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Parikh R, Bohora S, Rane S, Bansal R, Patel K. Analysis of ST segment depression in supraventricular tachycardia and its relationship with underlying mechanism. Indian Pacing Electrophysiol J 2024:S0972-6292(24)00076-7. [PMID: 38960131 DOI: 10.1016/j.ipej.2024.06.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2023] [Revised: 06/07/2024] [Accepted: 06/14/2024] [Indexed: 07/05/2024] Open
Abstract
BACKGROUND Electrocardiographic diagnosis of causes of supraventricular tachycardia (SVT) is sometimes difficult and application of routine algorithms can lead to misdiagnosis in as many as 37 % of patients. ST segment depression may be useful in diagnosing the nature of SVT. METHODS We reviewed surface electrocardiogram (ECG) characteristics of 300 patients having SVT with 1:1 AV relationship and correlated findings with electrophysiology study (EPS) findings. Final diagnosis of AVNRT (Atrioventricular nodal reentrant tachycardia), Orthodromic AVRT (atrioventricular reentrant tachycardia) and atrial tachycardia (AT) was correlated with ECG parameters like heart rate, ST segment depressions and QRS morphology. RESULTS Out of 300 patients, majority patients included in study, were having AVNRT or AVRT. ST depression predicted AVRT if the ST depression was ≥ 2 mm (overall sensitivity of 38.3 % and specificity of 93.8 % to predict AVRT) and was downsloping in morphology (sensitivity of 36.9 % and specificity of 94.7 % to predict AVRT). At heart rates ≥214 beats per minute (bpm) as measured by 7 small squares of ECG at 25 mm/s, downsloping ST depression ≥2 mm had a sensitivity 37.9 % of and specificity of 89.2 % to predict AVRT. At heart rate <214 bpm, downsloping ST depression ≥2 mm had sensitivity of 37.2 % and specificity of 96.5 % to predict AVRT. Downsloping ST depression of ≥2 mm helps to differentiate AVNRT from AVRT. CONCLUSION A downsloping ST segment depression ≥2 mm predicted SVT being an AVRT and can be used as a useful criteria in diagnosing the tachycardia.
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Affiliation(s)
- Rujuta Parikh
- Department of cardiology U.N.Mehta Institute of Cardiology and Research Centre (UNMICRC), Civil Hospital Campus, Asarwa, Ahmedabad, 380016, Gujarat, India.
| | - Shomu Bohora
- Department of cardiology U.N.Mehta Institute of Cardiology and Research Centre (UNMICRC), Civil Hospital Campus, Asarwa, Ahmedabad, 380016, Gujarat, India.
| | - Sameer Rane
- Department of cardiology U.N.Mehta Institute of Cardiology and Research Centre (UNMICRC), Civil Hospital Campus, Asarwa, Ahmedabad, 380016, Gujarat, India.
| | - Raghav Bansal
- Department of cardiology U.N.Mehta Institute of Cardiology and Research Centre (UNMICRC), Civil Hospital Campus, Asarwa, Ahmedabad, 380016, Gujarat, India.
| | - Krutika Patel
- Department of Research, U. N. Mehta Institute of Cardiology and Research Centre (UNMICRC), Civil Hospital Campus, Asarwa, Ahmedabad, 380016, Gujarat, India.
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Cao Y, Wu Z, Liu Z, Liu Q, Zhou S. Investigation of clinical significance of ST-segment depression during paroxysmal supraventricular tachycardia. J Electrocardiol 2024; 84:52-57. [PMID: 38518582 DOI: 10.1016/j.jelectrocard.2024.02.009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2024] [Revised: 02/19/2024] [Accepted: 02/27/2024] [Indexed: 03/24/2024]
Abstract
INTRODUCTION There are great differences in ST-segment depression during PSVT episodes. The aim of this study is to investigate the clinical significance of ST segment depression during PSVT. METHODS The study enrolled 333 consecutive patients who were diagnosed with PSVT by electrophysiological test from Jan 1, 2021 to July 31, 2022. The range, magnitude and morphology of ST-segment depression were described. The correlation between ST-segment depression and symptoms of chest tightness, chest pain or hypotension, the correlation between ST-segment depression and coronary stenosis, and the possible influencing factors were analyzed. In addition, the diagnostic efficacy of ST-segment depression for AVRT was determined. RESULTS ST-segment depression was present in 85% of patients, in 70% of which the depression range was more than six leads. The magnitude of the depression was more significant in precordial leads (P < 0.001). ST-segment depression of >1 mm in limb leads and precordial leads was found in 36.0% and 49.8% of the patients, respectively, while >3 mm was found in 2.4% and 9.6%, respectively. The morphology of ST-segment depression in limb leads was different from that in precordial leads (P < 0.001). Downsloping ST-segment depression was more common in limb leads (limb vs. precordial: 40.5% vs. 12.6%), whereas upsloping depression was more common in precordial leads (limb vs. precordial: 3.0% vs. 23.1%). Correlation analysis showed that ST-segment depression was not correlated with symptoms of chest tightness and pain, nor was it correlated with coronary artery stenosis. The most important influencing factor is the type of PSVT, especially affecting the morphology of depression in limb leads (OR = 10.27 [5.93-17.79], P < 0.001). The sensitivity and specificity of downsloping ST-segment depression in limb leads for diagnosis of AVRT were 75.5% and 76.7%. CONCLUSION ST-segment depression is a common ECG change during PSVT episodes, and it's not associated with severe coronary stenosis. The type of PSVT has a significant effect on the manifestation of ST-segment depression. The downslope morphology of ST-segment depression in limb leads is helpful in differentiating AVRT from AVNRT.
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Affiliation(s)
- Yuanyuan Cao
- Department of Cardiology, The Second Xiangya Hospital, Central South University, Changsha, Hunan 410011, China
| | - Zhihong Wu
- Department of Cardiology, The Second Xiangya Hospital, Central South University, Changsha, Hunan 410011, China
| | - Zhenjiang Liu
- Department of Cardiology, The Second Xiangya Hospital, Central South University, Changsha, Hunan 410011, China
| | - Qiming Liu
- Department of Cardiology, The Second Xiangya Hospital, Central South University, Changsha, Hunan 410011, China.
| | - Shenghua Zhou
- Department of Cardiology, The Second Xiangya Hospital, Central South University, Changsha, Hunan 410011, China
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Perelshtein Brezinov O, Vorotilina N, Vasilenko L, Kogan Y, Lev EI, Laish-Farkash A. Coronary artery disease among patients admitted with atrial fibrillation and chest pain. Coron Artery Dis 2023; 34:96-101. [PMID: 36515228 DOI: 10.1097/mca.0000000000001206] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
INTRODUCTION Patients who present to the emergency department with chest pain during an episode of atrial fibrillation (AF) impose a clinical challenge regarding the source of pain - being coronary artery disease (CAD) or AF in origin. The aim of this study was to identify clinical, imaging or laboratory markers which can predict significant CAD among patients with an AF episode and chest pain. METHODS We included 57 consecutive patients admitted to our hospital with AF and chest pain. All patients underwent coronary evaluation. Significant CAD was defined as >50% stenosis in a major coronary artery by coronary angiography or cardiac CT. We compared CAD and non-CAD groups and analyzed risk factorsby regression analysis. RESULTS Twenty-four patients (42%) were diagnosed with- and 33 patients (58%) without obstructive CAD. In a multivariate analysis of regional wall motion abnormality (RWMA), elevated troponin and hypertension were found to be predictors for CAD [odds ratio (OR), 22.4 (confidence interval (CI), 1.8-272.4; P = 0.02); OR, 5.6 (CI, 1-31.0; P = 0.05) and OR, 21.4 (CI, 1.6-284.6; P = 0.02), respectively]. There were no significant differences regarding the rate of typical chest pain at presentation in the CAD vs. the non-CAD group [13 (54%) vs. 20 (60%), P = 0.374], or in ECG ST-changes [12 (50%) vs.9 (27%), respectively; P = 0.08]. CONCLUSION In patients who present acutely with chest pain and AF, troponin elevation and RWMA appear to be highly predictive of obstructive CAD, whereas clinical symptoms and ECG changes are not predictive. These findings may be helpful for guiding the management of patients admitted with AF and chest pain.
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Affiliation(s)
- Olga Perelshtein Brezinov
- Cardiology Department, Samson Assuta Ashdod University Medical Center, Ashdod, and Ben Gurion University of the Negev, Israel
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Mercik J, Radziejewska J, Pach K, Zawadzki G, Zyśko D, Gajek J. ST-segment depression in atrioventricular nodal reentrant tachycardia: Important finding or just an artifact? Medicine (Baltimore) 2022; 101:e31806. [PMID: 36626431 PMCID: PMC9750532 DOI: 10.1097/md.0000000000031806] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
Abstract
BACKGROUND The ST segment is component of the QRS-T complex located between the QRS and the T wave. ST segment changes during tachycardia with narrow QRS mainly takes the form of ST segment depression. This phenomenon is often observed in young healthy people for whom an ischemic background is unlikely. MATERIALS AND METHODS The study included 104 patients (71 women and 33 men) with paroxysmal narrow QRS complex tachycardia. In all patients electrophysiological study was performed and the diagnosis of atrioventricular nodal reentrant tachycardia was established. The arrhythmogenic substrate was then eliminated successfully by subsequent ablation using radiofrequency energy which confirmed the diagnosis, all patients had measured QRS components - QR, RS and RJ during the tachycardia and during the sinusrhythm. All of the measurements were done in lead V5. RESULTS The difference RJ-QR during tachycardia and sinus rhythm correlated negatively with tachycardia cycle length (R = 0.356, P = .001), first slowly, then rapidly reaching the cycle value of about 300 ms, then it decreases, stabilizing at the cycle level of about 270. By separating the RJ-QR in tachycardia and in the sinus rhythm from the tachycardia cycle, we can see that the correlation described in this point is largely due to the correlation between the heart rate and RJ-QR length in tachycardia. CONCLUSIONS In patients with atrioventricular nodal reentrant tachycardia, there is a significant ST-segment depression during tachycardia episodes and the degree of this change is related to tachycardia cycle length. The most probable explanation of the ST-segment depression is the overlap of the QRS complex on the preceded T wave. This phenomenon is also influenced by some intrinsic properties of the individual electrocardiogram. It is possible to rule out ischemic origin of the presented ST segment change.
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Affiliation(s)
- Jakub Mercik
- Department of Emergency Medicine, Wroclaw Medical University, Poland
| | | | - Katarzyna Pach
- Students’ Scientific Association, Department of Emergency Medical Service, Wroclaw Medical University, Poland
| | - Grzegorz Zawadzki
- Students’ Scientific Association, Department of Emergency Medical Service, Wroclaw Medical University, Poland
| | - Dorota Zyśko
- Department of Emergency Medicine, Wroclaw Medical University, Poland
| | - Jacek Gajek
- Department of Emergency Medical Service, Wroclaw Medical University, Poland
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ST Segment Elevation and Depressions in Supraventricular Tachycardia without Coronary Artery Disease. Case Rep Cardiol 2019; 2018:2716312. [PMID: 30647973 PMCID: PMC6311840 DOI: 10.1155/2018/2716312] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2018] [Accepted: 11/01/2018] [Indexed: 11/17/2022] Open
Abstract
ST segment changes are well documented in literature during supraventricular tachycardias. We present a case of a 21-year-old male who presents with chest pain, shortness of breath, and dizziness with an ECG showing atrioventricular reentrant tachycardia and diffuse ST segment depressions. Patient spontaneously converted to sinus rhythm, but he was still complaining of crushing chest pain. ECG taken after conversion showed sinus rhythm at a rate of 65 and showed obvious persistence of ST depressions in majority of leads. Emergent left heart catheterization showed normal coronaries. Such ST depression is suggestive of global ischemia in small intracardiac vessels that cannot be evaluated by left heart catheterization.
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Dorenkamp M, Zabel M, Sticherling C. Role of Coronary Angiography Before Radiofrequency Ablation in Patients Presenting With Paroxysmal Supraventricular Tachycardia. J Cardiovasc Pharmacol Ther 2016; 12:137-44. [PMID: 17562784 DOI: 10.1177/1074248407300775] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
During episodes of paroxysmal supraventricular tachycardia (PSVT), electrocardiograms frequently show ST-segment depressions, and patients may experience typical chest pain prompting invasive coronary angiography. We evaluated 114 patients presenting with PSVT for concomitant coronary artery disease (CAD). Patients were classified as to the type of PSVT, symptoms during PSVT, and cardiovascular risk factors. Maximum heart rate, extent of ST-segment depression, and cardiac troponin levels during PSVT were recorded. Patients were subjected to exercise testing and/or coronary angiography. During PSVT, symptoms suggestive of myocardial ischemia, including chest pain (31%), ST-segment depression (61%), and elevated troponin levels (12%), were common. Sixty-seven patients (59%) underwent coronary angiography. The overall prevalence of significant CAD was found to be low (4%) and did not correlate to symptoms during tachycardia. Routine coronary angiography cannot be recommended in patients with PSVT unless routine evaluation outside episodes of tachycardia suggests the presence of significant CAD.
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Affiliation(s)
- Marc Dorenkamp
- Department of Cardiology and Pneumology, Charité-Universitätsmedizin Berlin, Campus Benjamin Franklin, Berlin, Germany, and the Division of CArdiology, University Hospital, Basel, Switzerland
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Bogossian H, Ninios I, Frommeyer G, Bandorski D, Eckardt L, Lemke B, Zarse M. U wave during supraventricular tachycardia: simulation of a long RP tachycardia and hiding the common type AVNRT. Ann Noninvasive Electrocardiol 2014; 20:292-5. [PMID: 25200520 DOI: 10.1111/anec.12190] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
Abstract
The main tool for the differentiation of supraventricular tachycardia is the 12-lead electrocardiogram (ECG). Especially differentiating the atrioventricular nodal reentrant tachycardia (AVNRT) from the atrioventricular reentrant tachycardia (AVRT) due to concealed accessory pathway or from an atrial tachycardia (AT) is very important for catheter setting and ablation approach in an electrophysiological study. In our case we saw the occurrence of a U wave during tachycardia-simulating a pseudo P wave. This mimicked a long RP-tachycardia, although it was a common type AVNRT.
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Affiliation(s)
- Harilaos Bogossian
- Märkische Kliniken GmbH, Department of Cardiology and Angiology, Klinikum Lüdenscheid, Germany.,Department of Cardiology, University Witten/ Herdecke, Witten, Germany
| | - Ilias Ninios
- Märkische Kliniken GmbH, Department of Cardiology and Angiology, Klinikum Lüdenscheid, Germany
| | - Gerrit Frommeyer
- Division of Electrophysiology, Department of Cardiovascular Medicine, University of Münster, Münster, Germany
| | - Dirk Bandorski
- Märkische Kliniken GmbH, Department of Cardiology and Angiology, Klinikum Lüdenscheid, Germany
| | - Lars Eckardt
- Division of Electrophysiology, Department of Cardiovascular Medicine, University of Münster, Münster, Germany
| | - Bernd Lemke
- Märkische Kliniken GmbH, Department of Cardiology and Angiology, Klinikum Lüdenscheid, Germany
| | - Markus Zarse
- Märkische Kliniken GmbH, Department of Cardiology and Angiology, Klinikum Lüdenscheid, Germany.,Department of Cardiology, University Witten/ Herdecke, Witten, Germany
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Rivera S, De La Paz Ricapito M, Conde D, Verdu MB, Roux JF, Paredes FA. The retrograde P-wave theory: explaining ST segment depression in supraventricular tachycardia by retrograde AV node conduction. PACING AND CLINICAL ELECTROPHYSIOLOGY: PACE 2014; 37:1100-5. [PMID: 24697871 DOI: 10.1111/pace.12394] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/15/2014] [Revised: 01/26/2010] [Accepted: 02/03/2014] [Indexed: 11/26/2022]
Abstract
BACKGROUND Pseudo ischemic ST segment changes during supraventricular tachycardia (SVT) are not yet fully understood. Our aim was to determine whether venticulo-atrial (VA) conduction during SVT may be a possible mechanism for ST depression (STd) in SVT. METHODS Patients undergoing SVT ablation (2010-2012) were analyzed (n = 72).Typical atrioventricular node reentrant tachycardia (AVNRT) and atrioventricular reentrant tachycardia (AVRT) were included. Those with STd were compared to those without STd. VA interval length, tachycardia cycle length (TCL), and retrograde P-wave activation during SVT were assessed. Retrograde P waves arriving simultaneously with the ST segment (PWST) during SVT were considered, whenever an atrial electrogram (measured from the high right atrium) was "on time" with the ST segment. RESULTS Patients with STd during SVT presented longer VA intervals than those without STd (VA 100 ± 37 ms vs VA 69 ± 22 ms; P = 0.006). No differences in TCL were observed (TCL 333 ± 35 ms vs TCL 360 ± 22 ms; P = 0.1). PWST was observed in 38.5% of patients with AVNRT and STd versus 0% in those without STd. The TCL was similar in both groups (355 ± 25 ms vs 334 ± 18 ms; P = 0.1). In patients with AVRT and STd, PWST was present in 81% of cases versus 0% in those without STd. The TCL was also similar (330 ± 29 ms vs 346 ± 17 ms; P = 0.1). CONCLUSIONS STd during SVT is observed at long VA intervals when the retrograde P wave matches the ST segment, without dependence on the TCL. This suggests that STd is not necessarily rate dependent but a result of a fusion between the ST segment and the P wave.
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Affiliation(s)
- Santiago Rivera
- Division of Cardiology, Centre Hospitalier Universitaire de Sherbrooke, Sherbrooke, Canada
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Conti A, Mariannini Y, Canuti E. Troponin rise and poor outcome in patients with acute atrial fibrillation: rationale and criteria of selection of patients. Am J Emerg Med 2013; 31:1148-50. [DOI: 10.1016/j.ajem.2013.04.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2013] [Accepted: 04/02/2013] [Indexed: 11/26/2022] Open
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Pradhan R, Chaudhary A, Donato AA. Predictive accuracy of ST depression during rapid atrial fibrillation on the presence of obstructive coronary artery disease. Am J Emerg Med 2012; 30:1042-7. [DOI: 10.1016/j.ajem.2011.06.027] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2011] [Revised: 06/26/2011] [Accepted: 06/27/2011] [Indexed: 11/29/2022] Open
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Myocardial ischemia induced by rapid atrial pacing causes troponin T release detectable by a highly sensitive assay: insights from a coronary sinus sampling study. J Am Coll Cardiol 2011; 57:2398-405. [PMID: 21658559 DOI: 10.1016/j.jacc.2010.11.066] [Citation(s) in RCA: 114] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/04/2010] [Revised: 10/19/2010] [Accepted: 11/18/2010] [Indexed: 12/19/2022]
Abstract
OBJECTIVES The purpose of this study was to assess whether: 1) very small increases in troponin T, measured by a new highly sensitive cardiac troponin T (hs-cTnT), may reflect ischemia without necrosis; and 2) serial changes can discriminate ischemia from other causes of cardiac troponin T (cTnT) release. BACKGROUND A new hs-cTnT assay offers greater sensitivity than current assays. METHODS Nineteen patients referred for diagnostic catheterization underwent cannulation of the coronary sinus (CS). Serial CS and peripheral plasma samples were obtained at multiple time points during and after incremental rapid atrial pacing. cTnT was quantified using both a standard and a pre-commercial highly sensitive assay. Ischemia was determined by the presence of significant coronary artery disease (CAD) and myocardial lactate release with pacing. RESULTS cTnT concentrations in CS blood increased from a median of 6.8 pg/ml prior to pacing to 15.6 pg/ml 60 min after termination of rapid atrial pacing (p < 0.0001), changes that were mirrored at 180 min in peripheral blood (5.1 to 11.8 pg/ml, p < 0.0001). Although peripheral cTnT concentrations tended to be higher at 180 min following pacing for patients with CAD and lactate elution (n = 7) when compared with those without either marker (n = 5) (25.0 pg/ml vs. 10.2 pg/ml, p = 0.10), relative (1.7-fold vs. 5.2-fold) and absolute (6.8 pg/ml vs. 8.8 pg/ml, p = 0.50) changes were not different between groups. CONCLUSIONS Brief periods of ischemia, without frank infarction, cause low-level cTnT release, and small increases are common after periods of increased myocardial work, even among patients without objective evidence of myocardial ischemia or obstructive CAD. Additional research is needed before hs-cTnT assays are widely adopted in the management of subjects with chest pain syndromes.
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van den Bos EJ, Constantinescu AA, van Domburg RT, Akin S, Jordaens LJ, Kofflard MJM. Minor elevations in troponin I are associated with mortality and adverse cardiac events in patients with atrial fibrillation. Eur Heart J 2011; 32:611-7. [DOI: 10.1093/eurheartj/ehq491] [Citation(s) in RCA: 74] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Bukkapatnam RN, Robinson M, Turnipseed S, Tancredi D, Amsterdam E, Srivatsa UN. Relationship of myocardial ischemia and injury to coronary artery disease in patients with supraventricular tachycardia. Am J Cardiol 2010; 106:374-7. [PMID: 20643248 DOI: 10.1016/j.amjcard.2010.03.035] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/21/2010] [Revised: 03/09/2010] [Accepted: 03/09/2010] [Indexed: 11/16/2022]
Abstract
Increase of serum troponin I and ST-segment depression are objective markers of myocardial ischemia/injury. Abnormalities of the 2 indicators have been associated with supraventricular tachycardia (SVT) but their relevance for diagnosing acute coronary syndrome and the presence of coronary artery disease (CAD) in this setting have not been clarified. Therefore, we sought to evaluate the frequency of CAD based on increased troponin I and ST-segment depression during SVT. During a 5-year period, 104 patients were admitted with a diagnosis of SVT, 80 of whom had troponin I testing, and 70 of these patients could be assessed for ST-segment changes. Thirty-seven patients (48%) had increased troponin I (mean 1.54 +/- 2.7 ng/dl, normal <or=0.07 ng/dl) and 46 patients (57%) had ST-segment depression >or=1.0 mm. There were no significant differences in baseline characteristics and clinical presentation of patients with and without troponin I increase or ST-segment depression. There was no difference in the diagnosis of CAD by noninvasive or invasive testing in patients with and without increased troponin I. More patients with than without ST-segment depression had evidence of CAD (22% vs none, p = 0.01), but after adjusting for covariates, ST-segment depression was not a significant predictor of CAD. In conclusion, increased troponin I and ST-segment depression are not significant markers of acute coronary syndrome in patients with SVT.
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Affiliation(s)
- Radhika Nandur Bukkapatnam
- Division of Cardiovascular Medicine, University of California, Davis Medical Center, Sacramento, California, USA
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14
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Goette A, Bukowska A, Dobrev D, Pfeiffenberger J, Morawietz H, Strugala D, Wiswedel I, Röhl FW, Wolke C, Bergmann S, Bramlage P, Ravens U, Lendeckel U. Acute atrial tachyarrhythmia induces angiotensin II type 1 receptor-mediated oxidative stress and microvascular flow abnormalities in the ventricles. Eur Heart J 2009; 30:1411-20. [PMID: 19269986 PMCID: PMC2688683 DOI: 10.1093/eurheartj/ehp046] [Citation(s) in RCA: 100] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Aims Patients with paroxysmal atrial fibrillation (AF) often present with typical angina pectoris and mildly elevated levels of cardiac troponin (non ST-segment elevation myocardial infarction) during an arrhythmic event. However, in a large proportion of these patients, significant coronary artery disease is excluded by coronary angiography. Here we explored the potential underlying mechanism of these events. Methods and results A total of 14 pigs were studied using a closed chest, rapid atrial pacing (RAP) model. In five pigs RAP was performed for 7 h (600 b.p.m.; n = 5), in five animals RAP was performed in the presence of angiotensin-II type-1-receptor (AT1-receptor) inhibitor irbesartan (RAP+Irb), and four pigs were instrumented without intervention (Sham). One-factor analysis of variance was performed to assess differences between and within the three groups. Simultaneous measurements of fractional flow reserve (FFR) and coronary flow reserve (CFR) before, during, and after RAP demonstrated unchanged FFR (P = 0.327), but decreased CFR during RAP (RAP: 67.7 ± 7.2%, sham: 97.2 ± 2.8%, RAP+Irb: 93.2 ± 3.3; P = 0.0013) indicating abnormal left ventricular (LV) microcirculation. Alterations in microcirculatory blood flow were accompanied by elevated ventricular expression of NADPH oxidase subunit Nox2 (P = 0.039), lectin-like oxidized low-density lipoprotein receptor-1 (LOX-1, P = 0.004), and F2-isoprostane levels (P = 0.008) suggesting RAP-related oxidative stress. Plasma concentrations of cardiac troponin-I (cTn-I) increased in RAP (RAP: 613.3 ± 125.8 pmol/L vs. sham: 82.5 ± 12.5 pmol/L; P = 0.013), whereas protein levels of eNOS and LV function remained unchanged. RAP+Irb prevented the increase of Nox2, LOX-1, and F2-isoprostanes, and abolished the impairment of microvascular blood flow. Conclusion Rapid atrial pacing induces AT1-receptor-mediated oxidative stress in LV myocardium that is accompanied by impaired microvascular blood flow and cTn-I release. These findings provide a plausible mechanism for the frequently observed cTn-I elevation accompanied with typical angina pectoris symptoms in patients with paroxysmal AF and normal (non-stenotic) coronary arteries.
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Affiliation(s)
- Andreas Goette
- Division of Cardiology, University Hospital Magdeburg, Otto-von-Guericke University, Leipzigerstr. 44, 39120 Magdeburg, Germany.
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15
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Robinson MR, Brown RA, Srivatsa U, Amsterdam EA. Over the speed limit. Am J Med 2007; 120:851-3. [PMID: 17904453 DOI: 10.1016/j.amjmed.2007.07.017] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/08/2006] [Revised: 06/14/2007] [Accepted: 07/23/2007] [Indexed: 10/22/2022]
Affiliation(s)
- Melissa R Robinson
- Division of Cardiovascular Medicine, Department of Internal Medicine, University of California, Davis, USA
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Cunningham R, Mikhail MG. Management of patients with syncope and cardiac arrhythmias in an emergency department observation unit. Emerg Med Clin North Am 2001; 19:105-21, vii. [PMID: 11214393 DOI: 10.1016/s0733-8627(05)70170-x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
Syncope is an ideal condition for the emergency observation setting because of its difficulty in diagnosis, many causes, high liability, and variable diagnostic approaches. Hospital admissions can be averted with appropriate patient selection for a short-term observation period. Atrial fibrillation is a common presenting condition in the emergency department. With aggressive management, the appropriately selected patient can have restoration of sinus rhythm and be safely discharged home.
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Affiliation(s)
- R Cunningham
- Department of Emergency Medicine, University of Michigan Hospital, Michigan, USA
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