Gastric accommodation and motility are influenced by the barostat device: assessment with magnetic resonance imaging

The barostat is considered the gold standard for evaluation of proximal gastric motility especially for the accommodation response to a meal. The procedure is invasive because it involves the introduction of an intragastric catheter and bag and is not always well tolerated. Moreover, the barostat bag itself may influence motility. Nowadays magnetic resonance imaging (MRI) is able to measure several aspects of gastric motility noninvasively. To evaluate whether the accommodation response of the stomach, observed with the barostat, is present during MRI and whether the barostat interferes with gastric physiology, gastric accommodation, motility, and emptying were studied twice in 14 healthy subjects with MRI using three-dimensional volume scans and two-dimensional dynamic scans once in the presence of a barostat bag and once when the barostat bag was not present. Fasting and postprandial intragastric volumes were significantly higher in the experiment with barostat vs. without barostat (fasting: 350 ± 132 ml vs. 37 ± 21 ml, P < 0.0001; postprandial: 852 ± 126 ml vs. 361 ± 62 ml, P < 0.0001). No significant differences were found in gastric emptying (88 ± 41 vs. 97 ± 40 ml/h, not significant) and contraction frequency between both experiments. The accommodation response observed in the presence of the barostat bag was not observed in the absence of the barostat bag. In conclusion, the presence of an intragastric barostat bag does not interfere with gastric emptying or motility, but the accommodation response measured with the barostat in situ is not observed without the barostat bag in situ. Gastric accommodation is a nonphysiological barostat-induced phenomenon.

Download Full-text

Measurement of gastric emptying and gastric motility by magnetic resonance imaging (MRI)

Digestive Diseases and Sciences ◽

10.1007/bf02300384 ◽

1994 ◽

Vol 39 (S12) ◽

pp. 101S-103S ◽

Cited By ~ 41

Author(s):

W. Schwizer ◽

R. Fraser ◽

J. Borovicka ◽

G. Crelier ◽

P. Boesiger ◽

...

Keyword(s):

Magnetic Resonance Imaging ◽

Gastric Emptying ◽

Magnetic Resonance ◽

Gastric Motility ◽

Resonance Imaging ◽

Magnetic Resonance Imaging Mri

Download Full-text

Analysis of gastric accommodation and gastric emptying in healthy volunteers by magnetic resonance imaging (MRI)

Gastroenterology ◽

10.1016/s0016-5085(03)83415-7 ◽

2003 ◽

Vol 124 (4) ◽

pp. A674

Author(s):

Ivo R. Van der Voort ◽

Andreas Steingoetter ◽

Miriam Thumshirn ◽

Michael Fried ◽

Werner Schwizer

Keyword(s):

Magnetic Resonance Imaging ◽

Gastric Emptying ◽

Magnetic Resonance ◽

Healthy Volunteers ◽

Resonance Imaging ◽

Gastric Accommodation ◽

Magnetic Resonance Imaging Mri

Download Full-text

Measurement of proximal and distal gastric motility with magnetic resonance imaging

AJP Gastrointestinal and Liver Physiology ◽

10.1152/ajpgi.1996.271.1.g217 ◽

1996 ◽

Vol 271 (1) ◽

pp. G217-G222 ◽

Cited By ~ 8

Author(s):

W. Schwizer ◽

R. Fraser ◽

J. Borovicka ◽

K. Asal ◽

G. Crelier ◽

...

Keyword(s):

Magnetic Resonance Imaging ◽

Gastric Emptying ◽

Magnetic Resonance ◽

Gastric Motility ◽

Resonance Imaging ◽

Proximal Stomach ◽

Distal Stomach ◽

Basal Diameter ◽

Magnetic Resonance Imaging Mri ◽

Gastric Contractions

The precise motor mechanisms associated with gastric emptying of nutrient liquids are unclear, in part because of difficulties in measuring the motility from the proximal and distal stomach simultaneously. We have now examined proximal and distal gastric motility, using a novel magnetic resonance imaging (MRI) technique. In seven healthy volunteers (4 males, 3 females; 27-37 yr), gastric emptying and motility were determined on two occasions after ingestion of 500 ml 10% and 25% dextrose labeled with 1 mM gadolinium tetraazacyclododecane tetraacetic acid, using a 1.5-tesla Philips Gyroscan ACS II scanner. Gastric emptying was determined every 15 min with a series of transaxial scans. After each series of transaxial scans, 120 coronal scans, 1.2 s apart, were performed through the antrum and proximal stomach. For each coronal slice the diameters of the proximal stomach and the antrum were measured to determine the number of contractions per minute and depth (%basal diameter). Gastric emptying (half-emptying time) was faster after ingestion of 10% compared with 25% dextrose (49 +/- 15 vs. 118 +/- 37 min; P < 0.01). After both meals, the diameter of the proximal stomach remained relatively constant, whereas there were marked fluctuations in the diameter of the antrum. Mean (+/- SD) frequency (2.8 +/- 0.6 vs. 2.0 +/- 0.8/min; P < 0.001) and depth (40 +/- 17% vs. 34 +/- 16%; P < 0.04) of antral contractions were higher after 10% dextrose compared with 25% dextrose. Rapid MRI techniques allow simultaneous measurement of both gastric emptying and motor function of different gastric regions. The increase in the frequency and depth of distal gastric contractions during ingestion of 10% compared with 25% dextrose supports the concept that the antrum contributes to the regulation of gastric emptying of nutrient liquids.

Download Full-text

Computed Tomography and Magnetic Resonance Imaging-aided Diagnosis of Primary Essential Cutis Verticis Gyrata: A Case Report with 5-year Follow-up and Review of the Literature

Current Medical Imaging Formerly Current Medical Imaging Reviews ◽

10.2174/1573405614666181005113448 ◽

2019 ◽

Vol 15 (9) ◽

pp. 906-910

Author(s):

Hongzhang Zhu ◽

Shi-Ting Feng ◽

Xingqi Zhang ◽

Zunfu Ke ◽

Ruixi Zeng ◽

...

Keyword(s):

Magnetic Resonance Imaging ◽

Magnetic Resonance ◽

Three Dimensional ◽

Stable Condition ◽

Resonance Imaging ◽

Mri Findings ◽

Cutis Verticis Gyrata ◽

Essential Form ◽

History Of ◽

Magnetic Resonance Imaging Mri

Background: Cutis Verticis Gyrata (CVG) is a rare skin disease caused by overgrowth of the scalp, presenting as cerebriform folds and wrinkles. CVG can be classified into two forms: primary (essential and non-essential) and secondary. The primary non-essential form is often associated with neurological and ophthalmological abnormalities, while the primary essential form occurs without associated comorbidities. Discussion: We report on a rare case of primary essential CVG with a 4-year history of normal-colored scalp skin mass in the parietal-occipital region without symptom in a 34-year-old male patient, retrospectively summarizing his pathological and Computer Tomography (CT) and magnetic resonance imaging (MRI) findings. The major clinical observations on the CT and MR sectional images include a thickened dermis and excessive growth of the scalp, forming the characteristic scalp folds. With the help of CT and MRI Three-dimensional (3D) reconstruction techniques, the characteristic skin changes could be displayed intuitively, providing more evidence for a diagnosis of CVG. At the 5-year followup, there were no obvious changes in the lesion. Conclusion: Based on our observations, we propose that not all patients with primary essential CVG need surgical intervention, and continuous clinical observation should be an appropriate therapy for those in stable condition.

Download Full-text

OP20.05: Three-dimensional ultrasonography and magnetic resonance imaging (MRI) in the diagnosis of deep endometriosis

Ultrasound in Obstetrics and Gynecology ◽

10.1002/uog.13830 ◽

2014 ◽

Vol 44 (S1) ◽

pp. 125-125

Author(s):

S. Guerriero ◽

L. Saba ◽

J. Alcazar ◽

M. Pascual ◽

S. Ajossa ◽

...

Keyword(s):

Magnetic Resonance Imaging ◽

Magnetic Resonance ◽

Three Dimensional ◽

Resonance Imaging ◽

Deep Endometriosis ◽

Magnetic Resonance Imaging Mri

Download Full-text

Switchable 19F MRI polymer theranostics: towards in situ quantifiable drug release

Polymer Chemistry ◽

10.1039/c7py00345e ◽

2017 ◽

Vol 8 (34) ◽

pp. 5157-5166 ◽

Cited By ~ 15

Author(s):

A. V. Fuchs ◽

A. P. Bapat ◽

G. J. Cowin ◽

K. J. Thurecht

Keyword(s):

Magnetic Resonance Imaging ◽

Magnetic Resonance ◽

Hyperbranched Polymer ◽

Relaxation Times ◽

Mri Contrast Agent ◽

Resonance Imaging ◽

Mri Contrast ◽

19F Mri ◽

Magnetic Resonance Imaging Mri

A switchable polymeric 19F magnetic resonance imaging (MRI) contrast agent was synthesised whereby the transverse (T2) relaxation times increased as a therapeutic was released from a hyperbranched polymer (HBP) scaffold.

Download Full-text

Applicability of Magnetic Resonance Imaging in the Assessment of Fetal Urinary Tract Malformations

Canadian Association of Radiologists Journal ◽

10.1016/j.carj.2018.10.006 ◽

2019 ◽

Vol 70 (1) ◽

pp. 83-95 ◽

Cited By ~ 2

Author(s):

Tatiana Mendonça Fazecas ◽

Edward Araujo Júnior ◽

Heron Werner ◽

Pedro Daltro ◽

Alberto Borges Peixoto ◽

...

Keyword(s):

Magnetic Resonance Imaging ◽

Urinary Tract ◽

Magnetic Resonance ◽

Three Dimensional ◽

Surface Coil ◽

Resonance Imaging ◽

Magnetic Resonance Imaging Mri ◽

Urinary Tract Malformations ◽

Weighted Sequences ◽

Urinary Tract Anomalies

Objective To assess the applicability of magnetic resonance imaging (MRI) to complement ultrasound in the diagnosis of fetal urinary tract anomalies. Methods This was a retrospective cohort study that included 41 women between 19 weeks and 37 weeks and 6 days of gestation carrying fetuses with malformations of the urinary tract which were initially diagnosed by ultrasound and then referred for MRI. In all cases, the diagnosis was confirmed after birth either through imaging or autopsy. A surface coil was positioned over the abdomen and T2-weighted sequences were obtained in the axial, coronal, and sagittal planes; T1 in at least one plane; and three-dimensional (3-D) TRUFI in fetuses with dilatation of the urinary tract. Results Mean gestational age at the time of MRI examination was 28.21 weeks. The rapid T2 sequences allowed all the anomalies of the fetal urinary tract to be assessed, whereas 3-D TRUFI sequencing proved very useful in evaluating anomalies involving dilatation of the urinary tract. The signs of pulmonary hypoplasia characterized by hypointense signal in the T2-weighted sequences were identified in 13 of the 41 fetuses. Conclusion MRI confirmed and added information to the ultrasound regarding fetal urinary tract anomalies, as well as information related to the other associated malformations, their progress in the prenatal period, and possible postnatal prognosis.

Download Full-text

Magnetic Resonance Imaging of the Anal Region: Clinical Applications

Journal of Clinical Imaging Science ◽

10.25259/jcis_180_2020 ◽

2020 ◽

Vol 10 ◽

pp. 76

Author(s):

Giuseppe Cicero ◽

Giorgio Ascenti ◽

Alfredo Blandino ◽

Socrate Pallio ◽

Claudia Abate ◽

...

Keyword(s):

Magnetic Resonance Imaging ◽

Magnetic Resonance ◽

Anal Canal ◽

Three Dimensional ◽

Resonance Imaging ◽

Pictorial Review ◽

Clinical Scenarios ◽

Mri Protocol ◽

Magnetic Resonance Imaging Mri ◽

Dedicated Mri

Over the past years, magnetic resonance imaging (MRI) has become a cornerstone in evaluating anal canal and adjacent tissues due to its safeness, the three-dimensional and comprehensive approach, and the high soft-tissue resolution. Several diseases arising in the anal canal can be assessed through MRI performance, including congenital conditions, benign pathologies, and malignancies. Good knowledge of the normal anatomy and MRI technical protocols is, therefore, mandatory for appropriate anal pathology evaluation. Radiologists and clinicians should be familiar with the different clinical scenarios and the anatomy of the structures involved. This pictorial review presents an overview of the diseases affecting the anal canal and the surrounding structures evaluated with dedicated MRI protocol.

Download Full-text