PubMed Health⌕ Search

Biomedical subjects

C Michas

Publications and source records attributed to C Michas.

10 recordsLinked to original sources
PubMed1996

Direct right atrial catheter insertion with video-assisted thoracic surgery.

Chronic gastrointestinal disorders may require support with long-term total parenteral nutrition via a central venous catheter. Central venous access may be problematic because of infection or thrombosis of previous catheters. We report a case where video-assisted thoracic surgical catheter insertion directly into the right atrium provided a successful and safe method of long-term central venous access for parenteral nutrition.

Cardiac Catheterization↗
PubMed1994

Open-mouth posture and maxillary arch width in young children: a three-year evaluation.

A large biracial sample of children were assessed for open mouth posture and maxillary arch width once a year for 3 years. Analyses revealed that although the youngsters exhibited open-mouth posture at high levels, over time, there was a significant decrease in this behavior. Racial and gender differences, as well as a race-by-time interaction, were also evidenced. The children displayed a significant increase in maxillary arch width across time, with gender and racial differences seen in this growth pattern. Finally, when the youngsters were classified as exhibiting primarily open-mouth or closed-mouth posture, it was observed that children with open-mouth posture displayed a significantly slower pattern of maxillary growth compared with children who display anterior lip seal posture. The implications of the findings were discussed.

Analysis of Variance↗
PubMed1994

Laparoscopic repair of spigelian hernias.

Spigelian hernias can be difficult to diagnose and localize before surgical exploration. Four patients with abdominal wall hernias underwent laparoscopic diagnosis and repair of their spigelian hernias. The laparoscopic approach affords an accurate appraisal of the defect and a direct means of repair. Extensive dissection was avoided, and recovery was prompt.

Adult↗
PubMed1994

Laparoscopic repair of recurrent groin hernias.

Between November 1991 and May 1993, 54 recurrent groin hernias were laparoscopically repaired in 50 patients. Forty-eight were men and two were women. Forty-six recurrent hernias were unilateral and four bilateral. Twenty-five were direct, 19 indirect, 10 pantaloon, and two had a femoral component. In only 10 patients was the contralateral side normal. In 27 patients, the other side had been previously repaired, and in 13 they had a new contralateral hernia. A transabdominal preperitoneal technique was used to dissect and repair the entire floor in all patients. A single sheet of polypropylene mesh was used in the repair of the women patients, and a double-buttress technique with the first sheet slitted for the cord was used for the men. Patients were examined every 3 months for the first year and at 6-month intervals thereafter. Follow-up ranged from 1 to 18 months with a mean of 8 months. No patient was lost to follow-up, and no recurrence was observed. Patients returned to normal activity in an average of 1 week. Seroma, which resolved spontaneously, was the most common complication. The overall short-term results suggested that a laparoscopic mesh buttressed repair of recurrent groin hernias is technically feasible and can eliminate early rerecurrence of the hernia so commonly seen after repair of recurrent hernias.

Adolescent↗
PubMed1993

Rhinometry and open-mouth posture in young children.

A biracial sample of 348 elementary school children who were in the first grade were assessed for open-mouth posture (OMP) in the natural environment. In addition, rhinometry was performed on 296 of the children. Means were computed for percent OMP and cross-sectional nasal airway. Results indicated that, in general, these children exhibited relatively high rates of OMP. Boys displayed significantly greater OMP than girls, and black children showed significantly larger cross-sectional nasal areas than white children. A significant correlation between OMP and nasal area only was evident for children exhibiting OMP during more than 80% of the observation intervals. The implications of the findings were discussed.

Analysis of Variance↗
PubMed1993

Double-buttress laparoscopic herniorrhaphy.

To determine if laparoscopic inguinal herniorrhaphy can be performed safely in unselected patients, the authors' first 100 consecutive laparoscopic inguinal hernia repairs were reviewed. All patients with inguinal hernias who were candidates for general anesthetic were accepted for the study. Their ages ranged from 18 to 84 years. One hundred and six hernias were laparoscopically repaired in 95 males and 4 females. One male patient required an open hernia repair. The first 14 patients were repaired with a preperitoneal patch and plug technique, and the next 85 with the double-buttress transabdominal preperitoneal approach. Two pieces of polypropylene mesh were stapled to the transversalis fascia, ileopubic tract, and Cooper's ligament after the preperitoneal dissection of the hernia was completed. The first piece was placed over the indirect space, with a slit for the cord medially, and the second piece was placed over the entire direct and indirect area. Patients have been followed from 8-18 months. To date, no recurrence has developed. Complications have included seroma, inferior epigastric bleeding, trocar hernia, and neuralgia. Patients have returned to work and normal activity in 2 days to 2 weeks, with an average of 1 week.

Adolescent↗
PubMed1993

Open mouth posture and cross-sectional nasal area in young children.

A biracial sample of two-hundred ninety-six children were assessed for open-mouth posture (OMP) in the natural environment. In addition, rhinometry was performed on 288 of the youngsters. Means were computed for percent OMP and cross-sectional nasal airway. Results indicated that in general these children exhibited relatively high rates of OMP. Boys displayed significantly greater OMP than girls. However, children exhibiting OMP on 80% of the observation intervals had significantly smaller cross-sectional nasal areas than the youngsters who displayed OMP on fewer than 20% of observation intervals. The implications of the findings were discussed.

Analysis of Variance↗
PubMed1977

External carotid-vertebral artery anastomosis for vertebrobasilar insufficiency.

Two patients with previous brain stem infarction and current symptoms of vascular insufficiency in the basilar circulation had evidence of vertebral artery occlusive disease. Angiography demonstrated ostial stenosis of the dominant right vertebral artery and retrograde flow down the left vertebral artery to the level of the transverse process of C2 in the first case and to the level of a severely stenosed origin in the second case. Carotid circulation was patent in both cases. The blood flow in the posterior circulation was patent in both cases. The blood flow in the posterior circulation was augumented by extracranial anastomosis of the external carotid artery to the vertebral artery in the foramen transversarium at the level of C1-2 by a lateral approach in Case 1 and at the level of C4-5 by an anterior approach in Case 2. Postoperative improvement in neurologic status occurred in both cases.

Adult↗
PubMed1976

Sequential hepatic histologic and histochemical changes produced by diethylnitrosamine in the rhesus monkey.

Six young adult male rhesus monkeys were given diethylnitrosamine ip for 3-5 years. Liver biospies were done monthly. After 6 months, biopsy specimens showed individual hepatocytes and small foci of hepatocytes that were intensely positive for glycogen. During the second and later years, larger foci of such cells developed. In sections stained with hematoxylin and eosin, the glycogen-containing hepatocytes generally appeared unusually clear. Some hepatocytes, however, had eosinophilic or basophilic cytoplasm. Nuclear enlargement and atypic developed, particularly outside the foci. The hepatocytes within most foci were uniform in their histochemical features: glycogen was elevated, glucose-6-phosphatase was decreased, and ATPase activity was present not only along the bile canalicular surface but also along the enire cell membrane. After 3-5 years, neoplastic nodules and hepatocarcinomas developed in 5 of 6 animals. Two nodules and particularly the heptocarcinomas differed from the foci in one of more histochemical parameters. The findings suggested that the glycogen-containing, histochemically altered cells of the foci in one or more histochemical parameters. The findings suggested that the glycogen-containing, histochemically altered cells of the foci may be the first step in the development of neoplasia; further steps toward malignancy appeared to be frequently associated with additional alterations, such as loss of sinusoidal ATPase and re-formation of glucose-6-phosphatase.

Adenosine Triphosphatases↗