P-ANCA vasculitic neuropathy with 12-year latency between onset of neuropathy and systemic symptoms

BMC Neurology

Table 1 Initial Electrodiagnostic studies in February 1994

Sensory
Nerve	Amplitude (μV)		Velocity (m/sec)
	R	L	R	L
Median-D2	22	12	59	47
Ulnar-D5	16	13	55	55
Dorsal ulnar	9	13	60	57
Radial	23	31	63	71
Sural	17	18	55	46
Motor
Nerve	Amplitudes (mV) ^¶	Distal motor latency, velocities (msec, m/sec) ^§		F-wave minimum latency (msec) ^¥
R Median-APB	7.9/7.3/7.6	3.6/50/65		Absent
L Median-APB	11.0/10.6	4.0/53		27.1
R Ulnar-ADM	2.5/2.5/2.1/2.1	3.3/51/56/50		Absent
L Ulnar-ADM	7.3/6.7/5.4	3.3/61/42		29.4
R Peroneal-EDB	5.4/5.8/5.7	4.9/44/60		52.2
L Peroneal-EDB	3.5/3.1/2.9	5.2/46/45		Absent
R Tibial-AH	14.4/11.2	3.7/42		55
L Tibial-AH	11.7/9.9	4.8/51		55

^¶ Amplitudes from sites as follows: median – wrist at 7 cm, elbow, axilla; ulnar – wrist at 7 cm, below elbow, above elbow, axilla; peroneal – ankle at 9 cm, below fibular head, above fibular head; tibial – ankle at 9 cm, popliteal fossa. ^§ The first value is the distal motor latency and subsequent values segmental velocities. ^¥ F-wave persistence and chronodispersion not recorded in the medical records

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