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https://www.readbyqxmd.com/read/28325016/sleep-stage-classification-by-non-contact-vital-signs-indices-using-doppler-radar-sensors
#1
Masayuki Kagawa, Kazuki Suzumura, Takemi Matsui
Disturbed sleep has become more common in recent years. To improve the quality of sleep, undergoing sleep observation has gained interest as a means to resolve possible problems. In this paper, we evaluate a non-restrictive and non-contact method for classifying real-time sleep stages and report on its potential applications. The proposed system measures heart rate (HR), heart rate variability (HRV), body movements, and respiratory signals of a sleeping person using two 24-GHz microwave radars placed beneath the mattress...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28324997/assessing-the-development-of-fetal-myocardial-function-by-a-novel-doppler-myocardial-performance-index
#2
Ahsan H Khandoker, F Marzbanrad, Y Kimura, Saeed Al Nuaimi, M Palaniswami
Doppler-derived myocardial performance index are used to assess aspects of systolic and diastolic function in adult as well as fetal heart. The Tei Index (TI) is a useful and non-invasive tool. The aim of this study was to determine normal values of fetal left ventricular (LV) TI in early (16-32 weeks) and late trimester (35-41 weeks) fetuses and to develop a new myocardial performance index (K-index; KI) which focuses on fetal diastolic interval when oxygenated blood from the placenta filled in the LV. Simultaneous recordings of Doppler Ultrasound Signal (DUS) of the LV outflow tracts and fetal electrocardiogram signals were obtained in 55 early- and late-trimester fetuses...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28324990/indirect-measurement-of-the-carotid-arterial-pressure-from-vibrocardiographic-signal-calibration-of-the-waveform-and-comparison-with-photoplethysmographic-signal
#3
L Casacanditella, G Cosoli, S Casaccia, E P Tomasini, L Scalise
The detection of arterial Blood Pressure waveform provides important information about the subject health status. Laser Doppler Vibrometry (LDV) is a non-contact technique with high sensitivity able to detect mechanical movements of the arterial wall; several previous studies have shown that LDV is able to characterize cardiac activity. Photoplethysmogram (PPG) quantifies the digital volume artery pulse, which has been demonstrated to be closely related to the pressure signal measured by an arterial tonometer...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28324353/the-fast-d-protocol-a-simple-method-to-rule-out-traumatic-vascular-injuries-of-the-lower-extremities
#4
Miguel Angel Montorfano, Lisandro Miguel Montorfano, Federico Perez Quirante, Federico Rodríguez, Leonardo Vera, Luca Neri
BACKGROUND: The aim of this study is to assess the accuracy of a Fast Doppler protocol for the examination of an injured lower limb, namely 2-Point Fast Doppler (2PFD), in order to rapidly triage arterial lesions after penetrating trauma. METHODS: The presence of flow and the aspects of the Doppler waveform of the dorsalis pedis artery (DPA) and posterior tibial artery (PTA) of the injured lower limb (2PFD) were evaluated immediately before the execution of a standardized Color Duplex Doppler (SD) evaluation in 149 limbs of 140 patients with gunshot penetrating injuries...
December 2017: Critical Ultrasound Journal
https://www.readbyqxmd.com/read/28320115/reversible-cerebral-vasoconstriction-syndrome-in-puerperium-a-prospective-study
#5
Gian Paolo Anzola, Renato Brighenti, Milena Cobelli, Alessia Giossi, Sara Mazzucco, Silvia Olivato, Elisa Pari, Maria Paola Piras, Alessandro Padovani, Fabrizio Rinaldi, Giulia Turri
BACKGROUND AND AIM OF THE STUDY: Reversible cerebral vasoconstriction syndrome (RCVS) is characterized by severe "thunderclap" headache, with or without associated neurological symptoms and neuroimaging findings of reversible vasoconstriction of cerebral arteries. Puerperium is a recognized precipitant, but the incidence of puerperal RCVS is unknown. We conducted a prospective study to assess incidence, risk factors and clinical features of RCVS. MATERIAL AND METHOD: Nine-hundred consecutive puerperae were prospectively enrolled within three days of delivery...
April 15, 2017: Journal of the Neurological Sciences
https://www.readbyqxmd.com/read/28320068/thoracic-electrical-bioimpedance-versus-suprasternal-doppler-in-emergency-care
#6
Mohammed H Elwan, Jeremy Hue, Samira J Green, Salah M Eltahan, Mark R Sims, Timothy J Coats
OBJECTIVE: There are a number of cardiac output (CO) monitors that could potentially be used in the ED. Two of the most promising methods, thoracic electrical bioimpedance and suprasternal Doppler, have not been directly compared. The aim of this study was to investigate the feasibility of CO monitoring using suprasternal Doppler and bioimpedance in emergency care and compare haemodynamic data obtained from both monitors. METHODS: Haemodynamic measurements were made on the same group of patients using bioimpedance (Niccomo, Medis, Germany) and suprasternal Doppler (USCOM, Sydney, Australia)...
March 20, 2017: Emergency Medicine Australasia: EMA
https://www.readbyqxmd.com/read/28319947/effects-of-capsaicin-on-older-patients-with-oropharyngeal-dysphagia-a-double-blind-placebo-controlled-crossover-study
#7
Rui Nakato, Noriaki Manabe, Sayako Shimizu, Kozo Hanayama, Akiko Shiotani, Jiro Hata, Ken Haruma
BACKGROUND/AIMS: The standard of care for older patients with oropharyngeal dysphagia (OD) is poor. Stimulation of transient receptor potential vanilloid 1 might become a pharmacological strategy for these patients. This study aimed to compare the therapeutic effect of film food containing 0.75 µg of capsaicin in these patients. METHODS: In a crossover, randomized trial, 49 patients with OD were provided capsaicin or identical placebo at least 7 days apart. Patients' reported symptoms during repeated swallowing, the volume, pH and substance P (SP) concentrations in saliva, and cervical esophageal wall motion evaluated by ultrasonographic tissue Doppler imaging were obtained before and after capsaicin or placebo administration...
March 21, 2017: Digestion
https://www.readbyqxmd.com/read/28319641/correlation-of-visually-evoked-functional-and-blood-flow-changes-in-the-rat-retina-measured-with-a-combined-oct-erg-system
#8
Bingyao Tan, Erik Mason, Benjamin MacLellan, Kostadinka K Bizheva
Purpose: To correlate visually evoked functional and blood flow changes in the rat retina measured simultaneously with a combined optical coherence tomography and electroretinography system (OCT+ERG). Methods: Male Brown Norway (n = 6) rats were dark adapted and anesthetized with ketamine/xylazine. Visually evoked changes in the retinal blood flow (RBF) and functional response were measured simultaneously with an OCT+ERG system with 3-μm axial resolution in retinal tissue and 47-kHz image acquisition rate...
March 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/28319285/color-doppler-ultrasound-early-diagnoses-simulator-of-proliferative-nodule-in-congenital-melanocytic-nevus
#9
P Giavedoni, L Aranibar, X Wortsman
Congenital melanocytic nevus (CMN) is a benign proliferation of cutaneous melanocytes that arises as the result of abnormal growth, development, or migration of melanoblasts (1) . They are clinically evident at birth and usually produce a high degree of stress among physicians and parents due to the risk of malignant transformation. In spite that the actual lifetime risk of developing melanoma from a small or medium-sized CMN is unknown, and some reports estimate this risk to be less than 5%, any recent-onset palpable nodule in a CMN may be worrisome...
March 20, 2017: Journal of the European Academy of Dermatology and Venereology: JEADV
https://www.readbyqxmd.com/read/28319252/physiologic-reduction-of-hepatic-venous-blood-flow-by-the-valsalva-maneuver-decreases-liver-stiffness
#10
Selcan Ipek-Ugay, Heiko Tzschätzsch, Jürgen Braun, Thomas Fischer, Ingolf Sack
OBJECTIVES: Liver stiffness increases after intake of food or water, suggesting that hepatic venous blood flow affects the results of elastographic measurements. This study investigated the correlation between in vivo liver stiffness and hepatic blood flow using the Valsalva maneuver for reducing intrahepatic venous blood flow. METHODS: Intrahepatic changes in venous blood flow were assessed by sonography based on the pulsed wave Doppler velocity, vessel diameter assessment, and blood flow volume measurements in the portal vein and right hepatic vein...
March 20, 2017: Journal of Ultrasound in Medicine: Official Journal of the American Institute of Ultrasound in Medicine
https://www.readbyqxmd.com/read/28318183/clinico-radiological-correlation-of-nutcracker-syndrome-a-single-centre-experience
#11
Aysel Taktak, Tulin Hakan Demirkan, Banu Acar, Gökçe Gu R, Adem Köksoy, Nermin Uncu, Fatma Ş Çaycı, Nilgu N Çakar
The term nutcracker syndrome (NS) refers to the compression of left renal vein between the aorta and the superior mesenteric artery (SMA) causing renal venous hypertension. The symptoms vary from asymptomatic hematuria to severe pelvic congestion. The purpose of this study is to evaluate the clinical characteristics of patients with NS and the correlation between clinical and laboratory findings with Doppler sonographic measurements. Sixty-three patients were evaluated (19 boys and 44 girls) since January 2004 to January 2014...
April 1, 2017: Archivos Argentinos de Pediatría
https://www.readbyqxmd.com/read/28317826/-modern-approaches-to-periodontal-microcirculatory-parameters-assessment
#12
E K Krechina, T N Smirnova
The article presents comprehensive functional study of periodontal tissues in 62 patients aged 20-45 with periodontal disease by laser Doppler flowmetry, Doppler ultrasound and computer capillaroscopy. All patients were divided into 5 groups depending on the severity of inflammation in the periodontium (chronic gingivitis, light, moderate and severe chronic periodontal disease). The relationship between microcirculatory indexes was evaluated by Pearson Product Moment Correlation or PPMC. The study shows high correlation between blood flow velocity measurement, diameter of microvessels and oxygen saturation in periodontal tissues that establish a direct relationship between studied parameters...
2017: Stomatologii︠a︡
https://www.readbyqxmd.com/read/28317214/characterization-of-blood-flow-through-intrapulmonary-arteriovenous-anastomoses-and-patent-foramen-ovale-at-rest-and-during-exercise-in-stroke-and-transient-ischemic-attack-patients
#13
Rinaldo Romac, Otto Barak, Duska Glavas, Zora Susilovic Grabovac, Petar Lozo, Igor Roje, Kresimir Caljkusic, Irena Drmic-Hofman, James T Davis, Zeljko Dujic, Andrew T Lovering
OBJECTIVES: We determined whether stroke and/or TIA subjects have exercise-induced blood flow through intrapulmonary arteriovenous anastomoses (QIPAVA ) and/or patent foramen ovale (QPFO ) and a genetic predisposition for ischemic stroke. METHODS: Twenty-eight stroke and/or TIA subjects (33-63 years old) underwent transthoracic saline contrast echocardiography concomitant with transcranial Doppler to detect QIPAVA and QPFO at rest and during supine exercise with and without breathing 100% O2 ...
March 19, 2017: Echocardiography
https://www.readbyqxmd.com/read/28317206/vena-contracta-analysis-by-color-doppler-three-dimensional-transesophageal-echocardiography-shows-geometrical-differences-between-prolapse-and-pseudoprolapse-in-eccentric-mitral-regurgitation
#14
Javier Berdejo, Maiko Shiota, Hirotsugu Mihara, Yuji Itabashi, Hiroto Utsunomiya, Takahiro Shiota
AIMS: Evaluation of eccentric mitral regurgitation (MR) remains extremely difficult and the role played by its etiology, functional or degenerative, is not well understood. This study aimed to demonstrate the value of three-dimensional transesophageal echocardiography (3DTEE) in the evaluation of eccentric MR identifying geometric differences in the vena contracta area between functional and degenerative etiologies. METHODS AND RESULTS: We studied 61 patients with eccentric MR (30 functional and 31 degenerative)...
March 19, 2017: Echocardiography
https://www.readbyqxmd.com/read/28317170/added-clinical-value-of-applying-myocardial-deformation-imaging-to-assess-right-ventricular-function
#15
REVIEW
Vladislavs Sokalskis, Diletta Peluso, Annika Jagodzinski, Christoph Sinning
Right heart dysfunction has been found to be a strong prognostic factor predicting adverse outcome in various cardiopulmonary diseases. Conventional echocardiographic measurements can be limited by geometrical assumptions and impaired reproducibility. Speckle tracking-derived strain provides a robust quantification of right ventricular function. It explicitly evaluates myocardial deformation, as opposed to tissue Doppler-derived strain, which is computed from tissue velocity gradients. Right ventricular longitudinal strain provides a sensitive tool for detecting right ventricular dysfunction, even at subclinical levels...
March 19, 2017: Echocardiography
https://www.readbyqxmd.com/read/28317163/the-value-of-diastolic-flow-reversal-in-the-descending-thoracic-aorta-as-a-determinant-of-invasively-measured-aortic-pulse-pressure
#16
Hack-Lyoung Kim, Yu Nui Kim, Hee-Jun Kim, Woo-Hyun Lim, Jae-Bin Seo, Sang-Hyun Kim, Myung-A Kim, Joo-Hee Zo
AIM: Although the diastolic flow reversal of the descending aorta has been recognized in patients with aortic regurgitation, its generation without this condition is still unknown. This study was performed to investigate whether flow patterns of the descending thoracic aorta, as measured by echocardiography, can represent invasively measured aortic pulse pressure (APP). METHODS: A total of 100 patients (age, 62.3±11.0 years; men, 62.0%) undergoing invasive coronary angiography (ICA) was analyzed...
March 19, 2017: Echocardiography
https://www.readbyqxmd.com/read/28317072/sonographic-classification-of-testicular-tumors-by-tissue-harmonic-imaging-experience-of-58-cases
#17
Atsuo Kawamoto, Tadashi Hatano, Kazuhiro Saito, Rie Inoue, Toshitaka Nagao, Shigeru Sanada
PURPOSE: To evaluate the relationship between our proposed sonographic classification of testicular tumors by tissue harmonic imaging and histological type. METHODS: We retrospectively analyzed 58 testicular tumors and tumor-like lesions [seminomatous germ cell tumor (SGCT): 28; non-seminomatous germ cell tumor (NSGCT): 16; lymphoid and hematopoietic tumor (LHT): 7; Leydig cell tumor: 1; epidermal cyst: 2; and tumor of paratesticular structure (TPS): 4]. We divided a sonographic image into six types for morphological criteria and three types for color Doppler criteria...
March 20, 2017: Journal of Medical Ultrasonics
https://www.readbyqxmd.com/read/28316327/obstructive-primary-cardiac-t-cell-lymphoma-a-case-report-from-senegal
#18
Simon Antoine Sarr, Abdou Majib Gaye, Fatou Aw, Jean de Dieu Nzambaza, Malick Bodian, Kana Babaka, Mouhamadou Bamba Ndiaye, Adama Kane, Maboury Diao, Serigne Abdou Ba
BACKGROUND Cardiac lymphoma is a rare entity, defined by the non-extra cardiac location at diagnosis. CASE REPORT Our patient was a 32-year-old female with no particular medical history, who presented with right heart failure with recurrent ascites and pleural effusion. There was a progressive worsening exertional dyspnea. On admission, examination revealed an irregular tachycardia at 170 beats per minute (bpm) and congestive heart failure. The electrocardiogram scored full tachyarrhythmia by atrial fibrillation with an average ventricular rate of 179 cycles per minute...
March 20, 2017: American Journal of Case Reports
https://www.readbyqxmd.com/read/28316167/-influences-of-high-voltage-electrical-burns-on-microcirculation-perfusion-on-serosal-surface-of-small-intestine-of-rats-and-the-interventional-effects-of-pentoxifylline
#19
Q F Zhang, S J Xu, L M Liang, J K Feng, Y F Xu, L L Tu
Objective: To investigate influences of high-voltage electrical burns on microcirculation perfusion on serosal surface of small intestine of rats and the interventional effects of pentoxifylline (PTX). Methods: Totally 180 SD rats were divided into sham injury group, simple electrical burn group, and treatment group according to the random number table, with 60 rats in each group. The electrical current was applied to the outside proximal part of left forelimb of rats and exited from the outside proximal part of right hind limb of rats...
March 20, 2017: Zhonghua Shao Shang za Zhi, Zhonghua Shaoshang Zazhi, Chinese Journal of Burns
https://www.readbyqxmd.com/read/28315942/forgotten-right-ventricle-in-pediatric-dilated-cardiomyopathy
#20
Hala Mounir Agha, Hossam Ibrahim, Inas Abd El Satar, Naglae Abd El Rahman, Doaa Abd El Aziz, Zeinab Salah, Sonia El Saeidi, Fatma Mostafa, Wael Attia, Mohamed Abd El Rahman, Gaser Abd El Mohsen
To evaluate the right ventricular (RV) function in relation to that of the left ventricle (LV) in patients with dilated cardiomyopathy (DCM). Echocardiographic examination was done using tissue Doppler imaging (TDI) and two-dimensional speckle tracking echocardiography (2D-STE) for 32 pediatric patients with DCM comparing them to another 32 normal matched controls. The global longitudinal strain (GLS) derived from 2D-STE was used to reflect the LV systolic function. Tricuspid annular plan systolic excursion (TAPSE) and the following RV TDI derived indexes: peak systolic velocity (S'), peak early diastolic velocity E', peak late diastolic velocity A', isovolumic acceleration (IVA) and myocardial performance index (MPI) were measured...
March 18, 2017: Pediatric Cardiology
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