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In a new study that will be published in the July 17th issue of the journal Circulation, Canadian researchers reveal that the erectile dysfunction drug Viagra (Sildenafil), may likely be effective in the treatment of patients with right-sided heart failure, principally because their study shows that only the hearts of these patients exhibit the target molecules that can be blocked by these types of drugs.
The study was led by Drs. Jayan Nagendran, a cardiac surgery resident and Evangelos Michelakis, professor in the Department of Surgery and the Department of Pharmacology at the University of Alberta in Canada.
The researchers wanted to gain insight into the mechanism of how Viagra may benefit patients with pulmonary hypertension (high blood pressure in the lung vessels). This devastating condition usually leads to right-sided (right ventricle) heart failure.
In their study, the researchers evaluated heart specimens from 9 patients to assess their phosphodiesterase type-5 (PDE-5) activity and their response to specific type-5 PDE inhibitors such as Viagra.
PDE-5 is an enzyme that degrades the activity of cGMP, a chemical that relaxes smooth muscle cells. In the vasculature, relaxation of smooth muscle cells causes vessels to dilate thereby increasing blood flow.
PDE-5 is preponderant in the corpus cavernosum of the penis. When it's inhibited, it leads to higher cGMP levels and less dilation (more constriction) of the blood vessels that let blood escape from the corpus cavernosum and thereby leading to a sustained erection.
The researchers essentially found that PDE-5 was not expressed in heart samples from patients that were healthy. Conversely, they did discover that patients with enlarged right heart ventricles had marked increased PDE-5 activity.
When the research team used Viagra (the PDE-5 inhibitor) in their experiments, they found that it increased the activity of isolated cardiac cells and the strength of heart contractions only in unhealthy samples and patients and not in any of the healthy controls.
In the press release from the University of Alberta, Dr. Nagendran stated that “there are a number of medical conditions in both children and adults for which there is a need to boost the performance of the right ventricle, and this drug can be clinically and immediately relevant to help these patients”
Dr. Michelakis also added that “We have a number of drugs and therapies available to treat the left ventricle of the heart to prevent it from failing or to treat it after it has failed, bet we don't have anything for the right ventricle. The phosphodiesterase type-5 inhibtors, which include Viagra, Cialis, and Levitra, may offer some important benefits in this case.”
Viagra (Sildenafil) has been recently approved in the treatment of pulmonary hypertension.
Sources:
Medline/PubMed:
http://www.ncbi.nlm.nih.gov/sites/entrez?Db=pubmed&Cmd=ShowDetailView&TermToSearch=17606845&ordinalpos=2&itool=EntrezSystem2.PEntrez.Pubmed.Pubmed_ResultsPanel.Pubmed_RVDocSum
University of Alberta Express News: http://www.expressnews.ualberta.ca/article.cfm?id=8591
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Upon further reflection on the comforting assertion that:
“23. Stayart has never engaged in a promiscuous lifestyle or other overt sexual activities.”
This makes complete sense really.
That is why there is -NO SUCH THING- as the Bev Stayart Angry Dragon, the Bev Stayart Arabian Goggles, the Bev Stayart Bait N' Tackle, the Bev Stayart Bear Claw, the Bev Stayart Beef Curtain, the Bev Stayart Blumpy, the Bev Stayart Bronco, the Bev Stayart Brown Bagging It, the Bev Stayart Brown Necktie, the Bev Stayart Brunski, the Bev Stayart Bullwinkle, the Bev Stayart Butter Face, the Bev Stayart Canine Special, the Bev Stayart Carpet Cleaner, the Bev Stayart Chili Dog, the Bev Stayart Chocolate Pizza, the Bev Stayart Cleveland Steamer, the Bev Stayart Cold Lunch, the Bev Stayart Concoction, the Bev Stayart Cop's Delight, the Bev Stayart Corkscrew, the Bev Stayart Daisy Chain, the Bev Stayart Davey Crockett, the Bev Stayart Dirty Sanchez, the Bev Stayart Dirty Swirly, the Bev Stayart Dog In A Bathtub, the Bev Stayart Donkey Punch, the Bev Stayart DVDA, the Bev Stayart Electric Chair or the Bev Stayart Fish Eye.
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Because if overt sexual activities like these did in fact exist, I'm sure a Google, Yahoo or perhaps even a Bing search would find references to such abominations.
Whew! I'm sure glad that'll never happen. I would be very, very dissapointed in Bev.
Wouldn't you?
.
(reply to this comment) (link to this comment)