Study of the magnetic content movement present in the large intestine

Ferreira, A. A.; Carneiro, Adriana Munhoz; Moraes, Éder Rezende; Oliveira, Ricardo Brandt de; Baffa, Oswaldo

doi:10.1016/j.jmmm.2004.05.011

Cited by 16 publications

(11 citation statements)

References 8 publications

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“…In both cases, well defined peaks at around 3 cycles min-, corresponding to the colon contractile activity frequency, axe observed. The same frequency was observed by manometric measurements (ScoTT, 2003), electrical measurements (COWLES et al, 1995) and, by FERREIRA et al (2004, using another biomagnetic technique. In contrast, the breathing activity was only detected when measurements were taken in the torso region above the descending colon section.…”

Section: Methodssupporting

confidence: 67%

Spatiotemporal evaluation of human colon motility using three-axis fluxgates and magnetic markers

Córdova–Fraga

Carneiro

Araújo

et al. 2005

Med. Biol. Eng. Comput.

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An alternative method to study the mechanical activity of the human colon in fasting and postprandial states is presented. The method is based on measurements of the magnetic fields produced by a magnetic marker, a small cylindrical NdBFe magnet, when it was ingested by the subjects. A portable magnetic probe, consisting of two digital three-axis fluxgate magnetometers, arranged in a first-order electronic gradiometer, was implemented for this research. Measurements were taken in 16 healthy male subjects. Contractile activity frequency measurements were taken along the colon length, including the ascending, transverse and descending sections, as well as the rectal sigmoidal section. Values for the contractile activity frequency of 2-5 cycles min(-1) were measured. The set-up is simple, low-cost and suitable for use in an unshielded environment.

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Section: Methodssupporting

confidence: 67%

Spatiotemporal evaluation of human colon motility using three-axis fluxgates and magnetic markers

Córdova–Fraga

Carneiro

Araújo

et al. 2005

Med. Biol. Eng. Comput.

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“…Magnetite nanoparticles are suitable for MRI contrast (Bean et al, 1959, Koenig et al, 1987. Magnetite particles have been proposed for oral use as magnetic resonance contrast agents and magnetic markers to study the gastrointestinal motility (Briggs et al, 1997, Ferreira et al, 2004. The gastric secretions include pepsin, mucus, and HCl (Paulev, 1999(Paulev, -2000 and magnetite particle dissolution may take place during their passing through the stomach.…”

Section: Magnetic Resonance Imaging (Mri) Is a Non-invasive Techniquementioning

confidence: 99%

Tailored and Functionalized Magnetite Particles for Biomedical and Industrial Applications

Durdureanu-Angheluta¹,

Pinteală²,

Simionescu³

2012

Materials Science and Technology

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“…Colonic motor function is evaluated by manometry, but requires bowel preparation and presents difficulty in accessing the ascending colon 19,20 . A fluxgate magnetometer can also be employed to record colonic motility by exploring the field remaining after a magnetization of particles, 21 although it has short‐time recordings, strongly dependent on relaxation of the magnetic particles.…”

Section: Introductionmentioning

confidence: 99%

A novel biomagnetic approach to study caecocolonic motility in humans

Romeiro

Corá

Andreis

et al. 2006

Neurogastroenterology Motil

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Motility patterns play a major role in human colonic functions; however, its physiological significance is poorly understood. Several studies have been introducing the Alternating Current Biosusceptometry (ACB) as a valuable tool in gastroenterology and pharmaceutical research. Using gold standard techniques, great effort has been made to validate ACB as a method for measuring gastrointestinal motility in humans and animals. The aim of this study was to evaluate caecocolonic motility and its response to a meal in healthy volunteers. The results showed a dominant frequency of 3.17 ± 0.13 cycles per minute (mean ± SD) that remained unchanged even after a standardized meal (P > 0.01). The colonic response to a meal was recorded as a considerable increase in amplitude, reflected by motility index (P < 0.01) and was observed for all the volunteers. The caecocolonic motility could be assessed by the ACB providing new insights into physiological patterns of motility. Moreover, the method is non-invasive, radiation-free, cost-effective and independent of bowel preparation.

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Study of the magnetic content movement present in the large intestine

Cited by 16 publications

References 8 publications

Spatiotemporal evaluation of human colon motility using three-axis fluxgates and magnetic markers

Spatiotemporal evaluation of human colon motility using three-axis fluxgates and magnetic markers

Tailored and Functionalized Magnetite Particles for Biomedical and Industrial Applications

A novel biomagnetic approach to study caecocolonic motility in humans

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