Acute alterations in biochemistry, morphology and contractility of rat isolated urinary bladder via increased intra-abdominal pressure.
OBJECTIVE
To determine the acute effects of increased intra-abdominal pressure (IAP) on the biochemistry, morphology and contractility of the rat isolated urinary bladder using an experimental laparoscopy model.


METHODS
We divided 24 adult female Sprague-Dawley rats into three groups. The control group (group I) was not subjected to increased IAP. In groups II and III, IAPs of 10 and 20 mm Hg, respectively, were established by carbon dioxide pneumoperitoneum for 60 min. Thirty minutes after desufflation, the rat urinary bladder dome was removed for in vitro pharmacological investigation, measurement of malondialdehyde (MDA) levels and histopathological examination. Statistical comparisons between groups were performed.


RESULTS
Tissue MDA levels in groups II and III were significantly higher than in the control group. In group II, only the lamina propria was significantly damaged. However, the epithelium, lamina propria, and serosa were significantly damaged in group III. Acetylcholine potentiated contractions in both IAP groups. Increased responses to electrical field stimulation in the IAP groups were significant only in group II.


CONCLUSIONS
In this experimental model, 10 and 20 mm Hg of IAP induced by pneumoperitoneum increased MDA levels and caused important changes in the morphology and contractile response of the urinary bladder.
Unsal
Mesut A
MA
Department of Obstetrics and Gynecology, Karadeniz Technical University, Faculty of Medicine, Trabzon, Turkey. mesutunsal@meds.ktu.edu.tr
Imamoğlu
Mustafa
M
Cay
Ali
A
Kadioglu
Mine
M
Aydin
Sevim
S
Ulku
Cunay
C
Kesim
Murat
M
Alver
Ahmet
A
Bozkaya
Hasan
H
D034841:Abdominal Cavity; D000818:Animals; D005260:Female; D010535:Laparoscopy; D008315:Malondialdehyde / Q000032:analysis; D008365:Manometry; D009119:Muscle Contraction / Q000502:physiology; D009130:Muscle, Smooth / Q000502:physiology; D011028:Pneumoperitoneum, Artificial / Q000009:adverse effects*; D011312:Pressure / Q000009:adverse effects; D051381:Rats; D017207:Rats, Sprague-Dawley; D015427:Reperfusion Injury / Q000209:etiology* / Q000473:pathology; D001743:Urinary Bladder / Q000378:metabolism* / Q000473:pathology* / Q000503:physiopathology
D008315:Malondialdehyde