Formal neurological testing is not needed in the vast majority of patients with ED. Those with a history of CNS problems, peripheral neuropathy, diabetes, or penile sensory deficit would probably benefit from some level of neurological testing. The sensitivity of the skin of the penis to detect vibrational stimuli, ie, biothesiometry, can be used as a simple nerve function office screening test. This involves the use of a small electromagnetic test probe placed on the right and left sides of the shaft and on the glans. The vibrational amplitude is adjusted until the subjective sensory threshold is reached, which is determined by questioning the patient. A series of these tests determines the average vibrational sensory threshold in each location, which are then compared to reference range standards for the patient's age group. Although this test does not directly measure the erectile nerves, it serves as a reasonable screening for possible sensory deficit and is simple to perform. Formal nerve conduction studies, such as bulbocavernosus reflex latency time, are reserved for very select situations. best price viagra viagra online without prescription canadian pharmacy online canadian viagra online And now a growing body of research ties erectile dysfunction to vascular diseases, such as coronary artery disease. medicaments to buy buy viagra online click to enter pharmacy buy cialis Current Article Ratings: In the first study of its kind, New England Research Institutes, Inc. (NERI) in collaboration with the Division of Cardiology, San Francisco General Hospital and the University of California, San Francisco tested whether erectile dysfunction (ED) can be used to reclassify patients according to their future risk of developing cardiovascular disease (CVD) beyond traditional risk factors (such as smoking, high blood pressure, high cholesterol, etc). Results of the 12-year research study are published in the January 26, 2010 issue of the Journal of the American College of Cardiology and show that ED may be a warning sign of a future cardiovascular event like heart attack, stroke, atherosclerosis, coronary artery bypass graft surgery, and congestive heart failure. However, while ED is significantly related to CVD independent of traditional risk factors, it does not improve the prediction of who will and will not develop CVD beyond these risk factors.