scholarly journals Modulation of Bladder Wall Micromotions Alters Intravesical Pressure Activity in the Isolated Bladder

2019 ◽  
Vol 9 ◽  
Author(s):  
Basu Chakrabarty ◽  
Dominika A. Bijos ◽  
Bahareh Vahabi ◽  
Francesco Clavica ◽  
Anthony J. Kanai ◽  
...  
Keyword(s):  
Bladder Wall ◽  
Intravesical Pressure

Mechanoreceptor afferent activity compared with receptor field dimensions and pressure changes in feline urinary bladder

1992 ◽  
Vol 70 (11) ◽  
pp. 1457-1467 ◽  
Author(s):  
John W. Downie ◽  
J. Andrew Armour
Keyword(s):  
Contractile Activity ◽  
Bladder Wall ◽  
Afferent Activity ◽  
Intravesical Pressure ◽  
Receptor Field ◽  
Precise Relationship ◽  
Pressure Changes ◽  
The Relationship ◽  
Simple Fashion ◽  
Pressure Receptor

The relationship between vesical mechanoreceptor field dimensions and afferent nerve activity recorded in pelvic plexus nerve filaments was examined in chloralose-anesthetized cats. Orthogonal receptor field dimensions were monitored with piezoelectric ultrasonic crystals. Reflexly generated bladder contractile activity made measurements difficult, therefore data were collected from cats subjected to actual sacral rhizotomy. Afferent activity was episodic and was initiated at different pressure and receptor field dimension thresholds. Maximum afferent activity did not correlate with maximum volume or pressure. Furthermore, activity was not linearly related to intravesical pressure, receptor field dimensions, or calculated wall tension. Pressure–length hysteresis of the receptor fields occurred. The responses of identified afferent units and their associated receptor field dimensions to brief contractions elicited by the ganglion stimulant 1,1-dimethyl-4-phenylpiperazinium iodide (2.5–20 μg i.a.), studied under constant volume or constant pressure conditions, are compatible with bladder mechanoreceptors behaving as tension receptors. Because activity generated by bladder mechanoreceptors did not correlate in a simple fashion with intravesical pressure or receptor field dimensions, it is concluded that such receptors are influenced by the viscoelastic properties of the bladder wall. Furthermore, as a result of the heterogeneity of the bladder wall, receptor field tension appears to offer a more precise relationship with the activity of bladder wall mechanoreceptors than does intravesical pressure.Key words: bladder distension, intravesical pressure, sacral rhizotomy, viscoelasticity.

scholarly journals X-ray videocystometry for high-speed monitoring of urinary tract function in mice

2021 ◽  
Vol 7 (30) ◽  
pp. eabi6821
Author(s):  
Jan Franken ◽  
Helene De Bruyn ◽  
Roma Rietjens ◽  
Andrei Segal ◽  
Dirk De Ridder ◽  
...  
Keyword(s):  
Urinary Tract ◽  
High Speed ◽  
Molecular Mechanisms ◽  
Bladder Wall ◽  
Acute Effect ◽  
Lower Urinary Tract Dysfunction ◽  
Intravesical Pressure ◽  
Medical Need ◽  
Tract Function ◽  
Urine Storage

Lower urinary tract dysfunction (LUTd) represents a major health care problem with a high, unmet medical need. Design of additional therapies for LUTd requires precise tools to study bladder storage and voiding (dys)function in animal models. We developed videocystometry in mice, combining intravesical pressure measurements with high-speed fluoroscopy of the urinary tract. Videocystometry substantially outperforms current state-of-the-art methods to monitor the urine storage and voiding process, by enabling quantitative analysis of voiding efficiency, urethral flow, vesicoureteral reflux, and the relation between intravesical pressure and flow, in both anesthetized and awake, nonrestrained mice. Using videocystometry, we identified localized bladder wall micromotions correlated with different states of the filling/voiding cycle, revealed an acute effect of TRPV1 channel activation on voiding efficiency, and pinpointed the effects of urethane anesthesia on urine storage and urethral flow. Videocystometry has broad applications, ranging from the elucidation of molecular mechanisms of bladder control to drug development for LUTd.

scholarly journals Spatiotemporal analysis of spontaneous myogenic contractions in the urinary bladder of the rabbit: timing and patterns reflect reported electrophysiology

2017 ◽  
Vol 313 (3) ◽  
pp. F687-F698 ◽  
Author(s):  
C. M. Hulls ◽  
R. G. Lentle ◽  
Q. M. King ◽  
G. W. Reynolds ◽  
J. P. Chambers
Keyword(s):  
Urinary Bladder ◽  
Ex Vivo ◽  
Bladder Wall ◽  
Vertical Axis ◽  
Spatiotemporal Analysis ◽  
Cyclic Variation ◽  
Intravesical Pressure ◽  
Maximum Area ◽  
Linear Maps ◽  
Propagating Contractions

The dynamics of propagating myogenic contractions in the wall of the resting ex vivo urinary bladder of the rabbit were characterized by spatiotemporal maps and related to cyclic variation in intravesical pressure (Pves). Patches of propagating contractions (PPCs) enlarged and involuted in near synchrony with peaks in Pves [mean 3.85  ± 0.3 cycles per minute (cpm)] and were preceded by regions of stretch. The maximum area of the bladder undergoing contraction (55.28 ± 2.65%) and the sizes of individual PPCs (42.61 ± 1.65 mm2) coincided with the peak in Pves. PPCs originated and propagated within temporary patch domains (TPDs) and comprised groups of nearly synchronous cyclic propagating individual contractions (PICs). The TPDs were located principally along the vertical axis of the anterior surface of the bladder. The sites of origin of PICs within PPCs were inconsistent, consecutive contractions often propagating in opposite directions along linear maps of strain rate. Similar patterns of movement occurred in areas of the anterior bladder wall that had been stripped of mucosa. Pves varied cyclically with area of contraction and with the indices of aggregation of PPCs, indicating that they grew by peripheral enlargement and collision without annihilation. The synchronization of PICs within PPCs was sometimes lost, uncoordinated PICs then occurring irregularly (between 4 and 20 cpm) having little effect on Pves. We postulate that the formation and involution of PPCs within a TPD resulted from cyclic variation in excitation that increased the incidence and distance over which component PICs propagated.

Impact of Bladder Wall Thickness on the Outcomes of Antimuscarinic Treatment in Women with Overactive Bladder

2021 ◽  
pp. 1-7
Author(s):  
Sherif Salah Azab ◽  
Omar El Sayed ◽  
Mona El Kafoury
Keyword(s):  
Overactive Bladder ◽  
Wall Thickness ◽  
Bladder Wall ◽  
Bladder Volume ◽  
Transabdominal Ultrasound ◽  
Intravesical Pressure ◽  
Oral Tablet ◽  
Bladder Wall Thickness ◽  
Group 2 ◽  
Group 1

<b><i>Aim:</i></b> This study aimed to evaluate the effect of bladder wall thickness (BWT) (using transabdominal ultrasound) on the outcomes of antimuscarinic treatment in women with overactive bladder. <b><i>Methods:</i></b> A total of 102 female patients with symptoms of OAB were recruited. All patients completed the Overactive Bladder version 8 (OAB-V8) (Arabic validation) and the International Consultation of Incontinence Questionnaire (ICIQ-SF). Patients completed the urodynamic study (UDS) including uroflowmetry and PVR and measures of BWT by transabdominal ultrasound. The patients were classified into 2 major groups: G1 (patients with BWT &#x3c;5 mm) and G2 (patients with BWT ≥5 mm). The patients were re-evaluated after 3-month medication with solifenacin 10-mg oral tablet. <b><i>Results:</i></b> At baseline, the results of OAB-V8 and ICIQ-SF were significantly higher in G2 than G1 (<i>p</i> &#x3c; 0.001). Regarding UDS, volume at 1st desire to void, volume at strong desire to void, and MBC were significantly higher in group 1 compared to group 2 (<i>p</i> = 0.001). Intravesical pressure at strong desire and patients’ number of DO were significantly increased in G2 (<i>p</i> &#x3c; 0.05 and <i>p</i> = 0.001, respectively). After treatment, there was an improvement in both groups regarding OAB-V8, ICIQ-SF, bladder volume at 1st desire to void, bladder volume at strong desire to void, bladder volume at DO, MBC, intravesical pressure at strong desire, and the patients’ number with DO (decreased), and these improvements were statistically significant in group 1 compared to group 2 (<i>p</i> &#x3c; 0.05). <b><i>Conclusion:</i></b> BWT showed a significant association with both OAB symptom scores and UDS parameters. The decrease in BWT is associated with a significantly higher response to solifenacin therapy regarding the UDS results.

scholarly journals The Integrative Physiology of the Bladder

2007 ◽  
Vol 89 (6) ◽  
pp. 580-585 ◽  
Author(s):  
Marcus John Drake
Keyword(s):  
Bladder Wall ◽  
Cell Types ◽  
Bladder Function ◽  
Intravesical Pressure ◽  
Detrusor Contraction ◽  
Integrative Physiology ◽  
Physiological Conditions ◽  
Normal Bladder ◽  
Bladder Fullness ◽  
Lower Urinary

Normal bladder function is complex, resulting from the co-operative interaction of numerous regulatory cell types, of which the interstitial cells and the peripheral neurones are particularly interesting. Collectively, these comprise the myovesical plexus, which appears to confer structural and functional characteristics on the bladder loosely akin to those of the gut. These include functional modularity, which gives rise to the potential for localised and propagating peristalsis-like movements in the bladder wall according to the prevailing physiological conditions. Localised modular activity during filling may contribute to normal generation of sensation and exaggerated modular activity may give rise to urinary urgency. Enhanced co-ordination of modular activity occurs in various models of detrusor overactivity; it leads to surges of contraction over a large part of the bladder wall, generating phasic changes in intravesical pressure. During voiding, the myovesical plexus sustains detrusor contraction at the behest of the brainstem, monitoring state of bladder fullness as it does so, as a guide to the required duration for which it has to keep up the effort. Accordingly, the bladder wall itself may house structures which render the bladder the effector level in a hierarchy of lower urinary tract regulation. Dysfunction in these vital regulatory structures is an underestimated factor in the pathophysiology of clinical bladder problems.

Swim bladder mycosis in farmed rainbow trout Oncorhynchus mykiss caused by Phoma herbarum and experimental verification of pathogenicity

2020 ◽  
Vol 138 ◽  
pp. 237-246 ◽  
Author(s):  
J Řehulka ◽  
A Kubátová ◽  
V Hubka
Keyword(s):  
Rainbow Trout ◽  
Histopathological Examination ◽  
Periodic Acid ◽  
Bladder Wall ◽  
Swim Bladder ◽  
Cell Reactivity ◽  
Periodic Acid Schiff ◽  
Posterior Portion ◽  
Hepatic Congestion ◽  
Phoma Herbarum

In this study, spontaneous swim bladder mycosis was documented in a farmed fingerling rainbow trout from a raceway culture system. At necropsy, the gross lesions included a thickened swim bladder wall, and the posterior portion of the swim bladder was enlarged due to massive hyperplasia of muscle. A microscopic wet mount examination of the swim bladder contents revealed abundant septate hyphae, and histopathological examination showed periodic acid-Schiff-positive mycelia in the lumen and wall of the swim bladder. Histopathological examination of the thickened posterior swim bladder revealed muscle hyperplasia with expansion by inflammatory cells. The causative agent was identified as Phoma herbarum through morphological analysis and DNA sequencing. The disease was reproduced in rainbow trout fingerlings using intraperitoneal injection of a spore suspension. Necropsy in dead and moribund fish revealed extensive congestion and haemorrhages in the serosa of visceral organs and in liver and abdominal serosanguinous fluid. Histopathological examination showed severe hepatic congestion, sinusoidal dilatation, Kupffer cell reactivity, leukostasis and degenerative changes. Fungi were disseminated to the liver, pyloric caeca, kidney, spleen and heart. Although infections caused by Phoma spp. have been repeatedly reported in fish, species identification has been hampered by extensive taxonomic changes. The results of this study confirmed the pathogenicity of P. herbarum in salmonids by using a reliably identified strain during experimental fish infection and provides new knowledge regarding the course of infection.

CLINICAL SYMPTOMS, ULTRASOUND AND HISTOPATHOLOGY OF TUMORLIKE LESIONS OF THE BLADDER.

2017 ◽  
pp. 41-46
Author(s):  
Van Mao Nguyen ◽  
Thi Bich Chi Nguyen
Keyword(s):  
Bladder Cancer ◽  
Bladder Tumor ◽  
Clinical Symptoms ◽  
Bladder Wall ◽  
Lower Abdominal Pain ◽  
University Hospital ◽  
Wall Thickening ◽  
Health Examination ◽  
Ultrasound Images ◽  
Key Words Bladder Cancer

Background: Bladder cancer is one of the most frequent type of urinary cancer which has been ever increasing. For the better treatment, the early discovery and definite diagnosis of this disease played an important role. Objective: To describe some clinical symptoms and ultrasound features of tumorlike lesions of the bladder. To diagnose and classify the histopathology of tumorlike lesions of the bladder. Materials, method: cross - sectional study on 64 cases in Hue University Hospital and Hue central hospital from April, 2016 to February, 2017. Results: Hematuria was the most common reason that patients went to hospital (79.7%). Lower abdominal pain and irritation during urination accounting for 9.4% and 6.2% respectively. Only 3 patients with bladder cancer were accidentally discovered through periodic health examination (4.7%). The characteristics of hematuria in bladder tumor was flesh red urine (62.5%) and total hematuria (60.7%). With ultrasonography, the results of 64 patients were divided in 3 groups as follow: bladder tumor, which was the highest rate 87.5%, bladder polyp was 3.1% and focal bladder wall thickening was 9.4%. Of which, the vast majority of these ultrasound images was tumor - like lesions protruding in the lumen of the bladder (75%), the rest was wall thickening lesions (25%). Tumors were different in size, the biggest tumor was 7cm in diameter and the smallest was 0.6cm. Those with the diameter 3cm or bigger accounting for 42.2%, the smaller was 57.8%. Most cases have only one lesion (62.5%) and at lateral wall (46.6%). Histopathologically, cancer was 59/64 case (92.2%): urothelial carcinoma was 98.3 %, squamous cell carcinomawas 1.7% and 5 cases (7.8%) were benign. Most cancerous cases were poorly differentiated, grade II (50.9%) and grade III (32.2%). The stage T1NxMx was 20.3% and worse than T2MxNx was 79.7%. Conclusion: hematuria was the most popular symptom, suggesting bladder cancer. Clinical diagnosing bladder cancer was not high sensitive (61.01%). Ultrasound could detect bladder tumor with high sensitive (89.8%). These patients also needed histopathology classification to diagnose and finally choose the best method for the appropriate treatment. Key words: bladder cancer, histopathology, ultrasound, uroepithelial carcinoma, hematuria

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