The document is about an electrocardiogram (ECG or EKG), which is a diagnostic tool that measures the electrical activity and muscle functions of the heart. It can assess heart rate, rhythm, and provide indirect evidence of blood flow to the heart muscle. Each wave and segment of an ECG represents a different event in the cardiac cycle, including the P wave for atrial depolarization, the QRS complex for ventricular depolarization, and the T wave for ventricular repolarization. The document then proceeds to define each individual wave and segment of the ECG in more detail.

1. ECG
(Electrocardiogram)

2. Presented By
Syed Nazmus Sakib
Dept. of Applied Physics, Electronics & Communication Engineering
University of Chittagong
3rd Year, 6th Semester
ID: 13702008
Session: 2012-2013

3. CONTENTS
S - Wave
S-T Segment
T - Wave
Q - Wave
R - Wave
P-Q Segment
P - Wave
ECG Wave
What is ECG?

4. What is ECG?
The Electrocardiogram (ECG or
EKG) is a diagnostic tool that is
routinely used to assess the
electrical and muscular functions of
the heart.
The electrocardiogram can measure
the rate and rhythm of the heartbeat,
as well as provide indirect evidence
of blood flow to the heart muscle.
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5. ECG Wave
Each wave or segment of an ECG
represents a certain event in the
Cardiac Cycle.
The segments are:
• P wave
• P-Q segment
• QRS complex
• S-T segment
• T-wave
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6. P - Wave
When the Atria is full of blood
the SA node (Sinoatrial Node)
fires and electrical impulses
spread throughout the Atria and
cause them to depolarize.
This is represented by the P-wave
on the ECG.
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7. P-Q Segment
The P-Q segment represents the time required for the signal to travel
from SA node (Sinoatrial node) to AV node (Atrioventricular node).
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8. Q - Wave
Q-wave corresponds to the depolarization of the inter ventricular
section.
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9. R - Wave
R-wave is produced by depolarization of the main mass of the
ventricles.
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10. S - Wave?
S-wave represents the last phase of the ventricular depolarization at
the base of the heart.
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11. S-T Segment
When the ventricles contract & pump blood, we have the S-T segment
on the ECG wave.
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12. T - Wave
The T-wave represents the ventricular repolarization immediately
before ventricular relaxation
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13. Thus the cycle repeats itself with every heartbeat.
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14. End of Presentation