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Song YH. Aneroid Auscultatory Sphygmomanometers and Automated Oscillometric Devices as Mercury-Free Alternatives in Children. Korean Circ J 2024; 54:288-290. [PMID: 38767341 PMCID: PMC11109841 DOI: 10.4070/kcj.2024.0115] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2024] [Accepted: 05/02/2024] [Indexed: 05/22/2024] Open
Affiliation(s)
- Young Hwan Song
- Department of Pediatrics, Seoul National University Bundang Hospital, Seongnam, Korea.
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2
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Derendinger FC, Vischer AS, Krisai P, Socrates T, Schumacher C, Mayr M, Burkard T. Ability of a 24-h ambulatory cuffless blood pressure monitoring device to track blood pressure changes in clinical practice. J Hypertens 2024; 42:662-671. [PMID: 38288945 PMCID: PMC10906216 DOI: 10.1097/hjh.0000000000003667] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2023] [Revised: 12/19/2023] [Accepted: 01/07/2024] [Indexed: 03/03/2024]
Abstract
OBJECTIVE There is an increasing number of cuffless blood pressure (BP) measurement (BPM) devices. Despite promising results when comparing single measurements, the ability of these devices to track changes in BP levels over 24 h related to an initial calibration BP (CalibBP) is unknown. Our aim was to analyse this ability in a cuffless device using pulse transit time. METHODS We prospectively enrolled 166 participants for simultaneously performed cuffless (Somnotouch-NIBP) and cuff-based (Spacelabs 90217A/IEM Mobil-O-graph) 24 h BPM. As CalibBP for the cuffless device, first cuff-based BP was used. As surrogate for changes in BP levels after the CalibBP, we used the difference between the CalibBP and mean 24 h, awake and asleep BP measured by the two devices. In addition, we analysed the relationship between the difference of the CalibBP and the cuff-based BPM versus the difference between the cuff-based and the cuffless BPM devices. RESULTS Mean(SD) difference between the CalibBP and mean 24hBP by the cuff-based or cuffless BP device were 7.4 (13.2) versus 1.8 (8.3) mmHg for systolic ( P < 0.0001) and 6.6 (6.8) versus 1.6 (5.8) mmHg for diastolic ( P < 0.0001). A near linear relationship was seen among the difference between the CalibBP and the cuff-based BPM values and the difference between the cuff-based and cuffless BPM device. CONCLUSION Our data indicate a lower ability of the cuffless BPM device to track changes of BP levels after CalibBP. In addition, cuffless device accuracy was associated with the changes in BP levels after the initial CalibBP - the larger the BP level change, the larger the difference between the devices. REGISTRATION https://www.clinicaltrials.gov ; Unique identifier: NCT03054688; NCT03975582.
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Affiliation(s)
- Felicia C. Derendinger
- Medical Outpatient Department and Hypertension Clinic, ESH Hypertension Centre of Excellence
- Faculty of Medicine, University Basel, Basel, Switzerland
| | - Annina S. Vischer
- Medical Outpatient Department and Hypertension Clinic, ESH Hypertension Centre of Excellence
- Faculty of Medicine, University Basel, Basel, Switzerland
| | - Philipp Krisai
- Department of Cardiology
- Cardiovascular Research Institute Basel, University Hospital Basel
- Faculty of Medicine, University Basel, Basel, Switzerland
| | - Thenral Socrates
- Medical Outpatient Department and Hypertension Clinic, ESH Hypertension Centre of Excellence
- Faculty of Medicine, University Basel, Basel, Switzerland
| | - Christina Schumacher
- Medical Outpatient Department and Hypertension Clinic, ESH Hypertension Centre of Excellence
| | - Michael Mayr
- Medical Outpatient Department and Hypertension Clinic, ESH Hypertension Centre of Excellence
- Faculty of Medicine, University Basel, Basel, Switzerland
| | - Thilo Burkard
- Medical Outpatient Department and Hypertension Clinic, ESH Hypertension Centre of Excellence
- Department of Cardiology
- Faculty of Medicine, University Basel, Basel, Switzerland
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Shin JH, Shin J. Evaluation of Applicability and Accuracy of a New Form of Cuffless Blood Pressure Measurement Device, CART-I Plus. Korean Circ J 2024; 54:105-107. [PMID: 38346697 PMCID: PMC10864252 DOI: 10.4070/kcj.2024.0016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2024] [Accepted: 01/23/2024] [Indexed: 02/16/2024] Open
Affiliation(s)
- Jeong-Hun Shin
- Division of Cardiology, Department of Internal Medicine, Hanyang University College of Medicine, Seoul, Korea.
| | - Jinho Shin
- Division of Cardiology, Department of Internal Medicine, Hanyang University College of Medicine, Seoul, Korea
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4
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Festo C, Vannevel V, Ali H, Tamrat T, Mollel GJ, Hlongwane T, Fahmida KA, Alland K, Barreix M, Mehrtash H, Silva R, Thwin SS, Mehl G, Labrique AB, Masanja H, Tunçalp Ӧ. Accuracy of a smartphone application for blood pressure estimation in Bangladesh, South Africa, and Tanzania. NPJ Digit Med 2023; 6:69. [PMID: 37069209 PMCID: PMC10107587 DOI: 10.1038/s41746-023-00804-z] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2022] [Accepted: 03/13/2023] [Indexed: 04/19/2023] Open
Abstract
Undetected and unmonitored hypertension carries substantial mortality and morbidity, especially during pregnancy. We assessed the accuracy of OptiBPTM, a smartphone application for estimating blood pressure (BP), across diverse settings. The study was conducted in community settings: Gaibandha, Bangladesh and Ifakara, Tanzania for general populations, and Kalafong Provincial Tertiary Hospital, South Africa for pregnant populations. Based on guidance from the International Organization for Standardization (ISO) 81,060-2:2018 for non-invasive BP devices and global consensus statement, we compared BP measurements taken by two independent trained nurses on a standard auscultatory cuff to the BP measurements taken by a research version of OptiBPTM called CamBP. For ISO criterion 1, the mean error was 0.5 ± 5.8 mm Hg for the systolic blood pressure (SBP) and 0.1 ± 3.9 mmHg for the diastolic blood pressure (DBP) in South Africa; 0.8 ± 7.0 mmHg for the SBP and -0.4 ± 4.0 mmHg for the DBP in Tanzania; 3.3 ± 7.4 mmHg for the SBP and -0.4 ± 4.3 mmHg for the DBP in Bangladesh. For ISO criterion 2, the average standard deviation of the mean error per subject was 4.9 mmHg for the SBP and 3.4 mmHg for the DBP in South Africa; 6.3 mmHg for the SBP and 3.6 mmHg for the DBP in Tanzania; 6.4 mmHg for the SBP and 3.8 mmHg for the DBP in Bangladesh. OptiBPTM demonstrated accuracy against ISO standards in study populations, including pregnant populations, except in Bangladesh for SBP (criterion 2). Further research is needed to improve performance across different populations and integration within health systems.
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Affiliation(s)
- Charles Festo
- Ifakara Health Institute, Dar es Salaam, Dar es Salaam, United Republic of Tanzania
| | - Valerie Vannevel
- South African Medical Research Council Maternal and Infant Health Care Strategies Unit, Pretoria, South Africa
- Research Centre for Maternal, Fetal, Newborn and Child Health Care Strategies, University of Pretoria, Pretoria, South Africa
- Department of Obstetrics and Gynaecology, Kalafong Provincial Tertiary Hospital, Pretoria, South Africa
| | - Hasmot Ali
- The JiVitA Maternal and Child Health and Nutrition Research Project, Nasirabad, Keranipara, Rangpur, 5400, Bangladesh
| | - Tigest Tamrat
- UNDP/UNFPA/UNICEF/World Bank Special Program of Research, Development and Research Training in Human Reproduction (HRP), Department of Sexual and Reproductive Health and Research, World Health Organization, Geneva, Switzerland.
| | - Getrud J Mollel
- Ifakara Health Institute, Dar es Salaam, Dar es Salaam, United Republic of Tanzania
| | - Tsakane Hlongwane
- South African Medical Research Council Maternal and Infant Health Care Strategies Unit, Pretoria, South Africa
- Research Centre for Maternal, Fetal, Newborn and Child Health Care Strategies, University of Pretoria, Pretoria, South Africa
- Department of Obstetrics and Gynaecology, Kalafong Provincial Tertiary Hospital, Pretoria, South Africa
| | - Kaniz A Fahmida
- The JiVitA Maternal and Child Health and Nutrition Research Project, Nasirabad, Keranipara, Rangpur, 5400, Bangladesh
| | - Kelsey Alland
- Center for Human Nutrition, Department of International Health, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, USA
| | - María Barreix
- UNDP/UNFPA/UNICEF/World Bank Special Program of Research, Development and Research Training in Human Reproduction (HRP), Department of Sexual and Reproductive Health and Research, World Health Organization, Geneva, Switzerland
| | - Hedieh Mehrtash
- UNDP/UNFPA/UNICEF/World Bank Special Program of Research, Development and Research Training in Human Reproduction (HRP), Department of Sexual and Reproductive Health and Research, World Health Organization, Geneva, Switzerland
| | - Ronaldo Silva
- UNDP/UNFPA/UNICEF/World Bank Special Program of Research, Development and Research Training in Human Reproduction (HRP), Department of Sexual and Reproductive Health and Research, World Health Organization, Geneva, Switzerland
| | - Soe Soe Thwin
- UNDP/UNFPA/UNICEF/World Bank Special Program of Research, Development and Research Training in Human Reproduction (HRP), Department of Sexual and Reproductive Health and Research, World Health Organization, Geneva, Switzerland
| | - Garrett Mehl
- Department of Digital Health and Innovations, World Health Organization, Geneva, Switzerland
| | - Alain B Labrique
- Center for Human Nutrition, Department of International Health, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, USA
- Department of Digital Health and Innovations, World Health Organization, Geneva, Switzerland
| | - Honorati Masanja
- Ifakara Health Institute, Dar es Salaam, Dar es Salaam, United Republic of Tanzania
| | - Ӧzge Tunçalp
- UNDP/UNFPA/UNICEF/World Bank Special Program of Research, Development and Research Training in Human Reproduction (HRP), Department of Sexual and Reproductive Health and Research, World Health Organization, Geneva, Switzerland
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Wang CF, Wang TY, Kuo PH, Wang HL, Li SZ, Lin CM, Chan SC, Liu TY, Lo YC, Lin SH, Chen YY. Upper-Arm Photoplethysmographic Sensor with One-Time Calibration for Long-Term Blood Pressure Monitoring. BIOSENSORS 2023; 13:321. [PMID: 36979533 PMCID: PMC10046397 DOI: 10.3390/bios13030321] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/23/2022] [Revised: 02/16/2023] [Accepted: 02/23/2023] [Indexed: 06/18/2023]
Abstract
Wearable cuffless photoplethysmographic blood pressure monitors have garnered widespread attention in recent years; however, the long-term performance values of these devices are questionable. Most cuffless blood pressure monitors require initial baseline calibration and regular recalibrations with a cuffed blood pressure monitor to ensure accurate blood pressure estimation, and their estimation accuracy may vary over time if left uncalibrated. Therefore, this study assessed the accuracy and long-term performance of an upper-arm, cuffless photoplethysmographic blood pressure monitor according to the ISO 81060-2 standard. This device was based on a nonlinear machine-learning model architecture with a fine-tuning optimized method. The blood pressure measurement protocol followed a validation procedure according to the standard, with an additional four weekly blood pressure measurements over a 1-month period, to assess the long-term performance values of the upper-arm, cuffless photoplethysmographic blood pressure monitor. The results showed that the photoplethysmographic signals obtained from the upper arm had better qualities when compared with those measured from the wrist. When compared with the cuffed blood pressure monitor, the means ± standard deviations of the difference in BP at week 1 (baseline) were -1.36 ± 7.24 and -2.11 ± 5.71 mmHg for systolic and diastolic blood pressure, respectively, which met the first criterion of ≤5 ± ≤8.0 mmHg and met the second criterion of a systolic blood pressure ≤ 6.89 mmHg and a diastolic blood pressure ≤ 6.84 mmHg. The differences in the uncalibrated blood pressure values between the test and reference blood pressure monitors measured from week 2 to week 5 remained stable and met both criteria 1 and 2 of the ISO 81060-2 standard. The upper-arm, cuffless photoplethysmographic blood pressure monitor in this study generated high-quality photoplethysmographic signals with satisfactory accuracy at both initial calibration and 1-month follow-ups. This device could be a convenient and practical tool to continuously measure blood pressure over long periods of time.
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Affiliation(s)
- Ching-Fu Wang
- Department of Biomedical Engineering, National Yang Ming Chiao Tung University, No. 155, Sec. 2, Linong St., Taipei 112304, Taiwan
- Biomedical Engineering Research and Development Center, National Yang Ming Chiao Tung University, Taipei 112304, Taiwan
| | - Ting-Yun Wang
- Department of Biomedical Engineering, National Yang Ming Chiao Tung University, No. 155, Sec. 2, Linong St., Taipei 112304, Taiwan
- Material and Chemical Research Laboratories, Industrial Technology Research Institute, No. 195, Sec. 4, Chunghsing Rd., Hsinchu 310401, Taiwan
| | - Pei-Hsin Kuo
- Department of Neurology, Hualien Tzu Chi Hospital, Buddhist Tzu chi Medical Foundation, No. 707, Sec. 3, Zhongyang Rd., Hualien 970473, Taiwan
- Department of Neurology, School of Medicine, Tzu Chi University, Hualien 97004, Taiwan
| | - Han-Lin Wang
- Department of Biomedical Engineering, National Yang Ming Chiao Tung University, No. 155, Sec. 2, Linong St., Taipei 112304, Taiwan
| | - Shih-Zhang Li
- Department of Biomedical Engineering, National Yang Ming Chiao Tung University, No. 155, Sec. 2, Linong St., Taipei 112304, Taiwan
| | - Chia-Ming Lin
- Microlife Corporation, 9F, No. 431, Ruiguang Rd., Taipei 114063, Taiwan
| | - Shih-Chieh Chan
- Department of Biomedical Engineering, National Yang Ming Chiao Tung University, No. 155, Sec. 2, Linong St., Taipei 112304, Taiwan
- Microlife Corporation, 9F, No. 431, Ruiguang Rd., Taipei 114063, Taiwan
| | - Tzu-Yu Liu
- Material and Chemical Research Laboratories, Industrial Technology Research Institute, No. 195, Sec. 4, Chunghsing Rd., Hsinchu 310401, Taiwan
| | - Yu-Chun Lo
- The Ph.D. Program in Medical Neuroscience, College of Medical Science and Technology, Taipei Medical University, No. 250, Wu-Xing St., Taipei 11031, Taiwan
| | - Sheng-Huang Lin
- Department of Neurology, Hualien Tzu Chi Hospital, Buddhist Tzu chi Medical Foundation, No. 707, Sec. 3, Zhongyang Rd., Hualien 970473, Taiwan
- Department of Neurology, School of Medicine, Tzu Chi University, Hualien 97004, Taiwan
| | - You-Yin Chen
- Department of Biomedical Engineering, National Yang Ming Chiao Tung University, No. 155, Sec. 2, Linong St., Taipei 112304, Taiwan
- The Ph.D. Program in Medical Neuroscience, College of Medical Science and Technology, Taipei Medical University, No. 250, Wu-Xing St., Taipei 11031, Taiwan
- Medical Device Innovation and Translation Center, National Yang Ming Chiao Tung University, Taipei 112304, Taiwan
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Vischer AS, Rosania J, Socrates T, Burkard T. Reply to Hungerford, S.; Bart, N. Blood-Pressure-Monitoring Smartphone Applications: Ushering in a New Era of Wearable Cardiac Devices? Comment on "Vischer et al. Comparability of a Blood-Pressure-Monitoring Smartphone Application with Conventional Measurements-A Pilot Study. Diagnostics 2022, 12, 749". Diagnostics (Basel) 2023; 13:diagnostics13020291. [PMID: 36673102 PMCID: PMC9858185 DOI: 10.3390/diagnostics13020291] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2023] [Accepted: 01/09/2023] [Indexed: 01/15/2023] Open
Abstract
We would like to thank Drs. Hungerford and Bart for their kind comment [...].
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Affiliation(s)
- Annina S. Vischer
- Medical Outpatient Department and Hypertension Clinic, ESH Hypertension Centre of Excellence, University Hospital Basel, 4031 Basel, Switzerland
- Faculty of Medicine, University of Basel, 4056 Basel, Switzerland
- Correspondence:
| | - Jana Rosania
- Medical Outpatient Department and Hypertension Clinic, ESH Hypertension Centre of Excellence, University Hospital Basel, 4031 Basel, Switzerland
- Faculty of Medicine, University of Basel, 4056 Basel, Switzerland
| | - Thenral Socrates
- Medical Outpatient Department and Hypertension Clinic, ESH Hypertension Centre of Excellence, University Hospital Basel, 4031 Basel, Switzerland
- Faculty of Medicine, University of Basel, 4056 Basel, Switzerland
| | - Thilo Burkard
- Medical Outpatient Department and Hypertension Clinic, ESH Hypertension Centre of Excellence, University Hospital Basel, 4031 Basel, Switzerland
- Faculty of Medicine, University of Basel, 4056 Basel, Switzerland
- Department of Cardiology, University Hospital Basel, 4031 Basel, Switzerland
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Wong MKF, Hei H, Lim SZ, Ng EYK. Applied machine learning for blood pressure estimation using a small, real-world electrocardiogram and photoplethysmogram dataset. MATHEMATICAL BIOSCIENCES AND ENGINEERING : MBE 2023; 20:975-997. [PMID: 36650798 DOI: 10.3934/mbe.2023045] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
Applying machine learning techniques to electrocardiography and photoplethysmography signals and their multivariate-derived waveforms is an ongoing effort to estimate non-occlusive blood pressure. Unfortunately, real ambulatory electrocardiography and photoplethysmography waveforms are inevitably affected by motion and noise artifacts, so established machine learning architectures perform poorly when trained on data of the Multiparameter Intelligent Monitoring in Intensive Care II type, a publicly available ICU database. Our study addresses this problem by applying four well-established machine learning methods, i.e., random forest regression, support vector regression, Adaboost regression and artificial neural networks, to a small, self-sampled electrocardiography-photoplethysmography dataset (n = 54) to improve the robustness of machine learning to real-world BP estimates. We evaluated the performance using a selection of optimal feature morphologies of waveforms by using pulse arrival time, morphological and frequency photoplethysmography parameters and heart rate variability as characterization data. On the basis of the root mean square error and mean absolute error, our study showed that support vector regression gave the best performance for blood pressure estimation from noisy data, achieving an mean absolute error of 6.97 mmHg, which meets the level C criteria set by the British Hypertension Society. We demonstrate that ambulatory electrocardiography- photoplethysmography signals acquired by mobile discrete devices can be used to estimate blood pressure.
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Affiliation(s)
- Mark Kei Fong Wong
- School of Mechanical and Aerospace Engineering, Nanyang Technological University, 639798, Singapore
| | - Hao Hei
- School of Electrical and Electronic Engineering, Nanyang Technological University, 639798, Singapore
| | - Si Zhou Lim
- School of Mechanical and Aerospace Engineering, Nanyang Technological University, 639798, Singapore
| | - Eddie Yin-Kwee Ng
- School of Mechanical and Aerospace Engineering, Nanyang Technological University, 639798, Singapore
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Vischer AS, Rosania J, Socrates T, Blaschke C, Eckstein J, Proust YM, Bonnier G, Proença M, Lemay M, Burkard T. Comparability of a Blood-Pressure-Monitoring Smartphone Application with Conventional Measurements-A Pilot Study. Diagnostics (Basel) 2022; 12:749. [PMID: 35328302 PMCID: PMC8947665 DOI: 10.3390/diagnostics12030749] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2022] [Revised: 03/14/2022] [Accepted: 03/17/2022] [Indexed: 02/06/2023] Open
Abstract
(1) Background: New cuffless technologies attempting blood-pressure measurements (BPM) offer possibilities to improve hypertension awareness and control. The aim of this study was to compare a smartphone application (app)-based algorithm with office BPM (OBPM). (2) Methods: We included consecutive patients with an indication for ambulatory BPM. The smartphone app (RIVA digital) acquired the pulse wave in the fingers’ arterial bed using the phone’s camera and estimated BP based on photoplethysmographic (PPG) waveforms. Measurements were alternatingly taken with an oscillometric cuff-based device and smartphone BPM (AppBP) on two consecutive days. AppBP were calibrated to the first OBPM. Each AppBP was compared to its CuffBP (mean of the previous/following OBPM). (3) Results: 50 participants were included, resulting in 50 AppBP values on Day 1 and 33 on Day 2 after exclusion of 225 AppBP due to insufficient quality. The mean ± SD of the differences between AppBP and CuffBP was 0.7 ± 9.4/1.0 ± 4.5 mmHg (p-value 0.739/0.201) on Day 1 and 2.6 ± 8.2/1.3 ± 4.1 mmHg (p-value 0.106/0.091) on Day 2 for systolic/diastolic values, respectively. There were no significant differences between the deviations on Day 1 and Day 2 (p-value 0.297/0.533 for systolic/diastolic values). Overall, there were 10 (12%) systolic measurement pairs differing by >15 mmHg. (4) Conclusions: In this pilot evaluation, the RIVA Digital app shows promising results when compared to oscillometric cuff-based measurements, especially regarding diastolic values. Its differences between AppBP−CuffBP have a good stability one day after calibration. Before clinical use, signal acquisition needs improvement and the algorithm needs to undergo formal validation against a gold-standard BPM method.
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Affiliation(s)
- Annina S. Vischer
- Medical Outpatient Department and Hypertension Clinic, ESH Hypertension Centre of Excellence, University Hospital Basel, 4031 Basel, Switzerland; (J.R.); (T.S.); (C.B.); (T.B.)
| | - Jana Rosania
- Medical Outpatient Department and Hypertension Clinic, ESH Hypertension Centre of Excellence, University Hospital Basel, 4031 Basel, Switzerland; (J.R.); (T.S.); (C.B.); (T.B.)
| | - Thenral Socrates
- Medical Outpatient Department and Hypertension Clinic, ESH Hypertension Centre of Excellence, University Hospital Basel, 4031 Basel, Switzerland; (J.R.); (T.S.); (C.B.); (T.B.)
| | - Christina Blaschke
- Medical Outpatient Department and Hypertension Clinic, ESH Hypertension Centre of Excellence, University Hospital Basel, 4031 Basel, Switzerland; (J.R.); (T.S.); (C.B.); (T.B.)
| | - Jens Eckstein
- Department of Internal Medicine, University Hospital Basel, 4031 Basel, Switzerland;
| | - Yara-Maria Proust
- Centre Suisse d’Electronique et de Microtechnique (CSEM), 2002 Neuchatel, Switzerland; (Y.-M.P.); (G.B.); (M.P.); (M.L.)
| | - Guillaume Bonnier
- Centre Suisse d’Electronique et de Microtechnique (CSEM), 2002 Neuchatel, Switzerland; (Y.-M.P.); (G.B.); (M.P.); (M.L.)
| | - Martin Proença
- Centre Suisse d’Electronique et de Microtechnique (CSEM), 2002 Neuchatel, Switzerland; (Y.-M.P.); (G.B.); (M.P.); (M.L.)
| | - Mathieu Lemay
- Centre Suisse d’Electronique et de Microtechnique (CSEM), 2002 Neuchatel, Switzerland; (Y.-M.P.); (G.B.); (M.P.); (M.L.)
| | - Thilo Burkard
- Medical Outpatient Department and Hypertension Clinic, ESH Hypertension Centre of Excellence, University Hospital Basel, 4031 Basel, Switzerland; (J.R.); (T.S.); (C.B.); (T.B.)
- Department of Cardiology, University Hospital Basel, 4031 Basel, Switzerland
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