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Do W, Russell R, Wheeler C, Lockwood M, De Vos M, Pavord I, Bafadhel M. Performance of Contactless Respiratory Rate Monitoring by Albus Home TM, an Automated System for Nocturnal Monitoring at Home: A Validation Study. Sensors (Basel) 2022; 22:s22197142. [PMID: 36236241 PMCID: PMC9573065 DOI: 10.3390/s22197142] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/09/2022] [Revised: 09/01/2022] [Accepted: 09/16/2022] [Indexed: 06/12/2023]
Abstract
Respiratory rate (RR) is a clinically important predictor of cardio-respiratory deteriorations. The mainstay of clinical measurement comprises the manual counting of chest movements, which is variable between clinicians and limited to sporadic readings. Emerging solutions are limited by poor adherence and acceptability or are not clinically validated. Albus HomeTM is a contactless and automated bedside system for nocturnal respiratory monitoring that overcomes these limitations. This study aimed to validate the accuracy of Albus Home compared to gold standards in real-world sleeping environments. Participants undertook overnight monitoring simultaneously using Albus Home and gold-standard polygraphy with thoraco-abdominal respiratory effort belts (SomnomedicsEU). Reference RR readings were obtained by clinician-count of polygraphy data. For both the Albus system and reference, RRs were measured in 30-s segments, reported as breaths/minute, and compared. Accuracy was defined as the percentage of RRs from the Albus system within ±2 breaths/minute of reference counts. Across a diverse validation set of 32 participants, the mean accuracy exceeded 98% and was maintained across different participant characteristics. In a Bland-Altman analysis, Albus RRs had strong agreement with reference mean differences and the limits of agreement of -0.4 and ±1.2 breaths/minute, respectively. Albus Home is a contactless yet accurate system for automated respiratory monitoring. Validated against gold -standard methods, it enables long-term, reliable nocturnal monitoring without patient burden.
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Affiliation(s)
| | - Richard Russell
- Respiratory Medicine Unit, Nuffield Department of Medicine, University of Oxford, Oxford OX3 7FZ, UK
| | | | | | - Maarten De Vos
- Department of Electrical Engineering and Department of Development and Regeneration, KU Leuven, 3000 Leuven, Belgium
| | - Ian Pavord
- Respiratory Medicine Unit, Nuffield Department of Medicine, University of Oxford, Oxford OX3 7FZ, UK
| | - Mona Bafadhel
- King’s Centre for Lung Health, School of Immunology and Microbial Sciences, Faculty of Life Sciences and Medicine, King’s College London, London SE1 1UL, UK
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Do W, Russell R, Wheeler C, Javed H, Dogan C, Cunningham G, Khanna V, De Vos M, Satia I, Bafadhel M, Pavord I. Performance of cough monitoring by Albus Home™, a contactless and automated system for nocturnal respiratory monitoring at home. ERJ Open Res 2022; 8:00265-2022. [DOI: 10.1183/23120541.00265-2022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2022] [Accepted: 08/08/2022] [Indexed: 11/05/2022] Open
Abstract
IntroductionObjective cough frequency is a key clinical endpoint but existing wearable monitors are limited to 24-h recordings. Albus Home uses contactless motion, acoustic and environmental sensors to monitor multiple metrics, including respiratory rate and cough without encroaching on patient lifestyle. The aim of this study was to evaluate measurement characteristics of nocturnal cough monitoring by Albus Home compared to manual counts.MethodsAdults with respiratory conditions underwent overnight monitoring using Albus Home in their usual bedroom environments. Participants set-up the plug-and-play device themselves. For reference counts, each audio recording was counted by two annotators, and cough defined as explosive phases audio-visually labelled by both. In parallel, recordings were processed by a proprietary Albus system, comprising a deep-learning algorithm with a human screening step for verifying or excluding occasional events that mimic cough. Performance of the Albus system in detecting individual cough events and reporting hourly cough counts was compared against reference counts.Results30 nights from 10 subjects comprised 375 h(h) of recording. Mean (s.d.) coughs/night were 90 (76). Coughs·h−1 ranged from 0 to 129. Albus counts were accurate across hours with high and low cough frequencies, with median sensitivity, specificity, positive-predictive-value, negative-predictive-values of 94.8,100.0,99.1, and 100.0% respectively. Agreement between Albus and reference was strong (Intra-class Correlation Coefficient[ICC] 0.99; 95%CI 0.99-0.99; p<0.001) and equivalent to agreement between observers and reference counts (ICC 0.98, 0.99 respectively).ConclusionsAlbus Home provides a unique, contactless and accurate system for cough monitoring, enabling collection of high-quality and potentially clinically relevant longitudinal data.
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Do W, Elzerman T, de Bree R, Rosenberg A, Forouzanfar T, Van Cann EM. Is low or high body mass index in patients operated for oral squamous cell carcinoma associated with the perioperative complication rate? Int J Oral Maxillofac Surg 2020; 50:591-597. [PMID: 32861557 DOI: 10.1016/j.ijom.2020.07.023] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2019] [Revised: 05/25/2020] [Accepted: 07/22/2020] [Indexed: 10/23/2022]
Abstract
The aim of this study was to analyse the effect of body mass index (BMI), both low and high values, on the perioperative complication rate in patients with oral squamous cell carcinoma (OSCC). The medical records of 259 patients operated between 2014 and 2017 for OSCC were reviewed. Univariate and multivariate analyses were performed. Sixty of the 259 patients developed 87 complications. Low or high BMI was not associated with the perioperative complication rate. A longer operating time and increased blood loss were associated with a higher perioperative complication rate and higher Clavien-Dindo grade. Low BMI, American Society of Anesthesiologists score 2 and 3, a longer operating time, and increased blood loss were associated with a longer hospital stay. Low BMI was associated with a longer hospital stay. Neither low nor high BMI was associated with the perioperative complication rate. A longer operating time and increased blood loss were associated with a higher perioperative complication rate and higher Clavien-Dindo grade.
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Affiliation(s)
- W Do
- Department of Head and Neck Surgical Oncology, UMC Utrecht Cancer Center, University Medical Center Utrecht, Utrecht, the Netherlands; Department of Oral and Maxillofacial Surgery/Oral Pathology, VU University Medical Center/Academic Center for Dentistry Amsterdam (ACTA), Amsterdam, the Netherlands; Department of Oral and Maxillofacial Surgery and Special Dental Care, University Medical Center Utrecht, the Netherlands
| | - T Elzerman
- Department of Head and Neck Surgical Oncology, UMC Utrecht Cancer Center, University Medical Center Utrecht, Utrecht, the Netherlands; Department of Oral and Maxillofacial Surgery/Oral Pathology, VU University Medical Center/Academic Center for Dentistry Amsterdam (ACTA), Amsterdam, the Netherlands; Department of Oral and Maxillofacial Surgery and Special Dental Care, University Medical Center Utrecht, the Netherlands
| | - R de Bree
- Department of Head and Neck Surgical Oncology, UMC Utrecht Cancer Center, University Medical Center Utrecht, Utrecht, the Netherlands
| | - A Rosenberg
- Department of Oral and Maxillofacial Surgery and Special Dental Care, University Medical Center Utrecht, the Netherlands
| | - T Forouzanfar
- Department of Oral and Maxillofacial Surgery/Oral Pathology, VU University Medical Center/Academic Center for Dentistry Amsterdam (ACTA), Amsterdam, the Netherlands
| | - E M Van Cann
- Department of Head and Neck Surgical Oncology, UMC Utrecht Cancer Center, University Medical Center Utrecht, Utrecht, the Netherlands; Department of Oral and Maxillofacial Surgery/Oral Pathology, VU University Medical Center/Academic Center for Dentistry Amsterdam (ACTA), Amsterdam, the Netherlands; Department of Oral and Maxillofacial Surgery and Special Dental Care, University Medical Center Utrecht, the Netherlands.
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Yang Y, Kim KY, Hwang I, Yim T, Do W, Kim MJ, Lee S, Jung HY, Choi JY, Park SH, Kim YL, Kim CD, Cho JH. Cystatin C-Based Equation for Predicting the Glomerular Filtration Rate in Kidney Transplant Recipients. Transplant Proc 2018; 49:1018-1022. [PMID: 28583518 DOI: 10.1016/j.transproceed.2017.03.050] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
BACKGROUND Precise monitoring of the glomerular filtration rate (GFR) is needed to estimate the allograft function in kidney transplant recipients (KTRs). The GFR is widely estimated with the use of formulas based on serum cystatin C (SCys) and serum creatinine (SCr) levels. We compared the efficacy of SCys-based equations with that of SCr-based equations to predict the allograft function. METHODS We calculated the Modification of Diet in Renal Disease (MDRD), Chronic Kidney Disease Epidemiology Collaboration (CKD-EPI Cr), CKD-EPI creatinine-cystatin C (CKD-EPI Cr/Cys), and CKD-EPI cystatin C (CKD-EP ICys) equations in 70 KTRs. The measured GFR (mGFR) was defined as the GFR estimated by technetium-99m-diethylene triamine pentaacetic acid (99mTc-DTPA) clearance. The accuracy and precision of the equations were compared with the mGFR. The performance characteristics of SCr and SCys were analyzed with the use of receiver operating characteristic (ROC) curves to ascertain the sensitivity and specificity at the cutoff value of <45 mL/min/1.73 m2 DTPA. RESULTS Overall, MDRD and CKD-EPICys did not show significant differences from mGFR (P = .05 and P = .077, respectively), whereas CKD-EPI Cr and CKD-EPI Cr/Cys significantly underestimated mGFR (P < .001 and P = .005, respectively). In the subgroup of patients with mGFR <45 mL/min/1.73 m2, CKD-EPI Cys showed little bias (P = .122), whereas MDRD significantly underestimated mGFR (P = .037). The area under the ROC curve for predicting mGFR <45 mL/min/1.73 m2 was 0.80 for SCys, which was better than that for SCr at 0.763. CONCLUSIONS Cystatin C-based equations showed better predictive performance of the allograft function than creatinine-based equations for the KTRs, including patients with lower GFR. Cystatin C level might be a good alternate measurement to monitor the allograft function.
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Affiliation(s)
- Y Yang
- Department of Internal Medicine, Kyungpook National University Hospital, Daegu, Korea
| | - K Y Kim
- Department of Internal Medicine, Kyungpook National University Hospital, Daegu, Korea
| | - I Hwang
- Department of Internal Medicine, Kyungpook National University Hospital, Daegu, Korea
| | - T Yim
- Department of Internal Medicine, Kyungpook National University Hospital, Daegu, Korea
| | - W Do
- Department of Internal Medicine, Kyungpook National University Hospital, Daegu, Korea
| | - M J Kim
- Department of Internal Medicine, Kyungpook National University Hospital, Daegu, Korea
| | - S Lee
- Department of Internal Medicine, Kyungpook National University Hospital, Daegu, Korea
| | - H-Y Jung
- Department of Internal Medicine, Kyungpook National University Hospital, Daegu, Korea
| | - J-Y Choi
- Department of Internal Medicine, Kyungpook National University Hospital, Daegu, Korea
| | - S-H Park
- Department of Internal Medicine, Kyungpook National University Hospital, Daegu, Korea
| | - Y-L Kim
- Department of Internal Medicine, Kyungpook National University Hospital, Daegu, Korea
| | - C-D Kim
- Department of Internal Medicine, Kyungpook National University Hospital, Daegu, Korea
| | - J-H Cho
- Department of Internal Medicine, Kyungpook National University Hospital, Daegu, Korea.
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