Can you tell me what it mean when it says short pr interval and a high lateral myocardial infarction?

Different things: Short pr interval means that the conduction through the heart is accelerated - often because it is arising lower in the atrium than usual or because there is an accessory bypass tract. High lateral mi means that there has been a heart attack in the high lateral wall, often due to disease in the left circumflex artery, marginal branch, or a diagonal branch of the left anterior descending.