Non-invasive magnetopneumographic determination of lung dust loads in steel arc welders.

Freedman, Allan P.; Robinson, Stephen E.; O’Leary, Katie; Goodman, Lindsey R.; Stellman, Jeanne Mager

doi:10.1136/oem.38.4.384

Cited by 13 publications

(14 citation statements)

References 9 publications

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“…Artefacts associated with respiration are commonly observed in biomagnetic recordings and have been attributed to motion associated with magnetic contaminants in the lungs. [54][55][56] In our study, respiration, which occurs at a frequency much higher than the normal gastric frequency, did not affect the signal substantially. Thus, we believe that the primary benefit of suspension of respiration as we required of the subjects in this study is the concomitant reduction in subject motion that leads to a higher fidelity magnetic signal.…”

Section: Discussioncontrasting

confidence: 46%

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Biomagnetic characterization of spatiotemporal parameters of the gastric slow wave

Bradshaw

Irimia

Sims

et al. 2006

Neurogastroenterology Motil

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Certain gastric disorders affect spatiotemporal parameters of the gastric slow wave. Whereas the electrogastrogram (EGG) evaluates electric potentials to determine primarily temporal parameters, fundamental physical limitations imposed by the volume conduction properties of the abdomen suggest the evaluation of gastric magnetic fields. We used a multichannel superconducting quantum interference device magnetometer to study the magnetogastrogram (MGG) in 20 normal human subjects before and after a test meal. We computed the frequency and amplitude parameters of the gastric slow wave from MGG. We identified normal gastric slow wave activity with a frequency of 2.6 ± 0.5 cycles per minute (cpm) preprandial and 2.8 ± 0.3 cpm postprandial. In addition to frequency and amplitude, the use of surface current density mapping applied to the multichannel MGG allowed us to visualize the propagating slow wave and compute its propagation velocity (6.6 ± 1.0 mm s )1 preprandial and 7.4 ± 0.4 mm s )1 postprandial). Whereas MGG and EGG signals exhibited strong correlation, there was very little correlation between the MGG and manometry. The MGG not only records frequency dynamics of the gastric slow wave, but also characterizes gastric propagation. The MGG primarily reflects the underlying gastric electrical activity, but not its mechanical activity.

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Section: Discussioncontrasting

confidence: 46%

Section: Discussionmentioning

confidence: 40%

Biomagnetic characterization of spatiotemporal parameters of the gastric slow wave

Bradshaw

Irimia

Sims

et al. 2006

Neurogastroenterology Motil

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“…21-23 Among them, welders have shown the highest level of lung magnetisability. 21 Subjects without occupational exposure to dust showed negligible or low activities of lung magnetisability compared with welders. 21 22 No lifestyle factors are known to result in measurable magnetisability, although smoking can delay the lung clearance of magnetisable dust in occupationally exposed workers.…”

Section: Discussionmentioning

confidence: 95%

Change in obstructive pulmonary function as a result of cumulative exposure to welding fumes as determined by magnetopneumography in Japanese arc welders.

Nakadate¹,

Aizawa²,

Yagami³

et al. 1998

Occup Environ Med

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“…Cohen et al [13] observed a significant relation between asbestos retention in the lungs and the exposure index in asbestos miners and combustion workers. The compensated ex-miners were found to present with more intensive RMF than were miners and healthy nonexposed persons [14].…”

Section: Lung Magnetometry In Humansmentioning

confidence: 99%

Magnetometric evaluation of toxicities of chemicals to the lungs and cells

Aizawa

Kudo

2010

Environ Health Prev Med

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Because the lungs are exposed to airborne hazardous materials, alveolar macrophages (AMs) play a major role in defending against the exposure to various noxious chemical substances. In this study, we reviewed magnetometric investigations of the effects of various chemicals on the lungs and AMs. Magnetometry, using magnetite as an indicator, was used to evaluate the effects of certain chemicals on the lung and AMs. A rapid decrease of the remanent magnetic field after the cessation of external magnetization, a phenomenon called relaxation, was impaired when the lungs and macrophages were exposed to toxic substances. The delayed in vivo relaxation observed in the lungs exposed to magnetite and gallium arsenide was almost identical to the in vitro relaxation observed in the AMs exposed to the same materials. Delayed relaxation was observed in the AMs exposed to silica dust; various fibers, such as chrysotile and some manmade mineral fibers; and toxic arsenic and cadmium compounds. The extracellular release of lactate dehydrogenase activity was found in the AMs exposed to the chemicals. Relaxation is attributed to the cytoskeletondriven rotation of phagosomes containing magnetite. While the exact mechanism of delayed relaxation due to exposure to harmful chemicals remains to be clarified, cell magnetometry appears to be useful for the safety screening of chemical substances.

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Non-invasive magnetopneumographic determination of lung dust loads in steel arc welders.

Cited by 13 publications

References 9 publications

Biomagnetic characterization of spatiotemporal parameters of the gastric slow wave

Biomagnetic characterization of spatiotemporal parameters of the gastric slow wave

Change in obstructive pulmonary function as a result of cumulative exposure to welding fumes as determined by magnetopneumography in Japanese arc welders.

Magnetometric evaluation of toxicities of chemicals to the lungs and cells

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