Hello, Thank you for using healthcare magic. I understand your concern. In your case, left axis deviation si caused by left ventricular hypertophy (cardiac muscle hypertophy) due to hypertension. So, this is a normal finding in persons suffering from high blood pressure, expecially if there is a long time hypertension history. You do not need any further investiation. All you need to do, is to get your blood pressure under control. Try to check it frequently, to take the prescibed medicines regularly, to avoid high salt food intake and to have a moderate periodic physical activity. Hope this may be helpful for you. Please feel free to contact me if you need any further explanation. Dr. Juarda