Tell me basic to clinics about ECG and interpretation.

Reading File

Finding Sources

Reading File

Finding Sources

Reading File

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Finding Sources

Reading File

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Reading File

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That covers ECG from the ground up. Here is a quick orientation to what was covered and where to go next:

What this guide covered:

Section	Key Takeaway
Conduction system	SA node → AV node → His bundle → Bundle branches → Purkinje fibers. Each step maps to a waveform.
ECG paper	Small box = 0.04 s / 0.1 mV; large box = 0.20 s / 0.5 mV
Waveforms	P = atrial depolarization; QRS = ventricular depolarization; T = ventricular repolarization; U = afterpotentials
Normal intervals	PR 120-200 ms; QRS < 120 ms; QTc < 440/460 ms
Axis	Normal -30° to +90/100°. Use Lead I + aVF as the quick screen.
14-step approach	Harrison's gold-standard systematic method - never skip steps to avoid errors of omission
LVH/RVH	Voltage criteria + repolarization "strain" patterns
Bundle blocks	RBBB = RSR' in V1; LBBB = broad R in laterals, masks ischemia
AV blocks	1st (long PR) → Wenckebach (PR lengthening) → Mobitz II (sudden drop) → 3rd (complete dissociation)
Ischemia/MI	STEMI = ST elevation in culprit territory + reciprocal depression; localize by lead group
Arrhythmias	AF (irregular, no P), flutter (sawtooth), VT (wide complex, AV dissociation), WPW (delta wave)
Electrolytes/drugs	Hyperkalemia (peaked T → wide QRS), hypokalemia (U waves), digitalis (scooped ST), Brugada pattern

If you want me to go deeper on any one topic - such as a full arrhythmia classification, Sgarbossa criteria for STEMI in LBBB, long QT drug lists, or pediatric ECG differences - just ask.

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