Mon, Apr 27 2009 NEW YORK (Reuters Health) - Two disorders that seem completely unrelated except that each is the focus of massive drug company ad campaigns may actually have something in common: Older men who suffer from restless legs syndrome at night are almost twice as likely to have erectile dysfunction as those without restless legs, researchers report. The study is published in the Nov. 11 online edition of Human Reproduction. Attention has recently been focused on the chemical mediators of erection. These include prostaglandin E, acetylcholine, vasoactive intestinal peptide and nitric oxide. The most physiologically important mediator is nitric oxide.2 This substance is released from nerve endings and vascular endothelium and functions by activating guanylate cyclase, which converts guanosine triphosphate to cyclic guanosine monophosphate (cGMP).3 cGMP becomes the secondary messenger that causes smooth muscle relaxation, resulting in venous engorgement and penile tumescence. medicaments to buy generic viagra online Cavernosography: Used in conjunction with the dynamic infusion cavernosometry, this test involves injecting a dye into the penis. The penis is then X-rayed so that the venous leak can be seen. online support pharmacy buy viagra online order viagra here buy viagra best price cialis buy cialis here you can buy viagra viagra online pharmacy
