Clinical Note

The common heart attack occurs when a blood clot forms in a coronary artery, thus depriving a region of the heart muscle of its nutrition. This is accompanied by intense chest pain and a compromised ability of the heart to pump blood. To confirm that the pain is cardiac in origin, the physician will look for shifted ST segments in the ECG. ST segment changes become apparent after only a minute or two of interrupted blood flow.

An Accessory Pathway can Shorten the PR Interval

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