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Sildenafil (Viagra®) has two actions that may be of consequence in patients with heart disease. It can lower the blood pressure, and it can interact with nitrates. It should never be used in patients who are taking nitrates.
The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.
Blastomycosis is often misdiagnosed, resulting in tragic outcomes. It is caused by a fungus living in moist soil, in wooded areas of the United States and Canada. If inhaled, the fungus can cause mild breathing problems that may worsen and cause serious illness and even death.
There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
There are 60,000 miles of blood vessels in every adult human.