Pulmonary hypertension is caused by high blood pressure in the arteries that supply the lungs with blood. People who suffer from the condition can become tired, dizzy and short of breath, because the arteries feeding the lungs constrict and reduce the supply of oxygenated blood being circulating throughout the body. Erectile dysfunction. A vasodilator such as prostaglandin E1 can be injected into one of the corpora cavernosa. If the blood vessels are capable of dilating, a strong erection should develop within 5 minutes. A tourniquet may be used if a venous leak is present that would produce difficulty in maintaining an erection. online viagra without prescription buy viagra online looking for viagra ? canadian pharmacy viagra for sale online About 90% of the time, the cause of erectile dysfunction is physical. But erectile dysfunction can also be caused by psychological problems such as stress or performance anxiety. Men whose erectile dysfunction is mainly a psychological problem are able to get an adequate erection but not when they want to. Erections depend on healthy blood flow to the penis. During an erection, vessels in the penis become engorged with blood to produce an erection. Many diseases that affect the blood vessels can interfere with blood flow to the penis. Atherosclerosis (hardening of the arteries) and high blood pressure (hypertension) can cause abnormal blood flow to the penis and can affect a man's ability to have an erection.

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