[Radon and internal contamination]. / Radon e contaminazione interna.

Because of hits everywhere presence in air and in water needful mediums for life, radon is a omnipresent risk for every person. Therefore, in relation to those vital functions, lungs and gastro-enteric tract represent the principal target organs of this noble radioactive gas (and mainly of hits radioactive daughters). International organisms evaluated the effective dose coefficients for both target organs, so it is possible e quantitative assessment of the exposure risk related to this noble gas.

[Renal transplant rejection. Role of color Doppler sonography and comparative evaluation of fluorometric and bioptic results]. / Il rigetto renale. Ruolo dell'eco color Doppler e valutazione comparativa dei risultati flussimetrici e bioptici.

BACKGROUND: Aim of this work is to evaluate the morphological changes of the waveforms found in the parenchyma of the renal transplant rejection, establishing the prognostic significance. METHODS: 46 patients with symptomatic renal allograft underwent color Doppler ultrasound examination. The ultrasound characteristics were evaluated. The Resistive Index (RI), the morphological waveforms (divided into two groups: group A with regular waveforms, group B with irregular waveforms). Color Doppler pattern (R.I. and waveforms) were compared to histological and cytological specimens and to mean values of creatinine before and after therapy. RESULTS: In group A, the creatinine values varied between the start of rejection symptoms and after some days, giving a significant statistic result. Group B didn't show any important variations. The RI mean value was higher in group B. Significant results concerning correlation between Doppler parameters and histological specimens were not observed. CONCLUSIONS: The conclusion is drawn that in renal transplant rejection it is important to keep in mind also the variation of the waveforms to establish the clinical prognosis.