Explain me 10 common heart diseases with ECG changes and ECG images of those diseases
- Current of injury diagram (Harrison's) - shows mechanistically why STEMI causes ST elevation vs depression
- Wellens T-wave sign (Harrison's) - deep anterior T inversions indicating LAD disease
- Atrial fibrillation (Guyton & Hall + Tintinalli's) - absent P waves with irregular RR intervals
- First-degree heart block (Ganong's) - prolonged PR = 0.38 s
- Second-degree Wenckebach block (Ganong's) - progressive PR lengthening then dropped beat
- Complete heart block (Ganong's) - fully independent P and QRS rhythms
- WPW syndrome (Tintinalli's) - full 12-lead with delta wave and pathway diagram
- 12-lead AF ECG (Tintinalli's)
- LBBB can completely mask a STEMI - always apply Sgarbossa criteria
- A regular narrow tachycardia at exactly 150 bpm = atrial flutter with 2:1 block until proven otherwise
- WPW + AF is life-threatening - never give AV nodal blockers (adenosine, verapamil, diltiazem)
- QTc ≥ 500 ms = high risk for torsades de pointes - check and correct all offending drugs and electrolytes
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