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D J Maiman

Publications and source records attributed to D J Maiman.

57 records · Page 4Linked to original sources
PubMedDate not supplied

Spasms in spinal cord injury: a study of 72 subjects.

Seventy-two patients with spinal cord injury of at least two years duration were reviewed retrospectively to determine incidence and effects of spasms. The average time between the injury and the examination was ten years. Seventy patients experienced spasms. In 50 patients (72%) the spasms appeared within six months after the injury. Historically, the spasms reached their maximal severity within 12 months. No significant difference was found in intensity and frequency of spasms between patients with clinically complete or incomplete spinal cord injury. Extensor spasms were seen more frequently than flexor spasms in the long-term patients. Patients with incomplete myelopathies had more extensor spasms than those with complete SCI.

Adult↗
PubMedDate not supplied

Determination of tissue viability in experimental electrical injuries.

Electrical burns or ischemia (induced by vascular ligation) were produced in the legs of 15 anesthetized dogs to study evolution of tissue changes compared with impedance alterations. After the application of 1-ampere currents at 60 Hz, animals were monitored from 1 to 4 days. Muscle impendance was measured with frequency sweeping to determine tissue destruction. Nuclear magnetic resonance spectroscopy (phosphorus 31) was used to assess metabolic activity, and results were compared to impedance measurements. In burned limbs, 70% reduction in muscle impedance was seen, which corresponds to decreased metabolic activity (absent organic phosphates) and suggests necrosis. Visually viable tissue had impedance decreases of 25% and levels of organic phosphates slightly lower than normal. Relaxation frequencies in dogs with severe burns exceeded 80 kHz; in viable tissue, 30 to 40 kHz (normal: 30 kHz). In ischemic muscle, organic phosphates decreased rapidly (1 to 2 hours); impedance changes evolved more slowly (1 day), but they ultimately reached the same degree of severity. Measurement of impedance may be a valuable adjunct in the evaluation of electrical burns, since significant changes strongly suggest nonviability.

Animals↗