11 results on '"Brett Duncan"'
Search Results
2. Subaortic Membrane and Hypertrophic Obstructive Cardiomyopathy in the Cardiac Catheterization Lab
- Author
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Musa A. Sharkawi, Immad Sadiq, Brett Duncan, and Talhat Azemi
- Subjects
Heart Defects, Congenital ,Cardiac Catheterization ,medicine.medical_specialty ,Fibrous membrane ,Cardiac catheterization lab ,030204 cardiovascular system & hematology ,urologic and male genital diseases ,Obstructive cardiomyopathy ,Ventricular Outflow Obstruction ,03 medical and health sciences ,0302 clinical medicine ,Internal medicine ,medicine ,Humans ,cardiovascular diseases ,030212 general & internal medicine ,Radionuclide Ventriculography ,business.industry ,Hemodynamics ,Discrete Subaortic Stenosis ,Cardiomyopathy, Hypertrophic ,Middle Aged ,Echocardiography ,cardiovascular system ,Cardiology ,Female ,Subvalvular Aortic Stenosis ,Cardiology and Cardiovascular Medicine ,business - Abstract
Obstruction of the left ventricular outflow can be caused by several lesions. These are classified by location as subvalvular, valvular, or supravalvular. Subvalvular aortic stenosis, which may have a dynamic component, may be due to a fibrous membrane, muscular obstruction, or a combination of the
- Published
- 2017
3. Cardiac tamponade: a rare complication of idiopathic hypereosinophilic syndrome
- Author
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Antonio B. Fernandez, Stephen Firshein, Shafeeq Ahmed, Jeffrey Kluger, and Brett Duncan
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Systemic disease ,Pediatrics ,medicine.medical_specialty ,Biopsy ,Pericardial Effusion ,Cardiac tamponade ,Hypereosinophilic Syndrome ,Humans ,Hydroxyurea ,Pericarditis ,Medicine ,Aged ,medicine.diagnostic_test ,business.industry ,General Medicine ,medicine.disease ,Pathophysiology ,Cardiac Tamponade ,Echocardiography ,cardiovascular system ,Prednisone ,Female ,Idiopathic hypereosinophilic syndrome ,Cardiology and Cardiovascular Medicine ,Complication ,business ,Pericardium ,Medical literature - Abstract
Idiopathic hypereosinophilic syndrome (IHES) is a rare systemic disease with multiple clinical presentations including cardiac, pulmonary and dermatologic manifestations. Little is known about the pathophysiology and potential triggers of this condition. Approximately 40-70% of these cases have cardiac involvement, which is the major cause of morbidity and mortality. Cardiac tamponade is a rare but serious complication of IHES. Herein, we report a patient with IHES who presented with cardiac tamponade. To the authors' knowledge, this is the second case of cardiac tamponade in adults with IHES reported in the medical literature.
- Published
- 2009
4. Neural networks for sentiment analysis on Twitter
- Author
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Yan-Qing Zhang and Brett Duncan
- Subjects
Training set ,Information retrieval ,Artificial neural network ,Polarity (physics) ,Computer science ,InformationSystems_INFORMATIONSTORAGEANDRETRIEVAL ,Sentiment analysis ,Feedforward neural network ,InformationSystems_MISCELLANEOUS ,Set (psychology) ,Data science ,Movie reviews - Abstract
The online medium has become a significant way that people express their opinions online. Sentiment analysis can be used to find out the polarity of an opinion, such as positive, negative, or neutral. Sentiment analysis has applications such as companies getting their customer's opinions on their products, political sentiment analysis, or opinions on movie reviews. Recent research has involved looking at text from online blogs, tweets, online movie reviews, etc. to try and classify the text as being positive, negative, or neutral. For this research, a feedforward neural network will be experimented with for sentiment analysis of tweets. The training set of tweets are collected using the Twitter API using positive and negative keywords. The testing set of tweets are collected using the same positive and negative keywords.
- Published
- 2015
5. Classical Guitar Lessons for Beginners : Teach Yourself How to Play Guitar (Free Video Available)
- Author
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LearnToPlayMusic.com, Brett Duncan, LearnToPlayMusic.com, and Brett Duncan
- Subjects
- Guitar--Instruction and study, Guitar--Methods--Self-instruction, Guitar music
- Abstract
Teach yourself how to play guitar with our easy classical guitar lessons for beginners.•••Comes with online access to free guitar videos and audio for all examples. See and hear how each one is played by a teacher, then play along with the backing band. Also includes music score animation for easy music learning.•••'Best teacher on paper! I've always wanted to learn how to play a guitar. It amazes me how I was able to learn so fast.'- Joe McDougal, Leominster MAProgressive Beginner Classical Guitar contains all you need to know to start learning to be a great classical guitar player - in one easy-to-follow, lesson-by-lesson classical guitar tutorial. Suitable for all ages and all types of classical guitars. No prior knowledge of how to read music or playing the guitar is required to teach yourself to learn to play guitar from this book.Teach yourself:• How to play basic guitar chords for beginners, guitar notes for beginners, arpeggios and classical guitar scales• All the left hand and right hand fundamental techniques of classical guitar playing• Practical guitar theory for learning how to read classical guitar music for beginners to play solo or in an ensemble• How to tune a guitar• Classical guitar tips and classical guitar tricks that every player should know when learning guitar• Shortcuts for how to learn guitar fast by getting the most from guitar practice sessionsContains everything you need to know to learn to play the guitar today.Features include:• Progressive step-by-step easy guitar lessons written by a professional classical guitar teacher• Easy-to-read classical guitar music• Photos and diagrams• 70+ classical guitar exercises and popular easy classical guitar songs for beginners including music by Tarrega, Giuliani, Sor, Aguado, Carulli and CarcassiBeginner guitar lessons have never been this easy for anyone who wants to learn how to play the guitar, fast.LearnToPlayMusic.com's classical guitar lessons for beginners are used by students and guitar teachers worldwide to learn how to play guitar. For over 30 years, our team of professional authors, composers and musicians have crafted guitar lesson books that are a cut above the rest. We offer a huge selection of music instruction books that cover many different instruments and styles in print, eBook and app formats. Awarded the'Quality Excellence Design'(QED) seal of approval for eBook innovation, LearnToPlayMusic.com continues to set the standard for quality music education resources.
- Published
- 2013
6. A 24-Hour Comparison of Serum Growth Hormone Concentrations in Patients with Heart Failure versus Healthy Controls
- Author
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Laurie Finta, Muthu Velusamy, Stacey Wieczorek, Alan H.B. Wu, C Michael White, Gary V. Heller, Brett Duncan, Anita Kelsey, Deborah Katten, C.C. McGill, and Niall M. Moyna
- Subjects
Adult ,Cardiomyopathy, Dilated ,Male ,medicine.medical_specialty ,Heart disease ,Cmax ,Growth hormone ,Gastroenterology ,Internal medicine ,medicine ,Humans ,Pharmacology (medical) ,In patient ,Prospective Studies ,business.industry ,Serum growth hormone ,Middle Aged ,medicine.disease ,Pathophysiology ,Circadian Rhythm ,Endocrinology ,Area Under Curve ,Case-Control Studies ,Growth Hormone ,Heart failure ,Female ,Drug Monitoring ,Single point ,business - Abstract
Study Objective. To compare endogenous serum growth hormone concentrations over a 24-hour period in patients with chronic heart failure (CHF) and matched controls. Design. Prospective, 24-hour, endogenous concentration comparison. Setting. Hospital research center. Patients. Eight evaluable patients with nonischemic dilated cardiomyopathy and 10 healthy control subjects, matched for age and sex. Intervention. Over a 24-hour period, blood was drawn from the study participants every 20 minutes for determination of growth hormone. Measurements and Main Results. For each patient, the area under the concentration-time curve from time 0–24 hours (AUC0–24), maximum concentration (Cmax), and minimum concentration (Cnadir) of growth hormone were determined. The AUC0–24 and Cmax were 74% (p
- Published
- 2003
7. Acute rest myocardial perfusion imaging in the evaluation of patients with chest pain syndromes
- Author
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Gary V. Heller and Brett Duncan
- Subjects
medicine.medical_specialty ,Myocardial perfusion imaging ,medicine.diagnostic_test ,business.industry ,Internal medicine ,medicine ,Cardiology ,medicine.symptom ,Cardiology and Cardiovascular Medicine ,Chest pain ,business ,General Nursing ,Rest (music) - Published
- 2000
8. Comparison of electrocardiographic-gated technetium-99m sestamibi single-photon emission computed tomographic imaging and rest-redistribution thallium-201 in the prediction of myocardial viability
- Author
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David D. Waters, Brett Duncan, Alan W. Ahlberg, C.C. McGill, April Mann, Jeffrey Mather, Gary V. Heller, Michael G Levine, and Michael P White
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Technetium Tc 99m Sestamibi ,medicine.medical_specialty ,medicine.medical_treatment ,Coronary Disease ,Revascularization ,Sensitivity and Specificity ,Technetium (99mTc) sestamibi ,Electrocardiography ,Ventricular Dysfunction, Left ,Predictive Value of Tests ,Spect imaging ,Internal medicine ,Humans ,Medicine ,Prospective Studies ,cardiovascular diseases ,Myocardial Stunning ,Tomography, Emission-Computed, Single-Photon ,Ejection fraction ,medicine.diagnostic_test ,business.industry ,Thallium Radioisotopes ,Predictive value of tests ,Cardiology ,Radiopharmaceuticals ,Cardiology and Cardiovascular Medicine ,business ,Nuclear medicine ,Perfusion ,medicine.drug - Abstract
Although the combined assessment of perfusion and function using rest electrocardiographic (ECG)-gated technetium-99m (Tc-99m) sestamibi single-photon emission computed tomographic (SPECT) imaging has been shown to improve sensitivity and accuracy over perfusion alone in the prediction of myocardial viability, no data are available comparing this technique with rest-redistribution thallium-201. Thirty patients with coronary artery disease and left ventricular dysfunction (ejection fractionor = 40%) underwent rest-redistribution thallium-201 and rest ECG-gated Tc-99m sestamibi SPECT imaging before revascularization and rest ECG-gated Tc-99m sestamibi SPECT imaging at 1 or 6 weeks after revascularization. All thallium-201 and Tc-99m sestamibi images were interpreted by a consensus agreement of 3 experienced readers without knowledge of patient identity or time of imaging with Tc-99m sestamibi (before or after revascularization) using a 17-segment model. Concordance between techniques for the prediction of viability was 89% (kappa 0.556 +/- 0.109). With rest-redistribution thallium-201, sensitivity, specificity, positive predictive value, negative predictive value, and predictive accuracy were 95%, 59%, 88%, 78%, and 86%, respectively. With rest ECG-gated Tc-99m sestamibi SPECT imaging, sensitivity, specificity, positive predictive value, negative predictive value, and predictive accuracy were 96%, 55%, 87%, 80%, and 86%, respectively (p = NS vs rest-redistribution thallium-201). Although both techniques are comparable for detecting viable myocardium, rest ECG-gated Tc-99m sestamibi SPECT imaging allows direct assessment of both myocardial perfusion and ventricular function, which may be clinically useful in patients who require assessment of myocardial viability.
- Published
- 2000
9. Protein kinetics in stable heart failure patients
- Author
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Melissa R. Donaldson, M. D. Schluter, T. Peter Stein, Niall M. Moyna, Charles W. Cortes, Brett Duncan, M. J. Leskiw, and Paul D. Thompson
- Subjects
Male ,medicine.medical_specialty ,Cardiac output ,Heart disease ,Physiology ,Muscle Proteins ,Fibrinogen ,Physiology (medical) ,Internal medicine ,medicine ,Protein biosynthesis ,Humans ,Insulin ,Muscle, Skeletal ,Aged ,chemistry.chemical_classification ,Heart Failure ,biology ,Protein turnover ,Blood Proteins ,medicine.disease ,Kinetics ,Endocrinology ,chemistry ,Liver ,Transferrin ,Heart failure ,Case-Control Studies ,biology.protein ,Female ,Ceruloplasmin ,medicine.drug - Abstract
Heart failure (HF) is a slow progressive syndrome characterized by low cardiac output and peripheral metabolic, biochemical, and histological alterations. Protein loss and reduced protein turnover occur with aging, but the consequences of congestive HF (CHF) superimposed on the normal aging response are unknown. This study has two objectives: 1) to determine whether there was a difference between older age-matched controls and those with stable HF (i.e., ischemic pathology) in whole body protein turnover and 2) to determine whether protein metabolism in liver and skeletal muscle protein turnover is impacted by CHF. We measured the whole body protein synthesis rate with a U-15N-labeled algal protein hydrolysate in 10 patients with CHF and in 10 age-matched controls. Muscle fractional synthesis rate of lateral vastus muscle was determined with [U-13C]alanine on muscle biopsies obtained by a standard percutaneous needle biopsy technique. Fractional synthesis rates of five plasma proteins of hepatic origin (fibrinogen, complement C-3, ceruloplasmin, transferrin, and very low-density lipoprotein apoliprotein B-100) were determined by using2H5-labeled l-phenylalanine as tracer. Results showed that whole body protein synthesis rate was reduced in CHF patients (3.09 ± 0.19 vs. 2.25 ± 0.71 g protein · kg−1 · day−1, P < 0.05) as was muscle fractional synthesis rate (3.02 ± 0.58 vs. 1.33 ± 0.71%/day, P < 0.05) and very low-density lipoprotein apoliprotein B-100 (265 ± 25 vs. 197 ± 16%/day, P < 0.05). CHF patients were hyperinsulinemic (9.6 ± 3.1 vs. 47.0 ± 7.8 μU/ml, P < 0.01). The results were compared with those found with bed rest patients. In conclusion, protein turnover is depressed in CHF patients, and both skeletal muscle and liver are impacted. These results are similar to those found with bed rest, which suggests that inactivity is a factor in depressed protein metabolism.
- Published
- 2002
10. Effect of intravenous testosterone on myocardial ischemia in men with coronary artery disease
- Author
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C Michael White, Melissa J. Ferraro-Borgida, Alan W. Ahlberg, Gary V. Heller, Niall M. Moyna, C.C. McGill, Paul D. Thompson, and Brett Duncan
- Subjects
Male ,Technetium Tc 99m Sestamibi ,medicine.medical_specialty ,Myocardial Ischemia ,Perfusion scanning ,Placebo ,Coronary artery disease ,Myocardial perfusion imaging ,Internal medicine ,Heart rate ,Medicine ,Humans ,Testosterone ,Aged ,Tomography, Emission-Computed, Single-Photon ,medicine.diagnostic_test ,business.industry ,Testosterone (patch) ,Middle Aged ,medicine.disease ,Endocrinology ,Blood pressure ,Cardiology ,Radiopharmaceuticals ,Cardiology and Cardiovascular Medicine ,business ,Perfusion - Abstract
Background Studies on the effect of estrogen on atherosclerotic coronary artery disease (CAD) risk in women have produced conflicting results. Similar confusion, but fewer data, exists on the effect of testosterone on CAD risk in men. Methods We used 99mTc sestamibi single-photon emission computed tomography (SPECT) myocardial perfusion imaging to examine the acute effect of intravenous testosterone in 32 men (mean age, 69.1 ± 6.4 years) with provocable myocardial ischemia on standard medical therapy. Patients performed 3 exercise (n = 18) or adenosine (n = 16) stress tests during the infusion of placebo or 2 doses of testosterone designed to increase testosterone 2 or 6 times baseline. Results Serum testosterone increased 137 ± 58% and 488 ± 113%, and estradiol levels increased 27 ± 46% and 76 ± 57%, (P
- Published
- 2002
11. Rhabdomyolysis Associated With Pomegranate Juice Consumption
- Author
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Alexey V. Sorokin, Randolph Panetta, Paul D. Thompson, and Brett Duncan
- Subjects
Male ,Ezetimibe 10 MG ,medicine.medical_specialty ,Gastroenterology ,Rhabdomyolysis ,Beverages ,Hyperlipoproteinemia Type II ,Internal medicine ,medicine ,Humans ,Rosuvastatin ,Rosuvastatin Calcium ,Myopathy ,Creatine Kinase ,Lythraceae ,Sulfonamides ,biology ,CYP3A4 ,business.industry ,nutritional and metabolic diseases ,Middle Aged ,medicine.disease ,Fluorobenzenes ,Pyrimidines ,Endocrinology ,biology.protein ,Cardiology ,Thigh pain ,Creatine kinase ,Hydroxymethylglutaryl-CoA Reductase Inhibitors ,medicine.symptom ,Cardiology and Cardiovascular Medicine ,business ,Follow-Up Studies ,medicine.drug - Abstract
This 48-year-old man with possible underlying myopathy was successfully treated with ezetimibe 10 mg/day and rosuvastatin 5 mg every other day for 17 months. Three weeks before presentation, he began drinking pomegranate juice (200 ml twice weekly). He presented urgently with thigh pain and an elevated serum creatine kinase level (138,030 U/L, normal < 200 U/L). In conclusion, because both grapefruit and pomegranate juice are known to inhibit intestinal cytochrome P450 3A4, this report suggests that pomegranate juice may increase the risk of rhabdomyolysis during rosuvastatin treatment, despite the fact that rosuvastatin is not known to be metabolized by hepatic P450 3A4.
- Published
- 2006
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