distoproximal latency ratio (DPLR) studies

The calculation of the distoproximal ratio allows comparison of a sensory nerve action velocity (SNCV) in the distal median nerve segment (SNCV digit III – wrist) with that of the proximal segment (SNCV palm – wrist) of the same nerve. The distoproximal ratio is calculated comparing digit-palm and palm-wrist sensory nerve conduction velocities (SNCV) as follows:

Distoproximal ratio = digit-palm (m/s) / palm-wrist (m/s)

In normal hands, the SNCV in the proximal segment (palm – wrist) was higher than the SNCV of the distal segment (digit – palm), and it is always <1.0. This ratio is reversed (>1) in a patient with carpal tunnel syndrome (CTS).

S40 (Padua et al., 1996) BUY CHAPTER
S40 (Padua et al., 1996) BUY CHAPTER
S50 (Pyun et al., 2005)
S50 (Pyun et al., 2005) BUY CHAPTER
S55 (Kasius et al., 2012) BUY CHAPTER
S55 (Kasius et al., 2012) BUY CHAPTER