Non-contact assessment of cardiac physiology using FO-MVSS-based ballistocardiography: a promising approach for heart failure evaluation.

Continuous monitoring of cardiac motions has been expected to provide essential cardiac physiology information on cardiovascular functioning. A fiber-optic micro-vibration sensing system (FO-MVSS) makes it promising. This study aimed to explore the correlation between Ballistocardiography (BCG) waveforms, measured using an FO-MVSS, and myocardial valve activity during the systolic and diastolic phases of the cardiac cycle in participants with normal cardiac function and patients with congestive heart failure (CHF).

Anti-noise UWFBG-array enhanced DAS system using double-pulse-based time-domain adaptive delay interference: publisher's note.

This publisher's note contains a correction to Opt. Lett.48, 1814 (2023)10.

Anti-noise UWFBG-array enhanced DAS system using double-pulse-based time-domain adaptive delay interference.

An anti-noise interrogation technique for ultra-weak fiber Bragg grating (UWFBG)-based distributed acoustic sensing (DAS) systems is proposed and demonstrated using double-pulse-based time-domain adaptive delay interference. This technique breaks the limitation that the optical path difference (OPD) between the two arms of the interferometer should be completely matched with the entire OPD between the adjacent gratings in the traditional single-pulse system. The length of the delay fiber in the interferometer can be reduced, and the double-pulse interval can adapt flexibly to the UWFBG array with different grating spacing.

Variational mode decomposition-based abnormal wheel-rail relationship detection in distributed acoustic sensing.

The distributed acoustic sensing system can obtain the vibration signal caused by the vibration of the train. By analyzing these wheel-rail vibration signals, an abnormal wheel-rail relationship identification scheme is proposed. The variational mode decomposition is employed for signal decomposition, thereby obtaining intrinsic mode functions with prominent abnormal fluctuations.

Clinical outcomes of the severe acute respiratory syndrome coronavirus 2 Omicron and Delta variant: systematic review and meta-analysis of 33 studies covering 6 037 144 coronavirus disease 2019-positive patients.

Background: Although the SARS-CoV-2 Omicron variant is considered to induce less severe disease, there have been no consistent results on the extent of the decrease in severity.

Objectives: To compare the clinical outcomes of COVID-19-positive patients with Omicron and Delta variant infection.

Data Sources: Searches were implemented up to 8 November 2022 in PubMed, Web of Science, BioRvix, and MedRvix.

Effect of matrix metalloproteinases on the healing of diabetic foot ulcer: A systematic review.

Background: This study aims to discuss the expression of matrix metalloproteinase in wound healing of diabetic foot ulcers and further summarize the strategies of targeted matrix metalloproteinase and its inhibitors in the treatment of diabetic foot ulcers.

Methods: Following PRISMA-SCR guidelines, databases (PubMed, Home-PMC-NCBI, CINAHL, Web of Science) were systematically searched from inception to 19 June 2022. Newcastle-Ottawa Scale (NOS) was used to evaluate the bias risk of the included studies.

Polarization fading suppression in distributed interferometric sensing by matched interference between polarization-switched pulses.

A polarization fading suppression technique is proposed for distributed interferometric sensing systems, based on matched interference between polarization switched pulses. For each individual sensor, two sets of interferometric outputs are obtained, one corresponding to the interference between two pulses with initially parallel polarization, the other corresponding to that between two pulses with initially orthogonal polarizations. As such, at least one output presents visibility no less than 2/2.

C-reactive protein and diabetic foot ulcer infections: A meta-analysis.

Background: Accurate identification of diabetic foot ulcer infection (IDFU) through inflammatory markers is still a challenge in clinical practice.

Objectives: This meta-analysis aims to investigates whether there is a significant indigenous association between CRP level and diabetic foot ulcer infection.

Methods: The studies on the diagnosis of IDFU by inflammatory marker C-reactive protein published before November 2021 in PubMed, Web of Science, Embase, and Cochrane Library were searched.

Relationship between depressive symptoms and internet usage time among adolescents: Results from a nationwide survey.

Adolescent depression is becoming a public health problem. In this study the association between depressive symptoms and internet usage time in adolescents was examined, with data collected from the China Education Tracking Survey (CEPS). The survey is publicly available and carried out nationwide.

COVID-19 in patients with systemic lupus erythematosus: A systematic review.

The objectives of the study were to review the articles to identify (a) the epidemiology of systemic lupus erythematosus (SLE) and coronavirus disease 2019 (COVID-19); (b) the clinical characteristics of SLE patients with COVID-19; (c) the treatment of COVID-19 in SLE patients; and (d) the impact of COVID-19 pandemic on SLE patients. PubMed was systematically reviewed for literature published from December 2019 to June 2021. Our search was limited to human studies, with language restriction of English.

Efficacy and safety of angiogenesis inhibitors in melanoma: a meta-analysis of seven randomized controlled trials.

Little is known about the efficacy and safety of angiogenesis inhibitor therapy in patients with melanoma. The objective of this study was to assess the possible benefits and harms of angiogenesis inhibitor therapy in patients with melanoma. Electronic databases of PubMed and Web of Science were searched from inception to January 2020.

High dynamic range distributed acoustic sensing based on dual-wavelength fiber Bragg grating pairs.

A high dynamic range distributed acoustic sensing (DAS) system is demonstrated based on a dual-wavelength (2) interferometric acoustic sensor array, constructed using 2 fiber Bragg grating pairs (FBGPs). Each FBGP is composed of two weak FBGs presenting -30-dB reflectivity and center wavelengths of 1535 nm and 1565 nm. With the phase demodulation results from the two wavelengths, 2 linear regression phase unwrapping is implemented, which significantly enhances the dynamic range of the DAS system.

Vital signs monitoring using the macrobending small-core fiber sensor.

Respiration and heartbeat monitoring during sleep is essential in the assessment of personal health. However, conventional monitoring systems are complex, expensive, and uncomfortable. In this Letter, a mat embedded with a macrobending optical fiber sensor is proposed for non-contact vital signs monitoring during sleep based on vibration sensing.