Hi, Thanks for writing in. PSV is peak systolic velocity and for you it is in the range of 47 to 50 cm/ second which is normal. EDV is end diastolic velocity and it is 1 to 2 cm/ second is a dynamic variable. EDV in a normal penile Doppler decreases with increase in erection and at full erection a negative value is obtained due to flow reversal. This has not been commented up on in the report so I assume the erection might not have been total. There are many reasons for less than total erection including addiction, smoking and medical conditions.