Short ECG teaching videos I make with code — one idea per video, most about a minute long, vertical format. Narration and on-screen captions are in Mandarin Chinese. Grouped by series, each with a one-line takeaway and its sources.
The 20 findings of the OMI Atlas, one short video per finding.
Upright T wave, but the U wave after it points down: in a chest pain patient, treat it as an ischemia warning sign
indicative of posterior OMI
Precordial STD deepest in V1–V4 should make you highly suspect posterior OMI (specificity 97%)
Terminal QRS distortion
V2 or V3: no S wave and no J wave. When the tail is gone, that's the warning sign
The chest pain has stopped, but the T wave is still warning you
One lead looks like VT, check the other leads first
When one lead looks like VT, check the other leads first; sometimes massive STE gets mistaken for a wide QRS
Where the ECG waves come from, and why the ST rises.
pre-excited atrial fibrillation
Wide, fast, and irregular: always think Af + WPW first, and give none of A, B, C, D (adenosine/amiodarone, β-blocker, CCB, digoxin)
RAD + rightward leads STE
When you see ST elevation in V1, V2, and aVR plus RAD, you must keep three DDx in mind: Hyper-K, PE, Na channel blocker; don't think AMI first
VT or SVT with aberrancy?
Regular wide QRS, treat it as VT first: about 80% really are VT; treating SVT as VT is usually fine, treating VT as SVT (giving verapamil or diltiazem) may kill the patient
The ECG of TCA and other drug poisonings
Treat a wide QRS as VT first; but a drug ingestion plus SALT (Shock, Altered mental status, Long QRS, Terminal R in aVR) means think Na channel blocker first, give NaHCO3 first, and don't give amiodarone or procainamide
All four episodes' key points in one go
Wide, fast, and irregular → think Af + WPW first, give none of A, B, C, D; one lead looks like VT, check the other leads first (massive STE); regular wide QRS, treat it as VT first; drug overdose plus SALT, think Na channel blocker first
Don't get sucked in by the eye-catching ventricular rhythm
Don't rush to shock a wide QRS: look at the rate first, then the patient; a slow wide QRS after STEMI may be AIVR (reperfusion rhythm), don't shock it as VT
Narrow and fast QRS, look at the P waves first: one differential key point per episode.
All three episodes' key points in one go
Narrow and fast QRS: first look at V1 for P waves and how many; heart rate 150±20, think flutter 2:1 first and look for another P inside the QRS; for treatment, check stability first: unstable, synchronized cardioversion; stable, vagal first, then adenosine
Narrow-QRS trilogy 01/03
Narrow and fast QRS, think of three conditions first: sinus tachycardia, flutter 2:1, PSVT; first look at V1 for P waves and how many