Applications of Bladder Ultrasonography. I. Bladder Content and Residue

Orgaz, R Espuela; Gómez, Armando Zuluaga; Ramírez, César; Torres, Jose

doi:10.1016/s0022-5347(17)54952-6

Cited by 43 publications

(2 citation statements)

References 6 publications

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“…Different correction coefficients can be used to define the bladder volume as a cuboid (F=0.89), sphere (F=0.52), ellipsoid cylinder (F=0.79), triangular prism (F=0.50) [93], [94], [95], [96], [97], [98], [99], [100], [101]. Bih et al proposed an optimal correction coefficient of 0.72 as a result of linear regression analysis, leading to a mean volume estimation error of 17.4%±11.6% [102].…”

Section: ) Ultrasound Imagingmentioning

confidence: 99%

Bladder Monitoring Systems: State of the Art and Future Perspectives

2022

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The lower urinary tract (LUT) is sensitive to nervous system pathologies, injuries and dysfunctions that may lead to the loss or reduction of bladder fullness sensation. Urination assistive devices aimed at supporting bladder emptying and continence control have been proposed so far. However, patients may not perceive the urge to urinate and activate the device accordingly. In this framework, bladder pressure and volume monitoring is crucial and would lead to optimize the use of assistive devices and reduce side effects for the patient. Despite its centrality in restoring LUT functions, urinary bladder monitoring remains not fully explored, yet. In this review paper, we summarize the efforts performed at the clinical and research level towards efficient bladder monitoring. The analysis of the current state of the art enabled to identify the challenges of the field and to draw potential future directions in LUT dysfunction management by engineering solutions. After the introduction of technologies to support urination, a major focus is placed on three groups of monitoring devices, that is, instruments for a clinical setting, wearable devices for continuous and domestic monitoring, and implantable sensors for chronic monitoring. Finally, the main challenges are identified and discussed, highlighting the most crucial points and the main treatment opportunities.INDEX TERMS Bladder pressure monitoring, bladder volume monitoring, implantable biorobotic organs, implantable sensors, urinary dysfunctions. FIGURE 3. Examples of clinical imaging instruments to monitor the urinary bladder. Ultrasound-based volume reconstruction systems (Bladder Scan BVI 9400 [253]) through (a) 2D and (b) 3D methods [102], Copyright 1998, Published by Elsevier Inc., [105]. Bioimpedance tomography device employed for EIT [132], Copyright 2016, Taiwanese Society of Biomedical Engineering, with 16 electrodes arranged along different configurations for bladder volume reconstruction and imaging [128], ((c) EIT electrodes [254], Copyright 2020, IEEE). NIRS method exploiting water or oxyhemoglobin as chromophores and detecting light absorption variations during the filling-voiding cycles (d) [142], Copyright 2018, IEEE, and NIRS device [255]. MRI (picture of Michal Jarmoluk from Pixabay): Cavalieri method to compute the volume (e) [153], and representation of a commercial scanner.

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Section: ) Ultrasound Imagingmentioning

confidence: 99%

Bladder Monitoring Systems: State of the Art and Future Perspectives

2022

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“…The use of ultrasound techniques to assess bladder volumes 9–11 has been investigated in the non‐pregnant patient, 11–15 in the postpartum state 2,4,16 and in animal experiments 3,17 . Several other methods have also been described, which use ultrasound to measure urine volume in the bladder 10–29 . Some of these studies have demonstrated a high correlation between sonographic estimation of bladder volumes and catheterised volumes 13 .…”

Section: Introductionmentioning

confidence: 99%

Intrapartum ultrasound estimation of total bladder volume

Gyampoh

Crouch

O’Brien

et al. 2004

BJOG

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Objective To determine whether real-time ultrasound measurement of multiple linear dimensions of the bladder could be used to estimate total bladder volumes of women in labour. Aim To create a simple reproducible formula using ultrasound techniques to help estimate total bladder volumes of women in labour. This may prevent unnecessary catheterisation and conversely, avoid failure to catheterise when indicated, thereby reducing the complications associated with catheterisation and bladder overdistension. Design Prospective, observational study of women in labour.Setting Delivery Suite, Obstetric Hospital, University College London Hospitals.Population Forty-nine women in labour recommended for catheterisation by their attending midwives.Method A real-time ultrasound scanner was used to measure bladder diameters in two planes: transverse width and height, and sagittal width and height. A Foley's catheter was inserted and the bladder drained into a graduated bowl under sterile conditions. These values and urine volumes were recorded and a formula for detecting bladder volumes above 300 mL was developed using linear regression methods and the BlandAltman limits of agreement. Main outcome measure Sensitivity and specificity of derived formulae in predicting bladder volume from ultrasound measurements. Correctly predicted volumes greater than 300 mL. Results Among the 49 women, 36 were nulliparous and 13 were multiparous. All had full-term pregnancies with cephalic presentation and were in active labour with cervical dilatations ranging from 3 to 10 cm. There were no previous caesarean sections among the multiparous women. Thirty-nine women had epidural analgesia. Indications for catheterisation included a palpable bladder per abdomen, or the interval from last urine voided. The catheterised volumes ranged from 30 to 720 mL with a median of 150 mL. The new equation (0.68 Â h Â d Â w) had a sensitivity of 77% (95% CI 46 -95%) and specificity of 86% (95% CI 71 -95%) for detecting bladder volumes greater than 300 mL. In order to ensure that about 95% of women in need of catheterisation are detected, the above equation was improved using the Bland -Altman limits of agreement. The sensitivity of this final equation (1.74 Â h Â d Â w) was 100% (95% CI 75 -100%) and the specificity dropped to 36% (95% CI 21 -54%). Conclusion It is possible to use real-time ultrasound in estimation of total bladder volumes of women in labour. The implications are that all of those normally selected as being in need of catheterisation could be detected, while about a quarter of those women would avoid unnecessary catheterisation.

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