keyword
https://read.qxmd.com/read/38495722/measuring-pulsatile-cortical-blood-flow-and-volume-during-carotid-endarterectomy
#1
JOURNAL ARTICLE
Alexander I Zavriyev, Kutlu Kaya, Kuan Cheng Wu, Eric T Pierce, Maria Angela Franceschini, Mitchell B Robinson
Carotid endarterectomy (CEA) involves removal of plaque in the carotid artery to reduce the risk of stroke and improve cerebral perfusion. This study aimed to investigate the utility of assessing pulsatile blood volume and flow during CEA. Using a combined near-infrared spectroscopy/diffuse correlation spectroscopy instrument, pulsatile hemodynamics were assessed in 12 patients undergoing CEA. Alterations to pulsatile amplitude, pulse transit time, and beat morphology were observed in measurements ipsilateral to the surgical side...
March 1, 2024: Biomedical Optics Express
https://read.qxmd.com/read/38490241/evaluation-of-cerebral-autoregulation-of-oxygen-by-nirs-method-during-postnatal-transition-period-in-term-and-late-preterm-newborns-without-resuscitation-requirement
#2
JOURNAL ARTICLE
Omer Ertekin, Mehmet Buyuktiryaki, Sehribanu Isik, Nilufer Okur, Serife Suna Oguz
BACKGROUND: Pulse oximetry is commonly used to monitor arterial oxygen saturation and heart rate during the transition period and reference intervals have been determined. However, the effect of the change in arterial oxygen saturation on tissue oxygenation does not seem to be the same. So, a non-invasive method for monitoring cerebral or regional tissue oxygenation will be potentially useful for vulnerable infants. This study aims to evaluate the effectiveness of cerebral autoregulation in the first 10 min after delivery in term and late preterm newborns without resuscitation requirement...
February 7, 2024: Journal of Tropical Pediatrics
https://read.qxmd.com/read/38485759/identifying-delay-in-glymphatic-clearance-of-labeled-protons-post-acute-head-trauma-utilizing-3d-asl-mri-arterial-spin-labeling-a-pilot-study
#3
JOURNAL ARTICLE
Charles R Joseph, Jubin Kang Lim, Bryce N Grohol, Marija Zivcevska, Joshua Lencke, Ethan Dean Rich, Connor James Arrasmith, Ian Shepherd Dorman, Bradley Waman Clark, Kim Love, Ben Ferry, Mark E Rolfs
This study correlated mild traumatic brain injury (mTBI) cognitive changes with ASL-MRI glymphatic clearance rates (GCRs) and recovery with GCR improvement. mTBI disrupts the blood brain barrier (BBB), reducing capillary mean transit time and GCRs. mTBI is clinically diagnosed utilizing history/examination findings with no physiologic biomarkers. 3D TGSE (turbo-gradient spin-echo) pulsed arterial spin-labeling 3T MRI with 7 long inversion times (TIs) assessed the signal clearance of labeled protons 2800-4000 ms postlabeling in bifrontal, bitemporal, and biparietal regions within 7 days of mTBI and once clinically cleared to resume activities...
March 14, 2024: Scientific Reports
https://read.qxmd.com/read/38426867/short-term-vascular-responses-to-spring-and-fall-daylight-savings-time-shifts
#4
JOURNAL ARTICLE
Dara Al-Bakry, Chloe E Athaide, Rishiga Pathmarajan, Tara Kuhn, Laura E Middleton, Jason S Au
Daylight saving time (DST) is a Western biannual time transition, setting the clock back one hour in the fall and forward one hour in the spring. There is an epidemiological link between DST and acute myocardial infarction risk in the first week following the spring shift; however, the mechanisms underlying the effect of DST on cardiovascular function remain unclear. The purpose of this study was to explore the short-term cardiovascular changes induced by fall and spring shifts in DST in a convenience sample of healthy adults...
March 1, 2024: American Journal of Physiology. Heart and Circulatory Physiology
https://read.qxmd.com/read/38422512/respiratory-gating-improves-correlation-between-pulse-wave-transit-time-and-pulmonary-artery-pressure-in-experimental-pulmonary-hypertension
#5
JOURNAL ARTICLE
Fabian Mueller-Graf, Paul Frenkel, Jonas Merz, Susanne Reuter, Brigitte Vollmar, Gerardo Tusman, Sven Pulletz, Stephan Böhm, Amelie Zitzmann, Daniel A Reuter, Andy Adler
Since pulse wave transit time (PWTT) shortens as pulmonary artery pressure (PAP) increases it was suggested as a potential non-invasive surrogate for PAP. The state of tidal lung filling is also known to affect PWTT independently of PAP. The aim of this retrospective analysis was to test whether respiratory gating improved the correlation coefficient between PWTT and PAP. In each one of five anesthetized and mechanically ventilated pigs two high-fidelity pressure catheters were placed, one directly behind the pulmonary valve, and the second one in a distal branch of the pulmonary artery...
February 29, 2024: Physiological Measurement
https://read.qxmd.com/read/38392011/arterial-pulse-wave-velocity-signal-reconstruction-using-low-sampling-rates
#6
JOURNAL ARTICLE
Sungcheol Hong, Gerard Coté
Pulse Wave Velocity (PWV) analysis is valuable for assessing arterial stiffness and cardiovascular health and potentially for estimating blood pressure cufflessly. However, conventional PWV analysis from two transducers spaced closely poses challenges in data management, battery life, and developing the device for continuous real-time applications together along an artery, which typically need data to be recorded at high sampling rates. Specifically, although a pulse signal consists of low-frequency components when used for applications such as determining heart rate, the pulse transit time for transducers near each other along an artery takes place in the millisecond range, typically needing a high sampling rate...
February 8, 2024: Biosensors
https://read.qxmd.com/read/38281742/optimization-and-validation-of-a-suprasystolic-brachial-cuff-based-method-for-noninvasively-estimating-central-aortic-blood-pressure
#7
JOURNAL ARTICLE
Xujie Zhang, Yue Wang, Zhaofang Yin, Fuyou Liang
Clinical studies have extensively demonstrated that central aortic blood pressure (CABP) has greater clinical significance in comparison with peripheral blood pressure. Despite the existence of various techniques for noninvasively measuring CABP, the clinical applications of most techniques are hampered by the unsatisfactory accuracy or large variability in measurement errors. In this study, we proposed a new method for noninvasively estimating CABP with improved accuracy and reduced uncertain errors. The main idea was to optimize the estimation of the pulse wave transit time from the aorta to the occluded lumen of the brachial artery under a suprasystolic cuff by identifying and utilizing the characteristic information of the cuff oscillation wave, thereby improving the accuracy and stability of the CABP estimation algorithms under various physiological conditions...
January 28, 2024: International Journal for Numerical Methods in Biomedical Engineering
https://read.qxmd.com/read/38252371/reconstructive-interpolation-for-pulse-wave-estimation-to-improve-local-pwv-measurement-of-carotid-artery
#8
JOURNAL ARTICLE
Ouyang Gu, Bingbing He, Li Xiong, Yufeng Zhang, Zhiyao Li, Xun Lang
Ultrasonic transit time (TT)-based local pulse wave velocity (PWV) measurement is defined as the distance between two beam positions on a segment of common carotid artery (CCA) divided by the TT in the pulse wave propagation. However, the arterial wall motions (AWMs) estimated from ultrasonic radio frequency (RF) signals with a limited number of frames using the motion tracking are typically discrete. In this work, we develop a method involving motion tracking combined with reconstructive interpolation (MTRI) to reduce the quantification errors in the estimated PWs, and thereby improve the accuracy of the TT-based local PWV measurement for CCA...
January 22, 2024: Medical & Biological Engineering & Computing
https://read.qxmd.com/read/38180702/pulsatile-features-of-major-arteries-in-rats-during-hypotension-caused-by-acute-blood-loss
#9
JOURNAL ARTICLE
S V Revenko, L N Tikhomirova, I Yu Gavrilov, Yu V Egorov, E G Popov, I A Tarakanov
The study examined the modes of pulsations of the femoral and carotid arteries of rats in situ (n=14) during acute blood loss, which sequentially caused a deep BP drop, cardiac and respiration arrest, and termination of ECG signals. When BP dropped to 19 (13; 26) mm Hg, the mechanosensitivity of passively pulsing arteries determined by the ratio of the swing range of electroimpedance oscillations of arterial segment to pulse pressure increased by 3.2 (2 ; 4) times (p<0.05). During the decrease of BP to the threshold value of 13 (8; 15) mm Hg, the arterial pulsing mode changed from passive to intermediate and then to the active one characterized by constriction of arterial segment in response to systolic elevation of BP...
January 5, 2024: Bulletin of Experimental Biology and Medicine
https://read.qxmd.com/read/38179863/mri-assessment-of-cerebral-white-matter-microvascular-hemodynamics-across-the-adult-lifespan
#10
JOURNAL ARTICLE
Nikou L Damestani, John Jacoby, Christa B Michel, Barnaly Rashid, David H Salat, Meher R Juttukonda
BACKGROUND: Changes in cerebral hemodynamics with aging are important for understanding age-related variation in neuronal health. While many prior studies have focused on gray matter, less is known regarding white matter due in part to measurement challenges related to the lower vascular density in white matter. PURPOSE: To investigate the impact of age and sex on white matter hemodynamics in a Human Connectome Project in Aging (HCP-A) cohort using tract-based spatial statistics (TBSS)...
January 5, 2024: Journal of Magnetic Resonance Imaging: JMRI
https://read.qxmd.com/read/38083039/camera-wavelength-selection-for-multi-wavelength-pulse-transit-time-based-blood-pressure-monitoring
#11
JOURNAL ARTICLE
Yukai Huang, Dongmin Huang, Jia Huang, Hongzhou Lu, Min He, Wenjin Wang
Multi-wavelength pulse transmit time (MV-PTT) is a potential tool for remote blood pressure (BP) monitoring. It uses two wavelengths, typically green (G) and near-infrared (NIR), that have different skin penetration depths to measure the PTT between artery and arterioles of a single site of the skin for BP estimation. However, the impact of wavelength selection for MV-PTT based BP calibration is unknown. In this paper, we explore the combination of different wavelengths of camera photoplethysmography for BP measurement using a modified narrow-band camera centered at G-550/R-660/NIR-850 nm, especially focused on the comparison between G-R (full visible) and G-NIR (hybrid)...
July 2023: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://read.qxmd.com/read/38083024/development-of-a-ppg-based-hardware-and-software-system-deployable-on-elbow-and-thumb-for-real-time-estimation-of-pulse-transit-time
#12
JOURNAL ARTICLE
Andrea Valerio, Adhurim Hajzeraj, Omid Varnosfaderani Talebi, Marco Belcastro, Salvatore Tedesco, Danilo Demarchi, Brendan O'Flynn
Blood pressure (BP) is a vital parameter used by clinicians to diagnose issues in the human cardiovascular system. Cuff-based BP devices are currently the standard method for on-the-spot and ambulatory BP measurements. However, cuff-based devices are not comfortable and are not suitable for long-term BP monitoring. Many studies have reported a significant correlation between pulse transit time (PTT) with blood pressure. However, this relation is impacted by many internal and external factors which might lower the accuracy of the PTT method...
July 2023: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://read.qxmd.com/read/38083013/enhancing-multichannel-laser-doppler-vibrometry-signals-with-application-to-carotid-femoral-pulse-transit-time-estimation
#13
JOURNAL ARTICLE
Simeon Beeckman, Yanlu Li, Soren Aasmul, Roel Baets, Pierre Boutouyrie, Patrick Segers, Nilesh Madhu
Pulse-wave velocity (PWV) can be used to quantify arterial stiffness, allowing for a diagnosis of this condition. Multi-beam laser-doppler vibrometry offers a cheap, non-invasive and user-friendly alternative to measuring PWV, and its feasibility has been previously demonstrated in the H2020 project CARDIS. The two handpieces of the prototype CARDIS device measure skin displacement above main arteries at two different sites, yielding an estimate of the pulse-transit time (PTT) and, consequently, PWV. The presence of multiple beams (channels) on each handpiece can be used to enhance the underlying signal, improving the quality of the signal for PTT estimation and further analysis...
July 2023: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://read.qxmd.com/read/38082929/arterial-wave-separation-analysis-and-reflection-wave-transit-time-estimation-using-a-double-rayleigh-flow-rate-model
#14
JOURNAL ARTICLE
Rahul Manoj, Aneesh S, Raj Kiran V, Nabeel P M, Mohanasankar Sivaprakasam, Jayaraj Joseph
Arterial pulse wave separation analysis (WSA) requires simultaneously measured pressure and flow rate waveform from the same arterial site. Modelling approaches to flow rate waveforms offers a methodological and instrumentational advantage. However, current techniques are limited to the aortic site. For non-aortic sites such as carotid artery, modelling methods that were developed for aortic sites are not likely to capture the intrinsic differences in the carotid flow rate. In this work, a double-Rayleigh flow rate model for the carotid artery is developed to separate the forward and backward pressure waves using WSA (DRMWSA)...
July 2023: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://read.qxmd.com/read/38082638/ultrasound-for-venous-local-pulse-wave-velocity-comparison-of-pulse-transit-time-methods
#15
JOURNAL ARTICLE
Navya Rose George, Rahul Manoj, Raj Kiran V, Nabeel P M, Mohanasankar Sivaprakasam, Jayaraj Joseph
Venous pulse wave velocity (vPWV) is a potential marker for determining the state of venous hemodynamics, venosclerosis, and vascular filling. Although there have been several studies on pulse wave velocity through blood vessels, the majority have focused on arteries, with only limited studies on veins. To our knowledge, this study is the first to compare the local vPWV estimation metrices. An in vivo study was conducted on 10 participants where the jugular venous pulses (JVP) from two proximal sites were simultaneously acquired using a dual-element high frame rate system...
July 2023: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://read.qxmd.com/read/38071517/impact-of-cord-clamping-on-haemodynamic-transition-in-term-newborn-infants
#16
JOURNAL ARTICLE
Roberto Chioma, Daragh Finn, David B Healy, Ita Herlihy, Vicki Livingstone, Jurate Panaviene, Eugene M Dempsey
OBJECTIVE: To assess the haemodynamic consequences of cord clamping (CC) in healthy term infants. DESIGN: Cohort study. SETTING: Tertiary maternity hospital. PATIENTS: 46 full-term vigorous infants born by caesarean section. INTERVENTIONS: Echocardiography was performed before CC, immediately after CC and at 5 min after birth. MAIN OUTCOME MEASURES: Pulsed wave Doppler-derived cardiac output and the pulmonary artery acceleration time indexed to the right ventricle ejection time were obtained...
December 6, 2023: Archives of Disease in Childhood. Fetal and Neonatal Edition
https://read.qxmd.com/read/37985616/novel-peripheral-perfusion-dynamics-indices-for-detecting-and-grading-arterial-stenosis
#17
JOURNAL ARTICLE
Tomer Joshua Heitner, Amit Livneh, Amir Landesberg
PURPOSE: Peripheral artery disease causes severe morbidity, especially in diabetics and the elderly. There is a need for accurate noninvasive detection of peripheral arterial stenosis. The study has tested the hypothesis that arterial stenosis and the associated adaptation of the downstream circulation yield characteristic changes in the leg perfusion dynamics that enable early diagnosis, utilizing impedance plethysmography. METHODS: The arterial perfusion dynamic was derived from impedance plethysmography (IPG)...
November 20, 2023: Cardiovascular Engineering and Technology
https://read.qxmd.com/read/37972587/pulmonary-transit-time-derived-from-first-pass-perfusion-cardiac-mr-imaging-a-potential-new-marker-for-cardiac-involvement-and-prognosis-in-light-chain-amyloidosis
#18
JOURNAL ARTICLE
Keying Bi, Ke Wan, Yuanwei Xu, Jie Wang, Weihao Li, Jiajun Guo, Ziqian Xu, Yangjie Li, Qiao Deng, Wei Cheng, Jiayu Sun, Yucheng Chen
BACKGROUND: First-pass perfusion cardiac MR imaging could reflect pulmonary hemodynamics. However, the clinical value of pulmonary transit time (PTT) derived from first-pass perfusion MRI in light-chain (AL) amyloidosis requires further evaluation. PURPOSE: To assess the clinical and prognostic value of PTT in patients with AL amyloidosis. STUDY TYPE: Prospective observational study. POPULATION: 226 biopsy-proven systemic AL amyloidosis patients (age 58...
November 16, 2023: Journal of Magnetic Resonance Imaging: JMRI
https://read.qxmd.com/read/37904579/the-relationship-of-systemic-and-pulmonary-arterial-parameters-with-hfpef-scores-h-2-fpef-hfa-peff-and-diastolic-dysfunction-parameters-in-heart-failure-patients-with-preserved-ejection-fraction
#19
JOURNAL ARTICLE
Yunus Emre Yavuz, Ahmet Soylu, Ahmet Seyfettin Gürbüz
OBJECTIVE: We aimed to show the relationship between pulmonary pulse wave transit time (pPTT), pulmonary artery stiffness (PAS), and aortic stiffness parameters measured by non-invasive methods, HFpEF patients, and HFpEF scores (H2 FPEF, HFA-PEFF). METHOD: A total of 101 patients were included in our study, 52 of whom were HFpEF patients and 49 were control groups without heart failure. Echocardiographic parameters for PAS and pPTT were calculated, along with diastolic parameters that support the diagnosis of HFpEF...
October 31, 2023: Journal of Clinical Ultrasound: JCU
https://read.qxmd.com/read/37901133/utilizing-reduced-labeled-proton-clearance-to-identify-preclinical-alzheimer-disease-with-3d-asl-mri
#20
Charles R Joseph, Alec Kreilach, Victoria Ashley Reyna, Thomas Ashton Kepler, Brittany Viola Taylor, Jubin Kang, Dallas McCorkle, Nicholas L Rider
Addressing the seminal pathophysiology in Alzheimer disease (AD) is the next logical focus for effective intervention, given the initial disappointing and more recent possibly encouraging results of monoclonal antibody trials. Endothelial cell dysfunction-induced blood-brain barrier leak with associated prolonged capillary mean transit time (cMTT) and glymphatic outflow dysfunction is the most proximal events in the degeneration cascade. Sensitive and reproducible markers are required to both identify early disease and assess future treatment trial outcomes...
2023: Case Reports in Neurology
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