[The effect of extrarenal factors on certain functions of the kidney and urinary tract. A radionuclide study].

The authors present their experiences concerning the effect of extrarenal factors on the results of radionuclide examination. Functional and functional-morphological examinations of the kidneys and urinary tract can be negatively affected particularly by emotional stress, orthostasis, dehydration, increased kidney motility, address administered drugs during examination (diuretics), drug treatment of the primary disease, muscular strain, cold, pain, increased pressure in the vicinity of the kidney, hypertension, hypotension, as well as further conditions. Radionuclide methods can objectify these processes, the given negative effects can however be presumed to occur also at other examination procedures of the kidney and urinary tract. The conditions of examinations have thus to be optimized and standardized. The examining physician has to know which drugs the patient is receiving and he has to know their effect on renal function.