外文心电图课件.ppt
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参见附件(1205kb)。
Electrocardiogram, ECG
Electrocardiogram (EKG or ECG)
* What is it?
An electrocardiogram - abbreviated as EKG or ECG - is a test that measures the electrical activity of the heartbeat. With each beat, an electrical impulse (or "wave") travels through the heart. This wave causes the muscle to squeeze and pump blood from the heart.
The Heart
* What is the function of ECG
* In an ECG test, the electrical impulses made while the heart is beating are recorded and usually shown on a piece of paper. This is known as an electrocardiogram, and records any problems with the heart's rhythm, and the conduction of the heart beat through the heart which may be affected by underlying heart disease.
Currents and Voltages
* At rest, Vm is constant
* No current flowing
* Inside of cell is at constant potential
* Outside of cell is at constant potential
Currents and Voltages
* During AP upstroke, Vm is NOT constant
* Current IS flowing
* Inside of cell is NOT at constant potential
* Outside of cell is NOT at constant potential
More Currents and Voltages
More Currents and Voltages
EKG
Electrocardiogram, ECG
Electrocardiogram (EKG or ECG)
* What is it?
An electrocardiogram - abbreviated as EKG or ECG - is a test that measures the electrical activity of the heartbeat. With each beat, an electrical impulse (or "wave") travels through the heart. This wave causes the muscle to squeeze and pump blood from the heart.
The Heart
* What is the function of ECG
* In an ECG test, the electrical impulses made while the heart is beating are recorded and usually shown on a piece of paper. This is known as an electrocardiogram, and records any problems with the heart's rhythm, and the conduction of the heart beat through the heart which may be affected by underlying heart disease.
Currents and Voltages
* At rest, Vm is constant
* No current flowing
* Inside of cell is at constant potential
* Outside of cell is at constant potential
Currents and Voltages
* During AP upstroke, Vm is NOT constant
* Current IS flowing
* Inside of cell is NOT at constant potential
* Outside of cell is NOT at constant potential
More Currents and Voltages
More Currents and Voltages
EKG
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