidden — students interpret
ladder
grid
intervals
⏸ Freeze
Set case ▾
Sinus
1° AVB
Mobitz I
Fixed M:N
3° / CHB
VPC
Flutter
AFib
AVNRT
AVRT
🎲 Random
👁 Reveal
✕ Exit
↻
Rotate your phone to
landscape
to see all 12 leads at full size.
try landscape
LEAD II
Sinus rhythm
−
100%
+
reset
⏸ Pause
⧉ Freeze
75
BPM · HR
PR
—
QRS
—
QT/QTc
—
RR
—
PP
—
Rhythm-specific
Wenckebach N
→ N : N−1 (one dropped per group)
PR increment
120
P waves (M)
Conducted (N)
M:N with constant PR — open-ended (e.g. 3:2, 6:1)
Escape rate
42
Flutter rate
300
AV conduction
2:1
4:1
3:1
variable
VPC pattern
Isolated
Couplets
Bigeminy
Trigeminy
Pause behavior
Full compensatory
Non-compensatory (resets SA)
Interpolated
Coupling
420
Episode
paroxysmal (PAC onset · manual offset)
Tachycardia
⚡ Induce
■ Terminate
Runs until you Terminate — it won't stop on its own.
Frontal axis
QRS axis
+50° Normal
Normal +60°
LAD −45°
RAD +120°
Extreme
Intervals & amplitudes
Rate
75
PR (ms)
160
P dur (ms)
100
QRS (ms)
90
QT (ms)
360 · QTc 402
P amp (mV)
0.15
R amp (mV)
1.2
T amp (mV)
0.3
View
Layout
12-lead
Rhythm (single lead II)
decompose (P · QRS-T · sum)
ladder
paper grid
fit 12-lead to screen
intervals below strip
⤓ 12-lead PNG
⤢ Landscape
Interpretation
—
—
P / atrial
QRS-T / ventricular
blocked / concealed