The boarderline 1st degree AV block isn't really a problem and could just be normal for you. It is the measurement of how long it takes electrical conduction to get from your atria to your ventricles (from the top of your heart to the bottom of your heart) - mostly has to the with the junction - the part that connects the atria with the ventricles. You can read more about it by going to http://www.emedicine.com/EMERG/topic233.htm. Sometimes poor blood flow to the junction can cause 1st degree AV block plus certain medicines slow conduction through the junction. Are you on any medicines?
Hard to say about the inverted T waves without knowing more information. T waves can be normally inverted in certain ECG leads and for certain people. Doesn't have to mean anything. Symmetrical T wave inversion can be a sign of poor blood flow to that part of the heart. Asymmetrical T waves can just be a sign that the ventricles repolarized funny. You can read more about it at http://library.med.utah.edu/kw/ecg/ecg_outline/Lesson11/index.html
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