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Biomedical subjects

F Costa

Publications and source records attributed to F Costa.

170 records · Page 10Linked to original sources
PubMedDate not supplied

[Cholangiography via laparoscopy in the differential diagnosis of neonatal hepatitis and bile duct atresia].

Twenty-three infants with neonatal cholestasis were examined laparoscopically. The differential diagnosis between biliary atresia and neonatal hepatitis was not established by-clinical and laboratory investigations. In 10 out of 23 cases the transcutaneous-transhepatic-cholangiography, performed with laparoscopy demonstrated the permeability of the biliary tree in children that are not suffering from the atresia. The hepatic biopsy by laparoscopic view allowed to complete the investigation in these cases, avoiding unnecessary laparotomy. In infants suffering from biliary atresia the surgery indication was early and exact.

Bile Ducts↗
PubMedDate not supplied

[Pyloric diaphragm in an infant. A case report].

A case of incomplete pyloric diaphragm in an infant is reported. The literature is reviewed and the clinical and radiological findings are presented. The surgical therapy consisted of resection of the diaphragm followed by a pyloroplasty.

Diaphragm↗
PubMedDate not supplied

Vestibular influences on autonomic cardiovascular control in humans.

There is substantial evidence that anatomical connections exist between vestibular and autonomic nuclei. Animal studies have shown functional interactions between the vestibular and autonomic systems. The nature of these interactions, however, is complex and has not been fully defined. Vestibular stimulation has been consistently found to reduce blood pressure in animals. Given the potential interaction between vestibular and autonomic pathways this finding could be explained by a reduction in sympathetic activity. However, rather than sympathetic inhibition, vestibular stimulation has consistently been shown to increase sympathetic outflow in cardiac and splanchnic vascular beds in most experimental models. Several clinical observations suggest that a link between vestibular and autonomic systems may also exist in humans. However, direct evidence for vestibular/autonomic interactions in humans is sparse. Motion sickness has been found to induce forearm vasodilation and reduce baroreflex gain, and head down neck flexion induces transient forearm and calf vasoconstriction. On the other hand, studies using optokinetic stimulation have found either very small, variable, or inconsistent changes in heart rate and blood pressure, despite substantial symptoms of motion sickness. Furthermore, caloric stimulation severe enough to produce nystagmus, dizziness, and nausea had no effect on sympathetic nerve activity measured directly with microneurography. No effect was observed on heart rate, blood pressure, or plasma norepinephrine. Several factors may explain the apparent discordance of these results, but more research is needed before we can define the potential importance of vestibular input to cardiovascular regulation and orthostatic tolerance in humans.

Animals↗