Guyton 2011 Chapter 11 Session 5 1 Electrocardiogram What is the ECG How the ECG was recorded What are the characteristics of ECG paper What are the waves intervals and segments of ECG ID: 917026
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Electrocardiogram (ECG)
Guyton 2011 Chapter 11
Session 5
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Slide2Electrocardiogram
What is the ECG?How the ECG was recorded?What are the characteristics of ECG paper?What are the waves, intervals and segments of ECG?What is lead? How many lead are usually recorded?
What is the Einthoven law?What is vector?What can we earn from ECG?
Objects
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Slide3Electrocardiogram
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Slide4Electrocardiogram
Atrial contraction
Begins
Complete
Ventricular contraction
Begins
Complete
Ventricular Relaxation
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Slide5Electrocardiogram
Recording of the ECG
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Slide6Recording of the ECG
Electrocardiogram
Depolarization
Begins
Complete
Repolarization
Begins
Complete
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Slide7Flow of Current Around the Heart During the Cardiac Cycle
Electrocardiogram7
Slide8Flow of Electrical Currents in the Chest Around the Heart
Electrocardiogram8
Slide9Electrocardiogram
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Slide10Electrocardiogram
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Slide11Time (s)
Voltage (mv)
Wave or complex and interval
0.1 - 0.3
P
1 - 1.5
QRS
0.2-0.3
T
0.16
PQ
(PR)
0.35
QT
Electrocardiogram
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Slide12Heart Rate Determination from ECG
Electrocardiogram
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Slide13Electrocardiographic Leads
ElectrocardiogramBipolar Limb Leads
Unipolar Limb Leads
Chest Leads (PrecordiaI Leads)
I
II
III
aVR
aVL
aVF
V1
V2
V3
V4
V5
V6
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Slide14Electrocardiographic Leads
aVF
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Slide15Electrocardiographic Leads
Standard Bipolar Limb Leads
Electrocardiogram15
Slide16Standard Bipolar Limb Leads
Electrocardiogram
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Slide17Einthoven's Law
I + III = IIElectrocardiogram
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Slide18Electrocardiogram
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Slide19Vectorial Analysis of Electrocardiograms
Electrocardiogram
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Slide20Unipolar Limb Leads
Electrocardiogram
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Slide21Vectorial Analysis of Electrocardiograms
Electrocardiogram
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Slide22Electrocardiographic Leads (
Horizontal plane)Electrocardiogram22
Slide23The anatomical orientation of the heart
The relative sizes of its chambersThe various disturbances of rhythmConduction, the extent and location of ischemic damage to the myocardium and its progressThe effects of altered electrolyte concentrationsThe influence of certain drugs (notably digitalis, antiarrhythmic agents, and Ca
++channel antagonists).Electrocardiogram
Findings from ECG
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Slide24The End
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