Plastic and reconstructive surgery 01/2013; 131(1):132e-3e. · 2.74 Impact Factor
ABSTRACT: To investigate the impact of loss of sympathetic innervation on peripheral nerve regeneration.
Thirty-two SD rats underwent resection of the right middle cervical ganglion and excision and re-anastomosis of bilateral medium nerve, and then were randomly divided into 4 equal groups to undergo the following experiments. One, 2, 3, and 4 weeks later the sensory nerve action potentials (SNAPs) of bilateral medium nerves 5 mm from the anastomotic stoma and the compound muscle action potentials (CMAPs) of bilateral superficial digital flexor muscles were measured with stimulating and recording electrodes. Specimens of the distal part of bilateral medium nerves 5 mm from the anastomotic stoma were collected to calculate the number of modulated fibers by electron microscopy. The tendons of bilateral superior digital flexor muscles were cut ant the wrist, isolated to the terminal points, ligated, and connected to a sensor so as to record the maximum contraction power. The superior digital flexor muscle was completely resected to be weighted.
CMAP failed to be recorded 1 week later. The wave amplitude of the nerve at the affected side increased along with time, however, the CMAP wave amplitudes of the affected side were all significantly lower than those of the healthy side (all P < 0.05). The SNAP wave amplitudes of the medium nerve of both sides increased along with the time. The SNAP levels 4 and 8 weeks later of the affected side were both lower than those of the healthy side (both P < 0.05). The number of modulated fibers of the medium nerve increased along with the time, however, the number of the affected side were significantly lower than those of the healthy side (all P < 0.05). Electron microscopy showed degeneration of medulla in bilateral medium nerves 1 week later, and newborn modulated fibers began to be seen since 2 weeks later. However, there were a greater number and more complete structure in the healthy side in comparison with the affected side. The wet weights of bilateral superior digital flexor muscles decreased 2 weeks later and then began to increase gradually. However, the wet weight 4 and 8 weeks later were significantly greater in the healthy side then in the affected side (both P < 0.05).
Resection of sympathetic nerve is advantageous on nerve regeneration.
Zhonghua yi xue za zhi 04/2006; 86(15):1069-72.
ABSTRACT: To identify factors associated with industrial hand injuries by punch machines.
From September, 1999 to June, 2000, 108 patients of industrial hand injuries by punch machines were collected. For each patient, 2 controls were randomly selected. One was from the same industry; the other was from a big industry with thousands of punch machines. They matched on gender, job and age. In-person interviews were conducted to collect data on demographics, work history, work characteristics, work injuries, work organization, health behaviors, anthropometric and psychological factors. The Eysenck Personality Questionnaire (EPQ) was selected to evaluate the psychological performance. Risk factors were examined via multivariate logistic regression techniques.
There were four important factors affecting hand injuries by punch machines: The first was the length of service index (odds ratio [OR] = 0.972, 95% confidence interval [CI] = 0.957, 0.988). The second index was neuroticism (OR = 1.649, 95% CI = 1.264, 2.151). A safety equipment index (OR = 0.260, 95% CI = 0.123, 0.547) and a safety operation criterion index (OR = 0.136, 95% CI = 0.064, 0.286) were also significant factors.
Results suggest that the accident-prone population are those who have shorter service length and neurotic psychological performance. It may reduce the incidence of industrial hand injuries by punch machine to strengthen the appliance of safety equipment and enforcement of safety operation criterion, especially to the accident-prone population.
Zhonghua yi xue za zhi 10/2002; 82(18):1257-60.
ABSTRACT: To investigate anatomical mechanism of the ulnar wrist pain caused by the compression of the dorsal branch of the ulnar nerve, and discuss the diagnosis and treatment of the compression.
40 sides of the upper extremities of adult cadavers were studied anatomically. The dorsal branch of the ulnar nerve and its relationship to the surroundings was dissected and observed grossly and microscopically. 13 cases of the compression of the dorsal branch of the ulnar nerve were treated and followed up.
The dorsal branch of the ulnar nerve was penetrated from the deep of the flexor carpi ulnaris muscle 5.6 approximately 6.8 cm proximally from the styloid process of the ulna, then ran along the ulna and divided into 2 approximately 3 big branches at the medial side of the head of the ulna. The transverse branch was apt to injury during wrist movement as it crossed or rounded the head of the ulna where it was close to the peristeam. Seven of 13 cases of the compression of the dorsal branch of the ulnar nerve were treated by local block, and 6 by surgical neurolysis. Nine cases of this group got showed good effect without recurrence after 4 months to 1 year follow-up.
The anatomical basis of the compression of the dorsal branch of the ulnar nerve is repetitive traction to this nerve during wrist movement, and the compression of the transverse branch is the main cause of ulnar wrist pain. The compression of the dorsal branch of the ulnar nerve should be considered to the patients with ulnar wrist pain and abnormal sensation along the dorsal ulnar side of hand.
Zhonghua wai ke za zhi [Chinese journal of surgery] 04/2002; 40(3):210-3.