keyword
MENU ▼
Read by QxMD icon Read
search

PPG

keyword
https://www.readbyqxmd.com/read/28708112/a-pulse-rate-detection-method-for-mouse-application-based-on-multi-ppg-sensors
#1
Shu-Tyng Lin, Wei-Hao Chen, Yuan-Hsiang Lin
Heart rate is an important physiological parameter for healthcare. Among measurement methods, photoplethysmography (PPG) is an easy and convenient method for pulse rate detection. However, as the PPG signal faces the challenge of motion artifacts and is constrained by the position chosen, the purpose of this paper is to implement a comfortable and easy-to-use multi-PPG sensor module combined with a stable and accurate real-time pulse rate detection method on a computer mouse. A weighted average method for multi-PPG sensors is used to adjust the weight of each signal channel in order to raise the accuracy and stability of the detected signal, therefore reducing the disturbance of noise under the environment of moving effectively and efficiently...
July 14, 2017: Sensors
https://www.readbyqxmd.com/read/28705807/augmentation-of-cgmp-pkg-pathway-and-colonic-motility-by-hydrogen-sulfide
#2
Ancy D Nalli, Sayak Bhattacharya, Hongxia Wang, Derek M Kendig, John R Grider, Karnam S Murthy
Hydrogen sulfide (H2S), like nitric oxide (NO), causes smooth muscle relaxation, but unlike NO, does not stimulate soluble guanylyl cyclase (sGC) activity and generate cGMP. The aim of this study was to investigate the interplay between NO and H2S in colonic smooth muscle. In colonic smooth muscle from rabbit, mouse and human, L-cysteine, substrate of cystathionine-γ-lyase (CSE), or NaHS, an H2S donor, inhibited phosphodiesterase 5 (PDE5) activity and augmented the increase in cGMP levels, IP3 receptor phosphorylation at Ser(1756) (measured as a proxy for PKG activation), and muscle relaxation in response to NO donor, s-nitrosoglutathione (GSNO), suggesting augmentation of cGMP/PKG pathway by H2S...
July 13, 2017: American Journal of Physiology. Gastrointestinal and Liver Physiology
https://www.readbyqxmd.com/read/28701038/micellear-gold-nanoparticle-as-delivery-vehicle-for-dual-tyrosine-kinase-inhibitor-zd6474-for-metastatic-breast-cancer-treatment
#3
Siddik Sarkar, Suraj Konar, Nagaprasad Puvvada, Shashi Rajput, Bn Prashanth Kumar, Raj R Rao, Amita Pathak, Paul B Fisher, Mahitosh Mandal
Therapeutic index of poorly water soluble drugs are often hampered due to poor pharmokinetics, reduced blood retention and lack of effective drug concentrations in the tumor region. In order to overcome these issues, drugs are often delivered using delivery vehicles to provide an enhanced therapeutic index. Gold nanoparticles synthesized in micellar networks of amphiphilic block copolymer (AuNM) provide an efficient nanocarrier for tissue- and site-specific drug delivery owing to their low cytotoxicity and immunogenicity...
July 12, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28685995/meta-analysis-and-critical-review-on-the-efficacy-and-safety-of-alpha-glucosidase-inhibitors-in-asian-and-non-asian-populations
#4
Xueying Gao, Xiaoling Cai, Wenjia Yang, Yifei Chen, Xueyao Han, Linong Ji
AIMS: To evaluate the efficacy and safety of alpha glucosidase inhibitors (AGI) in Asian and non-Asian type 2 diabetic patients. MATERIALS AND METHODS: Studies were identified through a literature search of MEDLINE, EMBASE, and other databases until December 2016. All statistical analyses were conducted in Review Manager statistical software by computing the weighted mean difference (WMD) or odds ratio (OR) and 95% confidence interval (CI). RESULTS: A total of 67 studies were included...
July 7, 2017: Journal of Diabetes Investigation
https://www.readbyqxmd.com/read/28680722/botulinum-toxin-injection-for-the-treatment-of-delayed-gastric-emptying-following-pylorus-preserving-gastrectomy-an-initial-experience
#5
Jung Hwan Lee, Chan Gyoo Kim, Young-Woo Kim, Il Ju Choi, Jong Yeul Lee, Soo-Jeong Cho, Young-Il Kim, Bang Wool Eom, Hong Man Yoon, Keun Won Ryu
PURPOSE: To report our experience of endoscopic botulinum toxin injection in patients who experienced severe delayed gastric emptying after pylorus-preserving gastrectomy (PPG). MATERIALS AND METHODS: We reviewed the medical records of 6 patients who received the botulinum toxin injection. They presented with severe delayed gastric emptying in the early postoperative period. Endoscopic botulinum toxin was administered as 4 injections of 25-50 IU into each of the 4 quadrants of the prepyloric area...
June 2017: Journal of Gastric Cancer
https://www.readbyqxmd.com/read/28675070/validity-of-heart-rate-measurements-by-the-garmin-forerunner-225-at-different-walking-intensities
#6
Jomme Claes, Roselien Buys, Andrea Avila, Dewar Finlay, Alan Kennedy, Daniel Guldenring, Werner Budts, Véronique Cornelissen
The accuracy of wrist worn heart rate monitors based on photoplethysmography (PPG) is not fully clinically accepted. Therefore, we aimed to validate heart rate measurements of a commercially available PPG heart rate monitor, i.e. the Garmin Forerunner(®) 225. Twelve healthy volunteers (six women; mean age: 28 years) performed a treadmill protocol consisting of: five minutes sitting, five minutes standing, 10 minutes walking at 4 km/h, 10 minutes walking at a gradient of 5% and intensity of 4-6 metabolic equivalents (METs), 10 minutes walking at a gradient of 8% and intensity of seven METs or more...
July 4, 2017: Journal of Medical Engineering & Technology
https://www.readbyqxmd.com/read/28671576/hybrid-optical-unobtrusive-blood-pressure-measurements
#7
Guangfei Zhang, Caifeng Shan, Ihor Kirenko, Xi Long, Ronald M Aarts
Blood pressure (BP) is critical in diagnosing certain cardiovascular diseases such as hypertension. Some previous studies have proved that BP can be estimated by pulse transit time (PTT) calculated by a pair of photoplethysmography (PPG) signals at two body sites. Currently, contact PPG (cPPG) and imaging PPG (iPPG) are two feasible ways to obtain PPG signals. In this study, we proposed a hybrid system (called the ICPPG system) employing both methods that can be implemented on a wearable device, facilitating the measurement of BP in an inconspicuous way...
July 1, 2017: Sensors
https://www.readbyqxmd.com/read/28669627/endogenous-hydrogen-sulfide-mediated-mapk-inhibition-preserves-endothelial-function-through-txnip-signaling
#8
Danyang Tian, Jinghui Dong, Sheng Jin, Xu Teng, Yuming Wu
Mounting evidence demonstrated deficient cystathionine-γ-lyase (CSE)/H2S implicated the development of cardiovascular disease. The present study aimed to evaluating the favorable action of CSE derived H2S on endothelial function in CSE(-/-) mice. CSE(-/-) mice exhibited attenuated endothelium-dependent relaxations, coupled with reduction of endothelial nitric oxide synthase (eNOS) phosphorylation at site of Ser1177, increase of thioredoxin interacting protein (TXNIP) level and MAPK phosphorylation, which were corrected by sodium hydrosulfide chronic treatment for 8 weeks...
June 29, 2017: Free Radical Biology & Medicine
https://www.readbyqxmd.com/read/28665142/targeting-one-hour-postmeal-glucose-is-it-time-for-a-paradigm-switch-in-diabetes-management
#9
Antonio Ceriello
In the management of diabetes, postprandial glycemia (PPG) is usually targeted 2 h after the start of meal. Recent evidences, however, suggest that the value of glycemia at 1 h during an oral glucose tolerance test (OGTT) is a stronger predictor for developing diabetes than the value at 2 h and that it is an independent risk factor for cardiovascular disease. Studies in cells, animals, and humans suggest that 1-h high glucose is a sufficient stimulus for increasing several cardiovascular risk factors, such as inflammation, thrombosis, and endothelial dysfunction, with oxidative stress generation as the possible pathogenetic factor...
June 30, 2017: Diabetes Technology & Therapeutics
https://www.readbyqxmd.com/read/28663876/amplitude-selective-filtering-for-remote-ppg
#10
Wenjin Wang, Albertus C den Brinker, Sander Stuijk, Gerard de Haan
Biometric signatures of remote photoplethysmography (rPPG), including the pulse-induced characteristic color absorptions and pulse frequency range, have been used to design robust algorithms for extracting the pulse-signal from a video. In this paper, we look into a new biometric signature, i.e., the relative pulsatile amplitude, and use it to design a very effective yet computationally low-cost filtering method for rPPG, namely "amplitude-selective filtering" (ASF). Based on the observation that the human relative pulsatile amplitude varies in a specific lower range as a function of RGB channels, our basic idea is using the spectral amplitude of, e...
March 1, 2017: Biomedical Optics Express
https://www.readbyqxmd.com/read/28663380/bone-microvascular-flow-differs-from-skin-microvascular-flow-in-response-to-head-down-tilt
#11
Michelle Howden, Jamila H Siamwala, Alan R Hargens
Loss of hydrostatic pressures in microgravity may alter skin and bone microvascular flows in the lower extremities and may potentially reduce wound healing and bone fracture repair. The purpose of this study was to determine the rate at which skin and bone microvascular flows respond to head down tilt (HDT). We hypothesized that microvascular flows in tibial bone and overlying skin would increase at different rates during HDT. Tibial bone and skin microvascular flows were measured simultaneously using photoplethysmography (PPG) in a total of 17 subjects during sitting (control posture), supine, 6° HDT, 15° HDT, and 30° HDT postures in random order...
June 29, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/28662699/hypoglycaemic-activity-of-mathurameha-a-thai-traditional-herbal-formula-aqueous-extract-and-its-effect-on-biochemical-profiles-of-streptozotocin-nicotinamide-induced-diabetic-rats
#12
Kullacha Chayarop, Penchom Peungvicha, Rungravi Temsiririrkkul, Yuvadee Wongkrajang, Wongsatit Chuakul, Piyanuch Rojsanga
BACKGROUND: The Thai traditional herbal formula-Mathurameha, consisting of 26 medicinal plants, has been used as an alternative and complementary medicine for diabetes treatment in Wangnamyen Hospital, Thailand. To provide scientific evidences on the efficacy and safety of this herbal formula, in vivo hypoglycaemic activity, effect on serum biochemical profiles and acute toxicity were investigated. METHODS: Experimental type 2 diabetes was induced in male Sprague-Dawley rats by intraperitoneal injection of nicotinamide 15 min prior to intravenous injection of streptozotocin...
June 29, 2017: BMC Complementary and Alternative Medicine
https://www.readbyqxmd.com/read/28643513/photochemical-cleavage-of-benzylic-c-o-bond-facilitated-by-an-ortho-or-meta-amino-group
#13
Xiong Ding, Pengfei Wang
The excited state meta effect, also known as the meta-ortho effect, results from selective electron transmission from an electron-donating group to the meta and ortho sites on an aromatic ring in its first excited singlet state. This effect facilitates photochemical cleavage of benzylic C-O or C-N bond to release the corresponding alcohol, carboxylic acid, or amine when an electron-donating amino group is at the meta position, as demonstrated in our recent work of using a 3-diethylaminobenzyl (DEABn) group as an effective photolabile protecting group (PPG)...
July 5, 2017: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/28640958/recommendations-for-revision-of-chinese-diagnostic-criterion-for-metabolic-syndrome-a-nationwide-study
#14
Ying Xing, Shaoyong Xu, Aihua Jia, Jing Cai, Mingwei Zhao, Jianhua Guo, Qiuhe Ji, Jie Ming
BACKGROUND: The metabolic syndrome (MS) criterion proposed by Chinese Diabetes Society (CDS) may have limitations, because it requires an additional 2-hour postprandial plasma glucose (2 h-PPG) to diagnose hyperglycemia. We aimed to revise the CDS criterion by removing the 2 h-PPG test, and determining the optimal fasting plasma glucose (FPG) cutoff for diagnosis of hyperglycemia in the Chinese population. METHODS: We obtained the study population from 2007-2008 China Diabetes and Metabolic Disorders Study...
June 22, 2017: Journal of Diabetes
https://www.readbyqxmd.com/read/28635643/a-multi-wavelength-opto-electronic-patch-sensor-to-effectively-detect-physiological-changes-against-human-skin-types
#15
Liangwen Yan, Sijung Hu, Abdullah Alzahrani, Samah Alharbi, Panagiotis Blanos
Different skin pigments among various ethnic group people have an impact on spectrometric illumination on skin surface. To effectively capture photoplethysmographic (PPG) signals, a multi-wavelength opto-electronic patch sensor (OEPS) together with a schematic architecture of electronics were developed to overcome the drawback of present PPG sensor. To perform a better in vivo physiological measurement against skin pigments, optimal illuminations in OEPS, whose wavelength is compatible with a specific skin type, were optimized to capture a reliable physiological sign of heart rate (HR)...
June 21, 2017: Biosensors
https://www.readbyqxmd.com/read/28625525/recombinant-lactobacillus-casei-expressing-clostridium-perfringens-toxoids-%C3%AE-%C3%AE-2-%C3%AE%C2%B5-and-%C3%AE-1-gives-protection-against-clostridium-perfringens-in-rabbits
#16
Li Zhao, Zhihou Guo, Jiali Liu, Zi Wang, Ruichong Wang, Yijing Li, Li Wang, Yigang Xu, Lijie Tang, Xinyuan Qiao
The present study used Lactobacillus casei ATCC 393 as antigen delivery system to express C. perfringens toxoids α-β2-ε-β1 to construct the recombination Lactobacillus casei pPG-2-α-β2-ε-β1/L. casei 393. After being induced by 1% xylose, the specificity and integrity of recombinant strain were determined by Western-blotting. Rabbits as native animal model were immunized orally with pPG-2-α-β2-ε-β1/L. casei 393 and the titers of specific IgG and sIgA were determined by ELISA. The result showed that oral administration with the recombinants could elicit both local mucosal and systemic immune responses...
July 13, 2017: Vaccine
https://www.readbyqxmd.com/read/28613118/initial-experience-with-a-new-quantitative-assessment-tool-for-fluorescent-imaging-in-peripheral-artery-disease
#17
Henrik Christian Rieß, Anna Duprée, Christian-Alexander Behrendt, Tilo Kölbel, Eike Sebastian Debus, Axel Larena-Avellaneda, Detlef Russ, Sabine Wipper
BACKGROUND: Perioperative evaluation in peripheral artery disease (PAD) by common vascular diagnostic tools is limited by open wounds, medial calcinosis or an altered collateral supply of the foot. Indocyanine green fluorescent imaging (ICG-FI) has recently been introduced as an alternative tool, but so far a standardized quantitative assessment of tissue perfusion in vascular surgery has not been performed for this purpose. The aim of this feasibility study was to investigate a new software for quantitative assessment of tissue perfusion in patients with PAD using indocyanine green fluorescent imaging (ICG-FI) before and after peripheral bypass grafting...
June 14, 2017: VASA. Zeitschrift Für Gefässkrankheiten
https://www.readbyqxmd.com/read/28612929/flexible-organic-inorganic-hybrid-near-infrared-photoplethysmogram-sensor-for-cardiovascular-monitoring
#18
Huihua Xu, Jing Liu, Jie Zhang, Guodong Zhou, Ningqi Luo, Ni Zhao
Wearable photoplethysmogram (PPG) sensors offer convenient and informative measurements for evaluating daily physiological states of individuals. In this work, epidermal and flexible near-infrared (NIR) PPG sensors integrating a low-power, high-sensitivity organic phototransistor (OPT) with a high-efficiency inorganic light-emitting diode are developed. By exploiting an organic bulk heterojunction active layer and a bilayer gate dielectric design, a low voltage (<3 V) operated OPT with NIR responsivity as high as 3...
June 14, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28607414/diagnostic-capability-of-pulsar-perimetry-in-pre-perimetric-and-early-glaucoma
#19
Kazunori Hirasawa, Natsumi Takahashi, Kazuhiro Matsumura, Masayuki Kasahara, Nobuyuki Shoji
This study aimed to compare the diagnostic capability of Pulsar perimetry (Pulsar) in pre-perimetric glaucoma (PPG) and early glaucoma (EG) with that of Flicker perimetry (Flicker) and spectral-domain optical conference tomography (SD-OCT). This prospective cross-sectional study included 25 eyes of 25 PPG patients, 35 eyes of 35 EG patients, and 42 eyes of 42 healthy participants. The diagnostic capability using the area under the curve (AUC) of the best parameter and agreement of detectability between structural and functional measurements were compared...
June 12, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28605182/%C3%AE-%C3%AF-diphenylalanine-end-capping-of-peg-ppg-peg-polymers-changes-the-micelle-morphology-and-enhances-stability-of-the-thermogel
#20
Hae An Kim, Hyun Jung Lee, Ja Hye Hong, Hyo Jung Moon, Du Young Ko, Byeongmoon Jeong
Pluronics F127 (P, PEG-PPG-PEG triblock copolymer) was coupled with diphenylalanine (FF) to prepare FF-end-capped Pluronics (FFPFF). With increasing temperature from 10 to 60 °C, the FFPFF self-assembled to vesicles in water. The unimer-to-vesicle transition accompanies endothermic enthalpy of 53.9 kcal/mol. Aqueous P and FFPFF solutions exhibited thermogelation in 15.0-24.0 wt %. The gel phase of FFPFF was stable up to 90 °C, whereas that of P turned into a sol again at 55-86 °C, indicating that end-capping with FF improved the gel stability against heat...
June 22, 2017: Biomacromolecules
keyword
keyword
21597
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"