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Biomedical subjects

P van Urk

Publications and source records attributed to P van Urk.

4 recordsLinked to original sources
PubMed1988

Renal function following open heart surgery: the influence of postoperative artificial ventilation.

In order to detect changes in renal perfusion and function in the postoperative period of open heart surgery, a prospective study of 21 patients following open heart surgery was performed. Cardiac output, renal blood flow, glomerular filtration and renal function parameters were determined during intermittent positive pressure ventilation (IPPV), and during spontaneous ventilation (SV). During IPPV, renal perfusion was found to be substantially decreased. The glomerular filtration rate was also reduced, but to a lesser extent, implying that the changes were due to a selective increase in postglomerular vascular resistance. The clearances of urea and creatinine were decreased during IPPV, but the clearances of osmoles and potassium were higher. The reabsorption of sodium, potassium and osmoles were also decreased during IPPV, but not that of urea. These findings are consistent with the development of increased renal venous pressure during IPPV, caused by impeded venous return to the heart. In the low cardiac output range a cardiac index in excess of 0.5l/min/m2 during IPPV seems necessary to achieve the same renal perfusion as during SV.

Acute Kidney Injury↗
PubMed1977

Absorption, distribution and excretion of the tritium-labelled beta2 stimulator fenoterol hydrobromide following aerosol administration and instillation into the bronchial tree.

The administration by aerosol of fenoterol hydrobromide (Berotec) was investigated in four test persons. Two patients with operable carcinomas of the lung were given tritium-labelled fenoterol hydrobromide aerosol immediately before undergoing surgery. Parts of the pulmonary segments removed were biochemically analysed and it was observed that the radioactive contents in pulmonary tissue and blood plasma were almost identical. The pharmacokinetic data recorded after aerosol administration, viz. plasma levels and renal excretion, are not different from those recorded after oral administration. The expired air following aerosol administration was examined in two patients, whereby less than 0.1% of the dose administered was recovered. The oropharynx on the other hand, was found to contain 53% of the dose immediately after administration. Absorption via the lungs was examined in four other test persons by instilling an aqueous solution of fenoterol hydrobromide into the right bronchial tree. Comparison of renal excretion levels showed that absorption here is greater than after oral administration; the plasma level curves, however, run a very similar course.

Administration, Oral↗