B' ΚΑΡΔΙΟΛΟΓΙΚΟ ΤΜΗΜΑ
ΤΟΜΕΑΣ ΕΠΕΜΒΑΤΙΚΗΣ ΗΛΕΚΤΡΟΦΥΣΙΟΛΟΓΙΑΣ

Γ.Ν.Α. ‘‘Ο ΕΥΑΓΓΕΛΙΣΜΟΣ - ΟΦΘΑΛΜΙΑΤΡΕΙΟ ΑΘΗΝΩΝ - ΠΟΛΥΚΛΙΝΙΚΗ"

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ΚΑΡΔΙΟΛΟΓΟΣ - ΑΡΡΥΘΜΙΟΛΟΓΟΣ

Αποφοίτησε από την Ιατρική Σχολή του Πανεπιστήμιου Ιωαννίνων το 1997. Το 2003 ολοκλήρωσε την διδακτορική του διατριβή στην Ιατρική Σχολή του Πανεπιστημίου Ιωαννίνων. Έλαβε τον τίτλο της ειδικότητας στην Καρδιολογία το 2007 και μετεκπαιδεύτηκε στην Επεμβατική Ηλεκτροφυσιολογία στην Γερμανία (Universitäts-Herzzentrum Freiburg - Bad Krozingen) στα πλαίσια υποτροφίας της Ευρωπαϊκής Καρδιολογικής Εταιρείας (ESC-EHRA). Το 2009 έλαβε την πιστοποίηση της Ευρωπαϊκής Αρρυθμιολογικής Εταιρείας (EHRA) στην Επεμβατική Ηλεκτροφυσιολογία. Από το 2009 εργάζεται ως Επιμελητής στην Β’ Καρδιολογική Κλινική του Γ.Ν.Α. «Ευαγγελισμός» και πιο συγκεκριμένα στο εργαστήριο Επεμβατικής Ηλεκτροφυσιολογίας. Ασχολείται με την κατάλυση συμβατικών και σύμπλοκων αρρυθμιών με την χρήση σύγχρονων συστημάτων χαρτογράφησης καθώς και με την εμφύτευση ηλεκτροφυσιολογικών συσκευών (βηματοδοτών, απινιδωτών). Είναι υπεύθυνος του ιατρείου κληρονομικών ηλεκτρικών νοσημάτων της καρδιάς και αιφνίδιου καρδιακού θανάτου του Γ.Ν.Α. «Ευαγγελισμός». Εκπροσώπησε την Ελλάδα στην ομάδα των νέων ηλεκτροφυσιολόγων της Ευρωπαϊκής Αρρυθμιολογικής Εταιρείας (EHRA) (2013-2017). Αποτελεί μέλος της εξεταστικής επιτροπής της Ευρωπαϊκής Αρρυθμιολογικής Εταιρείας (EHRA) για την πιστοποίηση στην εξειδίκευση της Επεμβατικής Hλεκτροφυσιολογίας. Είναι Fellow της Ευρωπαϊκής Καρδιολογικής Εταιρείας (FESC) και της Ευρωπαϊκής Αρρυθμιολογικής Εταιρείας (FEHRA). Το ερευνητικό του ενδιαφέρον εστιάζεται στην κατάλυση της κολπικής μαρμαρυγής και στο σύνδρομο Brugada. Έχει περισσότερες από 180 δημοσιεύσεις σε διεθνή ιατρικά περιοδικά.

ΔΗΜΟΣΙΕΥΣΕΙΣ

Low dose dabigatran versus uninterrupted acenocoumarol for peri-procedural anticoagulation in atrial fibrillation catheter ablation.
Efremidis M, Vlachos K, Letsas KP, Giannopoulos G, Lioni L, Georgopoulos S, Vadiaka M, Deftereos S, Sideris A.
J Electrocardiol. 2015 Jun 19. pii: S0022-0736(15)00194-6. doi: 10.1016/j.jelectrocard.2015.06.011. [Epub ahead of print]
PMID: 26152604

Gastroesophageal reflux disease and atrial fibrillation.
Letsas KP, Efremidis M, Sideris A.
Int J Cardiol. 2015 Jul 2;198:31. doi: 10.1016/j.ijcard.2015.05.189. [Epub ahead of print] No abstract available.
PMID: 26149335

Association Between rs2200733 Polymorphism on Chromosome 4q25 and Atrial Fibrillation in a Greek Population.
Kalinderi K, Fragakis N, Koskinas KC, Katritsis D, Letsas K, Efremidis M, Korantzopoulos P, Rossios K, Pagourelias E, Giannakopoulou P, Mavroudi M, Kyriakou P, Skeberis V, Geleris P, Vassilikos V, Fidani L.
Hellenic J Cardiol. 2015 May-Jun;56(3):224-9.
PMID: 26021244 Free Article

Meta-Analysis on Risk Stratification of Asymptomatic Individuals With the Brugada Phenotype.
Letsas KP, Liu T, Shao Q, Korantzopoulos P, Giannopoulos G, Vlachos K, Georgopoulos S, Trikas A, Efremidis M, Deftereos S, Sideris A.
Am J Cardiol. 2015 Jul 1;116(1):98-103. doi: 10.1016/j.amjcard.2015.03.044. Epub 2015 Apr 8.
PMID: 25933735

Amino-terminal B-natriuretic peptide levels and postablation recurrence in hypertensive patients with paroxysmal atrial fibrillation.
Giannopoulos G, Kossyvakis C, Angelidis C, Efremidis M, Panagopoulou V, Letsas K, Bouras G, Vassilikos VP, Goudevenos J, Tousoulis D, Lekakis J, Deftereos S.
Heart Rhythm. 2015 Jul;12(7):1470-5. doi: 10.1016/j.hrthm.2015.04.002. Epub 2015 Apr 3.
PMID: 25847478

Catheter ablation of persistent atrial fibrillation: The importance of substrate modification.
Letsas KP, Efremidis M, Sgouros NP, Vlachos K, Asvestas D, Sideris A.
World J Cardiol. 2015 Mar 26;7(3):111-8. doi: 10.4330/wjc.v7.i3.111.
PMID: 25810810 Free PMC Article

Early pulmonary vein reconnection as a predictor of left atrial ablation outcomes for paroxysmal atrial fibrillation.
Efremidis M, Letsas K, Giannopoulos G, Lioni L, Vlachos K, Asvestas D, Karlis D, Kareliotis V, Geladari H, Sideris A, Deftereos S.
Europace. 2015 May;17(5):741-6. doi: 10.1093/europace/euu216. Epub 2015 Feb 16.
PMID: 25687747

Gastroesophageal reflux disease is a predictor of atrial fibrillation recurrence following left atrial ablation.
Lioni L, Letsas KP, Efremidis M, Vlachos K, Karlis D, Asvestas D, Mihas CC, Sideris A.
Int J Cardiol. 2015 Mar 15;183:211-3. doi: 10.1016/j.ijcard.2015.01.083. Epub 2015 Jan 29. No abstract available.
PMID: 25675903

Catheter ablation of atrial fibrillation in the elderly.
Lioni L, Letsas KP, Efremidis M, Vlachos K, Giannopoulos G, Kareliotis V, Deftereos S, Sideris A.
J Geriatr Cardiol. 2014 Dec;11(4):291-5. doi: 10.11909/j.issn.1671-5411.2014.04.003.
PMID: 25593577 Free PMC Article

Differences in quality of life, anxiety and depression in patients with paroxysmal atrial fibrillation and common forms of atrioventricular reentry supraventricular tachycardias.
Lioni L, Vlachos K, Letsas KP, Efremidis M, Karlis D, Asvestas D, Kareliotis V, Xydonas S, Dimopoulos N, Korantzopoulos P, Trikas A, Sideris A.
Indian Pacing Electrophysiol J. 2014 Oct 6;14(5):250-7. eCollection 2014 Sep.
PMID: 25408565 Free PMC Article

Post myocardial infarction risk stratification for sudden cardiac death in patients with preserved ejection fraction: PRESERVE-EF study design.
Gatzoulis KA, Tsiachris D, Arsenos P, Dilaveris P, Sideris S, Simantirakis E, Efremidis M, Dagres N, Korantzopoulos P, Fragkakis N, Letsas K, Flevari P, Vasilikos V, Sideris A, Iliodromitis E, Goudevenos I, Lekakis I, Vardas P, Kallikazaros I, Stefanadis C.
Hellenic J Cardiol. 2014 Sep-Oct;55(5):361-8. No abstract available.
PMID: 25243434 Free Article

Central sympathetic inhibition to reduce postablation atrial fibrillation recurrences in hypertensive patients: a randomized, controlled study.
Giannopoulos G, Kossyvakis C, Efremidis M, Katsivas A, Panagopoulou V, Doudoumis K, Raisakis K, Letsas K, Rentoukas I, Pyrgakis V, Manolis AS, Tousoulis D, Stefanadis C, Deftereos S.
Circulation. 2014 Oct 14;130(16):1346-52. doi: 10.1161/CIRCULATIONAHA.114.010999. Epub 2014 Aug 21.
PMID: 25147079

Exhaled breath condensate in acute and chronic heart failure: new insights into the role of lung injury and barrier dysfunction.
Pappas LK, Giannopoulos G, Loukides S, Gavrielatos G, Athanasopoulou E, Alexanian IP, Farmakis D, Korovesi I, Letsas KP, Parissis JT, Deftereos S, Pyrgakis VN, Kotanidou A, Kremastinos DT, Filippatos GS.
Am J Respir Crit Care Med. 2014 Aug 1;190(3):342-5. doi: 10.1164/rccm.201402-0272LE. No abstract available.
PMID: 25084262

Headache: An unusual presentation of acute myocardial infraction.
Asvestas D, Vlachos K, Salachas A, Letsas KP, Sideris A.
World J Cardiol. 2014 Jun 26;6(6):514-6. doi: 10.4330/wjc.v6.i6.514.
PMID: 24976924 Free PMC Article

Prospective European survey on atrial fibrillation ablation: clinical characteristics of patients and ablation strategies used in different countries.
Themistoclakis S, Raviele A, China P, Pappone C, De Ponti R, Revishvili A, Aliot E, Kuck KH, Hoff PI, Shah D, Almendral J, Manolis AS, Chierchia GB, Oto A, Vatasescu RG, Sinkovec M, Cappato R; Atrial Fibrillation Survey Investigators.
J Cardiovasc Electrophysiol. 2014 Oct;25(10):1074-81. doi: 10.1111/jce.12462. Epub 2014 Jul 8.
PMID: 24891043

Association of quality of life, anxiety, and depression with left atrial ablation outcomes.
Efremidis M, Letsas KP, Lioni L, Giannopoulos G, Korantzopoulos P, Vlachos K, Dimopoulos NP, Karlis D, Bouras G, Sideris A, Deftereos S.
Pacing Clin Electrophysiol. 2014 Jun;37(6):703-11. doi: 10.1111/pace.12420. Epub 2014 May 9.
PMID: 24809737

Electrocardiographic characteristics of premature ventricular contractions in subjects with type 1 pattern of Brugada syndrome.
Letsas KP, Asvestas D, Vlachos K, Karlis D, Korantzopoulos P, Efremidis M, Sideris A.
J Electrocardiol. 2014 May-Jun;47(3):351-5. doi: 10.1016/j.jelectrocard.2014.02.012. Epub 2014 Mar 2.
PMID: 24636795

The impact of catheter ablation in the interpulmonary isthmus on atrial fibrillation ablation outcomes: a randomized study.
Letsas KP, Efremidis M, Vlachos K, Karlis D, Lioni L, Asvestas D, Valkanas K, Mihas CC, Sideris A.
J Cardiovasc Electrophysiol. 2014 Jul;25(7):709-13. doi: 10.1111/jce.12399. Epub 2014 Mar 28.
PMID: 24597730

The atrial fibrillation ablation pilot study: a European Survey on Methodology and results of catheter ablation for atrial fibrillation conducted by the European Heart Rhythm Association.
Arbelo E, Brugada J, Hindricks G, Maggioni AP, Tavazzi L, Vardas P, Laroche C, Anselme F, Inama G, Jais P, Kalarus Z, Kautzner J, Lewalter T, Mairesse GH, Perez-Villacastin J, Riahi S, Taborsky M, Theodorakis G, Trines SA; Atrial Fibrillation Ablation Pilot Study Investigators.
Eur Heart J. 2014 Jun 7;35(22):1466-78. doi: 10.1093/eurheartj/ehu001. Epub 2014 Jan 31.
PMID: 24487524 Free Article

Endocardial late potentials during sinus rhythm define the re-entry circuit of ventricular tachycardia in arrhythmogenic right ventricular cardiomyopathy.
Efremidis M, Prappa E, Charalampous C, Protonotarios N, Letsas KP, Sideris A.
Hellenic J Cardiol. 2013 Sep-Oct;54(5):394-6.
PMID: 24100184 Free Article

Drug-induced Brugada syndrome by noncardiac agents.
Letsas KP, Kavvouras C, Kollias G, Tsikrikas S, Korantzopoulos P, Efremidis M, Sideris A.
Pacing Clin Electrophysiol. 2013 Dec;36(12):1570-7. doi: 10.1111/pace.12234. Epub 2013 Aug 30. Review.
PMID: 23992531

Ibutilide and novel indexes of ventricular repolarization in persistent atrial fibrillation patients.
Korantzopoulos P, Letsas KP, Kotsia A, Baltogiannis G, Kalantzi K, Kyrlas K, Goudevenos JA.
World J Cardiol. 2013 Jul 26;5(7):242-6. doi: 10.4330/wjc.v5.i7.242.
PMID: 23888193 Free PMC Article

The impact of vagotonic, adrenergic, and random type of paroxysmal atrial fibrillation on left atrial ablation outcomes.
Efremidis M, Letsas KP, Lioni L, Deftereos S, Giannopoulos G, Kossyvakis C, Tsikrikas S, Charalampous C, Kollias G, Xydonas S, Synetos A, Sideris A, Toutouzas K, Stefanadis C.
Int J Cardiol. 2013 Oct 9;168(4):4015-8. doi: 10.1016/j.ijcard.2013.06.075. Epub 2013 Jul 17.
PMID: 23870637

Mechanisms of drug-induced proarrhythmia in clinical practice.
Konstantopoulou A, Tsikrikas S, Asvestas D, Korantzopoulos P, Letsas KP.
World J Cardiol. 2013 Jun 26;5(6):175-85. doi: 10.4330/wjc.v5.i6.175.
PMID: 23847724 Free PMC Article

CHADS2 and CHA2DS2-VASc scores as predictors of left atrial ablation outcomes for paroxysmal atrial fibrillation.
Letsas KP, Efremidis M, Giannopoulos G, Deftereos S, Lioni L, Korantzopoulos P, Vlachos K, Xydonas S, Kossyvakis C, Sideris A.
Europace. 2014 Feb;16(2):202-7. doi: 10.1093/europace/eut210. Epub 2013 Jun 28.
PMID: 23813452 Free Article

Idiopathic ventricular tachycardia arising from the right ventricular apex.
Letsas KP, Efremidis M, Tsikrikas S, Sideris A.
Indian Pacing Electrophysiol J. 2013 Mar;13(2):80-3. Epub 2013 Mar 7.
PMID: 23573062 Free PMC Article

The epidemiology of atrial fibrillation in end-stage renal disease.
Korantzopoulos P, Liu T, Letsas KP, Fragakis N, Kyrlas K, Goudevenos JA.
J Nephrol. 2013 Jul-Aug;26(4):617-23. doi: 10.5301/jn.5000270. Epub 2013 Apr 3. Review.
PMID: 23553528

Sinus node disease in subjects with type 1 ECG pattern of Brugada syndrome.
Letsas KP, Korantzopoulos P, Efremidis M, Weber R, Lioni L, Bakosis G, Vassilikos VP, Deftereos S, Sideris A, Arentz T.
J Cardiol. 2013 Mar;61(3):227-31. doi: 10.1016/j.jjcc.2012.12.006. Epub 2013 Feb 9.
PMID: 23403368 Free Article

The impact of hemodialysis on the dispersion of ventricular repolarization.
Kalantzi K, Gouva C, Letsas KP, Vlachopanou A, Foulidis V, Bechlioulis A, Katopodis KP, Goudevenos JA, Korantzopoulos P.
Pacing Clin Electrophysiol. 2013 Mar;36(3):322-7. doi: 10.1111/pace.12066. Epub 2013 Jan 10.
PMID: 23305256

Pacemaker lead perforation into the right lung.
Xydonas S, Letsas KP, Tsikrikas S, Charitos C, Sideris A.
Ann Thorac Surg. 2012 Dec;94(6):2130. doi: 10.1016/j.athoracsur.2012.04.131. No abstract available.
PMID: 23176934

Pacing-facilitated proarrhythmia.
Tsikrikas S, Bramos D, Kollias G, Letsas KP, Efremidis M, Sideris A.
Hellenic J Cardiol. 2012 Jul-Aug;53(4):327-8.
PMID: 22796822 Free Article

Xanthine oxidase and uric Acid in atrial fibrillation.
Korantzopoulos P, Letsas KP, Liu T.
Front Physiol. 2012 May 24;3:150. doi: 10.3389/fphys.2012.00150. eCollection 2012. No abstract available.
PMID: 22654765 Free PMC Article

ESC-EURObservational Research Programme: the Atrial Fibrillation Ablation Pilot Study, conducted by the European Heart Rhythm Association.
Arbelo E, Brugada J, Hindricks G, Maggioni A, Tavazzi L, Vardas P, Anselme F, Inama G, Jais P, Kalarus Z, Kautzner J, Lewalter T, Mairesse G, Perez-Villacastin J, Riahi S, Taborsky M, Theodorakis G, Trines S; Atrial Fibrillation Ablation Pilot Study Investigators.
Europace. 2012 Aug;14(8):1094-103. Epub 2012 May 24.
PMID: 22628450 Free Article

Isolation of a pulmonary vein originating from the roof of the left atrium.
Efremidis M, Letsas K, Kollias G, Skoufogianni P, Sideris A.
Hellenic J Cardiol. 2012 Jan-Feb;53(1):72-3. No abstract available.
PMID: 22275746 Free Article

Novel indexes of heterogeneity of ventricular repolarization in subjects with early repolarization pattern.
Letsas KP, Charalampous C, Korantzopoulos P, Tsikrikas S, Bramos D, Kollias G, Efremidis M, Sideris A.
Europace. 2012 Jun;14(6):877-81. doi: 10.1093/europace/eur390. Epub 2011 Dec 19.
PMID: 22186777 Free Article

Single right coronary artery.
Tsikrikas S, Bramos D, Rouska E, Letsas KP, Gavaliatsis IP, Sideris A.
Hellenic J Cardiol. 2011 Sep-Oct;52(5):475. No abstract available.
PMID: 21940300 Free Article

Methods and indications for ablation of ventricular tachycardia.
Letsas KP, Charalampous C, Weber R, Tsikrikas S, Efremidis M, Arentz T, Sideris A.
Hellenic J Cardiol. 2011 Sep-Oct;52(5):427-36. Review. No abstract available.
PMID: 21940290 Free Article

Gender effects on novel indexes of heterogeneity of repolarization in patients with stable coronary artery disease.
Korantzopoulos P, Letsas KP, Christogiannis Z, Kalantzi K, Massis I, Goudevenos JA.
Hellenic J Cardiol. 2011 Jul-Aug;52(4):311-5.
PMID: 21933762 Free Article

Anticoagulation and antiplatelet therapy in implantation of electrophysiological devices.
Korantzopoulos P, Letsas KP, Liu T, Fragakis N, Efremidis M, Goudevenos JA.
Europace. 2011 Dec;13(12):1669-80. doi: 10.1093/europace/eur210. Epub 2011 Jul 25. Review.
PMID: 21788280 Free Article

The impact of body mass index on the efficacy and safety of catheter ablation of atrial fibrillation.
Letsas KP, Siklódy CH, Korantzopoulos P, Weber R, Bürkle G, Mihas CC, Kalusche D, Arentz T.
Int J Cardiol. 2013 Mar 20;164(1):94-8. doi: 10.1016/j.ijcard.2011.06.092. Epub 2011 Jul 2.
PMID: 21726910

Epicardial ventricular tachycardia ablation: the last frontier in interventional electrophysiology?
Efremidis M, Letsas KP, Tsikrikas S, Charalampous C, Sideris A.
Hellenic J Cardiol. 2011 May-Jun;52(3):253-5. Review. No abstract available.
PMID: 21642074 Free Article

Electrocardiographic and electrophysiologic characteristics of ventricular extrasystoles arising from the aortomitral continuity.
Letsas KP, Efremidis M, Kollias G, Xydonas S, Sideris A.
Cardiol Res Pract. 2011;2011:864964. doi: 10.4061/2011/864964. Epub 2011 May 24.
PMID: 21637720 Free PMC Article

Osborn waves.
Tsikrikas S, Lavos N, Koutras K, Letsas KP, Sideris A.
Angiology. 2011 Oct;62(7):588-9. doi: 10.1177/0003319711401372. Epub 2011 May 8. No abstract available.
PMID: 21555315

Sustained polymorphic ventricular tachycardia induced during radiofrequency catheter ablation of idiopathic right ventricular outflow tract extrasystoles.
Letsas KP, Efremidis M, Bramos D, Charalampous C, Tsikrikas S, Skoufogianni P, Sideris A.
Indian Pacing Electrophysiol J. 2011 Mar 25;11(2):56-8. No abstract available.
PMID: 21468250 Free PMC Article

Long-term prognosis of asymptomatic individuals with spontaneous or drug-induced type 1 electrocardiographic phenotype of Brugada syndrome.
Letsas KP, Weber R, Efremidis M, Korantzopoulos P, Astheimer K, Charalampous C, Tsikrikas S, Fragakis N, Kalusche D, Sideris A, Arentz T.
J Electrocardiol. 2011 May-Jun;44(3):346-9. doi: 10.1016/j.jelectrocard.2010.12.007. Epub 2011 Mar 21.
PMID: 21419423

Current ablation strategies for persistent and long-standing persistent atrial fibrillation.
Letsas KP, Efremidis M, Charalampous C, Tsikrikas S, Sideris A.
Cardiol Res Pract. 2011 Mar 3;2011:376969. doi: 10.4061/2011/376969.
PMID: 21403874 Free PMC Article

Epsilon-like waves and ventricular conduction abnormalities in subjects with type 1 ECG pattern of Brugada syndrome.
Letsas KP, Efremidis M, Weber R, Korantzopoulos P, Protonotarios N, Prappa E, Kounas SP, Evagelidou EN, Xydonas S, Kalusche D, Sideris A, Arentz T.
Heart Rhythm. 2011 Jun;8(6):874-8. doi: 10.1016/j.hrthm.2011.01.043. Epub 2011 Apr 11.
PMID: 21315837

A case of severe asymptomatic aortic coarctation in an adult female.
Tsikrikas S, Charalampous C, Letsas KP.
Case Rep Cardiol. 2011;2011:535463. doi: 10.1155/2011/535463. Epub 2011 Jul 10.
PMID: 24826221 Free PMC Article

Atypical Brugada ECG phenotype involving ST-segment elevation in lateral leads.
Letsas KP, Weber R, Tsikrikas S, Charalampous C, Arentz T.
Hellenic J Cardiol. 2010 Nov-Dec;51(6):563-4. No abstract available.
PMID: 21169193 Free Article

Low back pain following intravenous administration of amiodarone.
Tsikrikas S, Charalampous C, Letsas KP, Efremidis M, Sideris A.
Hellenic J Cardiol. 2010 Nov-Dec;51(6):544-5.
PMID: 21169188 Free Article

Exercise-induced repolarization changes in patients with stable coronary artery disease.
Korantzopoulos P, Letsas KP, Christogiannis Z, Kalantzi K, Massis I, Milionis HJ, Pappas C, Goudevenos JA.
Am J Cardiol. 2011 Jan;107(1):37-40. doi: 10.1016/j.amjcard.2010.08.038.
PMID: 21146683

The influence of diabetes on novel electrocardiographic indexes of arrhythmic risk in patients with stable coronary artery disease.
Korantzopoulos P, Letsas KP, Christogiannis Z, Kalantzi K, Milionis HJ, Massis I, Pappas C, Goudevenos JA.
Int J Cardiol. 2011 Jan 21;146(2):267-8. doi: 10.1016/j.ijcard.2010.10.075. Epub 2010 Nov 20. No abstract available.
PMID: 21094537

Proarrhythmia in the setting of acute ST-segment elevation.
Weber R, Letsas KP, Bürkle G, Arentz T, Kalusche D.
J Electrocardiol. 2010 Sep-Oct;43(5):464-5. doi: 10.1016/j.jelectrocard.2010.05.002. Epub 2010 Jul 17. No abstract available.
PMID: 20638667

Uric acid elevation in atrial fibrillation.
Letsas KP, Korantzopoulos P, Filippatos GS, Mihas CC, Markou V, Gavrielatos G, Efremidis M, Sideris A, Kardaras F.
Hellenic J Cardiol. 2010 May-Jun;51(3):209-13.
PMID: 20515852 Free Article

Electrocardiographic differentiation of common type atrioventricular nodal reentrant tachycardia from atrioventricular reciprocating tachycardia via a concealed accessory pathway.
Letsas KP, Weber R, Siklody CH, Mihas CC, Stockinger J, Blum T, Kalusche D, Arentz T.
Acta Cardiol. 2010 Apr;65(2):171-6.
PMID: 20458824

Narrow QRS complex tachycardia inducing Wide QRS complex tachycardia: what is the mechanism?
Letsas KP, Efremidis M, Manolatos D, Sideris A.
Pacing Clin Electrophysiol. 2010 May;33(5):615-7. doi: 10.1111/j.1540-8159.2010.02687.x. Epub 2010 Feb 1. No abstract available.
PMID: 20132508

Pulmonary vein parasystolic activity following circumferential isolation in a patient with paroxysmal atrial fibrillation.
Letsas KP, Efremidis M, Sideris A.
Hellenic J Cardiol. 2010 Jan-Feb;51(1):62-3. No abstract available.
PMID: 20118046 Free Article

QRS complex abnormalities in subjects with idiopathic ventricular fibrillation.
Letsas KP, Weber R, Kalusche D, Arentz T.
Int J Cardiol. 2010 Nov 19;145(2):342-5. doi: 10.1016/j.ijcard.2009.12.008. Epub 2010 Jan 6.
PMID: 20051302

Tpeak-Tend interval and Tpeak-Tend/QT ratio as markers of ventricular tachycardia inducibility in subjects with Brugada ECG phenotype.
Letsas KP, Weber R, Astheimer K, Kalusche D, Arentz T.
Europace. 2010 Feb;12(2):271-4. doi: 10.1093/europace/eup357. Epub 2009 Nov 6.
PMID: 19897501 Free Article

Recurrent syncope associated with a distinct ECG pattern consisting of short QT interval, early repolarization and atrioventricular block.
Efremidis M, Letsas KP, Weber R, Gavrielatos G, Filippatos GS, Sideris A, Kardaras F.
Clin Res Cardiol. 2009 Dec;98(12):807-10. doi: 10.1007/s00392-009-0083-4. Epub 2009 Sep 23. No abstract available.
PMID: 19774329

Wide QRS complex supraventricular tachycardia with negative precordial concordance.
Pappas LK, Efremidis M, Letsas KP, Gavrielatos GD, Alexanian IP, Sideris A, Kardaras F.
Am Heart Hosp J. 2009 Summer;7(1):67-8.
PMID: 19742439

Cardiac amyloidosis and Brugada-like ECG pattern.
Bramos D, Koutras K, Kollias G, Prappa E, Letsas KP, Sideris A.
Int J Cardiol. 2010 Nov 19;145(2):249-51. doi: 10.1016/j.ijcard.2009.08.045. Epub 2009 Sep 9.
PMID: 19740556

Potential-guided versus anatomic-guided approach for slow pathway ablation of the common type atrioventricular nodal reentry tachycardia: a randomized study.
Efremidis M, Sideris A, Letsas KP, Alexanian IP, Pappas LK, Mihas CC, Manolatos D, Xydonas S, Gavrielatos G, Filippatos GS, Kardaras F.
Acta Cardiol. 2009 Aug;64(4):477-83.
PMID: 19725440

Brugada-type ECG pattern in patients treated with oral flecainide for lone atrial fibrillation: is there any clinical implication?
Letsas KP, Weber R, Arentz T, Kalusche D.
Hellenic J Cardiol. 2009 Jul-Aug;50(4):338-9. No abstract available.
PMID: 19622506 Free Article

Pacemaker dependency after implantation of electrophysiological devices.
Korantzopoulos P, Letsas KP, Grekas G, Goudevenos JA.
Europace. 2009 Sep;11(9):1151-5. doi: 10.1093/europace/eup195. Epub 2009 Jul 16. Review.
PMID: 19617204 Free Article

Excessive vagal response during left atrial ablation in a patient with paroxysmal atrial fibrillation.
Efremidis M, Letsas KP, Pappas L, Filippatos G, Sideris A, Kardaras F.
Hellenic J Cardiol. 2009 May-Jun;50(3):227-9.
PMID: 19465367 Free Article

Adenosine sensitive focal atrial tachycardia originating from the non-coronary aortic cusp.
Weber R, Letsas KP, Arentz T, Kalusche D.
Europace. 2009 Jun;11(6):823-6. doi: 10.1093/europace/eup086. Epub 2009 Apr 21.
PMID: 19383671 Free Article

Predictors of atrial fibrillation recurrence in patients with long-lasting atrial fibrillation.
Efremidis M, Alexanian IP, Oikonomou D, Manolatos D, Letsas KP, Pappas LK, Gavrielatos G, Vadiaka M, Mihas CC, Filippatos GS, Sideris A, Kardaras F.
Can J Cardiol. 2009 Apr;25(4):e119-24.
PMID: 19340356 Free PMC Article

Predictors of atrial tachyarrhythmias in subjects with type 1 ECG pattern of Brugada syndrome.
Letsas KP, Weber R, Astheimer K, Mihas CC, Stockinger J, Blum T, Kalusche D, Arentz T.
Pacing Clin Electrophysiol. 2009 Apr;32(4):500-5. doi: 10.1111/j.1540-8159.2009.02311.x.
PMID: 19335860

Sensitivity and specificity of sodium channel blocking test in the diagnosis of Brugada syndrome.
Gavrielatos G, Letsas KP, Pappas LK, Efremidis M, Sideris A, Kardaras F.
Int J Cardiol. 2010 May 28;141(2):e31-3. doi: 10.1016/j.ijcard.2008.11.147. Epub 2009 Jan 13.
PMID: 19141363

Prevalence of early repolarization pattern in inferolateral leads in patients with Brugada syndrome.
Letsas KP, Sacher F, Probst V, Weber R, Knecht S, Kalusche D, Haïssaguerre M, Arentz T.
Heart Rhythm. 2008 Dec;5(12):1685-9. doi: 10.1016/j.hrthm.2008.09.021. Epub 2008 Sep 23.
PMID: 19084806

Clinical characteristics of patients with drug-induced QT interval prolongation and torsade de pointes: identification of risk factors.
Letsas KP, Efremidis M, Kounas SP, Pappas LK, Gavrielatos G, Alexanian IP, Dimopoulos NP, Filippatos GS, Sideris A, Kardaras F.
Clin Res Cardiol. 2009 Apr;98(4):208-12. doi: 10.1007/s00392-008-0741-y. Epub 2008 Nov 24.
PMID: 19031039

Histological recognition and classification of the atrioventricular node artery variants: a new approach.
Nerantzis CE, Gavrielatos G, Kalogrias N, Pappas LK, Letsas KP, Karakoukis NG, Koutsaftis PN.
Cardiovasc Pathol. 2009 Nov-Dec;18(6):346-51. doi: 10.1016/j.carpath.2008.09.006. Epub 2008 Nov 20.
PMID: 19026574

Pre-ablative predictors of atrial fibrillation recurrence following pulmonary vein isolation: the potential role of inflammation.
Letsas KP, Weber R, Bürkle G, Mihas CC, Minners J, Kalusche D, Arentz T.
Europace. 2009 Feb;11(2):158-63. doi: 10.1093/europace/eun309. Epub 2008 Nov 13.
PMID: 19010799 Free Article

Determinants of plasma NT-pro-BNP levels in patients with atrial fibrillation and preserved left ventricular ejection fraction.
Letsas KP, Filippatos GS, Pappas LK, Mihas CC, Markou V, Alexanian IP, Efremidis M, Sideris A, Maisel AS, Kardaras F.
Clin Res Cardiol. 2009 Feb;98(2):101-6. doi: 10.1007/s00392-008-0728-8. Epub 2008 Oct 30.
PMID: 18975023

ECG findings of acute myocardial infarction and atrioventricular block during a transseptal procedure for left atrial ablation.
Efremidis M, Letsas KP, Xydonas S, Koutras K, Sideris A, Kardaras F.
Hellenic J Cardiol. 2008 Jul-Aug;49(4):284-7.
PMID: 18935717 Free Article

Catheter ablation of recipient-to-donor atrioatrial conduction with Wenckebach-like phenomenon after orthotopic heart transplantation.
Letsas KP, Weber R, Arentz T, Kalusche D.
J Heart Lung Transplant. 2008 Aug;27(8):917-20. doi: 10.1016/j.healun.2008.05.010. Epub 2008 Jun 24.
PMID: 18656808

Neurally mediated susceptibility in individuals with Brugada-type ECG pattern.
Letsas KP, Efremidis M, Gavrielatos G, Filippatos GS, Sideris A, Kardaras F.
Pacing Clin Electrophysiol. 2008 Apr;31(4):418-21. doi: 10.1111/j.1540-8159.2008.01010.x.
PMID: 18373759

Neurocardiogenic injury in subarachnoid hemorrhage.
Letsas KP, Gavrielatos G, Sideris A.
J Emerg Med. 2008 Oct;35(3):315-6. doi: 10.1016/j.jemermed.2007.10.023. Epub 2008 Mar 19. No abstract available.
PMID: 18353599

Ablation of atrial fibrillation in patients with heart failure: reversal of atrial and ventricular remodelling.
Efremidis M, Sideris A, Xydonas S, Letsas KP, Alexanian IP, Manolatos D, Mihas CC, Filippatos GS, Kardaras F.
Hellenic J Cardiol. 2008 Jan-Feb;49(1):19-25.
PMID: 18350778 Free Article

Reversal of premature ventricular complex-induced cardiomyopathy following successful radiofrequency catheter ablation.
Efremidis M, Letsas KP, Sideris A, Kardaras F.
Europace. 2008 Jun;10(6):769-70. doi: 10.1093/europace/eun060. Epub 2008 Mar 12.
PMID: 18339610 Free Article

Large left atrial myxoma presented as fever of unknown origin: a challenging diagnosis and a review of the literature.
Gavrielatos G, Letsas KP, Pappas LK, Dedeilias P, Sioras E, Kardaras F.
Cardiovasc Pathol. 2007 Nov-Dec;16(6):365-7. Epub 2007 Feb 22. Review.
PMID: 18005878

The natural history of arrhythmogenic right ventricular cardiomyopathy.
Letsas KP, Gavrielatos G, Efremidis M, Sideris A, Kardaras F.
Am Heart Hosp J. 2007 Fall;5(4):259-62.
PMID: 17982306

Drug-induced long QT syndrome.
Letsas KP, Efremidis M, Filippatos GS, Sideris AM.
Hellenic J Cardiol. 2007 Sep-Oct;48(5):296-9. Review. No abstract available.
PMID: 17966685 Free Article

Prevalence of Brugada sign in a Greek tertiary hospital population.
Letsas KP, Gavrielatos G, Efremidis M, Kounas SP, Filippatos GS, Sideris A, Kardaras F.
Europace. 2007 Nov;9(11):1077-80. Epub 2007 Oct 11.
PMID: 17932024 Free Article

Post-mortem angiographic and histologic findings of coronary artery fibromuscular dysplasia.
Nerantzis CE, Kalogrias NF, Letsas KP, Gavrielatos G, Salachas AJ, Antonellis I, Koutsaftis PN.
Int J Cardiol. 2007 Nov 30;122(3):e32-5. Epub 2007 Oct 1.
PMID: 17905452

Prevalence of paroxysmal atrial fibrillation in Brugada syndrome: a case series and a review of the literature.
Letsas KP, Sideris A, Efremidis M, Pappas LK, Gavrielatos G, Filippatos GS, Kardaras F.
J Cardiovasc Med (Hagerstown). 2007 Oct;8(10):803-6. Review.
PMID: 17885518

Sotalol unmasks susceptibility to drug-induced long QT syndrome and torsades de pointes.
Letsas KP, Efremidis M, Sideris A.
Int J Cardiol. 2008 Mar 14;124(3):366-7; author reply 368-9. Epub 2007 Apr 2. No abstract available.
PMID: 17400314

QT interval prolongation and torsade de pointes associated with indapamide. Comments to Letsas et al.
Perciaccante A, Fiorentini A.
Int J Cardiol. 2007 Nov 30;122(3):255; author reply 256-7. Epub 2007 Mar 21. No abstract available.
PMID: 17368589

Brugada electrocardiographic pattern induced during febrile state with marked leukocytosis.
Gavrielatos G, Letsas KP, Pappas LK, Efremidis M, Sideris A, Kardaras F.
Pacing Clin Electrophysiol. 2007 Jan;30(1):135-6.
PMID: 17241329

Acute myocardial infarction with normal coronary arteries in a patient with Hodgkin's disease: a late complication of irradiation and chemotherapy.
Letsas KP, Korantzopoulos P, Evangelou D, Pappas LK, Kardaras F.
Tex Heart Inst J. 2006;33(4):512-4.
PMID: 17215984 Free PMC Article

Fine-needle aspiration biopsy-RT-PCR expression analysis of prothymosin alpha and parathymosin in thyroid: novel proliferation markers?
Letsas KP, Vartholomatos G, Tsepi C, Tsatsoulis A, Frangou-Lazaridis M.
Neoplasma. 2007;54(1):57-62.
PMID: 17203893

Pathophysiology and management of syncope in Kearns-Sayre syndrome.
Letsas KP, Efremidis M, Pappas LK, Gavrielatos G, Sideris A, Charitos C.
Am Heart Hosp J. 2006 Fall;4(4):301-2.
PMID: 17086014

ST-segment elevation induced during the transseptal procedure for radiofrequency catheter ablation of atrial fibrillation.
Letsas KP, Pappas LK, Gavrielatos G, Efremidis M, Sideris A, Kardaras F.
Int J Cardiol. 2007 Jan 2;114(1):e12-4. Epub 2006 Oct 17.
PMID: 17049645

Secondary prevention of sudden cardiac death in coronary artery spasm: is implantable cardioverter defibrillator always efficient?
Letsas KP, Filippatos GS, Efremidis M, Sideris A, Kardaras F.
Int J Cardiol. 2007 Apr 12;117(1):141-3. Epub 2006 Oct 12.
PMID: 17046086

Anomalous origin of the entire coronary system with separate ostia within the right sinus of valsalva: a rare congenital anomaly and a review of the literature.
Gavrielatos G, Letsas KP, Pappas LK, Antonellis I, Kardaras F.
Cardiology. 2007;107(3):209-12. Epub 2006 Aug 23. Review.
PMID: 16946599

Swimming-triggered aborted sudden cardiac death in a patient with Andersen-Tawil syndrome.
Efremidis M, Pappas LK, Sideris A, Letsas KP, Gavrielatos GD, Kardaras F.
Int J Cardiol. 2006 Sep 20;112(2):e45-7. Epub 2006 Jul 21.
PMID: 16859779

Giant left atrium secondary to rheumatic mitral valve disease.
Letsas KP, Sideris A, Kounas SP, Pappas LK, Kardaras F.
Am J Geriatr Cardiol. 2006 Jul-Aug;15(4):253-4. No abstract available.
PMID: 16849894

Open ended circulation pattern: a rare case of a protective coronary artery variation and review of the literature.
Gavrielatos G, Letsas KP, Pappas LK, Markou V, Antonellis J, Tavernarakis A, Kardaras F.
Int J Cardiol. 2006 Oct 10;112(3):e63-5. Epub 2006 Jul 17.
PMID: 16844248

Enterovirus-induced fulminant myocarditis and hemophagocytic syndrome.
Letsas KP, Filippatos GS, Delimpasi S, Spanakis N, Kounas SP, Efremidis M, Tsakris A, Kardaras F.
J Infect. 2007 Feb;54(2):e75-7. Epub 2006 Jun 2.
PMID: 16733067

Fine needle aspiration biopsy-RT-PCR molecular analysis of thyroid nodules: a useful preoperative diagnostic tool.
Letsas KP, Andrikoula M, Tsatsoulis A.
Minerva Endocrinol. 2006 Jun;31(2):179-82. Review.
PMID: 16682941

Surfing on prothymosin alpha proliferation and anti-apoptotic properties.
Letsas KP, Frangou-Lazaridis M.
Neoplasma. 2006;53(2):92-6. Review.
PMID: 16575463

QT interval prolongation associated with venlafaxine administration.
Letsas K, Korantzopoulos P, Pappas L, Evangelou D, Efremidis M, Kardaras F.
Int J Cardiol. 2006 Apr 28;109(1):116-7.
PMID: 16574528

Early repolarization syndrome: is it always benign?
Letsas KP, Efremidis M, Pappas LK, Gavrielatos G, Markou V, Sideris A, Kardaras F.
Int J Cardiol. 2007 Jan 18;114(3):390-2. Epub 2006 Mar 30.
PMID: 16574260

Letter from Konstantinos P. Letsas et al. - invited editorial comment.
Somberg J, Molnar J.
Cardiology. 2006;105(3):148. Epub 2006 Jan 10. No abstract available.
PMID: 16449813

QT interval prolongation and Torsades de Pointes in a patient receiving zolpidem and amiodarone.
Letsas KP, Filippatos GS, Kounas SP, Efremidis M, Sideris A, Kardaras F.
Cardiology. 2006;105(3):146-7. Epub 2006 Jan 4. No abstract available.
PMID: 16449812

Giant left-ventricular pseudoaneurysm following silent myocardial infarction.
Evangelou D, Letsas KP, Gavrielatos G, Alexanian IP, Pappas LK, Sioras E, Kardaras F.
Cardiology. 2006;105(3):137-8. Epub 2006 Jan 20. No abstract available.
PMID: 16428885

Primary antiphospholipid syndrome and factor V Leiden mutation in a young patient with non-bacterial thrombotic endocarditis and transient ischemic stroke.
Letsas KP, Filippatos GS, Kounas SP, Pappas LK, Gavrielatos G, Kardaras F.
Thromb Haemost. 2005 Dec;94(6):1331-2. No abstract available.
PMID: 16411415

Hypertrophic cardiomyopathy in a patient with Crohn's disease: a case report.
Letsas KP, Kounas SP, Evangelou D, Pappas LK, Efremidis M, Sideris A, Kardaras F.
Int J Cardiol. 2007 Jan 2;114(1):108-10. Epub 2005 Dec 20.
PMID: 16364468

Transcription factor-mediated proliferation and apoptosis in benign and malignant thyroid lesions.
Letsas KP, Frangou-Lazaridis M, Skyrlas A, Tsatsoulis A, Malamou-Mitsi V.
Pathol Int. 2005 Nov;55(11):694-702.
PMID: 16271081

QT interval prolongation and torsade de pointes associated with indapamide.
Letsas KP, Alexanian IP, Pappas LK, Kounas SP, Efremidis M, Sideris A, Kardaras F.
Int J Cardiol. 2006 Oct 10;112(3):373-4. Epub 2005 Nov 2.
PMID: 16260053

Spontaneous coronary artery dissection associated with oral contraceptive use: a case report and review of the literature.
Evangelou D, Letsas KP, Korantzopoulos P, Antonellis I, Sioras E, Kardaras F.
Int J Cardiol. 2006 Oct 10;112(3):380-2. Epub 2005 Oct 26. Review.
PMID: 16256224

Right atrial thrombosis mimicking myxoma in a patient with primary antiphospholipid syndrome.
Letsas K, Kounas S, Pappas L, Efremidis M, Kardaras F.
Minerva Cardioangiol. 2005 Aug;53(4):337-8. No abstract available.
PMID: 16177680

Exercise-induced second-degree atrioventricular block.
Pappas LK, Efremidis M, Sideris A, Letsas KP, Kounas SP, Kardaras F.
Int J Cardiol. 2006 Aug 28;111(3):461-3. Epub 2005 Aug 3.
PMID: 16083979

Drug-induced QT interval prolongation after ciprofloxacin administration in a patient receiving olanzapine.
Letsas KP, Sideris A, Kounas SP, Efremidis M, Korantzopoulos P, Kardaras F.
Int J Cardiol. 2006 May 10;109(2):273-4. Epub 2005 Jun 1.
PMID: 15935493

QT interval prolongation and torsades de pointes due to a coadministration of metronidazole and amiodarone.
Kounas SP, Letsas KP, Sideris A, Efraimidis M, Kardaras F.
Pacing Clin Electrophysiol. 2005 May;28(5):472-3.
PMID: 15869686

Thoracic actinomycosis as a cause of superior vena cava syndrome: report of a case.
Kotoulas C, Foroulis C, Letsas K, Papamichalis G, Lioulias A.
Surg Today. 2004;34(5):447-9.
PMID: 15108086

Bilious pericardial effusion at initial presentation in a patient with lung cancer.
Kotoulas CS, Foroulis C, Letsas K, Kostikas K, Konstantinou M.
World J Surg Oncol. 2003 Nov 8;1(1):24.
PMID: 14613553 Free PMC Article

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