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Resistive index doppler

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https://www.readbyqxmd.com/read/29450973/difference-between-renal-and-splenic-resistive-index-as-a-novel-criterion-in-doppler-evaluation-of-renal-artery-stenosis
#1
Clemens Grupp, Michael J Koziolek, Manuel Wallbach, Kerstin Hoxhold, Gerhard A Müller, Carsten Bramlage
Detection of renal artery stenosis (RAS) using Doppler is difficult to evaluate, particularly under conditions such as bilateral RAS or difficultly accessible renal arteries (RA). The objective of the present study was to assess the utility of splenic arterial compared to renal flow as an additional parameter in the Doppler evaluation of RAS. The difference between the resistive indices (RI) determined in renal and splenic parenchymal arteries (ΔRI K-S ) was evaluated in 181 hypertensive subjects without any evidence of RAS...
February 16, 2018: Journal of Clinical Hypertension
https://www.readbyqxmd.com/read/29442245/retrobulbar-and-intraocular-blood-flow-in-anterior-ischaemic-optic-neuropathy-are-linked-to-the-functional-impairment
#2
David Kuerten, Matthias Fuest, Marion Bienert, Niklas Plange
PURPOSE: Evaluation of ocular haemodynamics in patients with acute non-arteritic anterior ischaemic optic neuropathy (NAION) by colour Doppler imaging and fluorescein angiography and correlation of blood flow parameters to visual field loss and visual acuity. METHODS: Blood flow velocities (peak systolic velocity (PSV), end-diastolic velocity (EDV)) of the ophthalmic artery (OA), central retinal artery (CRA) and nasal and temporal posterior ciliary arteries (PCAs) were measured via colour Doppler imaging...
February 13, 2018: International Ophthalmology
https://www.readbyqxmd.com/read/29441202/pulse-wave-doppler-ultrasound-of-testicular-arteries-and-their-relationship-with-semen-characteristics-in-healthy-bulls
#3
Alessia Gloria, Augusto Carluccio, Laura Wegher, Domenico Robbe, Claudio Valorz, Alberto Contri
Background: Semen evaluation is used to estimate the testicular function. In bulls, the spermatozoa present in the ejaculate are the result of a process that begun more than 2 mo earlier, bequeathing a delayed depiction of the actual function of the testis. Since testis vascularization might be critical for the gonad function, selected pulse wave Doppler ultrasound parameters were assessed in this study, for instance the peak systolic velocity, the end diastolic velocity and the resistive index of the testicular artery along the spermatic cord, the marginal portion of the testicular artery and the intratesticular branches of the testicular artery both in healthy adult and young bulls...
2018: Journal of Animal Science and Biotechnology
https://www.readbyqxmd.com/read/29437882/decidual-regulation-of-trophoblast-is-altered-in-pregnancies-at-risk-of-pre-eclampsia
#4
Laura B James-Allan, Guy StJ Whitley, Karin Leslie, Alison E Wallace, Judith E Cartwright
Successful implantation and placentation are dependent on the interaction between decidual stromal cells (DSC) and extravillous trophoblast (EVT) cells. The extent of trophoblast invasion relies on communication between the placenta and maternal decidua. The cyclical process of decidualisation induces a transformation of endometrial fibroblasts to secretory DSC; these secreted products have many functions including the control of trophoblast invasion. Inadequate trophoblast invasion and remodelling of the uterine vessels (the spiral arteries) are associated with pregnancy disorders such as pre-eclampsia...
February 7, 2018: Journal of Molecular Endocrinology
https://www.readbyqxmd.com/read/29434865/diagnostic-evaluations-of-ultrasound-and-magnetic-resonance-imaging-in-mammary-duct-ectasia-and-breast-cancer
#5
Lei Song, Liang Li, Bin Liu, Dexin Yu, Fengguo Sun, Mingming Guo, Zhengmin Ruan, Feixue Zhang
The objective of the present study was to evaluate the diagnostic efficiency of ultrasound (US) and magnetic resonance imaging (MRI) in the diagnosis and differential diagnosis of mammary duct ectasia (MDE) and breast cancer. This retrospective study was performed on 35 patients with MDE and 105 patients with breast cancer using US and MRI. Imaging features, semi-quantitative and quantitative parameters were analyzed to determine their diagnostic value for MDE and breast cancer. The average age of patients with breast cancer was increased compared with that of patients with MDE...
February 2018: Oncology Letters
https://www.readbyqxmd.com/read/29427619/the-association-of-aortic-valve-pathology-with-renal-resistive-index-as-a-kidney-injury-biomarker
#6
Benjamin Y Andrew, Anne D Cherry, Jennifer N Hauck, Alina Nicoara, Cory D Maxwell, Ryan M Konoske, Annemarie Thompson, Lakshmi D Kartha, Madhav Swaminathan, Mark Stafford-Smith
BACKGROUND: Acute kidney injury (AKI) is a common serious complication following cardiac surgery. Doppler-determined renal resistive index (RRI) is a promising early AKI biomarker in this population. However, the relationship between aortic valve pathology (insufficiency and/or stenosis) and RRI is unknown. This study aimed to investigate RRI variability related to aortic valve pathology. METHODS: In a retrospective review of cardiac surgery patients, RRI and aortic valve pathology were assessed prior to cardiopulmonary bypass using transesophageal echocardiography...
February 7, 2018: Annals of Thoracic Surgery
https://www.readbyqxmd.com/read/29426978/impact-of-intracranial-artery-calcification-on-cerebral-hemodynamic-changes
#7
Xiaohong Wu, Li Wang, Jingxin Zhong, Jacky Ko, Lin Shi, Yannie Soo, Thomas Leung, Ka Sing Wong, Jill Abrigo, Xiangyan Chen
PURPOSE: Intracranial artery calcification (IAC) has been demonstrated to be correlated with ischemic stroke, cognitive decline, and other vascular events by accumulating evidences from both Western and Asian populations. The proposed study aimed to investigate its potential mechanisms by evaluating the blood flow velocity and pulsatility index (PI) of cerebral arteries. METHODS: Consecutive ischemic stroke patients admitted to the Prince of Wales Hospital were recruited after excluding those with atrial fibrillation or poor temporal window...
February 9, 2018: Neuroradiology
https://www.readbyqxmd.com/read/29422868/relationship-between-aortic-compliance-and-impact-of-cerebral-blood-flow-fluctuation-to-dynamic-orthostatic-challenge-in-endurance-athletes
#8
Tsubasa Tomoto, Tomoko Imai, Shigehiko Ogoh, Seiji Maeda, Jun Sugawara
Aorta effectively buffers cardiac pulsatile fluctuation generated from the left ventricular (LV) which could be a mechanical force to high blood flow and low-resistance end-organs such as the brain. A dynamic orthostatic challenge may evoke substantial cardiac pulsatile fluctuation via the transient increases in venous return and stroke volume (SV). Particularly, this response may be greater in endurance-trained athletes (ET) who exhibit LV eccentric remodeling. The aim of this study was to determine the contribution of aortic compliance to the response of cerebral blood flow fluctuation to dynamic orthostatic challenge in ET and age-matched sedentary (SED) young healthy men...
2018: Frontiers in Physiology
https://www.readbyqxmd.com/read/29417750/does-gradual-change-in-head-positioning-affect-cerebrovascular-physiology
#9
Man Y Lam, Victoria J Haunton, Thompson G Robinson, Ronney B Panerai
We studied cerebral blood velocity (CBV), and associated hemodynamic parameters during gradual changes in head positioning in a nonstroke group. CBV (transcranial Doppler ultrasound), beat-to-beat blood pressure (BP, Finometer), and end-tidal carbon dioxide (ETCO2 , capnography) were recorded between lying flat (0°) and sitting up (30°) head positions, in 18 volunteers (10 female, mean age, 57 ± 16 years), at two visits (12 ± 8 days). A significant reduction was found between 5-min FLAT (0°) and 5-min SIT (30°) positions in CBV (visit 1: 4...
February 2018: Physiological Reports
https://www.readbyqxmd.com/read/29393725/effects-of-laparascopic-hernia-repair-by-pirs-percutan-internal-ring-suturing-technique-on-testicular-artery-blood-supply
#10
Akgun Oral, Leyla Karaca, Ali Ahiskalioglu, Abdullah Yildiz, Murat Yigiter, Mehmet Emin Celikkaya, Temirlan Chyndolotov, Ahmet Bedii Salman
PURPOSE: Percutaneous internal ring suturing technique (PIRS) is a minimally invasive technique in pediatric inguinal hernia repair. In the present study, a negative effect on testicular blood flow using PIRS technique has been investigated. METHODS: Forty male patients were included in the study prospectively. Two groups were formed as conventional open surgery (Group I) and PIRS technique (Group II). The resistive index (RI) value of the testicular artery was measured prospectively by using SMI (superb micro-vascular imaging) software with the color doppler ultrasound technique preoperatively and postoperatively at the first month...
February 2, 2018: Journal of Investigative Surgery: the Official Journal of the Academy of Surgical Research
https://www.readbyqxmd.com/read/29390203/enos-uncoupling-a-therapeutic-target-for-ischemic-foot-of-diabetic-rat
#11
Ling Gao, Ailin Yu, Jingcheng Liu, Lina Ma, Jing Li
AIM: To determine the relationship between eNOS uncoupling and diabetic ischemic foot and whether reversing eNOS uncoupling by Dihydrofolate reductase (DHFR) transfection or folic acid (FA) supplementation can be beneficiary in diabetic ischemic foot. METHODS: The bilateral common iliac artery of diabetic rats were ligated to establish the diabetic ischemic foot animal model. DHFR transfection was implemented via femoral artery and muscle injection of in vivo transfection reagent mixture (GenEscortIII) every 4 days during the 2 weeks intervention...
February 1, 2018: Experimental and Clinical Endocrinology & Diabetes
https://www.readbyqxmd.com/read/29379243/evaluation-of-parenchymal-thyroid-diseases-with-multiparametric-ultrasonography
#12
Duzgun Yildirim, Deniz Alis, Alev Bakir, Fethi E Ustabasioglu, Cesur Samanci, Bulent Colakoglu
Aim: Differential diagnosis of parenchymal thyroid diseases by gray-scale ultrasound is quite difficult for a radiologist as the findings are very similar to each other. In this study we aimed to assess some quantitative spectral Doppler parameters, resistivity index (RI), acceleration time (AT), and quantitative elastography [shear wave velocity (SWV)] together to show their reliability for differential diagnosis of parenchymal thyroid diseases. Materials and Methods: We retrospectively reviewed findings of 227 patients (179 females, 48 males) that underwent spectral Doppler ultrasound and acoustic radiation force impulse between October 2013 and March 2016...
October 2017: Indian Journal of Radiology & Imaging
https://www.readbyqxmd.com/read/29375900/uterine-artery-doppler-velocimetry-in-hypertensive-disorder-of-pregnancy-in-nigeria
#13
Ibukun A Abidoye, Oluwagbemiga O Ayoola, Bukunmi M Idowu, Adeniyi S Aderibigbe, Olabisi M Loto
Aim of the study: To evaluate the value of uterine artery Doppler indices and waveform pattern in predicting fetuses at risk for intrauterine growth restriction in hypertensive disorders of pregnancy. Materials and methods: This was a prospective cross-sectional study including 80 pregnant subjects with hypertensive disorders of pregnancy and two control groups. Uterine artery Doppler sonography was performed in all study participants. Uterine artery Doppler indices across the groups were compared using the analysis of variance (ANOVA) while the presence of prediastolic notch was analyzed with the Chi Square test...
December 2017: Journal of Ultrasonography
https://www.readbyqxmd.com/read/29372379/effect-on-cerebral-oxygenation-of-paracetamol-for-patent-ductus-arteriosus-in-preterm-infants
#14
Carlo Dani, Chiara Poggi, Ilaria Cianchi, Iuri Corsini, Venturella Vangi, Simone Pratesi
Paracetamol seems to have similar success rates compared with indomethacin and ibuprofen in closing patent ductus arteriosus (PDA) in preterm infants, but with a better safety profile. The aim of our study was to evaluate the possible effects of paracetamol on cerebral oxygenation and cerebral blood flow velocity (CBFV). Infants with gestational age < 32 weeks with hemodynamically significant PDA (hsPDA) were prospectively studied by near infrared spectroscopy (NIRS) after the first dose of paracetamol (15 mg/kg) or ibuprofen (10 mg/kg)...
January 25, 2018: European Journal of Pediatrics
https://www.readbyqxmd.com/read/29372357/micro-ureteroscopy-vs-ureteroscopy-effects-of-miniaturization-on-renal-vascularization-and-intrapelvic-pressure
#15
Juan-Pablo Caballero-Romeu, Jua-Antonio Galán-Llopis, Federico Soria, Esther Morcillo-Martín, Pablo Caballero-Pérez, Alejandro Garcia, Julia E De La Cruz-Conty, Jesús Romero-Maroto
PURPOSE: Ureteroscopy (URS) is related to complications, as fever or postoperative urinary sepsis, due to high intrapelvic pressure (IPP) during the procedure. Micro-ureteroscopy (m-URS) aims to reduce morbidity by miniaturizing the instrument. The objective of this study is to compare IPP and changes in renal haemodynamics, while performing m-URS vs. conventional URS. METHODS: A porcine model involving 14 female pigs was used in this experimental study. Two surgeons performed 7 URS (8/9...
January 25, 2018: World Journal of Urology
https://www.readbyqxmd.com/read/29362156/value-of-contrast-enhanced-ultrasound-and-pet-ct-in-assessment-of-extramedullary-lymphoma
#16
Wenbin Jiang, Hongwei Xue, Qinqin Wang, Xiaojuan Zhang, Zhenguang Wang, Cheng Zhao
OBJECTIVE: The aim of the study was to evaluate clinical value of contrast-enhanced ultrasonography (CEUS) and PET/CT for assessment of extramedullary lymphoma, using histopathology as reference standard. METHOD: A total of 63 patients with histopathologically-confirmed extramedullary lymphoma who had underwent CEUS and PET/CT examinations of suspicious lymph nodes included in the study. CEUS patterns and parameters (arrival time, peak time and intensity, base intensity, area under the time-intensity curve, ascending and descending slopes) and PET/CT parameters including maximum standardized uptake value, mean standardized uptake value, and metabolic tumor volume (MTV) were evaluated...
February 2018: European Journal of Radiology
https://www.readbyqxmd.com/read/29352359/unilateral-lichtenstein-tension-free-mesh-hernia-repair-and-testicular-perfusion-a-prospective-control-study
#17
J Aguilar-García, H A Cano-González, M A Martínez-Jiménez, F de la Rosa-Zapata, M Sánchez-Aguilar
PURPOSE: Compare testicular perfusion between the herniated and the healthy side pre- and post-surgery. MATERIALS AND METHODS: Our study was done on patients with unilateral inguinal hernia. A Doppler ultrasound study was performed in the healthy and herniated side before surgery and 3 months after it. RESULTS: 31 patients were included, 74.2% on the right and 25.8% on the left side. When comparing the pre-surgical values of testicular resistance index from the healthy side with those on the herniated side, there was a significant difference at the spermatic cord levels (0...
January 19, 2018: Hernia: the Journal of Hernias and Abdominal Wall Surgery
https://www.readbyqxmd.com/read/29346779/predictors-of-recoverability-of-renal-function-after-pyeloplasty-in-adults-with-ureteropelvic-junction-obstruction
#18
Xiao-Dong Li, Yu-Peng Wu, Yong Wei, Shao-Hao Chen, Qing-Shui Zheng, Hai Cai, Xue-Yi Xue, Ning Xu
BACKGROUND: This study aimed to identify factors predicting the recoverability of renal function after pyeloplasty in adult patients with ureteropelvic junction obstruction. METHODS: We retrospectively reviewed 138 adults with unilateral renal obstruction-induced hydronephrosis and who underwent Anderson-Hynes dismembered pyeloplasty from January 2013 to January 2016. Hydronephrosis was classified preoperatively according to the Society for Fetal Urology (SFU) grading system...
January 18, 2018: Urologia Internationalis
https://www.readbyqxmd.com/read/29343893/assessment-of-perfusion-of-free-flaps-used-in-head-and-neck-reconstruction-using-pulsatility-index
#19
Akshay Kapoor, Malay Karmakar, Collin Roy, Kaushal Priya Anand
Objective: To detect venous or arterial obstruction in the pedicle of a free flap we can monitor resistance in the flap bed which is reflected in Pulsatility Index (PI) Therefore if we detect change in the values of the PI in these flaps then we can detect complications in flap due to vascular insufficiency early. Materials and Methods: Seven patients of Free Fibular Flap Reconstruction and ten patients of Free Radial Forearm Flap reconstruction were evaluated over a period of 18 months...
May 2017: Indian Journal of Plastic Surgery: Official Publication of the Association of Plastic Surgeons of India
https://www.readbyqxmd.com/read/29330635/hypotension-due-to-spinal-anesthesia-influences-fetal-circulation-in-primary-caesarean-sections
#20
K Lato, I Bekes, Peter Widschwendter, T W P Friedl, W Janni, F Reister, G Froeba, U Friebe-Hoffmann
PURPOSE: Hypotension due to spinal anesthesia is a well-known side effect in pregnant women receiving caesarean section. Little is known about its impact on fetal blood circulation. METHODS: 40 women with uncomplicated singleton term pregnancies prepared for caesarean section were prospectively evaluated by Doppler sonography before and immediately after spinal anesthesia. RESULTS: In 90% of the women, blood pressure significantly decreased after spinal anesthesia and 42...
January 12, 2018: Archives of Gynecology and Obstetrics
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