Peripheral nerve stimulation by time-varying magnetic fields.

PURPOSE: A study was performed to assess the stimulation threshold for healthy adults using sinusoidally oscillating gradients. METHOD: One hundred thirteen healthy adults were examined in the study. ECG and physiological parameters were measured. All measurements were performed of both the head and the abdomen. The subjects were measured in the supine position with the region of interest positioned in the center of the gradient coils. The measurement was performed for three orthogonal, four oblique, and double oblique orientations. RESULTS: No volunteer reported painful, severe stimulation. The mean thresholds for peripheral stimulation in head and body measurement were similar: 85.5% of stimulation during examination of the head and 87.6% during measurements of the abdomen were reported when the y-gradient was used. CONCLUSION: The greatest frequency of reported stimulations occurs when the y-gradient is used. This was confirmed by the results and supports the hypothesis that orthogonal to the y-axis the body has its largest conductive loop, resulting in the strongest peripheral stimulation.

[Arterial vascular occlusion in penicillin allergy (author's transl)]. / Arterielle Gefässverschlüsse bei Penicillinallergie.

A nodular exanthema of the skin was observed in an 8-year-old girl. She had been treated with penicillin a few days ago because of a gastrointestinal infection. Continuation of penicillin treatment led to occlusion of larger arteries with gangrene of the forefoot. This was accompanied by septic temperatures and superinfected skin lesions. Angiologic and angiographic investigations showed a right-sided femoro-popliteal occlusion and occlusions of the arteries of the lower leg. On the left side there was spasm of the superficial femoral artery. After cessation of penicillin and high-dose steroid therapy rapid restitution occurred. Arterial spasms regressed, the occlusions remained persistent, but there was adequate collateral blood supply and ischaemic acral necroses healed. An allergic reaction of the intermediary type involving major arteries can be considered causative underlying pathology.

[On the reliable visualization of digital arteries as recorded by arteriography applying only local anesthesia and alcoholic drink (author's transl)]. / Zur sicheren Darstellung von Digitalarterien an Händen und Füssen in Lokalanästhesie nach oraler Alkoholgabe

Reliable visualization of arteries in hands, fingers, feet and toes largely depends on the tone of peripheral vessels. This can be lowered by general anesthesia but also under local anesthesia if local warming and oral Alcohol are added. Differential diagnosis between organic and functional disturbances of circulation is guaranteed in this way. Digital arteries can be well shown right down to the tips of fingers and toes.