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Viagra is Good for the Heart Viagra (Sildenafil citrate), which millions of men take for erectile dysfunction (ED), reduces the effects of hormonal stress on the heart by half, according to a study published online in the journal Circulation. Viagra causes genital blood vessels to expand, which helps in maintaining an erection. Recent research also has pointed to its potential usefulness in treating pulmonary hypertension. Prior to the latest findings by a team of Johns Hopkins researchers, it was thought to have little effect on the heart. Viagra, or sildenafil, blunts the strengthened heart beat caused by chemically induced stress, according to study senior author and cardiologist David Kass, MD, a professor at the Johns Hopkins University School of Medicine and its Heart Institute. It thereby lessens both the excess amount of blood and the force used to pump it to the body. "Sildenafil effectively puts a 'brake' on chemical stimulation of the heart," says Kass. Prevents and Reverses Effects of High BP These findings are believed to be the first confirmation in humans that Viagra has a direct effect on the heart. In earlier research, Kass and his team observed a similar effect in mice; Sildenafil blocked the short-term effects of hormonal stress in the heart. Related studies by the group show that sildenafil also prevents and reverses the long-term effects of chronic high blood pressure on the heart. Sildenafil reversed the negative effects on heart muscle weakened by heart failure and enlargement -- a condition called hypertrophy -- in mouse experiments Kass and his team carried out earlier this year. They reported their results in the journal Nature Medicine. "But we had no firm evidence as to whether or how this therapy might work in the human heart," says Kass. "Our latest research provides firm evidence this drug does indeed have an important impact on the heart." Increased Heartbeat Was Slowed Thirty-five healthy men and women, with an average age of 30 and no previous signs of coronary artery disease, participated in the six-month Johns Hopkins study. Within a three-hour timeframe, each participant received two separate injections of dobutamine (5 micrograms per kilogram for five minutes), a synthetic, adrenaline-like chemical that increases heart rate and pumping strength. Between injections, study participants were assigned randomly to a group that was treated with sildenafil (100 milligrams taken orally) or to a group given a sugar pill placebo. All participants then were given the second dobutamine injection to see what effects sildenafil or placebo had on the heart. Measurements of heart function were made before and after each injection. These included blood pressure readings, electrocardiograms and echocardiograms. Blood samples confirmed relatively equal levels of sildenafil and other enzymes. Read more. Online Pharmacy


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Viagra is Good for the Heart  

Viagra (Sildenafil citrate), which millions of men take for erectile dysfunction (ED), reduces the effects of hormonal stress on the heart b...

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