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Electrocardiography I
Drs.Drs.
J.G. De Lara Abad.J.G. De Lara Abad.
Manea Al ArashiManea Al Arashi
Al Azir Ayed.Al Azir Ayed.
The clinical electrocardiogram (ECG) records the
changing potentials of the electrical
fields imparted by the heart.
•Polarized state•Depolarization•Depolarized state•Repolarization
•Polarized state•Depolarization•Depolarized state•Repolarization
•Polarized state•Depolarization•Depolarized state•Repolarization
The normal heart beat is initiated by spontaneous firing of the sinus (SA) node in the right upper chamber of the heart (right atrium)
The activation wave passes through the muscles of both atria, activating them to contract
The electrical wave of activation reach the atrio- ventricular node
The activation rapidly descends the “Bundle of His”
The activation then spreads rapidly through the special conduction tissues of the ventricles
There follows a short period of relative inactivity recorded as the ST segment
Then the recovery wave spreads over the same pathway
“recharging the heart”
Sequence of ventricular activation of an isolated human heart
ECG Lead System
ECG Lead System
ECG Lead System
ECG Lead System
ECG Lead System
ECG Paper
ECG waves
ECG waves
ECG waves
ECG waves
ECG waves
ECG waves
ECG waves
ECG waves“ P “
ECG waves“QRS“
ECG waves“ T “
Report of ECG (1)
• Rhythm:
• Heart rates:
• Atrial
• Ventricular
• Axis Deviation
Report of ECG (2)
Measurements:
• PR:
• QRS:
• QT:
• QTc:
Report of ECG (3)
Description:
• I, II, III:
• aVR, aVL, aVF:
• V1 v2 :
Report of ECG (4)
Diagnosis:
According ECG, then with clinical findings.
Next classNext class
• Atrial enlargement• Ventricular hypertrophy