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Basic Electrocardiogram (EKG), นศพต.เขม พรมมา 07 6439907992 - Coggle…
Basic Electrocardiogram (EKG)
Electrical conduction pathway
SA node
Atria
AV node
Bundle of His 1
Right and left bundle branches
Purkinje fibers
Ventricle
Electrocardiogram (EKG)
A record of electrical activity of
the heart using surface electrode
Cardiac action potential
Fast action potential
Slow action potential
Sinus rhythm
Positive P wave in II
Negative P wave in aVR
Originated from SA node
Normal sinus rate 60-100 bpm
Normal rhythm of heart
QRS axis between -30° - 90°
Segment
ST segment Normal ST segment should be isoelectric Maybe slightly deviated (< 1 mm) Marked elevation or depression of ST segment should be ruled out myocardial infarction
QRS axis
The direction on the mean electrical vector Normal axis (-30o - 90o) Left axis deviation Right axis deviation Extreme axis deviation
Electrical conduction pathway
Electrode position in 12-lead system
4 electrodes at limbs
Right arm
Left leg
Left arm
Right leg
6 electrodes at chest wall
4th ICS and RPSB
4th ICS and LPSB
Between lead V2 and V4
5th ICS and MCL
5th ICS and AAL
5th ICS and MAL
12-leads EKG
Unipolar leads
Augmented limb leads
Precordial/chest leads
Bipolar leads
Standard limb leads
EKG leads
Bipolar leads
Lead I, II, III
Unipolar leads
Lead aVR, aVL, aVF
Precordial/chest leads
Surface electrode
EKG waveform
นศพต.เขม พรมมา 07 6439907992