Explore inside the heart
° · negative = RAO
45° RAO / 60° LAO are adjustable teaching presets, not required acquisition angles. This perspective view is not calibrated fluoroscopy.
Your ECG differential on the heart
Enter lead findings to place compatible regions.
ECG leads & viewing directionsSelect one or more leads to compare their directions
Show lead directions Approximate regionGold = illustrative frontal projection
Choose “All 12 leads” to compare their viewing directions around the heart.
Intact heart · same viewGold arrow: illustrative mean direction
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Patient RPatient L
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Section view
Advanced: free cut-through
A freely placed section can intersect several structures. Filled cut surfaces are display caps, not reconstructed tissue layers, wall thickness or histology. Use guided anatomy to learn the landmarks.
Right heartLeft heartValves / septumTeaching colors
The RV forms most of the anterior surface. The pulmonary trunk lies anterior to the aortic root.
ECG → REASONING → REGIONS
Where could this PVC come from?
Enter what you see in the PVC beat. Each finding narrows a teaching differential; unknown findings stay open.
Try an example
More examples · discordant leads
Read the ECG in this order
TEACHING DIFFERENTIAL
0 findingsStart with II and III
Why these lead findings point here
Compare the most consistent patterns, then examine the features that distinguish the alternatives.
Based on Enriquez et al., 2019 and Muser et al., 2021.