Note that the first three account for almost 90% of ECG tracings with LAD. If the QRS is predominantly negative in lead I and positive in lead aVF, then the axis is rightward (right axis deviation).

See the ECG basics section on determining axis for details. If the QRS is upright in lead I and downward (negative) in lead aVF, then the axis is between 0 and -90 degrees, likely left axis deviation.

There are only a few studies regarding epidemiology of exertional heat stroke among different sports and it occurs at a rate of 1.20 per 100,000 ... (ECG) revealed sinus tachycardia with ST depression ...