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Chua S, Ajaero C, Assadi-Khansari B, Horowitz J, Sverdlov A, Ngo D. Galectin 3 Predicts Functional Capacity in Patients with Severe Congestive Heart Failure (CHF). Heart Lung Circ 2016. [DOI: 10.1016/j.hlc.2016.06.262] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Chong C, Liu S, Sallustio B, Chirkov Y, Horowitz J. Effects of Perhexiline on Insulin and Nitric Oxide Signalling in Diabetics. Heart Lung Circ 2016. [DOI: 10.1016/j.hlc.2016.06.200] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Chua S, Assadi-Khansari B, Horowitz J, Sverdlov A, Ngo D. Galectin-3 Levels Is not a Predictor of Increased Left Ventricular Mass in a Healthy Ageing Population. Heart Lung Circ 2016. [DOI: 10.1016/j.hlc.2016.06.180] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Horowitz J. Occupation times and other accumulation processes. ADV APPL PROBAB 2016. [DOI: 10.2307/1426345] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Tully PJ, Turnbull DA, Beltrame J, Horowitz J, Cosh S, Baumeister H, Wittert GA. Panic disorder and incident coronary heart disease: a systematic review and meta-regression in 1131612 persons and 58111 cardiac events. Psychol Med 2015; 45:2909-2920. [PMID: 26027689 DOI: 10.1017/s0033291715000963] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
BACKGROUND Substantial healthcare resources are devoted to panic disorder (PD) and coronary heart disease (CHD); however, the association between these conditions remains controversial. Our objective was to conduct a systematic review of studies assessing the association between PD, related syndromes, and incident CHD. METHOD Relevant studies were retrieved from Medline, EMBASE, SCOPUS and PsycINFO without restrictions from inception to January 2015 supplemented with hand-searching. We included studies that reported hazard ratios (HR) or sufficient data to calculate the risk ratio and 95% confidence interval (CI) which were pooled using a random-effects model. Studies utilizing self-reported CHD were ineligible. Twelve studies were included comprising 1 131 612 persons and 58 111 incident CHD cases. RESULTS PD was associated with the primary incident CHD endpoint [adjusted HR (aHR) 1.47, 95% CI 1.24-1.74, p < 0.00001] even after excluding angina (aHR 1.49, 95% CI 1.22-1.81, p < 0.00001). High to moderate quality evidence suggested an association with incident major adverse cardiac events (MACE; aHR 1.40, 95% CI 1.16-1.69, p = 0.0004) and myocardial infarction (aHR 1.36, 95% CI 1.12-1.66, p = 0.002). The risk for CHD was significant after excluding depression (aHR 1.64, 95% CI 1.45-1.85) and after depression adjustment (aHR 1.38, 95% CI 1.03-1.87). Age, sex, length of follow-up, socioeconomic status and diabetes were sources of heterogeneity in the primary endpoint. CONCLUSIONS Meta-analysis showed that PD was independently associated with incident CHD, myocardial infarction and MACE; however, reverse causality cannot be ruled out and there was evidence of heterogeneity.
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Goto S, Zhu J, Lisheng L, Oh BH, Wojdyla D, Hanna M, Horowitz J, Wallentin L, Xavier D, Alexander JH. Efficacy and safety of apixaban compared with warfarin for stroke prevention in atrial fibrillation in East Asia. Eur Heart J 2013. [DOI: 10.1093/eurheartj/eht310.p5613] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Nguyen TH, Neil C, Singh K, Heresztyn T, Chirkov Y, Horowitz J. Determinants of prolonged impairment of global longitudinal strain post Takotsubo cardiomyopathy. Eur Heart J 2013. [DOI: 10.1093/eurheartj/eht309.p4247] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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Procter N, Ball J, Ngo D, Chirkov Y, Isenberg J, Hylek E, Stewart S, Horowitz J. Impact of Female Gender and Admission Heart Rate on Platelet Aggregation and Nitric Oxide Signalling in Atrial Fibrillation. Heart Lung Circ 2013. [DOI: 10.1016/j.hlc.2013.05.153] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Nguyen T, Neil C, Chong C, Singh K, Heresztyn T, Chirkov Y, Horowitz J. Can Recurrence of Takotsubo Cardiomyopathy be Predicted? Heart Lung Circ 2013. [DOI: 10.1016/j.hlc.2013.05.170] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Singh K, Neil C, Stansborough J, Nguyen H, Frenneaux M, Horowitz J. Interaction Between Left and Right Ventricular Dysfunction in Tako-Tsubo Cardiomyopathy: Impact on Haemodynamics and Morbidity. Heart Lung Circ 2013. [DOI: 10.1016/j.hlc.2013.05.192] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Raman B, Singh K, Neil C, Nguyen T, Stansborough J, Zietz C, Horowitz J. Not Such a Rarity! Takotsubo Cardiomyopathy as a Mimic of ST Elevation Myocardial Infarction. Heart Lung Circ 2013. [DOI: 10.1016/j.hlc.2013.05.202] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Nichols B, Shrestha RP, Horowitz J, Hollot CV, Germain MJ, Gaweda AE, Chait Y. Simplification of an erythropoiesis model for design of anemia management protocols in end stage renal disease. ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. ANNUAL INTERNATIONAL CONFERENCE 2012; 2011:83-6. [PMID: 22254256 DOI: 10.1109/iembs.2011.6089902] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Many end stage renal disease (ESRD) patients suffer from anemia due to insufficient endogenous production of erythropoietin (EPO). The discovery of recombinant human EPO (rHuEPO) over 30 years ago has shifted the treatment of anemia for patients on dialysis from blood transfusions to rHuEPO therapy. Many anemia management protocols (AMPs) used by clinicians comprise a set of experience-based rules for weekly-to-monthly titration of rHuEPO doses based on hemoglobin (Hgb) measurements. In order to facilitate the design of an AMP based on formal control design methods, we present a physiologically-relevant erythropoiesis model, and show that its nonlinear dynamics can be approximated using a static nonlinearity, a step that greatly simplifies AMP design. We demonstrate applicability of our results using clinical data.
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Nguyen T, Horowitz J, Unger S. Cardiac Denervation in Chronic Heart Failure: Relationship to Changes in LV Function and to Arrhythmogenesis. Heart Lung Circ 2012. [DOI: 10.1016/j.hlc.2012.05.186] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Chan W, Sverdlov A, Ngo D, Rajendran S, Chirkov Y, Horowitz J. Polycystic Ovarian Syndrome as a State of Premature Ageing of the Nitric Oxide System. Heart Lung Circ 2012. [DOI: 10.1016/j.hlc.2012.05.630] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Neil C, Nguyen T, Chapman M, Mahadavan G, Zeitz C, Horowitz J. Residual LV Systolic Dysfunction Post-Tako-Tsubo Cardiomyopathy. Heart Lung Circ 2012. [DOI: 10.1016/j.hlc.2012.05.633] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Nordin BEC, Lewis JR, Daly RM, Horowitz J, Metcalfe A, Lange K, Prince RL. The calcium scare--what would Austin Bradford Hill have thought? Osteoporos Int 2011; 22:3073-7. [PMID: 21633827 DOI: 10.1007/s00198-011-1680-4] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/29/2011] [Accepted: 05/16/2011] [Indexed: 10/18/2022]
Abstract
UNLABELLED Detailed consideration of the suggested association between calcium supplementation and heart attacks has revealed weakness in the evidence which make the hypothesis highly implausible. INTRODUCTION The aim of this study was to evaluate the strength of the evidence that calcium supplementation increases the risk of myocardial infarction. METHODS This study used critical examination of a meta-analysis of the effects of calcium supplements on heart attacks in five prospective trials on 8,016 men and women, and consideration of related publications by the same author. RESULTS The meta-analysis was found to be subject to several limitations including non-adherence to the clinical protocol, multiple endpoint testing and failure to correctly adjust for endpoint ascertainment. The main risk factors for myocardial infarction were not available for 65% of the participants, and none of the trials had cardiovascular disease as its primary endpoint. There were more overweight participants, more subjects on thyroxine and more men on calcium than on placebo. In particular, over 65% of all the heart attacks were self-reported. When the evidence was considered in the light of Austin Bradford Hill's six main criteria for disease causation, it was found not to be biologically plausible or strong or to reflect a dose-response relationship or to be consistent or to reflect the relationship between the trends in calcium supplementation and heart attacks in the community or to have been confirmed by experiment. The addition of a more recent trial on 1,460 women over 5 years reduced the relative risk to 1.23 (P = 0.0695). CONCLUSION Present evidence that calcium supplementation increases heart attacks is too weak to justify a change in prescribing habits.
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Weber M, Schueler R, Momcilovic D, Sinning J, Ghanem A, Werner N, Nickenig G, Hammerstingl C, Sun B, Hwang K, Cho M, Lee W, Choi S, Kim YG, Kim DH, Song JM, Kang DH, Song JK, Capoulade R, Clavel M, Dumesnil J, Chan K, Tam J, Teo K, Cote N, Mathieu P, Despres J, Pibarot P, Macron L, Lim P, Bensaid A, Nahum J, Attias D, Messika Zeitoun D, Dubois Rande J, Gueret P, Monin J, Le Tourneau T, Lardeux A, Garcia A, Kyndt F, Merot J, Hagege A, Levine R, Schott J, La Marec H, Probst V, Niki K, Sugawara M, Takamisawa I, Watanabe H, Sumiyoshi T, Hosoda S, Takanashi S, Veronesi F, Caiani E, Fusini L, Tamborini G, Sugeng L, Alamanni F, Pepi M, Lang R, Gripari P, Muratori M, Fusini L, Ajmone Marsan N, Hooi Ewe S, Arnold C, Van Der Kley F, Tamborini G, Pepi M, Bax J, Adda J, Mielot C, Cransac F, Zirphile X, Reant P, Sportouch-Dukhan C, Lafitte S, Donal E, Lancellotti P, Habib G, Akbar Ali O, Chapman M, Nguyen T, Chirkov Y, Horowitz J. Moderated Poster Sessions 1: Valvular heart disease: from bench to bedside * Thursday 8 December 2011, 08:30-12:30 * Location: Moderated Poster Area. EUROPEAN JOURNAL OF ECHOCARDIOGRAPHY 2011. [DOI: 10.1093/ejechocard/jer205] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
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Merrill S, Horowitz J, Traino AC, Chipkin SR, Hollot CV, Chait Y. Accuracy and optimal timing of activity measurements in estimating the absorbed dose of radioiodine in the treatment of Graves' disease. Phys Med Biol 2011; 56:557-71. [PMID: 21212469 DOI: 10.1088/0031-9155/56/3/003] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Calculation of the therapeutic activity of radioiodine (131)I for individualized dosimetry in the treatment of Graves' disease requires an accurate estimate of the thyroid absorbed radiation dose based on a tracer activity administration of (131)I. Common approaches (Marinelli-Quimby formula, MIRD algorithm) use, respectively, the effective half-life of radioiodine in the thyroid and the time-integrated activity. Many physicians perform one, two, or at most three tracer dose activity measurements at various times and calculate the required therapeutic activity by ad hoc methods. In this paper, we study the accuracy of estimates of four 'target variables': time-integrated activity coefficient, time of maximum activity, maximum activity, and effective half-life in the gland. Clinical data from 41 patients who underwent (131)I therapy for Graves' disease at the University Hospital in Pisa, Italy, are used for analysis. The radioiodine kinetics are described using a nonlinear mixed-effects model. The distributions of the target variables in the patient population are characterized. Using minimum root mean squared error as the criterion, optimal 1-, 2-, and 3-point sampling schedules are determined for estimation of the target variables, and probabilistic bounds are given for the errors under the optimal times. An algorithm is developed for computing the optimal 1-, 2-, and 3-point sampling schedules for the target variables. This algorithm is implemented in a freely available software tool. Taking into consideration (131)I effective half-life in the thyroid and measurement noise, the optimal 1-point time for time-integrated activity coefficient is a measurement 1 week following the tracer dose. Additional measurements give only a slight improvement in accuracy.
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Sverdlov A, Ngo D, Chirkov Y, Horowitz J. Insight into Retardation of Aortic Stenosis: A Therapeutic Role for ACE Inhibitors? Heart Lung Circ 2011. [DOI: 10.1016/j.hlc.2011.05.511] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Carrington M, Stewart S, Marwick T, Davidson P, Macdonald P, Horowitz J, Krum H, Newton P, Reid C. Which Heart Failure Intervention is Most Cost-effective & Consumer Friendly in Reducing Hospital Care? Results from the Multicentre Randomised WHICH? Trial. Heart Lung Circ 2011. [DOI: 10.1016/j.hlc.2011.05.195] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Nguyen T, Unger S, Horowitz J. Changes in Cardiac Denervation Independent of Changes in Systolic Function During Follow-up in CHF Patients. Heart Lung Circ 2011. [DOI: 10.1016/j.hlc.2011.05.150] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Lee KJ, Ehrenpreis ED, Greenberg J, Yang GY, Horowitz J. Mesenteric panniculitis following colonoscopy, polypectomy, and epinephrine injection. Endoscopy 2010; 42 Suppl 2:E44-5. [PMID: 20157883 DOI: 10.1055/s-0029-1215259] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/10/2022]
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Neil C, Kucia A, Nguyen H, Sverdlov A, Chan A, Dautov R, Mohasseb I, Selvanayagam J, Arstall M, Zeitz C, Beltrame J, Horowitz J. Relationship Between Precipitant Stressor and Timing of Clinical Diagnosis in Tako-Tsubo Cardiomyopathy. Heart Lung Circ 2010. [DOI: 10.1016/j.hlc.2010.06.547] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Kucia A, Neil C, Nguyen T, Beltrame J, Arstall M, Horowitz J. Evolution of ECG Changes in Tako Tsubo Cardiomyopathy: Arrhythmias First, QT Prolongation Later? Heart Lung Circ 2010. [DOI: 10.1016/j.hlc.2010.06.911] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Sverdlov A, Ngo D, Nightingale A, Rajendran S, Ritchie R, Frenneaux M, Horowitz J. Relationship between LV Mass and Diastolic Function is Independent of NO Generation. Heart Lung Circ 2010. [DOI: 10.1016/j.hlc.2010.06.790] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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