Search PubMed⌕ Search

Biomedical subjects

N Iazigi

Publications and source records attributed to N Iazigi.

At least 37 records · Page 2Linked to original sources
PubMed1988

Effect of test meal temperature on the gastric emptying of liquids.

The effect of test meal temperature on the gastric emptying of 500 ml of 5% dextrose containing 12 MBq of 99mTechnetium-sulfur colloid was studied in eight healthy volunteers using a quantitative scintigraphic technique. Four different temperatures, 4, 20, 37 and 55 degrees C, were investigated in random order. Gastric emptying of the test meal at each temperature was mono-exponential and measurable as a half-life. The half-life of the meal at 20 degrees C (median, 35.6 min; range, 21.7-62.6 min) did not differ significantly (P greater than 0.10) from that obtained at 37 degrees C (median, 34.3 min; range, 20.1-60.5 min). In comparison to 37 degrees C, the half-life was longer for meals at 4 degrees C (median, 48.9 min; range, 20.9-77.5 min) and at 55 degrees C (median, 60.7 min; range, 33.5-79.0 min) although statistically different only at 55 degrees C (P less than 0.01). These results confirm the view that liquid meals, colder or warmer than body temperature have an inhibitory effect on gastric emptying and show that a significant delay in gastric emptying of liquids is obtained only with a warmer meal.

Adult↗
PubMed1987

The role of the autonomic nervous system in the resting tachycardia of human hyperthyroidism.

The mechanisms that control resting heart rate in hyperthyroidism were evaluated in six patients before and after treatment with propylthiouracil. The patients were subjected to pharmacological blockade under resting conditions in two experimental sessions: first session, propranolol (0.2 mg/kg body weight); second session, atropine (0.04 mg/kg body weight) followed by propranolol (0.2 mg/kg body weight). All drugs were administered intravenously. Resting heart rate was significantly reduced from 100 +/- 6.5 beats/min to 72 +/- 2.5 beats/min (P less than 0.005) after clinical and laboratory control of the disease. After double blockade, intrinsic heart rate was reduced from 105 +/- 6.8 beats/min before treatment to 98 +/- 6.0 beats/min after treatment (P less than 0.025). The reduction in heart rate caused by propranolol was not significantly different before (-13 +/- 1.4 beats/min) and after (-9 +/- 1.0 beats/min) propylthiouracil. In contrast, atropine induced a higher elevation of heart rate after treatment (45 +/- 8.6 beats/min) than before treatment (26 +/- 4.0 beats/min). The present results suggest no appreciable participation of the sympathetic component of the autonomic nervous system in the tachycardia of hyperthyroidism, at least under the conditions of the present study. The small change observed in intrinsic heart rate, although significant, seems to indicate that this is not the most important mechanism involved in this tachycardia. Our results suggest that an important reduction in the efferent activity of the parasympathetic component participates in the mechanisms that modify resting heart rte in hyperthyroidism.

Adult↗
PubMed1987

Multiple pulmonary thromboembolism diagnosed by two-dimensional echocardiography.

A 55-year-old man was admitted to our hospital because of progressive dyspnea, orthopnea and hemoptysis. Two-dimensional echocardiography multiple echo-dense images 1-4 mm in diameter were consistently seen crossing the tricuspid valve. A hypothesis of multiple pulmonary thromboembolism was raised. Clinical and postmortem evidence were later obtained to confirm this diagnosis.

Echocardiography↗
PubMed1982

Pubertal maturation of the lh stimulatory response to clomiphene citrate in congenital virilizing adrenal hyperplasia.

To determine the LH release response to clomiphene citrate in children with virilizing congenital adrenal hyperplasia (CAH), we examined six patients with glucocorticoid-treated virilizing CAH, five girls and one boy, chonological age (CA) 4 years 2 months-15 years 9 months and bone age (BA) range 8-18 years. All the patients but one, were treated with nocturnal dexamethasone. Their ages at the onset of treatment ranged from 2 years 6 months to 13 years 8 months. An additional boy (CA = 4 years 3 months and BA = 7-8 years) was studied 10 days after removal of a virilizing adrenal adenoma. Clomiphene citrate (3mg/kg/day) was administered orally in two doses/day for 8 days. Venous blood was collected on days 0, 4, 6 and 8. Two patients were also studied in consecutive years. In three patients no increase was noted over the basal levels of LH, but in the others LH rose during clomiphene administration. In two patients studied in consecutive years, there was detectable shift of LH release pattern. The basal LH levels and the sum of responses (day 4, 6 and 8) to clomiphene citrate and particularly their decimal logarithms were statistically significantly correlated with their respective BA. These results confirm that previous prolonged exposure to elevated concentrations of adrenal sex steroids, in children with treated virilizing CAH, may induce precocious maturation of the hypothalamic pubertal mechanism of LH secretion. This maturation was closely correlated with the degree of skeletal maturation.

Adrenal Hyperplasia, Congenital↗
PubMed1981

Effects of hemidecortication on the regulation of rat thyroid function.

1. Thyroid function in hemidecorticate and control rats was studied by the measurement of oxygen consumption (under basal conditions and after cold exposure) and radioiodine (131 I) uptake by the thyroid after a low-iodine diet for 30 days. 2. The oxygen uptake of male and female hemidecorticate rats under basal conditions (29 degrees C) did not differ significantly from that of the controls. The values observed for both experimental groups were relatively constant, ranging from 40 to 75 kcal h-1 m-2 for 2 to 50-day-old animals. 3. When hemidecorticate and control rats, age 60-65 days, were exposed to 7-8 degrees C for 5-6 h, the oxygen consumption of the hemidecorticate rats increased (83-84 kcal h-1 m-2) but to a lower extent than that of the controls (105-106 kcal h-1 m-2). 4. The rate of radioiodine (131 I) uptake by the thyroid gland of hemidecorticate rats was also lower than that of controls when the animals were maintained on a low-iodine diet. 5. These results show that, under basal conditions, the hypothalamic-pituitary-thyroid axis of hemidecorticate rats does not differ from that of control rats. However, when exposed to cold the hemidecorticate animals were not able to increase their oxygen consumption to the extent achieved by the control groups.

Animals↗
PubMedDate not supplied

[Nonfunctioning parathyroid cyst simulating thyroid nodule].

A parathyroid cyst is a rare disease. A 48 year old man with a nonfunctioning parathyroid cyst is described. The cyst was initially misdiagnosed and taken for a thyroid cyst based on physical examination, thyroid scan, sonography and needle biopsy. Cervical exploration was performed due to the recurrence of the lesion. The cyst was resected and histology showed it to be a parathyroid cyst. Pre and post operative clinical aspects are discussed.

Cysts↗
PubMedDate not supplied

[The effect of isosorbide dinitrate on esophageal emptying in chagasic megaesophagus].

The effect of 5 mg of sublingual dinitrate isosorbide (DNI) on the esophageal emptying of a semi-solid test meal labeled with 99mTc-sulfur colloid was studied by a scintigraphic technique in 18 chagasic patients with megaesophagus. DNI significantly reduced the esophageal retention measured at 0, 5, 10, 15, and 20 minutes after the end of the test meal ingestion. Five minutes after the meal not preceded by DNI the esophageal retention was always higher than 10% whilst 5 minutes after the meal preceded by DNI the retention was lower than 10% in 10 patients. These results indicate that DNI may be useful to reduce esophageal retention in chagasic megaesophagus.

Adult↗
PubMedDate not supplied

[Type 2 diabetic patients in a population sample from Ribeirão Preto area (São Paulo)].

To characterize the prevalence of long term diabetic complications (macroangiopathy, retinopathy, nephropathy and neuropathy) and their possible relation to the degree of metabolic control and duration of diabetes, we studied a hospital-based brazilian population sample of 546 non-insulin dependent diabetic patients. The group was subjected to a standardized evaluation protocol, including clinical characterization of the patients and their disease, current therapy, degree of metabolic control and presence of diabetic complications. The studied sample is of adult age range (25 to 84 years), with mean duration of diabetes of 8.0 +/- 6.8 years. Obesity was observed in 72.6% of the group and 232 patients (43.3%) had diabetics among their relatives. 92 (18.4%) patients have been treated with diet only, whereas 170 (32.6%) also used oral hypoglycemic agents, and 226 (43.7%) were using NPH insulin therapy (81.4% with single daily dose). The mean annual levels of fasting blood glucose (187 +/- 68mg/dl), urine glucose (9.6 +/- 16.7g/day) and glycosylated hemoglobin (12.2 +/- 3.3%) of the group, permitted a classification of the patients in: a) good metabolic control (106 pat. = 19.4%); b) regular control (264 pat. = 48.4%) and c) poor metabolic control (176 pat. = 32.2%). The prevalences of microvascular and neuropathic complications was: retinopathy = 29.1%, nephropathy = 11.3% and neuropathy = 50.9%. The observed increase in the prevalence of the complications was progressive according to the duration of the diabetes. In all time intervals of duration of diabetes, neuropathy was the most frequently observed complication. The prevalence of complications was always higher in the poorly controlled group compared to the patients in good metabolic control.(ABSTRACT TRUNCATED AT 250 WORDS)

Adult↗
PubMedDate not supplied

Radionuclide angiographic evidence for early predominant right ventricular involvement in patients with Chagas' disease.

Radionuclide angiography was used to study biventricular function in 11 noncardiac (group 1) and eight chronic cardiac chagasic patients (group 2). Results in chagasic patients were compared to those obtained in 10 normal subjects. Global ejection fraction and the standard deviation of peak (SDP) phase histogram were determined for each ventricle and qualitative evaluation of regional wall motion in both anterior and left anterior oblique projections was performed. Left ventricular dysfunction was markedly predominant in group 2, mean +/- SD ejection fraction 39.7 +/- 13.1% and SDP 29.8 +/- 15.6 degrees, as compared to group 1, in which these values were 56.7 +/- 9.9% (P less than 0.01) and 18.3 +/- 7.1 degrees (P less than 0.05), respectively. In contrast, severe right ventricular impairment was found equally in both groups: ejection fraction averaged 31.8 +/- 12.7 and 31.0 +/- 9.1%, and the mean SDP was 29.3 +/- 8.6 and 23.7 +/- 6.7 degrees, in groups 2 and 1, respectively. The qualitative analysis of segmental wall motion also showed apical and/or free-wall right dysynergy in all patients of group 1, while the same abnormalities were detected in six out of eight patients in group 2. These findings indicate that severe functional impairment of right ventricular performance is by far the most significant abnormality detected by radionuclide angiography in chagasic patients who are asymptomatic and have no other clinical sign of heart disease.(ABSTRACT TRUNCATED AT 250 WORDS)

Adult↗
PubMedDate not supplied

[Scintigraphic study of gallbladder emptying in chronic Chagas' disease].

Previous studies on gallbladder motility in Chagas' disease, which is known to be associated with diffuse destruction of intramural neurons, have produced conflicting results. In the present study we reevaluated this question by submitting chronic chagasic patients (n = 18) and controls (n = 12) to a cholescintigraphic study of gallbladder emptying in response to a single intra-venous injection of 60 ng/kg cerulein 90 min after administration of 99mTC-HIDA. Five min. before and immediately before carulein injection, as well as every 5 min. up to 45 min. after the stimulus, images of the gallbladder were obtained with a gamma-camera coupled to a computer. The counts obtained for regions of interest corresponding to the gallbladder, permitted the calculation of the ejection fraction of the organ and the construction of individual gallbladder emptying curves. The ejection fractions values for the total sample of chagasic patients (median 67.8%; variation, 4.0 to 99.0%), although higher than those for the control group (median: 34.2% variation, 13.1 to 88.0%), were not statistically significant (p greater than 0.05). However, analysis of the individual curves for the chagasics permitted identifying 2 subgroups, one of which (n = 9) showed values very similar to those for the controls, whereas the other (n = 9) showed a very rapid and intense gallbladder emptying. It is concluded that impairment of the gallbladder innervation in Chagas' disease may lead to heterogeneous patterns of gallbladder emptying, with some patients being definitely hypersensitive to an exogenous cholecystokinetic agent.

Adult↗
PubMedDate not supplied

[Protein-losing gastroenteropathies in children. Clinical, laboratory and therapeutic observations in 13 patients].

Thirteen children carrying protein-losing gastroenteropathy confirmed by the excretion fecal 51Cr albumin are presented. The ages ranged from 3 months to 12 years old, and the mean age of onset of symptom was 6 years 11 months old. Symptoms initiated between 3 to 7 years old in 11 patients. First and second grade malnutrition were detected within 10 cases. The most frequent clinical observation was diarrhea, found in 11 patients, followed by peripheral edema (10), anorexia (10), paleness (10), muscular hypotrophy (9), abdominal distension (8), ascite (7), wasted (7) and vomiting (5). The serum albumin level was below 2.5 g/100 ml in 12 patients, with and average of 1.7 g/100 ml. The gammaglobulin fraction was below 1.0 g/100 ml in 8 patients and lymphocytopenia in 5. Tests have shown a compromised fat absorption, thus, 7 among 8 lipiodol's test were negatives. The etiologic diagnosis were: paracoccidioidomycoses (5 patients), primary enteric lymphangiectasia (1), stronglyoidiasis (1), constrictive pericarditis (1), rheumatic carditis with double mitral lesion (1), Ménétrier's disease (1), short gut malabsorption syndrome (1), celiac disease (1) and cow's milk allergy (1). The responsible mechanism for the great loss of proteins to the digestive tube as well as diagnose and therapeutic aspects of the patients are commented. A report of 4 cases was done, as a way to show the pathology more characteristically due to protein losing gastroenteropathy.

Albumins↗