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Biomedical subjects

T Tulassay

Publications and source records attributed to T Tulassay.

154 records · Page 9Linked to original sources
PubMed1981

[Tolazoline-HCl in cardio-respiratory adaptation of newborns with respiratory distress syndrome (author's transl)].

The pharmacological effects of Tolazoline were studied in newborns with different types of pulmonary diseases. The drug was given when the arterial pO2 remained below 6,65 kP in spite of PEEP, and when the right-to-left shunt was greater than 60%. Continuous monitoring of arterial blood pressure and pO2 were of particular importance. Permanent improvement was found in 50%. Transitional improvement in 30% of the cases and in the remaining 20% the drug had no observable effect.

Blood Circulation↗
PubMed1979

Alterations in creatinine clearance during respiratory distress syndrome.

Some renal parameters have been studied in newborns with respiratory distress syndrome (RDS). During the first 24 h, the serum creatinine level of the severe cases of RDS are significantly increased, decreasing gradually with improvement of the RDS and reaching normal values within 10 days. Blood urea nitrogen remained unchanged. In the milder cases of RDS, the serum creatinine also showed a slighter increase, which became normal within 4 days after birth. During the acute phase of RDS, there is a reversible impairment in the renal function, which correlates with the degree of hypoxia, hypercapnia and acidosis determined by the primary disease.

Blood Urea Nitrogen↗
PubMedDate not supplied

Effects of insulin on renal electrolyte handling.

It has been recognized that insulin, beside its functions on extrarenal metabolic processes, also modulates the renal handling of different electrolytes. The effects of one intravenously administered bolus (0.1 U/kg BW) of insulin on renal electrolyte handling were investigated in children. Insulin without affecting the filtration rate of creatinine and the urine flow rate resulted in significant increases in urinary calcium (3.56 +/- 0.80 vs. 7.48 +/- 0.80 mumol/min/1.73 m2) and magnesium (2.44 +/- 0.41 vs. 4.29 +/- 0.5 mumol/min/1.73 m2) and a fall in potassium excretion (53.25 +/- 13.17 vs. 23.71 +/- 4.21 mumol/min/1.73 m2). Phosphate excretion showed an initial fall followed by a more than twofold increase afterwards (6.52 +/- 0.92 vs. 3.14 +/- 0.92 and 15.29 +/- 3.82 mumol/min/1.73 m2, respectively). On the other hand, urinary sodium excretion was unaffected (171.21 +/- 27.22 vs. 166.23 +/- 22.86 mumol/min/1.73 m2). Our data show that insulin may modulate electrolyte homeostasis by inducing changes in their renal tubular handling.

Child↗
PubMedDate not supplied

Vasoactive hormones in familial pheochromocytoma with predominant norepinephrine secretion.

A family was investigated with an increased occurrence of pheochromocytoma. Three males out of 7 family members showed biochemical and morphological evidence of catecholamine-secreting tumor. Plasma concentrations of norepinephrine, aldosterone, arginine vasopressin and renin activity, as well as urinary excretion of norepinephrine, were enhanced in all the 3 patients. The plasma level of atrial natriuretic peptide decreased. After surgical removal of the tumor the hormonal alterations tended to be normalized; however, plasma concentration of norepinephrine remained above normal. The elevated plasma norepinephrine was postoperatively accompanied by slightly increased urinary norepinephrine excretion in 1 patient without any detectable tumor. The severity of the disease was most pronounced in the youngest patient, while in the oldest one a 'silent' pheochromocytoma was found. The occurrence of familial pheochromocytoma in successive generations may suggest an autosomal-dominant inheritance.

Adolescent↗
PubMedDate not supplied

Data on the degree of saturation of urine with respect to calcium hydrogen phosphate in hypercalciuric children and renal stone formers.

Calcium hydrogen phosphate (CaHPO4) was considered as one of the main factors governing renal calculus formation. The degree of saturation with respect to this phase was therefore calculated in urines of 36 hypercalciuric children (20 absorptive, 16 renal subtype) with isolated hematuria, 10 renal stone patients, and 30 healthy controls. The effects of low calcium diet and hydrochlorothiazide treatment were also investigated in the patient groups. The results were compared to the widely used indicator of hypercalciuria (Ca/Cr ratio). Urines of both the hypercalciuric and the normocalciuric renal stone patients were saturated on basal conditions. On low calcium diet, 12 children of the absorptive hypercalciuric, 13 of the renal hypercalciuric and 7 of the renal stone-forming children had their urines in the saturated zone - irrespective of the evolution of Ca/Cr ratio. Thiazide normalized the activity product of CaHPO4 in all groups. The use of the Ca/Cr ratio as the sole parameter in the investigation of children with isolated hematuria and hypercalciuria or calcium nephrolithiasis seems to be insufficient; simultaneous determinations of the state of saturation of urines is recommended. This technique should also allow a quantitative assessment of the various therapeutic regimens recommended.

Calcium Phosphates↗
PubMedDate not supplied

Effect of thiazide on urinary calcium excretion and hematuria in children with postglomerular hematuria.

The effect of short term hydrochlorothiazide therapy on urinary calcium excretion was compared to that of low calcium and a combined low calcium and low sodium diet in 30 children with postglomerular hematuria. On basal conditions 9 children were normocalciuric, 11 had absorptive, 10 renal hypercalciuria. The effect of thiazide treatment on the haematuria was also evaluated. Thiazide revealed to be more effective in reducing calcium excretion than low calcium diet alone in all groups (p less than 0.001 in normocalciuria; p less than 0.01 in both hypercalciuric groups). Combined low calcium--low sodium diet and thiazide treatment were equally effective in reducing calcium excretion in the hypercalciuric groups. On the first 3 days of thiazide treatment a slight increase of hematuria was observed; in the following period a significant decrease in the occurrence (p less than 0.01 in both hypercalciuric groups) and degree (p less than 0.01 in absorptive; p less than 0.02 in renal hypercalciuria) of hematuria was noted. These data furnish further evidence on the relation of hypercalciuria and post-glomerular hematuria.

Adolescent↗
PubMedDate not supplied

Studies on the urinary calcium excretion in children with hematuria of postglomerular origin: effects of the variation of dietary calcium and sodium intake.

The effect of different dietary regimens and of an oral calcium (Ca) load was studied in 30 children with postglomerular hematuria, 8 of whom were renal stone formers. In addition we investigated the urinary inorganic phosphate complex composition in 12 of them, based on the principles of complex equilibria. Twenty-one of the 30 hematuric children with a urinary Ca/creatinine (Ca/cr) ratio of greater than or equal to 0.6 (mmol/mmol) were regarded as hypercalciuric. Low calcium intake normalised the ratio in 11 patients, fulfilling the definition of absorptive hypercalciuria, but not in the other 10 patients with renal hypercalciuria. Sodium restriction combined with low calcium diet induced a further significant decrease of the urinary Ca/cr ratio to a normal range in both forms of hypercalciuria (mean +/- SD: 0.325 +/- 0.112 in absorptive hypercalciuria; 0.533 +/- 235 in renal hypercalciuria). There was a significant difference in the composition of phosphate complexes between the 6 normocalciuric patients and the 6 children with renal hypercalciuria investigated. Lithogenic urinary phosphate complexes (CaHPO4, MgHPO4) were excreted by the latter group in a significantly higher amount under basal conditions. On the basis of these data sodium restriction added to low calcium diet could represent a dietary approach in preventing excessive calcium excretion in idiopathic hypercalciuria, and therefore renal stone formation.

Adolescent↗
PubMedDate not supplied

The effect of somatostatin in dumping syndrome after gastric surgery.

The effect of somatostatin on early and late dumping syndrome was studied in 12 patients with gastric resection. Each patient underwent two glucose challenges with 75 gram of glucose administered orally. In the control study isotonic sodium chloride was given, while in the other study cyclic somatostatin in a dose of 80 ng/kg/min was given for a period of 270 minutes. In the control study all patients showed subjective symptoms of the early dumping syndrome with significant (p < 0.001) increases in pulse rate, hematocrit, and vasoactive intestinal polypeptide. Ten patients showed asymptomatic hypoglycemia, as a sign of the late dumping syndrome associated with a significant (p < 0.001) increase of insulin, gastric inhibitory peptide and glucagon levels. During the administration of somatostatin these changes failed to develop. The difference between the results of the two challenges are significant. These results indicate that somatostatin alleviates the symptoms both of early and late dumping syndrome partly by inhibiting the vasoactive intestinal polypeptide, gastric inhibitory peptide and insulin release, which are increased in dumping syndrome and may, therefore, be implicated as to have an etiological role.

Adult↗