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https://www.readbyqxmd.com/read/29156225/differences-between-auditory-frequency-following-responses-and-onset-responses-intracranial-evidence-from-rat-inferior-colliculus
#1
Qian Wang, Liang Li
A periodic sound, such as a pure tone, evokes both transient onset field-potential responses and sustained frequency-following responses (FFRs) in the auditory midbrain, the inferior colliculus (IC). It is not clear whether the two types of responses are based on the same or different neural substrates. Although it has been assumed that FFRs are based on phase locking to the periodic sound, the evidence showing the direct relationship between the FFR amplitude and the phase-locking strength is still lacking...
November 7, 2017: Hearing Research
https://www.readbyqxmd.com/read/29156145/fractional-flow-reserve-estimated-at-coronary-ct-angiography-in-intermediate-lesions-comparison-of-diagnostic-accuracy-of-different-methods-to-determine-coronary-flow-distribution
#2
Satoru Kishi, Andreas A Giannopoulos, Anji Tang, Nahoko Kato, Yiannis S Chatzizisis, Carole Dennie, Yu Horiuchi, Kengo Tanabe, João A C Lima, Frank J Rybicki, Dimitris Mitsouras
Purpose To compare the diagnostic accuracy of different computed tomographic (CT) fractional flow reserve (FFR) algorithms for vessels with intermediate stenosis. Materials and Methods This cross-sectional HIPAA-compliant and human research committee-approved study applied a four-step CT FFR algorithm in 61 patients (mean age, 69 years ± 10; age range, 29-89 years) with a lesion of intermediate-diameter stenosis (25%-69%) at CT angiography who underwent FFR measurement within 90 days. The per-lesion diagnostic performance of CT FFR was tested for three different approaches to estimate blood flow distribution for CT FFR calculation...
November 20, 2017: Radiology
https://www.readbyqxmd.com/read/29155383/efficacy-of-optical-coherence-tomography-derived-morphometric-assessment-in-predicting-the-physiological-significance-of-coronary-stenosis-head-to-head-comparison-with-intravascular-ultrasound
#3
Eisuke Usui, Taishi Yonetsu, Yoshihisa Kanaji, Masahiro Hoshino, Masao Yamaguchi, Masahiro Hada, Rikuta Hamaya, Yoshinori Kanno, Tadashi Murai, Tetsumin Lee, Tsunekazu Kakuta
AIMS: This study aimed to investigate the diagnostic efficacy of optical coherence tomography (OCT) in identifying functional significance via fractional flow reserve (FFR) compared with that of intravascular ultrasound (IVUS). METHODS AND RESULTS: We investigated 203 de novo intermediate coronary lesions of 186 patients who underwent frequency-domain OCT, IVUS and FFR measurements. Diagnostic efficacy of the minimal lumen area (MLA) obtained by OCT (OCT-MLA) and IVUS (IVUS-MLA) in predicting an FFR<0...
November 21, 2017: EuroIntervention
https://www.readbyqxmd.com/read/29151547/-the-effect-of-reconstruction-method-on-the-ability-to-analyze-of-ffr-using-ct
#4
Hidekazu Inage, Yosuke Kogure, Kanako Kumamaru, Shinichiro Fujimoto, Kazuhisa Takamura, Yuko Kawaguchi, Htun Han Ni, Haruyoshi Hoshito
BACKGROUND: Invasive-fractional flow reserve (FFR) is the reference standard to evaluate functional ischemia of coronary arteries, and is used to decide if percutaneous transluminal coronary angioplasty is necessary. Recently, computed tomography-derived FFR (CT-FFR) is emerged as an alternative non-invasive method. OBJECTIVES: To evaluate the effect of reconstruction methods and image parameters on the accuracy of CT-FFR calculation. METHODS: A total of 26 segments in the consecutive 10 coronary CT angiography (CCTA) studies were evaluated...
2017: Nihon Hoshasen Gijutsu Gakkai Zasshi
https://www.readbyqxmd.com/read/29148240/what-can-intracoronary-pressure-measurements-tell-us-about-cfr-now-comes-pb-cfr
#5
EDITORIAL
Kenta Nakamura, Larry S Dean
Pressure-bound (pb) coronary flow reserve (CFR) is a novel estimation of CFR, calculated from easily obtained baseline and hyperemic pressure assessment Validation of pb-CFR in previously reported lesions showed accuracy of 84% to CFR with sensitivity of 96% and specificity of 60% FFR >0.75 and low pb-CFR in DEFER was associated with increased angina and complications compared to high pb-CFR and this risk was not modified by elective revascularization.
November 15, 2017: Catheterization and Cardiovascular Interventions
https://www.readbyqxmd.com/read/29145326/should-fraction-flow-reserve-be-considered-an-important-decision-making-tool-to-stratify-patients-with-stable-coronary-artery-disease-for-percutaneous-coronary-intervention-a-meta-analysis
#6
Pravesh Kumar Bundhun, Chakshu Gupta, Feng Huang
BACKGROUND: Nowadays, fraction flow reserve (FFR) is being discussed in every percutaneous coronary intervention (PCI) capable hospitals. Owing to recent development in the medical field, FFR-guided PCI should be able to find a place in Interventional Cardiology. At present, the importance of FFR to stratify patients who require PCI has seldom systematically been investigated. In this analysis, we aimed to compare the major adverse cardiac events (MACEs) mainly in patients with stable coronary artery disease (CAD) to whom PCI was recommended and deferred respectively based on the FFR value...
November 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/29134268/clinical-significance-of-transluminal-attenuation-gradient-in-320-row-area-detector-coronary-ct-angiography
#7
Etsuro Kato, Shinichiro Fujimoto, Kazuhisa Takamura, Yuko Kawaguchi, Chihiro Aoshima, Makoto Hiki, Kanako K Kumamaru, Hiroyuki Daida
The clinical significance of the transluminal attenuation gradient (TAG) has not been established. We evaluated the incremental diagnostic value of TAG by 320-row area detector computed tomography (320-ADCT). Subjects were 65 patients who underwent one-rotation scanning by 320-ADCT and invasive coronary angiography (ICA) within 3 months. TAG values were obtained for the major epicardial vessels 2 mm or more each in RCA, LAD and LCX using automatic analysis software. Moreover, TAG values that excluded calcified lesions in calculation of the regression line were also evaluated (excluded-TAG)...
November 13, 2017: Heart and Vessels
https://www.readbyqxmd.com/read/29129256/instantaneous-wave-free-ratio-and-fractional-flow-reserve-for-the-assessment-of-nonculprit-lesions-during-the-index-procedure-in-patients-with-st-segment-elevation-myocardial-infarction-the-wave-study
#8
Carmine Musto, Francesco De Felice, Stefano Rigattieri, Diana Chin, Andrea Marra, Marco Stefano Nazzaro, Alberta Cifarelli, Roberto Violini
BACKGROUND: Functional assessment of non-infarct-related artery lesions during primary percutaneous coronary intervention (PCI) might be useful to avoid revascularization of nonsignificant stenosis and staged procedures, thus reducing hospital stay. We aimed to assess the diagnostic performance of instantaneous wave-free ratio (iFR) as compared with fractional flow reserve (FFR) in this setting. METHODS: In the WAVE study, a prospective, observational, single-center registry (NCT02869906), paired iFR and FFR measurements were performed at the level of non-IRA lesions in patients with ST-segment elevation myocardial infarction both during primary PCI and during staged procedures (5-8 days after)...
November 2017: American Heart Journal
https://www.readbyqxmd.com/read/29128474/clinical-implications-of-guiding-catheter-extubation-during-fractional-flow-reserve-measurements
#9
Christophe Pouillot, Karim Bougrini, Richard Vi Fane, Geoffray Rambaud, Jens Glasenapp, Christophe Geyer, Julien Adjedj
BACKGROUND: Fractional flow reserve (FFR) is defined by the maximal coronary flow ratio with and without stenosis. AIMS: We hypothesized that guiding catheter intubation in coronary ostia during FFR measurements may underestimate FFR value by limiting the increase of coronary flow during maximal hyperaemia. METHODS: Between June 2013 and January 2014, we prospectively included all patients with i.v. adenosine FFR measurements. FFR was measured with the guiding catheter intubated in the coronary ostia (FFRint) and extubated in the aorta (FFRext)...
November 8, 2017: Archives of Cardiovascular Diseases
https://www.readbyqxmd.com/read/29122932/diagnostic-performance-of-an-acoustic-based-system-for-coronary-artery-disease-risk-stratification
#10
Simon Winther, Louise Nissen, Samuel Emil Schmidt, Jelmer Sybren Westra, Laust Dupont Rasmussen, Lars Lyhne Knudsen, Lene Helleskov Madsen, Jane Kirk Johansen, Bjarke Skogstad Larsen, Johannes Jan Struijk, Lars Frost, Niels Ramsing Holm, Evald Høj Christiansen, Hans Erik Botker, Morten Bøttcher
OBJECTIVE: Diagnosing coronary artery disease (CAD) continues to require substantial healthcare resources. Acoustic analysis of transcutaneous heart sounds of cardiac movement and intracoronary turbulence due to obstructive coronary disease could potentially change this. The aim of this study was thus to test the diagnostic accuracy of a new portable acoustic device for detection of CAD. METHODS: We included 1675 patients consecutively with low to intermediate likelihood of CAD who had been referred for cardiac CT angiography...
November 9, 2017: Heart: Official Journal of the British Cardiac Society
https://www.readbyqxmd.com/read/29121932/hemodynamics-analysis-of-the-serial-stenotic-coronary-arteries
#11
Xin Liu, Changnong Peng, Yufa Xia, Zhifan Gao, Pengcheng Xu, Xiaoqing Wang, Zhanchao Xian, Youbing Yin, Liqun Jiao, Defeng Wang, Lin Shi, Wenhua Huang, Xin Liu, Heye Zhang
Coronary arterial stenoses, particularly serial stenoses in a single branch, are responsible for complex hemodynamic properties of the coronary arterial trees, and the uncertain prognosis of invasive intervention. Critical information of the blood flow redistribution in the stenotic arterial segments is required for the adequate treatment planning. Therefore, in this study, an image based non-invasive functional assessment is performed to investigate the hemodynamic significances of serial stenoses. Twenty patient-specific coronary arterial trees with different combinations of stenoses were reconstructed from the computer tomography angiography for the evaluation of the hemodynamics...
November 9, 2017: Biomedical Engineering Online
https://www.readbyqxmd.com/read/29114590/oncological-outcomes-from-trimodality-therapy-receiving-definitive-doses-of-neoadjuvant-chemoradiation-%C3%A2-60%C3%A2-gy-and-factors-influencing-consideration-for-surgery-in-stage-iii-non-small-cell-lung-cancer
#12
Melissa A L Vyfhuis, Neha Bhooshan, Whitney M Burrows, Michelle Turner, Mohan Suntharalingam, James Donahue, Elizabeth M Nichols, Josephine Feliciano, Søren M Bentzen, Shahed Badiyan, Shamus R Carr, Joseph Friedberg, Charles B Simone, Martin J Edelman, Steven J Feigenberg, Pranshu Mohindra
Purpose: Guidelines for locally advanced non-small cell lung cancer (LA-NSCLC) recommend definitive chemoradiation therapy (CRT) for cN2-N3 disease, reserving surgery for patients with minimal nodal involvement at presentation. The current literature suggests that surgery after CRT for stage III NSCLC can improve freedom-from-recurrence (FFR) but has not consistently demonstrated an improvement in overall survival, perhaps partly due to the low (45-50.4 Gy) preoperative doses delivered that result in low rates of mediastinal nodal clearance...
July 2017: Advances in Radiation Oncology
https://www.readbyqxmd.com/read/29113864/observations-from-a-real-time-ifr-ffr-hybrid-approach-in-patients-with-severe-aortic-stenosis-and-coronary-artery-disease-undergoing-tavi
#13
Roberto Scarsini, Gabriele Pesarini, Mattia Lunardi, Anna Piccoli, Claudia Zanetti, Rosaria Cantone, Michele Bellamoli, Valeria Ferrero, Leonardo Gottin, Giuseppe Faggian, Flavio Ribichini
BACKGROUND: The complexity of coronary physiology in presence of severe aortic stenosis (AS) raises concerns about the reliability of pressure-derived indexes in this clinical setting. Furthermore, neither fractional flow reserve (FFR) nor instantaneous wave-free period (iFR) has been validated in AS. Combining iFR and FFR in a tailored decision-making strategy may help to increase simplicity, accuracy and safety of physiology-guided revascularization in AS. METHODS: In this prospective observational study iFR and FFR were measured before and after TAVI during the same procedure in patients with severe AS and concomitant coronary artery disease (CAD)...
October 3, 2017: Cardiovascular Revascularization Medicine: Including Molecular Interventions
https://www.readbyqxmd.com/read/29103734/relationship-between-optical-coherence-tomography-derived-morphological-criteria-and-functional-relevance-as-determined-by-fractional-flow-reserve
#14
Eisuke Usui, Taishi Yonetsu, Yoshihisa Kanaji, Masahiro Hoshino, Masao Yamaguchi, Masahiro Hada, Tadashi Fukuda, Hiroaki Ohya, Yohei Sumino, Rikuta Hamaya, Yoshinori Kanno, Tadashi Murai, Tetsumin Lee, Tsunekazu Kakuta
BACKGROUND: Although several previous studies have indicated that optical coherence tomography (OCT)-derived minimal lumen area (MLA) correlates with fractional flow reserve (FFR) severity, other morphologic criteria for functionally significant coronary stenosis assessed by FFR have not been fully elucidated. This study aimed to identify OCT-based morphological predictors of physiologically significant ischemia assessed by FFR in angiographically intermediate coronary lesions. METHODS: We investigated 194 de novo intermediate coronary lesions in 178 patients with stable angina pectoris who underwent OCT imaging and FFR measurement...
November 2, 2017: Journal of Cardiology
https://www.readbyqxmd.com/read/29103607/experience-with-an-on-site-coronary-computed-tomography-derived-fractional-flow-reserve-algorithm-for-the-assessment-of-intermediate-coronary-stenoses
#15
Patrick M Donnelly, Márton Kolossváry, Júlia Karády, Peter A Ball, Stephanie Kelly, Donna Fitzsimons, Mark S Spence, Csilla Celeng, Tamás Horváth, Bálint Szilveszter, Hendrik W van Es, Martin J Swaans, Béla Merkely, Pál Maurovich-Horvat
Fractional flow reserve (FFR) derived from coronary computed tomography angiography (CTA) is a new technique for the diagnosis of ischemic coronary artery stenoses. The aim of this prospective study was to evaluate the diagnostic performance of a novel on-site computed tomography-based fractional flow reserve algorithm (CT-FFR) compared with invasive FFR as the gold standard, and to determine whether its diagnostic performance is affected by interobserver variations in lumen segmentation. We enrolled 44 consecutive patients (64...
October 10, 2017: American Journal of Cardiology
https://www.readbyqxmd.com/read/29102938/clinical-impact-of-rest-dual-energy-computed-tomography-myocardial-perfusion-in-patients-with-coronary-artery-disease
#16
Stefan Baumann, Marlon Rutsch, Tobias Becher, Philipp Kryeziu, Holger Haubenreisser, Nils Vogler, Celi Anne Schoenike, Martin Borggrefe, Stefan O Schoenberg, Ibrahim Akin, Thomas Henzler, Dirk Lossnitzer
BACKGROUND/AIM: To evaluate the hypothesis that patients with suspected coronary artery disease (CAD) assessed using rest dual-energy computed tomography-derived myocardial perfusion imaging (DECT-P), could have fewer invasive coronary angiographies (ICA), showing non-obstructive CAD. MATERIALS AND METHODS: Patients who had undergone coronary computed tomography angiography (cCTA), rest DECT-P and ICA were analyzed. RESULTS: We evaluated 51 patients (62...
November 2017: In Vivo
https://www.readbyqxmd.com/read/29102036/coronary-computed-tomographic-angiography-derived-fractional-flow-reserve-for-therapeutic-decision-making
#17
Christian Tesche, Rozemarijn Vliegenthart, Taylor M Duguay, Carlo N De Cecco, Moritz H Albrecht, Domenico De Santis, Marcel C Langenbach, Akos Varga-Szemes, Brian E Jacobs, David Jochheim, Moritz Baquet, Richard R Bayer, Sheldon E Litwin, Ellen Hoffmann, Daniel H Steinberg, U Joseph Schoepf
This study investigated the performance of coronary computed tomography angiography (cCTA) with cCTA-derived fractional flow reserve (CT-FFR) compared with invasive coronary angiography (ICA) with fractional flow reserve (FFR) for therapeutic decision making in patients with suspected coronary artery disease (CAD). Seventy-four patients (62 ± 11 years, 62% men) with at least 1 coronary stenosis of ≥50% on clinically indicated dual-source cCTA, who had subsequently undergone ICA with FFR measurement, were retrospectively evaluated...
September 19, 2017: American Journal of Cardiology
https://www.readbyqxmd.com/read/29101020/angiography-based-quantitative-flow-ratio-for-online-assessment-of-coronary-stenosis-favor-ii-china-study
#18
Bo Xu, Shengxian Tu, Shubin Qiao, Xinkai Qu, Yundai Chen, Junqing Yang, Lijun Guo, Zhongwei Sun, Zehang Li, Feng Tian, Weiyi Fang, Jiyan Chen, Wei Li, Changdong Guan, Niels R Holm, William Wijns, Shengshou Hu
OBJECTIVES: To assess the diagnostic performance of quantitative flow ratio (QFR) for diagnosis of hemodynamically-significant coronary stenosis defined by fractional flow reserve (FFR) ≤0.80. BACKGROUND: QFR is a novel angiography-based method for deriving FFR without pressure wire or induction of hyperemia. The accuracy of QFR when assessed online in the catheterization laboratory has not been adequately examined to date. METHODS: This prospective, multicenter trial enrolled patients who had at least one lesion with diameter stenosis of 30-90% and reference diameter ≥ 2mm by visual estimation...
October 20, 2017: Journal of the American College of Cardiology
https://www.readbyqxmd.com/read/29098379/influence-of-hydrostatic-pressure-on-intracoronary-indices-of-stenosis-severity-in-vivo
#19
Tobias Härle, Mareike Luz, Sven Meyer, Felix Vahldiek, Pim van der Harst, Randy van Dijk, Daan Ties, Javier Escaned, Justin Davies, Albrecht Elsässer
BACKGROUND: An influence of hydrostatic pressure on intracoronary indices of stenosis severity in vitro was recently reported. We sought to analyze the influence of hydrostatic pressure, caused by the height difference between the distal and proximal pressure sensor after guidewire positioning in the interrogated vessel, on intracoronary pressure measurements in vivo. METHODS AND RESULTS: In 30 coronary stenoses, intracoronary pressure measurements were performed in supine, left, and right lateral patient position...
November 2, 2017: Clinical Research in Cardiology: Official Journal of the German Cardiac Society
https://www.readbyqxmd.com/read/29092125/significant-drop-in-right-atrial-pressure-does-not-influence-fractional-flow-reserve-coronary-assessment
#20
Roberto Scarsini, Gabriele Pesarini, Fausto Castriota, Corrado Vassanelli, Flavio Ribichini
The effect of a highly elevated level of right atrial filling pressure on fractional flow reserve (FFR) measurement remains unclear. Transcatheter tricuspid valve intervention, a recently introduced option for inoperable or high-risk patients, represents a unique model of in-vivo physiology to investigate the eventual influence of central venous pressure on coronary FFR measurements. The case is reported of a patient with a degenerated tricuspid surgical bioprosthesis who underwent transcatheter tricuspid valve-in-valve replacement and concomitant coronary functional assessment with FFR...
May 2017: Journal of Heart Valve Disease
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