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Biomedical subjects

R A Werner

Publications and source records attributed to R A Werner.

43 records · Page 3Linked to original sources

Clinical management of carpal tunnel syndrome in patients with long-term sequelae of poliomyelitis.

Thirty-three patients with long-term sequelae of poliomyelitis with a diagnosis of carpal tunnel syndrome established by either abnormal nerve conduction studies or previous carpal tunnel surgery were surveyed. There was no significant long-term resolution of symptoms in the patients who had surgery (n = 9) or were currently using wrist orthoses (n = 11) compared with patients without such treatment (n = 13). In patients who used a single cane or those who used crutches (N = 10), there was a direct correlation between the hand holding the cane or crutch and the hand in which carpal tunnel syndrome developed. The chronic use of cane and crutch predisposes these patients to development of carpal tunnel syndrome, and caution should be used when considering wrist surgery.

Canes↗

Paraplegia and quadriplegia after intrathecal chemotherapy.

Transient or permanent paraplegia after the use of intrathecal (IT) methotrexate (MTX) or cytosine arabinoside (Ara-C) for treatment or prophylaxis of patients with meningeal leukemia is an unusual complication, with an incidence of less than 3% among such patients. Only 15 cases involving IT MTX have been documented and even fewer with IT Ara-C. Three patients were studied who developed permanent or ascending myelopathy from treatment of their leukemia or rhabdomyosarcoma with IT chemotherapy. The patients' ages ranged from 7 to 62 years. Two of the three patients had electromyographic examinations. These revealed a primary motor neuron degeneration or a polyradiculopathy, superimposed on a mild axonal peripheral neuropathy associated with vincristine therapy. This is consistent with other electromyographic studies. Two of the patients showed an elevation of the cerebral spinal fluid (CSF) protein before development of paraplegia; one also showed a rise in myelin basic protein associated with his myelopathy. Neuropathologic findings suggest demyelination as the primary process leading to myelopathy. Increasing evidence has shown that total CSF protein, or more specifically, the myelin basic protein, may be elevated before development of paraplegia. Routine serial testing of the CSF for total protein could be used as a screening test during therapy.

Adult↗

Visceral blood flow distribution during exercise to exhaustion in conscious dogs.

We measured changes in organ blood flow (OBF) distribution and systemic hemodynamics in 9 dogs running 5-13 km/h during steady-state (SS) and exhaustive (EE) exercise on a treadmill at 8-15% grade for an average of 35 min. SS was defined when a heart rate (HR) of 80% maximum was attained and when HR was constant for 5-8 min. EE was defined as when the dog collapsed, unable to run longer. We measured heart rate, mean aortic pressure, cardiac output, and stroke volume via implanted probes and catheters. All hemodynamic parameters rose significantly (P less than 0.05) with exercise. Stroke volume and aortic pressure did not rise above SS levels during EE. OBF, determined with microspheres, to the liver, stomach, and intestines declined during SS and returned to control levels during EE. OBF to the kidneys and pancreas was not significantly changed by either SS or EE. OBF to the spleen declined progressively with SS and EE. We concluded that 1) the effect of exercise on OBF depends on the severity of exercise, emphasizing the need to quantify work loads in exercise studies, and 2) the splanchnic organs do not respond homogeneously to exercise and that this response is not adequately described by % of CO assessments.

Animals↗

Effectiveness of an intensive outpatient rehabilitation program for postacute stroke patients.

The effectiveness of ongoing rehabilitation services for postacute stroke survivors is poorly documented. We designed a randomized control, single-blinded study to demonstrate the effectiveness of intensive outpatient therapy. The treatment intervention consisted of 1 hr each of physical and occupational therapy, four times per week, for 12 wk; therapy focused on neuromuscular facilitation and functional tasks. All subjects were screened before the therapies and after 3 mo and 9 mo. Forty-nine stroke survivors, who were at least l yr (mean, 2.9 yr) poststroke, were randomized with two treated patients to each control (no treatment supplied). All patients had received inpatient rehabilitation at the time of their acute stroke, but no patient had any ongoing therapy within the last 6 mo. The outcome measures included the Functional Independence Measure (FIM), Brunnstrom stages of motor recovery, timed mobility tasks, and the Jebson hand evaluation. We also evaluated the level of depression, self-esteem, and socialization. The treated patients demonstrated an improvement of 6.6 points over the 3 mo of therapy compared with only 1.5 points in the control group in the FIM motor score transformed using Rasch analysis. The change from time 0 to 3 mo was significant in the treated group but not in the controls. Treated patients maintained their gains at the 9-mo follow-up, and controls lost ground. The treated group improved in terms of socialization and self-esteem as evidenced by a lower Sickness Impact Profile, whereas the controls tended to get worse. There was a trend toward less depression, but this did not reach a P = 0.05 level of significance. This study demonstrates that significant functional gains can still be attained in the postacute stroke survivor, despite prior inpatient rehabilitation services.

Acute Disease↗

Comparison of multiple frequency vibrometry testing and sensory nerve conduction measures in screening for carpal tunnel syndrome in an industrial setting.

The value of vibrometry in the evaluation of carpal tunnel syndrome is controversial. Several investigators have suggested that vibrometry screening with multiple frequencies would improve the correlation and increase the sensitivity when screening for carpal tunnel syndrome. One hundred sixty-nine industrial workers from two manufacturing plants in southern Michigan were screened for median nerve impairment using both vibrometry (seven frequencies, 8-500 Hz) and electrophysiologic testing in each hand. The vibratory threshold at each frequency, as well as composite measures-Jetzer index and negative sums, were compared with electrophysiologic measures of amplitude and latency. The individual frequencies and the Jetzer index correlated with median sensory latency, but the relationships were weak (r = 0.22 to 0.32). Only at the lower frequencies (8, 16, and 32 Hz) did the vibratory threshold correlate with sensory amplitude; correlation ranged from 0.187 to 0.303. Vibration threshold sensation is most closely related to axonal loss or conduction block, but the earliest finding in carpal tunnel syndrome is that of demyelination; thus we would not expect an abnormal vibratory threshold with mild carpal tunnel syndrome. These results support this interpretation and suggest that vibratory screening for early carpal tunnel syndrome is not effective.

Carpal Tunnel Syndrome↗