- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT00291174
Measuring Electrical Resistance of Different Tissues on the Outer Surface of the Heart
Impedance Measurement of Epicardial Substrate for Ventricular Arrhythmias: Case Control Series of Patients With and Without Myocardial Scarring
Study Overview
Status
Detailed Description
The treatment of cardiac arrhythmias with endocardial catheter ablation has evolved rapidly over the past few decades. At the time of this writing, the ablation of almost all atrial and ventricular arrhythmias has been described in the literature. Multiple energy modalities (e.g. radiofrequency, cryotherapy) and approaches (e.g. retrograde aortic, transseptal puncture) have been described, yet ablation of some rhythms is not as successful as others.
The realization that ventricular tachycardia (VT) in the setting of Chagas Disease can originate in the epicardium has lead to the development of a percutaneous, transthoracic epicardial approach to mapping and ablation of this arrhythmia. This approach has now been applied to patients with VT in the setting of ischemic and nonischemic heart disease at many centers throughout the world. Traditional mapping technologies are utilized on the epicardium to define scarred heart tissue and locate the VT circuit.
It is well known that human hearts display a variable amount of fat overlying the epicardium. Not only is the coronary vasculature embedded in a layer of adipose tissue, but the rest of the heart may have areas of epicardial fat. As fat is an insulator and does not generate or easily conduct electrical activity, current mapping techniques may classify epicardial fat incorrectly as myocardial scar. This may have important effects on the ability to diagnose and treat arrhythmias with epicardial ablation.
Study Type
Enrollment (Actual)
Contacts and Locations
Study Locations
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Pennsylvania
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Philadelphia, Pennsylvania, United States, 19104
- Hospital of the University of Pennsylvania
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Participation Criteria
Eligibility Criteria
Ages Eligible for Study
Accepts Healthy Volunteers
Genders Eligible for Study
Sampling Method
Study Population
Description
Inclusion Criteria:
- All adult patients undergoing elective cardiac surgery for coronary artery disease (with or without normal heart function) or valvular disease (with normal heart function) at the Hospital of the University of Pennsylvania under the direction of Y. Joseph Woo MD will be eligible.
Exclusion Criteria:
- Patients undergoing emergent surgery and patients with idiopathic cardiomyopathy, infiltrative cardiomyopathies and hypertrophic cardiomyopathies will be excluded.
Study Plan
How is the study designed?
Design Details
Collaborators and Investigators
Sponsor
Collaborators
Investigators
- Principal Investigator: David J. Callans, MD, University of Pennsylvania, Dept of Medicine, Cardiology Division
Publications and helpful links
General Publications
- Sosa E, Scanavacca M, d'Avila A, Pilleggi F. A new technique to perform epicardial mapping in the electrophysiology laboratory. J Cardiovasc Electrophysiol. 1996 Jun;7(6):531-6. doi: 10.1111/j.1540-8167.1996.tb00559.x.
- Soejima K, Stevenson WG, Sapp JL, Selwyn AP, Couper G, Epstein LM. Endocardial and epicardial radiofrequency ablation of ventricular tachycardia associated with dilated cardiomyopathy: the importance of low-voltage scars. J Am Coll Cardiol. 2004 May 19;43(10):1834-42. doi: 10.1016/j.jacc.2004.01.029.
- Dixit S, Narula N, Callans DJ, Marchlinski FE. Electroanatomic mapping of human heart: epicardial fat can mimic scar. J Cardiovasc Electrophysiol. 2003 Oct;14(10):1128. doi: 10.1046/j.1540-8167.2003.03138.x. No abstract available.
- Zarowitz BJ, Pilla AM. Bioelectrical impedance in clinical practice. DICP. 1989 Jul-Aug;23(7-8):548-55. doi: 10.1177/1060028089023007-803.
- Casas O, Bragos R, Riu PJ, Rosell J, Tresanchez M, Warren M, Rodriguez-Sinovas A, Carreno A, Cinca J. In vivo and in situ ischemic tissue characterization using electrical impedance spectroscopy. Ann N Y Acad Sci. 1999 Apr 20;873:51-8. doi: 10.1111/j.1749-6632.1999.tb09448.x.
- Cinca J, Warren M, Carreno A, Tresanchez M, Armadans L, Gomez P, Soler-Soler J. Changes in myocardial electrical impedance induced by coronary artery occlusion in pigs with and without preconditioning: correlation with local ST-segment potential and ventricular arrhythmias. Circulation. 1997 Nov 4;96(9):3079-86. doi: 10.1161/01.cir.96.9.3079.
- Cinca J, Warren M, Rodriguez-Sinovas A, Tresanchez M, Carreno A, Bragos R, Casas O, Domingo A, Soler-Soler J. Passive transmission of ischemic ST segment changes in low electrical resistance myocardial infarct scar in the pig. Cardiovasc Res. 1998 Oct;40(1):103-12. doi: 10.1016/s0008-6363(98)00145-x.
- Ellenby MI, Small KW, Wells RM, Hoyt DJ, Lowe JE. On-line detection of reversible myocardial ischemic injury by measurement of myocardial electrical impedance. Ann Thorac Surg. 1987 Dec;44(6):587-97. doi: 10.1016/s0003-4975(10)62141-8.
- Fallert MA, Mirotznik MS, Downing SW, Savage EB, Foster KR, Josephson ME, Bogen DK. Myocardial electrical impedance mapping of ischemic sheep hearts and healing aneurysms. Circulation. 1993 Jan;87(1):199-207. doi: 10.1161/01.cir.87.1.199.
- Kleber AG, Riegger CB, Janse MJ. Electrical uncoupling and increase of extracellular resistance after induction of ischemia in isolated, arterially perfused rabbit papillary muscle. Circ Res. 1987 Aug;61(2):271-9. doi: 10.1161/01.res.61.2.271.
- Salazar Y, Bragos R, Casas O, Cinca J, Rosell J. Transmural versus nontransmural in situ electrical impedance spectrum for healthy, ischemic, and healed myocardium. IEEE Trans Biomed Eng. 2004 Aug;51(8):1421-7. doi: 10.1109/TBME.2004.828030.
- Salazar Y, Cinca J, Rosell-Ferrer J. Effect of electrode locations and respiration in the characterization of myocardial tissue using a transcatheter impedance method. Physiol Meas. 2004 Oct;25(5):1095-103. doi: 10.1088/0967-3334/25/5/001.
- Schwartzman D, Chang I, Michele JJ, Mirotznik MS, Foster KR. Electrical impedance properties of normal and chronically infarcted left ventricular myocardium. J Interv Card Electrophysiol. 1999 Oct;3(3):213-24. doi: 10.1023/a:1009887306055.
- Warren M, Bragos R, Casas O, Rodriguez-Sinovas A, Rosell J, Anivarro I, Cinca J. Percutaneous electrocatheter technique for on-line detection of healed transmural myocardial infarction. Pacing Clin Electrophysiol. 2000 Aug;23(8):1283-7. doi: 10.1111/j.1540-8159.2000.tb00945.x.
- Wolf T, Gepstein L, Hayam G, Zaretzky A, Shofty R, Kirshenbaum D, Uretzky G, Oron U, Ben-Haim SA. Three-dimensional endocardial impedance mapping: a new approach for myocardial infarction assessment. Am J Physiol Heart Circ Physiol. 2001 Jan;280(1):H179-88. doi: 10.1152/ajpheart.2001.280.1.H179.
- Wolf T, Gepstein L, Dror U, Hayam G, Shofti R, Zaretzky A, Uretzky G, Oron U, Ben-Haim SA. Detailed endocardial mapping accurately predicts the transmural extent of myocardial infarction. J Am Coll Cardiol. 2001 May;37(6):1590-7. doi: 10.1016/s0735-1097(01)01209-8.
- Zhu F, Leonard EF, Levin NW. Body composition modeling in the calf using an equivalent circuit model of multi-frequency bioimpedance analysis. Physiol Meas. 2005 Apr;26(2):S133-43. doi: 10.1088/0967-3334/26/2/013. Epub 2005 Mar 29.
Study record dates
Study Major Dates
Study Start
Primary Completion (Actual)
Study Completion (Actual)
Study Registration Dates
First Submitted
First Submitted That Met QC Criteria
First Posted (Estimate)
Study Record Updates
Last Update Posted (Estimate)
Last Update Submitted That Met QC Criteria
Last Verified
More Information
Terms related to this study
Keywords
Additional Relevant MeSH Terms
Other Study ID Numbers
- 803272
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