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Ralph Lazzara

TitleRegents Professor
InstitutionUniversity of Oklahoma Health Sciences Center
DepartmentHeart Rhythm Institute
Address1200 Everett Dr
Oklahoma City OK 73104-5047
Phone405/271-9696
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    Collapse Bibliographic 
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    Publications listed below are automatically derived from MEDLINE/PubMed and other sources, which might result in incorrect or missing publications. Faculty can login to make corrections and additions.
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    1. Stavrakis S, Stoner JA, Kardokus J, Garabelli PJ, Po SS, Lazzara R. Intermittent vs. Continuous Anticoagulation theRapy in patiEnts with Atrial Fibrillation (iCARE-AF): a randomized pilot study. J Interv Card Electrophysiol. 2017 Jan; 48(1):51-60. PMID: 27696012.
      View in: PubMed
    2. Stavrakis S, Dyer JW, Koomson E, Scherlag BJ, Bhardwaj B, Lazzara R, Po SS. Spectral Analysis of Baseline Electrocardiogram During Atrial Fibrillation Predicts Response to Antiarrhythmic Drug Therapy in Patients With Persistent Atrial Fibrillation. J Cardiovasc Electrophysiol. 2016 Aug 10. PMID: 27506321.
      View in: PubMed
    3. Scherlag BJ, Lazzara R. Functional aspects of His bundle physiology and pathophysiology: Clinical implications. J Electrocardiol. 2017 Jan - Feb; 50(1):151-155. PMID: 27539164.
      View in: PubMed
    4. Murphy C, Lazzara R. Current concepts of anatomy and electrophysiology of the sinus node. J Interv Card Electrophysiol. 2016 Jun; 46(1):9-18. PMID: 27142063.
      View in: PubMed
    5. Lazzara R. Supraventricular extrasystolic activity and the elusive goal of identifying the imminent triggers of atrial fibrillation. Heart Rhythm. 2015 Sep; 12(9):1905-6. PMID: 26001504.
      View in: PubMed
    6. Stavrakis S, Humphrey MB, Scherlag BJ, Hu Y, Jackman WM, Nakagawa H, Lockwood D, Lazzara R, Po SS. Low-level transcutaneous electrical vagus nerve stimulation suppresses atrial fibrillation. J Am Coll Cardiol. 2015 Mar 10; 65(9):867-75. PMID: 25744003; PMCID: PMC4352201.
    7. Stavrakis S, Nakagawa H, Po SS, Scherlag BJ, Lazzara R, Jackman WM. The role of the autonomic ganglia in atrial fibrillation. JACC Clin Electrophysiol. 2015 Mar-Apr; 1(1-2):1-13. PMID: 26301262.
      View in: PubMed
    8. Ikeda A, Nakagawa H, Lambert H, Shah DC, Fonck E, Yulzari A, Sharma T, Pitha JV, Lazzara R, Jackman WM. Relationship between catheter contact force and radiofrequency lesion size and incidence of steam pop in the beating canine heart: electrogram amplitude, impedance, and electrode temperature are poor predictors of electrode-tissue contact force and lesion size. Circ Arrhythm Electrophysiol. 2014 Dec; 7(6):1174-80. PMID: 25381331.
      View in: PubMed
    9. Li H, Scherlag BJ, Kem DC, Benbrook A, Zhang L, Huang B, Cunningham MW, Lazzara R, Yu X. Atrial tachyarrhythmias induced by the combined effects of ß1/2-adrenergic autoantibodies and thyroid hormone in the rabbit. J Cardiovasc Transl Res. 2014 Aug; 7(6):581-9. PMID: 24903978.
      View in: PubMed
    10. Li H, Scherlag BJ, Kem DC, Zillner C, Male S, Thirunavukkarasu S, Shen X, Benbrook A, Pitha JV, Lazzara R, Yu X. The Propensity for Inducing Atrial Fibrillation: A Comparative Study on Old versus Young Rabbits. J Aging Res. 2014; 2014:684918. PMID: 24719763; PMCID: PMC3955625.
    11. Stavrakis S, Jackman WM, Nakagawa H, Sun Y, Xu Q, Beckman KJ, Lockwood D, Scherlag BJ, Lazzara R, Po SS. Risk of coronary artery injury with radiofrequency ablation and cryoablation of epicardial posteroseptal accessory pathways within the coronary venous system. Circ Arrhythm Electrophysiol. 2014 Feb; 7(1):113-9. PMID: 24365648.
      View in: PubMed
    12. Li H, Scherlag BJ, Kem DC, Benbrook A, Shen X, Cunningham MW, Lazzara R, Aston CE, Yu X. Inducible cardiac arrhythmias caused by enhanced ß1-adrenergic autoantibody expression in the rabbit. Am J Physiol Heart Circ Physiol. 2014 Feb; 306(3):H422-8. PMID: 24271491; PMCID: PMC3920144.
    13. Bhardwaj B, Lazzara R, Stavrakis S. Wide complex tachycardia in the presence of class I antiarrhythmic agents: a diagnostic challenge. Ann Noninvasive Electrocardiol. 2014 May; 19(3):289-92. PMID: 24112534.
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    14. Li H, Scherlag BJ, Kem DC, Zillner C, Male S, Thirunavukkarasu S, Shen X, Pitha JV, Cunningham MW, Lazzara R, Yu X. Atrial tachycardia provoked in the presence of activating autoantibodies to ß2-adrenergic receptor in the rabbit. Heart Rhythm. 2013 Mar; 10(3):436-41. PMID: 23178688; PMCID: PMC3723380.
    15. Stavrakis S, Scherlag BJ, Fan Y, Liu Y, Mao J, Varma V, Lazzara R, Po SS. Inhibition of atrial fibrillation by low-level vagus nerve stimulation: the role of the nitric oxide signaling pathway. J Interv Card Electrophysiol. 2013 Apr; 36(3):199-208. PMID: 23179922.
      View in: PubMed
    16. Stavrakis S, Patel N, Te C, Golwala H, George A, Lozano P, Lazzara R. Development and validation of a prognostic index for risk stratification of patients with early repolarization. Ann Noninvasive Electrocardiol. 2012 Oct; 17(4):361-71. PMID: 23094882.
      View in: PubMed
    17. Chaudhry MA, Smith M, Hanna EB, Lazzara R. Diverse spectrum of presentation of coronary slow flow phenomenon: a concise review of the literature. Cardiol Res Pract. 2012; 2012:383181. PMID: 22645695; PMCID: PMC3356868.
    18. Stavrakis S, Scherlag BJ, Fan Y, Liu Y, Liu Q, Mao J, Cai H, Lazzara R, Po SS. Antiarrhythmic effects of vasostatin-1 in a canine model of atrial fibrillation. J Cardiovasc Electrophysiol. 2012 Jul; 23(7):771-7. PMID: 22487376.
      View in: PubMed
    19. Nakagawa H, Ikeda A, Sharma T, Lazzara R, Jackman WM. Rapid high resolution electroanatomical mapping: evaluation of a new system in a canine atrial linear lesion model. Circ Arrhythm Electrophysiol. 2012 Apr; 5(2):417-24. PMID: 22392447.
      View in: PubMed
    20. Yu L, Scherlag BJ, Sha Y, Li S, Sharma T, Nakagawa H, Jackman WM, Lazzara R, Jiang H, Po SS. Interactions between atrial electrical remodeling and autonomic remodeling: how to break the vicious cycle. Heart Rhythm. 2012 May; 9(5):804-9. PMID: 22214613.
      View in: PubMed
    21. Stavrakis S, Lazzara R, Thadani U. The benefit of cardiac resynchronization therapy and QRS duration: a meta-analysis. J Cardiovasc Electrophysiol. 2012 Feb; 23(2):163-8. PMID: 21815961.
      View in: PubMed
    22. Pakala A, Gupta R, Lazzara R. Primary pericardial sarcoma: a case report and a brief review. Cardiol Res Pract. 2011 Apr 26; 2011:853078. PMID: 21559228; PMCID: PMC3088099.
    23. Lazzara R. Ablation: search and destroy dormant gaps awakened by adenosine. Heart Rhythm. 2011 Sep; 8(9):1434-5. PMID: 21699830.
      View in: PubMed
    24. Scherlag BJ, Nakagawa H, Jackman WM, Lazzara R, Po SS. Non-pharmacological, non-ablative approaches for the treatment of atrial fibrillation: experimental evidence and potential clinical implications. J Cardiovasc Transl Res. 2011 Feb; 4(1):35-41. PMID: 21057908.
      View in: PubMed
    25. Lazzara R. Spatial vectorcardiogram to predict risk for sudden arrhythmic death: phoenix risen from the ashes. Heart Rhythm. 2010 Nov; 7(11):1614-5. PMID: 20870039.
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    26. Dasari TW, Madden G, Lazzara R. A sluggish atrioventricular node. Indian Pacing Electrophysiol J. 2010 Jun 05; 10(6):281-4. PMID: 20552064; PMCID: PMC2880875.
    27. Patterson E, Scherlag BJ, Lazzara R. Stable patterns of AH block arising from longitudinal dissociation and reentry within the superfused rabbit AV junction. J Interv Card Electrophysiol. 2010 Jun; 28(1):5-18. PMID: 20131089.
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    28. Stavrakis S, Kem DC, Patterson E, Lozano P, Huang S, Szabo B, Cunningham MW, Lazzara R, Yu X. Opposing cardiac effects of autoantibody activation of ß-adrenergic and M2 muscarinic receptors in cardiac-related diseases. Int J Cardiol. 2011 May 05; 148(3):331-6. PMID: 20053466; PMCID: PMC3108570.
    29. Ghias M, Scherlag BJ, Lu Z, Niu G, Moers A, Jackman WM, Lazzara R, Po SS. The role of ganglionated plexi in apnea-related atrial fibrillation. J Am Coll Cardiol. 2009 Nov 24; 54(22):2075-83. PMID: 19926016.
      View in: PubMed
    30. Gupta R, Sech C, Lazzara R. Transient cardiac ballooning--the syndrome. Clin Cardiol. 2009 Nov; 32(11):614-20. PMID: 19938049.
      View in: PubMed
    31. Lazzara R. How the heart can fibrillate: when diversity is a disadvantage. Heart Rhythm. 2010; 7(2):258-9. PMID: 20129301.
      View in: PubMed
    32. Stavrakis S, Yu X, Patterson E, Huang S, Hamlett SR, Chalmers L, Pappy R, Cunningham MW, Morshed SA, Davies TF, Lazzara R, Kem DC. Activating autoantibodies to the beta-1 adrenergic and m2 muscarinic receptors facilitate atrial fibrillation in patients with Graves' hyperthyroidism. J Am Coll Cardiol. 2009 Sep 29; 54(14):1309-16. PMID: 19778674; PMCID: PMC2801559.
    33. Scherlag BJ, Nakagawa H, Patterson E, Jackman WM, Lazzara R, Po SS. The Autonomic Nervous System and Atrial Fibrillation:The Roles of Pulmonary Vein Isolation and Ganglionated Plexi Ablation. J Atr Fibrillation. 2009 Aug-Sep; 2(2):177. PMID: 28496632.
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    34. Rathi S, Shakir F, Sech C, Lazzara R. Non-hodgkin lymphoma causing acute myocardial infarction and tachyarrhythmia. Am J Cardiol. 2009 Aug 01; 104(3):450-2. PMID: 19616683.
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    35. Yokoyama K, Nakagawa H, Seres KA, Jung E, Merino J, Zou Y, Ikeda A, Pitha JV, Lazzara R, Jackman WM. Canine model of esophageal injury and atrial-esophageal fistula after applications of forward-firing high-intensity focused ultrasound and side-firing unfocused ultrasound in the left atrium and inside the pulmonary vein. Circ Arrhythm Electrophysiol. 2009 Feb; 2(1):41-9. PMID: 19808443.
      View in: PubMed
    36. Yokoyama K, Nakagawa H, Shah DC, Lambert H, Leo G, Aeby N, Ikeda A, Pitha JV, Sharma T, Lazzara R, Jackman WM. Novel contact force sensor incorporated in irrigated radiofrequency ablation catheter predicts lesion size and incidence of steam pop and thrombus. Circ Arrhythm Electrophysiol. 2008 Dec; 1(5):354-62. PMID: 19808430.
      View in: PubMed
    37. Lu Z, Scherlag BJ, Lin J, Niu G, Fung KM, Zhao L, Ghias M, Jackman WM, Lazzara R, Jiang H, Po SS. Atrial fibrillation begets atrial fibrillation: autonomic mechanism for atrial electrical remodeling induced by short-term rapid atrial pacing. Circ Arrhythm Electrophysiol. 2008 Aug; 1(3):184-92. PMID: 19808412; PMCID: PMC2766842.
    38. Gupta R, Murray C, Lazzara R, Sivaram CA. Acute systolic dysfunction within two weeks of high-dose chemotherapy conditioning before autologous bone marrow transplant: a case report. Echocardiography. 2008 Aug; 25(7):764-7. PMID: 18462404.
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    39. Patterson E, Scherlag BJ, Zhou J, Jackman WM, Lazzara R, Coscia D, Po S. Antifibrillatory actions of cisatracurium: an atrial specific M2 receptor antagonist. J Cardiovasc Electrophysiol. 2008 Aug; 19(8):861-8. PMID: 18363689.
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    40. Patterson E, Lu Z, Lin J, Scherlag BJ, Po SS, Coscia D, Lazzara R. Antifibrillatory properties of mivacurium in a canine model of atrial fibrillation. J Cardiovasc Pharmacol. 2008 Mar; 51(3):293-303. PMID: 18356695.
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    41. Scherlag BJ, Hou YL, Lin J, Lu Z, Zacharias S, Dasari T, Niu G, Ghias M, Patterson E, Jackman WM, Lazzara R, Po SS. An acute model for atrial fibrillation arising from a peripheral atrial site: evidence for primary and secondary triggers. J Cardiovasc Electrophysiol. 2008 May; 19(5):519-27. PMID: 18266671.
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    42. Patterson E, Jackman WM, Beckman KJ, Lazzara R, Lockwood D, Scherlag BJ, Wu R, Po S. Spontaneous pulmonary vein firing in man: relationship to tachycardia-pause early afterdepolarizations and triggered arrhythmia in canine pulmonary veins in vitro. J Cardiovasc Electrophysiol. 2007 Sep; 18(10):1067-75. PMID: 17655663.
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    43. Zhou J, Scherlag BJ, Edwards J, Jackman WM, Lazzara R, Po SS. Gradients of atrial refractoriness and inducibility of atrial fibrillation due to stimulation of ganglionated plexi. J Cardiovasc Electrophysiol. 2007 Jan; 18(1):83-90. PMID: 17229305.
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    44. Hou Y, Scherlag BJ, Lin J, Zhou J, Song J, Zhang Y, Patterson E, Lazzara R, Jackman WM, Po SS. Interactive atrial neural network: Determining the connections between ganglionated plexi. Heart Rhythm. 2007 Jan; 4(1):56-63. PMID: 17198991.
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    45. Zhou J, Scherlag BJ, Yamanashi W, Wu R, Huang Y, Lazzara R, Jackman WM, Po SS. Experimental model simulating right ventricular outflow tract tachycardia: a novel technique to initiate RVOT-VT. J Cardiovasc Electrophysiol. 2006 Jul; 17(7):771-5. PMID: 16836676.
      View in: PubMed
    46. Patterson E, Lazzara R, Szabo B, Liu H, Tang D, Li YH, Scherlag BJ, Po SS. Sodium-calcium exchange initiated by the Ca2+ transient: an arrhythmia trigger within pulmonary veins. J Am Coll Cardiol. 2006 Mar 21; 47(6):1196-206. PMID: 16545652.
      View in: PubMed
    47. Po SS, Scherlag BJ, Yamanashi WS, Edwards J, Zhou J, Wu R, Geng N, Lazzara R, Jackman WM. Experimental model for paroxysmal atrial fibrillation arising at the pulmonary vein-atrial junctions. Heart Rhythm. 2006 Feb; 3(2):201-8. PMID: 16443537.
      View in: PubMed
    48. Yokoyama K, Nakagawa H, Wittkampf FH, Pitha JV, Lazzara R, Jackman WM. Comparison of electrode cooling between internal and open irrigation in radiofrequency ablation lesion depth and incidence of thrombus and steam pop. Circulation. 2006 Jan 03; 113(1):11-9. PMID: 16380552.
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    49. Aoyama H, Nakagawa H, Pitha JV, Khammar GS, Chandrasekaran K, Matsudaira K, Yagi T, Yokoyama K, Lazzara R, Jackman WM. Comparison of cryothermia and radiofrequency current in safety and efficacy of catheter ablation within the canine coronary sinus close to the left circumflex coronary artery. J Cardiovasc Electrophysiol. 2005 Nov; 16(11):1218-26. PMID: 16302908.
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    50. Scherlag BJ, Nakagawa H, Jackman WM, Yamanashi WS, Patterson E, Po S, Lazzara R. Electrical stimulation to identify neural elements on the heart: their role in atrial fibrillation. J Interv Card Electrophysiol. 2005 Aug; 13 Suppl 1:37-42. PMID: 16133854.
      View in: PubMed
    51. Patterson E, Po SS, Scherlag BJ, Lazzara R. Triggered firing in pulmonary veins initiated by in vitro autonomic nerve stimulation. Heart Rhythm. 2005 Jun; 2(6):624-31. PMID: 15922271.
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    52. Scherlag BJ, Yamanashi WS, Amin R, Lazzara R, Jackman WM. Experimental model of inappropriate sinus tachycardia: initiation and ablation. J Interv Card Electrophysiol. 2005 Jun; 13(1):21-9. PMID: 15976974.
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    53. Hasdemir C, Priori SG, Overholt E, Lazzara R. Catecholaminergic polymorphic ventricular tachycardia, recurrent syncope, and implantable loop recorder. J Cardiovasc Electrophysiol. 2004 Jun; 15(6):729. PMID: 15175074.
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    54. Nakagawa H, Aoyama H, Beckman KJ, Po SS, Wu R, Lockwood D, Spector P, Calame JD, Lustgarten DL, Herring L, Hasdemir C, Singh D, Lazzara R, Jackman WM. Relation between pulmonary vein firing and extent of left atrial-pulmonary vein connection in patients with atrial fibrillation. Circulation. 2004 Mar 30; 109(12):1523-9. PMID: 15023867.
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    55. Scherlag BJ, Yamanashi WS, Yagi T, Patterson E, Lazzara R, Jackman WM. Variability of AV nodal potentials recorded, in vivo: direct demonstration of dual AV nodal physiology. J Interv Card Electrophysiol. 2004 Feb; 10(1):9-18. PMID: 14739744.
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    56. Hasdemir C, Chandrasekaran K, Lazzara R, Reynolds DW. Sinus node dysfunction in a heart transplant patient secondary to severe sinus node artery obstruction--a case report. Angiology. 2003 Nov-Dec; 54(6):725-8. PMID: 14666963.
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    57. Swann MH, Nakagawa H, Vanoli E, Lazzara R, Schwartz PJ, Adamson PB. Heterogeneous regional endocardial repolarization is associated with increased risk for ischemia-dependent ventricular fibrillation after myocardial infarction. J Cardiovasc Electrophysiol. 2003 Aug; 14(8):873-9. PMID: 12890052.
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    58. Matsudaira K, Nakagawa H, Wittkampf FH, Yamanashi WS, Imai S, Pitha JV, Lazzara R, Jackman WM. High incidence of thrombus formation without impedance rise during radiofrequency ablation using electrode temperature control. Pacing Clin Electrophysiol. 2003 May; 26(5):1227-37. PMID: 12765451.
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    59. Hasdemir C, Scherlag BJ, Yamanashi WS, Lazzara R, Jackman WM. Endovascular stimulation of autonomic neural elements in the superior vena cava using a flexible loop catheter. Jpn Heart J. 2003 May; 44(3):417-27. PMID: 12825809.
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    60. Sun Y, Arruda M, Otomo K, Beckman K, Nakagawa H, Calame J, Po S, Spector P, Lustgarten D, Herring L, Lazzara R, Jackman W. Coronary sinus-ventricular accessory connections producing posteroseptal and left posterior accessory pathways: incidence and electrophysiological identification. Circulation. 2002 Sep 10; 106(11):1362-7. PMID: 12221053.
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    61. Scherlag BJ, Patterson E, Jackman WM, Lazzara R. The elusive extracellular AV nodal potential: studies from the canine heart, ex vivo. J Interv Card Electrophysiol. 2002 Aug; 7(1):39-52. PMID: 12391419.
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    62. Scherlag BJ, Yamanashi WS, Schauerte P, Scherlag M, Sun YX, Hou Y, Jackman WM, Lazzara R. Endovascular stimulation within the left pulmonary artery to induce slowing of heart rate and paroxysmal atrial fibrillation. Cardiovasc Res. 2002 May; 54(2):470-5. PMID: 12062352.
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    63. Hasdemir C, Shah N, Rao AP, Acosta H, Matsudaira K, Neas BR, Reynolds DW, Po S, Lazzara R, Beckman KJ. Analysis of troponin I levels after spontaneous implantable cardioverter defibrillator shocks. J Cardiovasc Electrophysiol. 2002 Feb; 13(2):144-50. PMID: 11900289.
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