Wednesday, August 25, 2010

Nocturnal Penile Tumuscence Rigidity Test: Relevence in Erectile Dysfunction

Nocturnal Penile Tumuscence Rigidity Test:
In its classic form, NPT consists of nocturnal monitoring devices that measure the number of episodes, tumescence , maximal penile rigidity, and duration of nocturnal erections. In 1985, the RigiScan was introduced; it was the first device to provide automated, portable NPTR recording. The device combines the monitoring of radial rigidity, tumescence, number, and duration of erectile events with the convenience of a portable system that can be used at home. It consists of a recording unit that can collect data for three separate nights for a maximum of 10 hours each night (As shown in above Figure). The mechanics consist of two loops: one is placed at the base of the penis and the other at the coronal sulcus. By constricting the loops, the device records penile tumescence (circumference) and radial rigidity at the penile base and tip. Radial rigidity above 70% represents a nonbuckling erection, and a rigidity of less than 40% represents a flaccid penis. The number of erections considered normal is three to six per 8-hour session, lasting an average of 10 to 15 minutes each. The normal NPTR criteria are: four to five erectile episodes per night; mean duration longer than 30 minutes; an increase in circumference of more than 3 cm at the base and more than 2 cm at the tip; and maximal rigidity above 70% at both base and tip.
The documented presence of a full erection indicates that the neurovascular axis is functionally intact and that the cause of the ED is most likely psychogenic.

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