Electrocardiograms Depolarization-cell's membrane becomes positive. Action potential generated. (Na+ and Ca+ into cell) Repolarization-cell's membrane.

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Electrocardiogram (ECG)

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Presentation transcript:

Electrocardiograms Depolarization-cell's membrane becomes positive. Action potential generated. (Na+ and Ca+ into cell) Repolarization-cell's membrane returns to negative. Resting membrane potential. (K+ out of cell)

Electrocardiograms Heart undergoes depolarization and repolarization- electrical currents generated spread throughout heart and body. Electrical activity generated by the heart measured by electrodes placed on the body. The recorded tracing is called an electrocardiogram (ECG, or EKG)

Reading an Electrocardiogram

Reading and Electrocardiogram P wave The P wave is a small deflection wave that represents atrial depolarization. QRS wave complex The three waves of the QRS complex represent ventricular depolarization. T wave T waves represent ventricular repolarization

Reading an Electrocardiogram

Tachycardia Heart rate is rapid (over 100 bpm)

Bradycardia Heart rate is slower (less than 60 bpm)

Radiographs Use electromagnetic radiation to see inside the body conditions of lungs heart-related lung problems fluid in the lungs size and outline of heart problems with blood vessels calcium deposits fractures pacemaker, defibrillator, catheters