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Hyperactive Penile Retaction Reflex (HPRR)

The flaccid penis undergoes retraction upon contraction of the muscles in and around the penis. The retraction of the penis (“turtle in the shell effect”) is most pronounced in situations of cold, stress, and upon exercising. Shinkage, also known as Hyperactive Penile Retraction Reflex, can be the source of anxiety and embarrassment, especially when exposed to their partners or others in showers and dressing rooms. These patients often have a normal and satisfactory length in the erect state.

These patients are the ideal candidates for the MagnYm™ (neuromodulation) treatment.


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