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CO2 cystometey (DISA 21G45 cystograph) was used in 153 patients for about one year and 6 months. 23 patients of them was compared with the results obtained with fill water cystometry and rapid fill CO2 cystometry. In 21 patients the cystometric pattern was the same for both methods. In 2 patients we found uninhibited contraction with watercystometrogram but not with CO2 cystometrogram. The medium volume at first desire to void was larger in watercystometrogram than in CO2 cystometry in the normal type of the bladder, but in cases of the spastic type the volume was almost the same for both methods. Bladder volume was larger in watercystometry than in CO2 cystometry in the normal and flaccid types, but in cases of the spastic type the volume was the same. We concluded that the CO2 cystometry was safer, simpler and more time-saving than watercystometry.

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