Polyneuropathy is disease causing dysfunction of peripheral nerve axons, their myelin sheath, or both.
Polyneuropathy is a disorder in which nerve conduction studies and eletromyographic findings can be of great value in confirming the diagnosis, identifying the segments of diseased nerve and determining prognosis.
This study was performed in 60 patients with idiopathic polyneuritis (male;43, female;27) ranging in age from 3-65 years.
Motor conduction velocities and distal latencies had been studied in peroneal, tibial, median and ulnar nerves, and sensroy conduction velocities and distal latencies had been studies in peroneal, tibial, median, ulnar and radial nerves. Electromyographic study was performed on the muscles of upper and lower extremities and H reflex examination was performed at gastrocnemius muscles.
The results obtained were summarized as follows:
1. Delayed velocity, diminished amplitude, no conduction or prolonged latency of evoked action potentials in motor nerve conduction study were observed in 97-14%, of peroneal, 91.51% of tibial, 74.44% of median and 81.11% of ulnar nerve. The order of involved nerves were tibial, peroneal, median and ulnar nerve. The largest proportion of abnormality was combination of delayed velocity, diminished amplitude and prolonged latency (25. 07961).
2. Delayed velocity, no conduction or prolonged latency in sensory nerve conduction studies were observed in 79.61% of peroneal, 98.88% of tibial, 56.9061 of median, 64.77% of ulnar and 56.25% of radial nerve.
The order of involved nerves were tibial, peroneal, ulnar, median and radial nerve. The largest proportion of abnormality was no conduction (55-59%).
3. 1) The mean values of motor conduction velocity of 60 Polyneuropathy patients were: In
all samples included: 43.988.92m/sec of peroneal, 40.238.72m/sec of tibial,
53.7214.55m/sec of median and 54.7515.47m/sec of ulnar nerve, Only in abnormal samples : 37.90=5. 15m/sec of peroneal, 37.475.60m/sec of tibial,
43. 108.92m/sec of median, 43. 118.73m/sec of ulnar nerve.
2) The mean values of distal latency of motor action potential in 60 polyneuropathy patients were:
In all samples included : 5.96 +- 3.04msec of peroneal, 6.38 2.47msec of tibial,
3.331.6msec of median and 3.07+1.7msec of ulnar nerve. Only in abnormal samples : 7.053.09msec of peroneal, 7.902. 13msec of tibial,
4. 971.82msec of median and 4.521.77msec of ulnar nerve.
4. 1) The mean values of sensory conduction velocity of 60 polyneuropathy patients were: In all samples included : 46.64 14.62m/sec of peroneal, 39.96 12.22m/sec of tibial,
57.82 --12. 5m/sec of median, 61. 17 t 12.03m/sec of ulnar and
57.73 - 12.56m/sec of radial nerve.
Only in abnormal samples : 32.203.74m/sec of peroneal, 31.523.96m/sec of tibial, 46.77.44m/sec of median, 46.78i-4.4m/sec of ulnar and 43.667.9m/sec of radial nerve.
2) The mean values of distal latency of sensory action potential in 60 polyneuropathy patients were:
In all samples included : 4.392. 92msec of peroneal, 9.63-r2.5msec of tibial, 3.220.95msec of median, 3.431.64msec of ulnar and 2.63 0.62msec of radial nerve.
Only in abnormal samples : 7. 553. 15msec of peroneal, 9.622.53msec of tibial, 4. 29 0. 82msec of median, 5. 26 1. 84msec of ulnar and 4.23-}0.61msec of radial nerve.
5. On eletromyographic examination, fibrillation potentials and positive sharp waves at rest were found in 47 cases (78.33%) . On volitional efforts, increased polyphasic potentials (37 cases, 61.67%) and decreased numbers of motor units or no motor unit (45 cases, 75%) were observed.
6. Nerve conduction study and EMG findings according to time from onset to study: Delayed velocity, diminished amplitude, prolonged distal latency of action potentials in nerve conduction study & fibrillation potentials and positive sharp waves at rest, increased polypliasic potentials and decreased numbers of motor units or no motor units on volitional effort in EMG could already be observed within 15 days. The earliest findings were diminished amplitude in motor conduction study & no conduction in sensory conduction study. In 2 years, abnormal EMG indings could be observed in all cases.
7. H reflex examination was performed in 23 cases.
18 cases (78.26%) showed no response or delay in latency.
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