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Biomedical subjects

J Mayo

Publications and source records attributed to J Mayo.

At least 91 records · Page 5Linked to original sources
PubMed1985

Magnetic resonance imaging of aneurysms of the abdominal aorta.

Experience with magnetic resonance imaging (MRI) of 10 normal control patients and 13 patients with known abdominal aortic aneurysms is presented. The aorta, renal artery origins, and iliac arteries were clearly identified in all control patients. Ten out of 13 aneurysms were optimally visualized. Three cases early in the experience were poorly seen and permitted less confident measurements. Renal artery origins were identified in 12 cases and judged to be uninvolved by the aneurysm in 11. Iliac arteries were identified in 11 cases and judged to be definitely aneurysmal in three. Sonography clearly depicted all 13 aneurysms. Correlation of the actual anteroposterior (AP) and transverse diameter aneurysm measurements with both techniques was excellent. Sonography failed to identify the renal artery origins in all cases, but could infer noninvolvement in two cases. Iliac arteries were seen in eight cases and judged definitely aneurysmal in three. According to these preliminary results, both MRI and sonography provide accurate AP and transverse outer wall measurements. MRI is superior in determining the presence of renal and/or iliac involvement. The authors recommend, however, that sonography continue to be the preliminary screening method.

Aorta, Abdominal↗
PubMed1984

Ultrasonic refraction by the rectus abdominis muscles: the double image artifact.

Using a real-time mechanical sector scanner in a transverse plane of section, the authors noticed that a double image of an intrauterine gestational sac or an intrauterine contraceptive device can be obtained when the transducer is passed over the midline of the abdomen. It was suggested that this is caused by refraction of the sound passing through the medial edges of both rectus abdominis muscles. The authors were able to reproduce this artifact in vitro using isolated human cadaver rectus muscles and imaging a single object in a water bath.

Abdominal Muscles↗
PubMed1984

Displacement of the diaphragmatic echo by hepatic cysts: a new explanation with computer simulation.

Previous demonstrations of distal displacement of interfaces deep to cystic structures have been based on only the slower speed of sound through the cystic structure, which has been postulated to cause an apparent discontinuity in the echo from the diaphragm deep to a cyst. The authors found cysts whose identification could not be explained by this theory because they were too small or the diaphragm was displaced in such a manner that the explanation would not hold true. They propose that, in addition to the slowing of the speed of sound through the cyst, refraction at the edge of the cyst can cause the apparent discontinuity. Since the machine does not distinguish the sound beam as having been refracted, the echo is displayed at the appropriate distance along the vector in the direction in which the transducer was pointing at the time. A computer simulation is used to confirm this theory.

Computers↗
PubMed1977

Corynebacterium equi infection complicating neoplastic disease.

Corynebacterium equi, a soil-residing diphtheroid pathogenic in horses, swine and cows, caused pulmonary infection with bacteremia in two patients with lymphomas. Both patients were being treated with immunosuppressive therapy, as were the patients in three previously reported human cases. Unless certain characteristics of these organisms are recognized, they may be regarded as normal flora or contaminating diphtheroids. They could also be mistaken for other gram-positive rods, such as Bacillus species, Listeria monocytogenes, or Erysipelothrix insidiosa. C. equi isolates have usually been sensitive to erythromycin, tetracycline, gentamicin, and carbenicillin. One of the patients reported here was successfully treated with erythromycin, tetracycline, and surgery.

Corynebacterium Infections↗