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The blood composition in the corpus cavernosum by the following formula: A%=[Measured SO2–V (SO2)]/[A (SO2)−V (SO2)] V%=1−A%. VED therapy group: arterial blood accounts for 62%, and venous blood accounts for 38% in the corpus cavernosum. Traction group: arterial blood accounts for 27%, and venous blood accounts for 73% in the corpus cavernosum. Flaccid group: arterial blood accounts for 12%, and venous blood accounts for 88% in the corpus cavernosum. VED, vacuum erectile device.
