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Simultaneous registration of intraabdominal and intravesical pressures during cystometry in conscious rats—Effects of bladder outlet obstruction and intravesical PGE 2
Author(s) -
Lee Tack,
Andersson KarlErik,
Streng Tomi,
Hedlund Petter
Publication year - 2008
Publication title -
neurourology and urodynamics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.918
H-Index - 90
eISSN - 1520-6777
pISSN - 0733-2467
DOI - 10.1002/nau.20460
Subject(s) - medicine , cystometry , urination , urology , urinary bladder , catheter , anesthesia , detrusor muscle , urinary system , surgery
Abstract Aims A method was developed and evaluated to simultaneously register intraabdominal pressure (IAP) and intravesical pressure (IVP) during cystometry in conscious rats. In addition, IAP and IVP were recorded in rats with experimental detrusor overactivity (DO). Methods Sprague Dawley rats (n = 24) were used. Six female rats were subjected to partial bladder outlet obstruction for 2 weeks. A catheter was implanted into the bladder to record the IVP, and a balloon‐fitted catheter was positioned in the abdominal cavity to record the IAP. PGE 2 was given intravesically to induce DO. Detrusor pressure (DP) was defined as the IVP corrected for IAP. Results Recorded as increases in IAP, all rats of both sexes exhibited abdominal straining during every void. In controls, a maximal IAP of 6.0 ± 1.4 cmH 2 O (range 3–15 cmH 2 O) was registered (n = 12) at the time of the flow pressure (FP). Intravesical administration of PGE 2 or BOO did not affect the IAP at basal pressure, FP or micturition pressure. Changes in IAP due to movement or non‐voiding‐related straining were subtracted from IVP to generate DP and to visualize DO after BOO or intravesical PGE 2 . Conclusions The conscious rat uses abdominal straining during voiding, and maximal IAP is recorded at the onset of urinary flow. Simultaneous registration of IAP and IVP during the micturition cycle in conscious rats is a convenient method for accurate quantification of pressures inside the bladder and for studying “true” DO without interference from movement artifacts. Neurourol. Urodynam. © 2007 Wiley‐Liss, Inc.