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bpm
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RR ms
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QT ms
Speed
Gain
Heart Rate75 bpm
RR Interval800 ms
PR Interval160 ms
QRS Duration80 ms
QT / QTc400 / 461 ms
P-QRS-T Axes— / 45° / —
Speed / Gain25mm/s · 10mm/mV
Interpretation
ST Elevation
Reciprocal Depression
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—
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bpm
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RR ms
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PR ms
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QRS ms
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QT ms
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ST mV
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Axis
STEMI Evolution ~2h Hyperacute T waves
Zoom 100%
Ruler Click two points on the trace to measure
Electrical Axis
Left Panel
Normal Sinus Rhythm

SIDE-BY-SIDE COMPARISON

NORMALNormal Sinus Rhythm
LEFT
HR75 bpm
PR160 ms
QRS80 ms
QT400 ms
ST0.00 mV
DELTA
-
-
-
-
-
RIGHT
HR-
PR-
QRS-
QT-
ST-
Key Difference
Select pathologies to compare.
PATHOLOGY-
Lead: II
Left HR: -
PR: -
QRS: -
QT: -
ST: -
Right Panel
Select pathology...
1 small sq: 0.04s / 0.1mV
1 large sq: 0.2s / 0.5mV
Click any lead to expand
Space pause C cal E How to Read Esc back ← → lead/step A annot F full Tab tab

ECG CALIBRATION

Paper speed25 mm/s Gain10 mm/mV
1 small square1mm = 0.04s / 0.1mV 1 large square5mm = 0.2s / 0.5mV
Calibration pulse1mV · 200ms wide Current HR— Current RR—
HOW TO READ AN ECG
Systematic 7-Step Approach · USMLE Step 1 / Revalida

ECG Reference Diagram

DAILY ECG CHALLENGE

Attempts
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PERFORMANCE HISTORY
ECG QUIZ
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Total
Identify this ECG pattern
What is the most likely diagnosis based on this ECG?
QUIZ COMPLETE
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Questions