Prepeared by dr manal moussa
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Electrocardiogram. Prepeared By Dr: Manal Moussa. Electrocardiogram Definition: ECG is a graphic record of the electrical currents that are generated by the heart. Purposes: The nurse performs a 12- lead ECG to: 1- Provide information about the electrical system of the heart.

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Prepeared By Dr: Manal Moussa

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Prepeared by dr manal moussa

Electrocardiogram

Prepeared By

Dr: Manal Moussa


Prepeared by dr manal moussa

Electrocardiogram

Definition:

ECG is a graphic record of the electrical currents that are generated by the heart.


Prepeared by dr manal moussa

Purposes:

The nurse performs a 12- lead ECG to:

1- Provide information about the electrical system

of the heart.

2- Record cardiac electrical activity for diagnostic

or documentary reasons.

3- Diagnose myocardial infarction.

4- Detect cardiac enlargement.

5- Differentiate between different types of

dysrrhythmias.

6- Determine the effects of administered drugs

and/or electrolytes on the heart's electrical

system.


Prepeared by dr manal moussa

Conductive system of the heart:

*The Sino Atrial node (S.A node) has the highest

rate of depolarization in the whole system. It starts

each heart beat (pace maker).

*From the S.A node, the impulse spreads to the

atria through Bachmann's Bundle to the left atrium.

*Stimulation of the atria produces the P wave on

the ECG. After that a brief delay at the

atrioventricular node (A.V node) to allow the atria

sufficient time to squeeze additional blood into the

ventricles.


Prepeared by dr manal moussa

  • *Then the impulse travels to the Bundles of His

  • down the left and right bundle branches and

  • terminates in the Purkinje fibers resulting in

  • contraction of the ventricles.

  • * The result of electrical stimulation of the

  • ventricles produces QRS complex on ECG.

  • *After that the relaxation of the cardiac muscle

  • occurs which represent T wave in ECG.


Prepeared by dr manal moussa

-Interpretation of ECG leads:

Bipolar limp leads:*

Lead I (LI): When the ECG is attached to the

right and left arms. It represents the difference in

electrical impulse between these two points.

Lead II (LII): When the ECG is attached to the

right arm and left leg. It represents the difference

in electrical impulse between these two points.

Lead III (LIII): When the ECG is attached to the

left arm and left leg. It representsthe difference in

electrical impulse between these two points.


Prepeared by dr manal moussa

aVR: Located in right arm.

Records the changes in electrical current

occurring in the part of heart which faces the right

shoulder.

aVL: Located in left arm.

Records the changes in electrical current occurring

in the part of heart which faces the left shoulder.

aVF: Located in left leg.

Records the changes in electrical current occurring

in the part of heart which faces the left leg.


Prepeared by dr manal moussa

Chest or precordial leads:

Chest leads:

V1-----fourth intercostals space (ICS) at right sternal border.

V2-----Fourth ICS at left sternal border.

V3-----Midway between V2 and V4.

V4-----Fifth ICS at midclavicular line.

V5-----Left anterior axillary line at level of V4.

V6-----Left midaxillary line at level of V4 horizontally.


Prepeared by dr manal moussa

Procedure:


Prepeared by dr manal moussa

V. Documentation:

Record in the patient's chart:

-Patient's name.

-Age.

-Diagnosis.

-Date.

-Time of procedure.


Prepeared by dr manal moussa

Rule of 300- Divide 300 by the number of boxes between each QRS = rate


Prepeared by dr manal moussa

THANK YOU


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