Recently, we have established a model of severe stepwise normovolemic hemodilution to a hematocrit of 10 % in rats employing three different colloidal volume replacement solutions (Voluven, Volulyte and Gelafundin) that are routinely used in clinical practice at present. We did not see severe dilutional acidosis as to be expected, but a decline in urinary pH. We here looked on further mechanisms of renal acid excretion during normovolemic hemodilution. Bicarbonate, which had been removed during normovolemic hemodilution, was calculated with the help of the Henderson-Hasselbalch equation. The urinary amount of ammonium as well as phosphate was determined in residual probes. The absolute amount of free protons in urine was obtained from the pH of the respective samples. The amount of protons generated during normovolemic hemodilution was approximately 0.6 mmol. During experimental time (5.5 h), distinct urinary ammonium excretion occurred (Voluven 0.52 mmol, Volulyte 0.39 mmol and Gelafundin 0.77 mmol). Proton excretion via the phosphate buffer constituted 0.04 mmol in every experimental group. Excretion of free protons was in the range of 10-6 mmol. The present data prove that the prompt rise in urinary ammonium excretion is also valid for acute metabolic acidosis originating from severe normovolemic hemodilution., J. K. Teloh, I. N. Waack, H. de Groot., and Obsahuje bibliografii
Akutní subdurální hematom (ASDH) je nejčastější typ traumatického nitrolebního krvácení s vysokou morbiditou a mortalitou. Ve většině případů je nezbytné akutní operační řešení, vzácně je možné menší asymptomatické ASDH sledovat, jejich resorpce je většinou dlouhodobá, často s vytvořením chronického subdurálního hematomu (CSDH). Bylo popsáno pouze několik případů promptní resorpce ASDH, ale někteří autoři tvrdí, že je jejich incidence podhodnocena. Prezentujeme případ traumaticky vzniklého ASDH u mladé alkoholičky, u níž došlo k téměř kompletní resorpci hematomu za cca 20 hod., Acute subdural hematoma (ASDH) is the most common type of traumatic intracranial hemorrhage associated with high morbidity and mortality. The majority of cases require acute surgery. Monitoring may rarely be sufficient in smaller asymptomatic ASDH. Their resorption is usually prolonged and often associated with formation of chronic subdural hematoma (CSDH). Prompt resorption of hematomas have been described in a few cases only but some authors argue that their incidence is underestimated. We present a case of traumatic ASDH in a young alcoholic patient, in whom a follow-up CT of the brain performed about 20 hours later revealed almost complete resorption of the hematoma. Key words: acute subdural hematoma – chronic subdural hematoma – prompt resorption The authors declare they have no potential conflicts of interest concerning drugs, products, or services used in the study. The Editorial Board declares that the manuscript met the ICMJE “uniform requirements” for biomedical papers., and J. Kašík, J. Klener, L. Tittelbach, R. Tomáš, J. Šroubek, M. Mašek