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This page offers definitions and phrases of various Erectile Dysfunction related terms.
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Radial rigidity -  Rigidity across the width or radius of the penis.
Radiation therapy -  Administration of radiation to treat a disease.
Radical prostatectomy -  A surgical procedure for prostate cancer in which the entire prostate and seminal vesicles, and part of the vas deferens, are removed.
Randomized -  The process of assigning patients to different forms of treatment in a research study in a random manner.
Red blood cells -  The cells in the blood that carry oxygen to the tissues.
REM (rapid eye movement) -  A phase in the sleep cycle. Nocturnal erections occur during this phase of sleep.
Resistance -  Opposition to blood flow out of the penis.
Retrograde ejaculation -  A condition whereby the ejaculate passes backward into the bladder instead of forward out the tip of the penis; frequently occurs after TURP.
Retroperitoneal lymph node dissection -  A procedure to remove lymph nodes adjacent to the site of testicular or prostate cancer.