Forward-Looking Ultrasound Wearable Scanner System for Estimation of Urinary Bladder Volume.
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ABSTRACT:
SUBMITTER: Jo HG
PROVIDER: S-EPMC8400094 | biostudies-literature |
REPOSITORIES: biostudies-literature
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Project description:In addition to being suitable for the assessment of residual urine volume, the use of a portable bladder scanner can also assist medical staff in developing a reasonable urination plan. Portable scanners can help medical personnel to estimate the height and/or relaxation of the bladder neck for pelvic floor muscle training, assist in the efficacy evaluation of muscarinic antagonists in patients with neurogenic detrusor overactivity, and even determine whether the urine in the bladder of pediatric patients meets the criteria for catheterization to obtain urine samples. However, in the case described herein, we encountered abnormal deviation between the data measured by a portal bladder scanner and actual catheterization. The patient was a 65-year-old male suffering spinal nerve dysfunction due to tuberculous meningitis. He had functional dysuria and a history of liver cirrhosis, accompanied by a large amount of ascites. We therefore deduced that the deviation in the scanning data was attributable to the ascites. After the patient's ascites had resolved, the residual urine volume obtained via scanning evaluation was comparable to that obtained through catheterization. Our case shows that in the event of abnormal deviation in portable bladder scanner measurements, clinical judgements should be made based on the patient's condition rather than the scanning results alone.
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Project description:BackgroundAlthough point-of-care volumetric assessments of the urinary bladder are not routinely performed in dogs, urine volume quantification can provide important clinical information including noninvasive urine output estimation.Hypothesis/objectiveUse of 3-dimensional (3D) ultrasound for determination of urinary bladder volume (UBV) in dogs will be accurate for different bladder volumes and will decrease the need for operator skill in measuring UBV compared to 2-dimensional (2D) ultrasound evaluation.AnimalsTen laboratory-bred Beagle dogs.MethodsProspective, experimental study. Urinary bladders were infused with a calculated amount of sterile saline to represent small, medium, and large volumes. Each UBV was estimated and calculated by a board-certified veterinary radiologist using 3 different 2D ultrasound formulas followed by use of a 3D ultrasound device by a novice. Measured UBVs were compared to the instilled UBV for both 2D and 3D ultrasound methods. Time from start to end of examination was recorded for both ultrasound methods in a subset of dogs.ResultsThe 3D ultrasound device underestimated UBV with a mean difference of -9.8 mL compared with 2D ultrasound that overestimated UBV with a difference of +4.2 to 20.3 mL dependent on the 2D formula used. The 3D ultrasound method took less time to measure UBV (mean of 80 seconds per measurement) compared to the 2D method (165 seconds per measurement; P = .02).Conclusions and clinical importanceThe tested 3D ultrasound device was found to be an accurate and rapid point-of-care tool for measuring UBV in dogs, providing a noninvasive method to estimate bladder volume in real time.
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Project description:PurposeThis study examined the performance of a bladder volume measuring device, the BladderScan (BS) BVI9400. The use of the BS offers the possibility of assessing the bladder volume before positioning the patient and performing the daily image-guided radiotherapy procedure. Patients often cannot lie down before entering the treatment vault. Therefore, the BS was also assessed in a standing position.MethodsThe repeatability precision was first evaluated, which is the variability of immediate repeated measures of the BS with same operator and subject. This was followed by the reproducibility precision of the BS in which the operator and subjects differ. Finally, the trueness was evaluated in terms of fixed and proportional bias of the results by applying weighted least-squares fitting. Note that 53 and 85 patient measurements were carried out in supine and standing position, respectively, each consisting of three repeated BS measurements. These were compared with the computed tomography (CT)-delineated bladder volume.ResultsRepeatability was dependent on measurement value (heteroscedasticity) with σrepeatability (BS) = ±15 cm3 ± 10%. However, the total agreement between BS and CT was low with the 95% limits of agreement (LOAs) exceeding ±200 cm3 due to poor patient reproducibility and presence of fixed and proportional bias. Only in the best case of male patients in the supine position, three BS measurements, and correction for the fixed and proportional bias, 95% LOAs of [-147, +114] cm3 were obtained between CT and BS.ConclusionThe agreement of the BVI9400 BS with CT was found to be too low for radiotherapy applications.
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