51,869 results match your criteria artery doppler


The Penile Duplex Ultrasound: how and when to perform it?

Andrology 2021 May 6. Epub 2021 May 6.

Department of Clinical and Experimental Medicine, University of Catania, Catania, Italy.

Background: Because it is a superficial structure, the penis is ideally suited to ultrasound imaging. A number of disease processes, including Peyronie's disease, penile fractures and tumors, are clearly visualized with ultrasound. Baseline and dynamic assessment of cavernosal arterial changes after pharmaco-stimulation with alprostadil allows standardized diagnosis of arterial and venogenic causes of erectile dysfunction (ED). Read More

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Xenotransplantation of neonatal porcine bone marrow-derived mesenchymal stem cells improves murine hind limb ischemia through lymphangiogenesis and angiogenesis.

Xenotransplantation 2021 May 6:e12693. Epub 2021 May 6.

Department of Regenerative Medicine & Transplantation, Faculty of Medicine, Fukuoka University, Fukuoka, Japan.

Background: The clinical utility of stem cell therapy for peripheral artery disease has not been fully discussed, and one obstacle is limited donor supplies. In this study, we attempted to rescue mouse ischemic hind limb by xenotransplantation of neonatal porcine bone marrow-derived mesenchymal stem cells (npBM-MSCs).

Methods: Neonatal porcine bone marrow-derived mesenchymal stem cells were transplanted to ischemic hind limbs of male C57BL/6J mice (npBM-MSCs group). Read More

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Arterial Doppler Waveforms Are Independently Associated With Maximal Walking Distance in Suspected Peripheral Artery Disease Patients.

Front Cardiovasc Med 2021 20;8:608008. Epub 2021 Apr 20.

Vascular Medicine Unit, CHU Rennes, Rennes, France.

Arterial Doppler waveform recordings are commonly used to assess lower extremity arterial disease (LEAD) severity. However, little is known about the relationship between arterial Doppler waveform profiles and patients' walking capacity. The purpose of this study was to assess whether arterial Doppler waveforms are independently associated with maximal walking distance (MWD) in patients experiencing exertional limb symptoms. Read More

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Endoscopic Endonasal Surgery of a Large Vidian Nerve Schwannoma With Preparation for Avoiding Major Vascular Injury.

Cureus 2021 Mar 31;13(3):e14230. Epub 2021 Mar 31.

Otolaryngology, Head and Neck Surgery, Graduate School of Medicine, Kyoto University, Kyoto, JPN.

Vidian nerve schwannomas are extremely rare, and their surgical management requires an awareness of the surrounding vascular and nervous systems, including the internal carotid artery. Herein, we report a case of a vidian nerve schwannoma that was successfully removed using an endoscopic endonasal approach in a 21-year-old patient who presented with lacrimal hyposecretion. Imaging revealed a large mass extending to the middle cranial fossa posteriorly, to the pterygopalatine fossa laterally, and to the sphenoid sinus medially. Read More

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ACR Appropriateness Criteria® Renal Failure.

J Am Coll Radiol 2021 May;18(5S):S174-S188

Specialty Chair, University of Alabama at Birmingham, Birmingham, Alabama, Chair, ACR Appropriateness Committee.

Renal failure can be divided into acute kidney injury and chronic kidney disease. Both are common and result in increased patient morbidity and mortality. The etiology is multifactorial and differentiation of acute kidney injury from chronic kidney disease includes clinical evaluation, laboratory tests, and imaging. Read More

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Selective Angiography to Detect Anterior Spinal Artery Stenosis in Thoracic Ossification of the Posterior Longitudinal Ligament.

Asian Spine J 2021 May 7. Epub 2021 May 7.

Department of Orthopedic Surgery, Hamamatsu University School of Medicine, Hamamatsu, Japan.

Study Design: Single-center prospective study.

Purpose: To investigate anterior spinal artery (ASA) status using preoperative selective angiography in patients undergoing surgery for thoracic ossification of the posterior longitudinal ligament (T-OPLL).

Overview Of Literature: Surgery for T-OPLL has a high risk of neurological complications, which might be associated with insufficient spinal cord blood flow. Read More

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A Guide to Doppler Ultrasound Analysis of the Face in Cosmetic Medicine. Part 2: Vascular Mapping.

Aesthet Surg J 2021 May 5. Epub 2021 May 5.

Duplex mode ultrasound imaging can detect the course of the main vascular structures in the face, which are known to be subject to variation. Once duplex mapping has been performed, measures can be taken to prevent injection into an artery, thereby avoiding skin necrosis or, worse, vision loss. For this reason, in particular, we predict that in the coming years sonography will become standard equipment in the offices of cosmetic doctors. Read More

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Early Hepatic Artery Thrombosis After Living Donor Liver Transplant: A 13-Year Single-Center Experience in Jordan.

Exp Clin Transplant 2021 May 6. Epub 2021 May 6.

From the Hepatology, Gastroenterology, and Hepatobiliary/Transplant Unit, Jordan Hospital, Amman, Jordan.

Objectives: Early hepatic artery thrombosis is a serious complication that may follow living donor liver transplant. Acute graft loss and patient morbidity and mortality are possible consequences. The therapeutic algorithm includes surgical or interventional revascularization, conservative approaches, or retransplantation. Read More

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Pulse wave imaging coupled with vector flow mapping: A phantom, simulation and in vivo study.

IEEE Trans Ultrason Ferroelectr Freq Control 2021 May 5;PP. Epub 2021 May 5.

Pulse wave imaging (PWI) is an ultrasound imaging modality that estimates the wall stiffness of an imaged arterial segment by tracking the pulse wave propagation. The aim of the present study is to integrate PWI with vector flow imaging, enabling simultaneous and co-localized mapping of vessel wall mechanical properties and 2-D flow patterns. Two vector flow imaging techniques were implemented using the PWI acquisition sequence: 1) multi-angle vector Doppler, and 2) a cross correlation based vector flow imaging (CC VFI) method. Read More

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Intracranial dolichoectasia in patients with symptomatic intracranial atherosclerotic disease: Results from the MYRIAD study.

J Neuroimaging 2021 May 4. Epub 2021 May 4.

Department of Neurology, University of Miami Miller School of Medicine, Miami, Florida, USA.

Background And Purpose: It is unknown whether intracranial atherosclerotic disease (ICAD), in addition to causing stenosis, also associates with abnormal arterial enlargement, a condition known as intracranial dolichoectasia (IDE). Across symptomatic ICAD patients, we aim to determine IDE prevalence and IDE impact on cerebral hemodynamics and recurrent cerebral ischemia.

Methods: We analyzed 98 participants (mean age 63. Read More

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Quantitative Assessment of Ensemble Coherency in Contrast-free Ultrasound Microvasculature Imaging.

Med Phys 2021 May 3. Epub 2021 May 3.

Department of Radiology, Mayo Clinic College of Medicine and Science, Rochester, Minnesota, 55902, United States.

Purpose: Contrast-free visualization of microvascular blood flow (MBF) using ultrasound can play a valuable role in diagnosis and detection of diseases. In this study, we demonstrate the importance of quantifying ensemble coherence for robust MBF imaging. We propose a novel approach to quantify ensemble coherence by estimating the local spatiotemporal correlation (LSTC) image, and evaluate its efficacy through simulation and in vivo studies. Read More

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Thrombolysis of Pulmonary Emboli via Endobronchial Ultrasound-Guided Transbronchial Needle Injection.

Ann Thorac Surg 2020 Oct 24. Epub 2020 Oct 24.

Division of Thoracic Surgery, Toronto General Hospital, University Health Network, Ontario, Canada. Electronic address:

Background: Endobronchial ultrasound-guided transbronchial needle injection (EBUS-TBNI) is a novel technique for treating peribronchial targets. The aim of this study was to evaluate preliminary feasibility of thrombolysis of pulmonary emboli via EBUS-TBNI.

Methods: Yorkshire pigs (30-48 kg) were anesthetized and mechanically ventilated. Read More

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October 2020

Impact of acute changes in blood pressure and arterial stiffness on cerebral pulsatile hemodynamics in young and middle-aged adults.

Exp Physiol 2021 May 2. Epub 2021 May 2.

Department of Kinesiology & Nutrition, University of Illinois at Chicago.

New Findings: What is the central question of this study? Examine whether cerebrovascular pulsatility responds differently to acute increases in arterial stiffness in middle-aged compared to young adults. What is the main finding and its importance? Compared to young adults, middle-aged adults exhibited similar changes in cerebral pulsatile damping despite attenuated changes in carotid diameter and cerebrovascular pulsatility during blood pressure-dependent, but not blood pressure-independent, increases in large artery stiffness.

Abstract: Acutely manipulating arterial stiffness through interventions that increase sympathetic activity may provoke cerebral pulsatility and damping, and reveal whether cerebrovascular hemodynamics respond differently in middle-age adults to transient elevations in arterial stiffness. Read More

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The Prevalence, Distribution, and Extent of Subclinical Atherosclerosis and Its Relation With Serum Uric Acid in Hypertension Population.

Front Cardiovasc Med 2021 15;8:638992. Epub 2021 Apr 15.

Department of Cardiology, First Affiliated Hospital of Dalian Medical University, Dalian, China.

Data are limited on the prevalence, distribution, and extent of subclinical atherosclerosis (SCA) in populations with primary hypertension and an in-depth evaluation is required to explore the impact of elevated serum uric acid (SUA) levels on the systemic extent of SCA. A total of 1,534 individuals with blood pressure-controlled primary hypertension registered from January 1, 2015 to May 31, 2018 were included. The systemic extent and risk factors of SCA in the carotid, coronary, thoracic, and renal territories were investigated by Doppler ultrasound and computed tomography. Read More

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Changes in left ventricular and atrial mechanics and function after dialysis in patients with end-stage renal disease.

Quant Imaging Med Surg 2021 May;11(5):1899-1908

Department of Geriatrics, The First Affiliated Hospital of Nanjing Medical University, Nanjing, China.

Background: Hemodialysis (HD) can influence end-stage renal disease (ESRD) patients' circulatory system. The present study aimed to evaluate the effect of volume depletion on left ventricular (LV) and left atrial (LA) function and determine the volume-independent parameters before and after HD in patients with ESRD.

Methods: Between January 2018 and January 2019, we recruited long-term HD patients (n=40, 51. Read More

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Testicular shape, scrotal skin thickness, and testicular artery blood flow changes in bulls of different ages.

Reprod Domest Anim 2021 May 1. Epub 2021 May 1.

Deparment of Animal Science, State University of Londrina, Rd. Celso Garcia Cid 445, Km 380 Campus Universitário, Londrina, Paraná, 86051-990, Brazil.

The aim of this study was to compare the biometric testicular characteristics, skin thickness, and hemodynamics of the testicular artery of 12 and 24 months old bulls using Doppler ultrasonography, the study was conducted using 48 indicus-taurus animals. The scrotal circumference and biometry characteristics of the bulls were measured to calculate the testicular volume. Doppler ultrasonography was used to obtain the hemodynamic values of the testicular artery. Read More

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Differential associations of ankle and brachial blood pressures with diabetes and cardiovascular diseases: cross-sectional study.

Sci Rep 2021 Apr 30;11(1):9406. Epub 2021 Apr 30.

NHS England & NHS Improvement (North East and Yorkshire), Quarry Hill, Leeds, LS2 7UE, UK.

Increased brachial systolic blood-pressure (BP) predicts diabetes (T2DM) but is not fully effective. Value of absolute ankle systolic BP for T2DM compared to brachial systolic BP is not known. Our objectives were to assess independent relationships of ankle-systolic BP with T2DM and cardiovascular disease in Europeans and south Asians. Read More

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Retrobulbar blood flow in rat eyes during acute elevation of intraocular pressure.

Exp Eye Res 2021 Apr 28;207:108606. Epub 2021 Apr 28.

F.L. Lizzi Center for Biomedical Engineering, Riverside Research, New York, NY, USA.

Most studies of the effect of acute elevation of intraocular pressure (IOP) on ocular blood-flow have utilized optical coherence tomography (OCT) to characterize retinal and choroidal flow and vascular density. This study investigates the effect of acute IOP elevation on blood flow velocity in the retrobulbar arteries and veins supplying and draining the eye, which, unlike the retinal and choroidal vasculature, are not directly compressed as IOP is increased. By cannulation of the anterior chamber of 20 Sprague-Dawley rats, we increased IOP in 10 mmHg steps from 10 to 60 mmHg and returned to 10 mmHg. Read More

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Evaluation of ultrasonographic optic nerve sheath diameter and central retinal artery Doppler indices by point-of-care ultrasound in pediatric patients with increased intracranial pressure.

Turk J Pediatr 2021 ;63(2):300-306

Departments of Pediatric Neurology, Çukurova University Faculty of Medicine, Adana, Turkey.

Background: Measurement of the optic nerve sheath diameter (ONSD) with point-of-care ultrasound (POCUS) is a non-invasive and radiation-free technique that can be used to assess increased intracranial pressure (ICP). Ophthalmic artery and central retinal artery Doppler indices can be used like transcranial Doppler to evaluate increased ICP. This study aims to examine the diagnostic value of ONSD measurements and central retinal artery Doppler indices in the evaluation of pediatric patients with increased ICP. Read More

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January 2021

Effects of acute alcohol consumption on neuronal activity and cerebral vasomotor response.

Neurol Sci 2021 Apr 30. Epub 2021 Apr 30.

Department of Neurology, Faculty of Medicine, University of Debrecen, Móricz Zsigmond str. 22., Debrecen, H-4032, Hungary.

Introduction: In the majority of European countries, driving after drinking small-moderate amount of alcohol is legal. Motivated by our previous studies on cerebral hemodynamics, we aimed to study whether a small-moderate blood alcohol content (BAC), at which driving is legal in some countries (0.8 g/L), influences the neuronal activity, neurovascular coupling, and cerebral vasoreactivity. Read More

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Handheld Doppler Localization of the Angular Artery to Reduce Intravascular Injection in Tear Trough Rejuvenation.

Dermatol Surg 2021 Apr 27. Epub 2021 Apr 27.

Maryland Laser, Skin and Vein Institute, Hunt Valley, Maryland.

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Ultrasound Methods in the Evaluation of Atherosclerosis: From Pathophysiology to Clinic.

Biomedicines 2021 Apr 13;9(4). Epub 2021 Apr 13.

Research Center for Functional Genomics, Biomedicine and Translational Medicine, Iuliu Hatieganu University of Medicine and Pharmacy, 23 Marinescu Street, 400337 Cluj-Napoca, Romania.

Atherosclerosis is a key pathological process that causes a plethora of pathologies, including coronary artery disease, peripheral artery disease, and ischemic stroke. The silent progression of the atherosclerotic disease prompts for new surveillance tools that can visualize, characterize, and provide a risk evaluation of the atherosclerotic plaque. Conventional ultrasound methods-bright (B)-mode US plus Doppler mode-provide a rapid, cost-efficient way to visualize an established plaque and give a rapid risk stratification of the patient through the Gray-Weale standardization-echolucent plaques with ≥50% stenosis have a significantly greater risk of ipsilateral stroke. Read More

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Use of the Renal Artery Doppler to Identify Small for Gestational Age Fetuses at Risk for Adverse Neonatal Outcomes.

J Clin Med 2021 Apr 23;10(9). Epub 2021 Apr 23.

Department of Women and Child Heath, University of Padua School of Medicine, 35122 Padova, Italy.

Objective: To measure the sensitivity and positive predictive value (PPV) for an adverse neonatal outcome among growth-restricted fetuses (FGR) comparing the cerebral-placental ratio (CPR) with the cerebral-renal ratio (CRR).

Methods: Retrospective analysis of 92 women who underwent prenatal ultrasound at the University of Maryland and the University of Padua. Renal, middle cerebral and umbilical artery Doppler waveforms were recorded for all scans during the third trimester. Read More

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An Exaggerated Rise in Pulmonary Artery Pressure in a High-Altitude Dweller during the Cold Season.

Int J Environ Res Public Health 2021 Apr 10;18(8). Epub 2021 Apr 10.

Department of Mountain and Sleep Medicine and Pulmonary Hypertension, National Center of Cardiology and Internal Medicine, Bishkek 720040, Kyrgyzstan.

Chronic hypoxia-induced sustained pulmonary vasoconstriction and vascular remodeling lead to mild-to-moderate elevation of pulmonary artery pressure in high-altitude residents. However, in some of them, severe pulmonary hypertension may develop. Besides hypoxia, high-altitude residents also face other environmental challenges such as low ambient temperatures. Read More

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Human-Induced Pluripotent Stem-Cell-Derived Smooth Muscle Cells Increase Angiogenesis to Treat Hindlimb Ischemia.

Cells 2021 Apr 2;10(4). Epub 2021 Apr 2.

Vascular Biology & Therapeutics Program, Yale School of Medicine, New Haven, CT 06519, USA.

Induced pluripotent stem cells (iPSC) represent an innovative, somatic cell-derived, easily obtained and renewable stem cell source without considerable ethical issues. iPSC and their derived cells may have enhanced therapeutic and translational potential compared with other stem cells. We previously showed that human iPSC-derived smooth muscle cells (hiPSC-SMC) promote angiogenesis and wound healing. Read More

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Cesarean Scar Ectopic Pregnancy-Case Series: Treatment Decision Algorithm and Success with Medical Treatment.

Medicina (Kaunas) 2021 Apr 8;57(4). Epub 2021 Apr 8.

FEA Obstetric and Gynecology Hospital Regional Materno Infantil, C.P.29011 Málaga, Spain.

: Cesarean scar ectopic pregnancies are a rare form of extrauterine pregnancies, yet their incidence has increased along with the rise in the number of cesarean deliveries. As with other ectopic pregnancies, cesarean scar ectopic pregnancies pose a greater risk for maternal hemorrhage and ultimately maternal mortality. : We present a series of clinical cases of cesarean scar ectopic pregnancy diagnosed by transvaginal ultrasonography. Read More

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Long-Term Clinical Outcomes and Carotid Ultrasound Follow-Up of Transcarotid TAVI. Prospective Single-Center Registry.

J Clin Med 2021 Apr 4;10(7). Epub 2021 Apr 4.

Division of Cardiology and Structural Heart Diseases, Medical University of Silesia, 40-007 Katowice, Poland.

This study aimed to prospectively evaluate the safety and long-term clinical outcomes of cerebral-oximetry-guided transcarotid transcatheter aortic valve implantation (TC-TAVI) with systematic follow-up with carotid ultrasound. Thirty-three TCTAVI procedures were performed in our center from 2017 to 2019. Our analysis includes in-hospital outcomes and long-term follow-up data on mortality, echocardiographic parameters, carotid Doppler ultrasound, and VARC-2 defined clinical events. Read More

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Contrasting Measures of Cerebrovascular Reactivity Between MRI and Doppler: A Cross-Sectional Study of Younger and Older Healthy Individuals.

Front Physiol 2021 12;12:656746. Epub 2021 Apr 12.

Centre for Human Brain Health, University of Birmingham, Birmingham, United Kingdom.

Cerebrovascular reactivity (CVR) is used as an outcome measure of brain health. Traditionally, lower CVR is associated with ageing, poor fitness and brain-related conditions (e.g. Read More

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Feasibility of fetal left modified myocardial performance index in twin anemia polycythemia sequence and perinatal outcomes after antenatal intervention.

J Matern Fetal Neonatal Med 2021 Apr 28:1-8. Epub 2021 Apr 28.

Department of Obstetrics and Gynecology, University of Ulsan College of Medicine, Asan Medical Center, Seoul, Republic of Korea.

Objective: To evaluate the feasibility and clinical value of fetal left modified myocardial performance index (Mod-MPI) in assessment and management of prenatal twin anemia polycythemia sequence (TAPS).

Methods: We retrospectively reviewed fetuses with TAPS diagnosed prenatally between 2015 and 2019 at Asan Medical Center. Doppler ultrasound evaluation including the peak systolic velocity (PSV) of the middle cerebral artery (MCA) and fetal echocardiography including left Mod-MPI were evaluated and followed up after antenatal management. Read More

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[Effect of combination of acupuncture and psychological intervention on attention, response inhibition and cerebral blood flow in children with attention deficit hyperactivity disorder].

Zhongguo Zhen Jiu 2021 Apr;41(4):400-4

Department of Pediatrics, Qingzhou Municipal Chinese Medicine Hospital of Shandong Province.

Objective: To observe the clinical curative effect on attention deficit hyperactivity disorder (ADHD) and explore the relevant mechanism of acupuncture in treatment.

Methods: A total of 100 ADHD children were randomized into an observation group (50 cases, 2 cases dropped off) and a control group (50 cases, 1 case dropped off). In the control group, the routine psychological intervention was used. Read More

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