A Comparative Study of Water Cystometry and CO₂ Cystometry

Abstract

Comparison of the results obtained with medium-fill water cystometry and rapid-fill CO₂ cystometry were done in 102 consecutive patients. In 99 patients the cystometric diagnoses were identical. In 3 patients we found detrusor hyperreflexia with water but a normal cystometrogram with CO₂. We concluded that CO₂ cystometry gives as valid information as water cystometry. Volume at first desire to void, bladder capacity and bladder compliance is approximately 50% higher in water cystometry than in CO₂ cystometry in normal cystometries. In cases of detrusor hyperreflexia there were no important differences in bladder volume at first uninhibited detrusor contraction or in highest intra-vesical pressure during detrusor contraction.

Bladder compliance in patients with benign prostatic hyperplasia

“…As the filling medium we adopted carbon dioxide, which is unphysiological and gives no information on voiding. Nordling et al [1978] described a comparative study of water cystometry and carbon dioxide cystometry. They concluded that carbon dioxide cystometry gives information as valid as that of water cystometry.…”

Detrusor Instability in Children with Recurrent Urinary Tract Infection and/or Enuresis

“…The discussion concerning the use of water opposed to CO2 during cystometry seems to continue still [11], We found it advantageous to use CO2 at a relatively high flow rate, since examination could thereby be terminated more quickly. Children are often impatient and this factor alone can influence the result of an examination [10].…”

Urinary Incontinence in the Female. The Value of Detrusor Reflex Activation Procedures

“…In a prospective study of 303 patients using medium fill water cystometry in the supine position (Walter, 1978), detrusor hyperreflexia was found in 15% of the patients. It has been shown that medium fill water cysto-metry and rapid fill COz cystometry have the same diagnostic specificity (Nordling et al, 1978b), so it seems unlikely that the different filling medium and filling rate are responsible for the difference. On the other hand, the technique used by Walter revealed only the type of detrusor hyperreflexia described in this paper as detrusor hyperreflexia Type 1A.…”