Ju

Lead l

^^ Ischemic zone

^^ Ischemic zone

FIGURE 8 A heart with an ischemic region on its inferior surface. The injured region causes a current of injury that shifts the ST segment above the baseline. The location of the injured region can be determined by vector analysis of the ECG traces.

FIGURE 8 A heart with an ischemic region on its inferior surface. The injured region causes a current of injury that shifts the ST segment above the baseline. The location of the injured region can be determined by vector analysis of the ECG traces.

is below the ST segment. This means that the current of injury caused the lower half of the body to be negative between beats. Because the injured region is negatively charged during diastole, that region must be on the inferior surface of the heart. Note that no ST segment shift is seen in lead I, which is at right angles to the current of injury's dipole.

THE ELECTROCARDIOGRAM CAN DETECT CHANGES IN THE HEART'S RHYTHM

In the first part of this chapter we discussed factors that affect the electrical vectors generated by the heart and how they can be detected by an ECG. In the remainder of the chapter, we will discuss factors that affect the timing of events in the heart, the arrhythmias.

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Get Rid of Gallstones Naturally

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