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Résumé ECG pour les débutants

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résumé très bien fait par un médecine résidente en cardiologie vous a mémoriser les notion de base de l'ECG

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January 11, 2026
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Dr : Hope
1. Le complexe QRS 4. Positions des dérivations précordiales

 Onde Q : première déflexion négative.  V1 : 4e EIC droit
 Onde R : déflexion positive.  V2 : 4e EIC gauche
 Onde S : déflexion négative après R.  V4 : 5e EIC ligne médio-claviculaire
 Onde R’ : deuxième onde positive.  V3 : entre V2 et V4
 Complexe QS : déflexion entièrement négative.  V5 : ligne axillaire antérieure
 V6 : ligne axillaire moyenne
2. La grille ECG
Régions correspondantes :
Axe Y (Amplitude)
 V1–V3 : ventricule droit / septum
 10 mm = 1 mV  V3–V4 : paroi antérieure
 V5–V6 : paroi latérale
Axe X (Temps)
5. Rapport R/S
 25 mm = 1 s
 5 mm = 0,2 s  R/S < 1 → prédominance VD
 1 mm = 0,04 s  R/S > 1 → prédominance VG
 Zone de transition : V3–V4
3. Ondes et intervalles
6. Morphologies anormales du QRS
Onde P
 Notching
 Durée normale < 0,10 s  Slurring
 P mitrale : onde large, double sommet (≥ 0,12 s)  Aspect en M
 RSR’
Intervalle PR
Bloc complet
 Normal : 0,12 – 0,20 s
 PR long → BAV 1er degré  BBG : encoche en V5–V6
 PR court → Syndrome de préexcitation (LGL, WPW)  BBD : encoche en V1–V2

QRS

 Normal ≤ 0,10 s
 0,10–0,12 s → bloc incomplet
 ≥ 0,12 s → bloc complet (BBG ou BBD)
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