blockage of 70% is referred to as noncritical blockage. i suggest tablet ecosprin 75 mg (aspirin) every night so that the blockage will not progress in the future. tachycardia can be because of a large number of causes varying from anxiety stress anemia decreased coronary blood supply and defective electrical currents in the heart. tachycardia can be of two types. sinus tachycardia and arrhythmias. in sinus tachycardia heart rate increases but the rhythm of the heart remains normal. this can be corrected easily with the help of beta blocker. arrhythmias can cause disturbed rhythm of the heart and are to be taken very seriously. they can even be fatal. i would suggest you to go for an ecg 2d echo and holter test for getting evaluated. if you have an ecg then attach a copy so that i can see the basic rhythms of your heart. smoking and alcohol can also cause palpitations. but you have not mentioned them. for further information consult a cardiologist online --> <link>
would lad lesion cause tachycardia?