Red-Colored Urine in the Cardiac Surgical Patient—Diagnosis, Causes, and Management

Koh, Li Ying; Hwang, Nian Chih

doi:10.1053/j.jvca.2020.10.014

Cited by 3 publications

(2 citation statements)

References 113 publications

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“…Second, it could offer the possibility of extending to new functions or other measurement parameters through the I 2 C BUS, leaving the system open to possible improvements or additions. Third, the device could include colorimetric analysis of urine, which would add value to clinical care [37][38][39][40]. Fourth, it could have varied communication systems, such as WIFI, Bluetooth Low Energy (BLE), and LoRa, to choose from according to individual needs.…”

Section: Prototype Requirementsmentioning

confidence: 99%

Development of a urinometer for automatic measurement of urine flow in catheterized patients

Lafuente,

González,

Puertas

et al. 2023

PLoS ONE

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Urinary flow measurement and colorimetry are vital medical indicators for critically ill patients in intensive care units. However, there is a clinical need for low-cost, continuous urinary flow monitoring devices that can automatically and in real-time measure urine flow. This need led to the development of a non-invasive device that is easy to use and does not require proprietary disposables. The device operates by detecting urine flow using an infrared barrier that returns an unequivocal pattern, and it is capable of measuring the volume of liquid in real-time, storing the history with a precise date, and returning alarms to detect critical trends. The device also has the ability to detect the color of urine, allowing for extended data and detecting problems in catheterized patients such as hematuria. The device is proposed as an automated clinical decision support system that utilizes the concept of the Internet of Medical Things. It works by using a LoRa communication method with the LoRaWAN protocol to maximize the distance to access points, reducing infrastructure costs in massive deployments. The device can send data wirelessly for remote monitoring and allows for the collection of data on a dashboard in a pseudonymous way. Tests conducted on the device using a gold standard medical grade infusion pump and fluid densities within the 1.005 g/ml to 1.030 g/ml urine density range showed that droplets were satisfactorily captured in the range of flows from less than 1 ml/h to 500 ml/h, which are acceptable ranges for urinary flow. Errors ranged below 15%, when compared to the values obtained by the hospital infusion pump used as gold standard. Such values are clinically adequate to detect changes in diuresis patterns, specially at low urine output ranges, related to renal disfunction. Additionally, tests carried out with different color patterns indicate that it detects different colors of urine with a precision in detecting RGB values <5%. In conclusion, the results suggest that the device can be useful in automatically monitoring diuresis and colorimetry in real-time, which can facilitate the work of nursing and provide automatic decision-making support to intensive care physicians.

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Section: Prototype Requirementsmentioning

confidence: 99%

Development of a urinometer for automatic measurement of urine flow in catheterized patients

Lafuente,

González,

Puertas

et al. 2023

PLoS ONE

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show abstract

“…However, none of the measurements are without the withdrawal of blood samples or costs for measurements. On the other hand, red-colored urine may occur in patients during and after CPB, which is often considered a sign of hemolysis [ 13 , 14 ]. Therefore, we hypothesized that quantification of urine color change may be an inexpensive and non-invasive alternative to determine the degree of hemolysis.…”

Section: Introductionmentioning

confidence: 99%

Hemolysis Proceeds Urine Color Change in Patients Undergoing Open-Heart Surgery on Cardiopulmonary Bypass

Takeishi,

Yamamoto,

Sato

et al. 2023

Cureus

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Purpose: Red-colored urine often occurs in patients in the perioperative period who undergo cardiac surgery using cardiopulmonary bypass (CPB). This urine color change has been utilized for approximating hemolysis during CPB without a proven relationship for ongoing hemolysis. This case series study aimed to examine the relationship between plasma free hemoglobin (Hb) levels and quantified measures of urine color. Methods: Ten patients were enrolled in this study. Blood and urine were collected for analyses for the following time points: before surgery, two hours after the initiation of CPB, every 30 min during CPB thereafter, and 0, 2, 4, 12, and 24 hours after the completion of CPB. We measured free Hb in plasma and urine using the azide-methemoglobin method. Photographs of urine were obtained, and the luminance of the three basic colors (red/green/blue) was analyzed by quantitative luminance contrast analysis to find a correlation for hemolysis. Results: Median levels of plasma free Hb were 0.015 (0.010-0.080, n = 10) g/dL at baseline. During the CPB, increases in plasma free Hb levels were measured: median plasma free Hb levels were increased to 0.100 g/dL (0.020-0.240, p = 0.039, vs. baseline, n = 9) at two hours into CPB, median and range, respectively. In contrast, increases in urinary free Hb levels and/or urine color changes were measured only after cessation of CPB in nine patients. Conclusion: Urine color change or elevation of urinary free Hb levels followed the elevation of plasma free Hb levels with considerable delay.

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Barva moči z pohledu klinické fyziologie

Astapenko¹,

Černý²

2022

Anest. intenziv. Med.

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Red-Colored Urine in the Cardiac Surgical Patient—Diagnosis, Causes, and Management

Cited by 3 publications

References 113 publications

Development of a urinometer for automatic measurement of urine flow in catheterized patients

Development of a urinometer for automatic measurement of urine flow in catheterized patients

Hemolysis Proceeds Urine Color Change in Patients Undergoing Open-Heart Surgery on Cardiopulmonary Bypass

Barva moči z pohledu klinické fyziologie

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