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Di Marco A, Anguera I, Rodríguez M, Sionis A, Bayes-Genis A, Rodríguez J, Ariza-Solé A, Sánchez-Salado JC, Díaz-Nuila M, Masotti M, Villuendas R, Dallaglio P, Gómez-Hospital JA, Cequier Á. Evaluación de los algoritmos de Smith para el diagnóstico de infarto agudo de miocardio en presencia de bloqueo de rama izquierda del haz de His. Rev Esp Cardiol 2017. [DOI: 10.1016/j.recesp.2016.11.010] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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Di Marco A, Anguera I, Rodríguez M, Sionis A, Bayes-Genis A, Rodríguez J, Ariza-Solé A, Sánchez-Salado JC, Díaz-Nuila M, Masotti M, Villuendas R, Dallaglio P, Gómez-Hospital JA, Cequier Á. Assessment of Smith Algorithms for the Diagnosis of Acute Myocardial Infarction in the Presence of Left Bundle Branch Block. REVISTA ESPANOLA DE CARDIOLOGIA (ENGLISH ED.) 2017; 70:559-566. [PMID: 28027906 DOI: 10.1016/j.rec.2016.11.017] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/28/2016] [Accepted: 11/02/2016] [Indexed: 06/06/2023]
Abstract
INTRODUCTION AND OBJECTIVES Recently, a new electrocardiography algorithm has shown promising results for the the diagnosis of acute myocardial infarction in the presence of left bundle branch block (LBBB). We aimed to assess these new electrocardiography rules in a cohort of patients referred for primary percutaneous coronary intervention (pPCI). METHODS Retrospective observational cohort study that included all patients with suspected myocardial infarction and LBBB on the presenting electrocardiogram, referred for pPCI to 4 tertiary hospitals in Barcelona, Spain. RESULTS A total of 145 patients were included. Fifty four (37%) had an ST-segment elevation myocardial infarction (STEMI) equivalent. Among patients with STEMI, 25 (46%) presented in Killip class III or IV, and in-hospital mortality was 15%. Smith I and II rules performed better than Sgarbossa algorithms and showed good specificity (90% and 97%, respectively) but their sensitivity was 67% and 54%, respectively. In a strategy guided by Smith I or Smith II rules, 18 (33%) or 25 (46%) patients with STEMI would have not received a pPCI, respectively. Moreover, the severity and prognosis of STEMI patients was similar regardless of the positivity of Smith rules. Cardiac biomarkers were positive in 54% of non-STEMI patients, limiting their usefulness for initial diagnostic screening. CONCLUSIONS Diagnosis of STEMI in the presence of LBBB remains a challenge. Smith rules can be useful but are limited by suboptimal sensitivity. The search for new electrocardiography algorithms should be encouraged to avoid unnecessary aggressive treatments in the majority of patients, while providing timely reperfusion to a high-risk subgroup of patients.
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Affiliation(s)
- Andrea Di Marco
- Área del Corazón, Servicio de Cardiología, Hospital Universitario de Bellvitge, Barcelona, Spain.
| | - Ignasi Anguera
- Área del Corazón, Servicio de Cardiología, Hospital Universitario de Bellvitge, Barcelona, Spain
| | - Marcos Rodríguez
- Área del Corazón, Servicio de Cardiología, Hospital Universitario de Bellvitge, Barcelona, Spain
| | | | - Antoni Bayes-Genis
- Servicio de Cardiología, Hospital Universitario Germans Trias i Pujol, Badalona, Barcelona, Spain
| | - Jany Rodríguez
- Servicio de Cardiología, Hospital Clínic, Barcelona, Spain
| | - Albert Ariza-Solé
- Área del Corazón, Servicio de Cardiología, Hospital Universitario de Bellvitge, Barcelona, Spain
| | | | | | - Mónica Masotti
- Servicio de Cardiología, Hospital Clínic, Barcelona, Spain
| | - Roger Villuendas
- Servicio de Cardiología, Hospital Universitario Germans Trias i Pujol, Badalona, Barcelona, Spain
| | - Paolo Dallaglio
- Área del Corazón, Servicio de Cardiología, Hospital Universitario de Bellvitge, Barcelona, Spain
| | | | - Ángel Cequier
- Área del Corazón, Servicio de Cardiología, Hospital Universitario de Bellvitge, Barcelona, Spain
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Pera VK, Larson DM, Sharkey SW, Garberich RF, Solie CJ, Wang YL, Traverse JH, Poulose AK, Henry TD. New or presumed new left bundle branch block in patients with suspected ST-elevation myocardial infarction. EUROPEAN HEART JOURNAL-ACUTE CARDIOVASCULAR CARE 2017; 7:208-217. [PMID: 29064258 DOI: 10.1177/2048872617691508] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
AIMS Using a comprehensive large prospective regional ST-elevation myocardial infarction (STEMI) system database, we evaluated the prevalence, clinical and angiographic characteristics, and outcomes in patients with ischemic symptoms and new or presumed new left bundle branch block (LBBB). We then tested a new hierarchical diagnosis and triage algorithm to identify more accurately new LBBB patients with an acute culprit lesion. METHODS AND RESULTS From March 2003 to June 2013, 3903 consecutive STEMI patients were treated using the Minneapolis Heart Institute regional STEMI protocol including 131 patients (3.3%) with new LBBB. These patients had fewer culprit arteries (54.2% vs. 86.4%; P<0.001), were older, more commonly women, with a lower ejection fraction, and more frequently presented with cardiac arrest or heart failure than those without new LBBB. At 1 year follow-up, all-cause mortality accounting for baseline differences was higher in patients with new LBBB (hazard ratio 1.73, 95% confidence interval 1.17-2.58; P=0.007). The new algorithm yielded high sensitivity (97%) and negative predictive value (94%) for identification of a culprit lesion. Using the definition of new LBBB with either hemodynamically unstable features or Sgarbossa concordance criteria on electrocardiogram (ECG), 45% of new LBBB patients would have been treated as 'STEMI equivalent'. CONCLUSION Patients with acute ischemic symptoms and new LBBB represent a high-risk population with unique clinical challenges. If validated in an independent dataset, the new algorithm may improve the diagnostic accuracy regarding reperfusion therapy for new LBBB patients.
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Affiliation(s)
- Vijaya K Pera
- 1 Division of Cardiology, Minneapolis Heart Institute Foundation at Abbott Northwestern Hospital, USA
| | - David M Larson
- 1 Division of Cardiology, Minneapolis Heart Institute Foundation at Abbott Northwestern Hospital, USA
| | - Scott W Sharkey
- 1 Division of Cardiology, Minneapolis Heart Institute Foundation at Abbott Northwestern Hospital, USA
| | - Ross F Garberich
- 1 Division of Cardiology, Minneapolis Heart Institute Foundation at Abbott Northwestern Hospital, USA
| | - Christopher J Solie
- 1 Division of Cardiology, Minneapolis Heart Institute Foundation at Abbott Northwestern Hospital, USA
| | - Yale L Wang
- 1 Division of Cardiology, Minneapolis Heart Institute Foundation at Abbott Northwestern Hospital, USA
| | - Jay H Traverse
- 1 Division of Cardiology, Minneapolis Heart Institute Foundation at Abbott Northwestern Hospital, USA
| | - Anil K Poulose
- 1 Division of Cardiology, Minneapolis Heart Institute Foundation at Abbott Northwestern Hospital, USA
| | - Timothy D Henry
- 1 Division of Cardiology, Minneapolis Heart Institute Foundation at Abbott Northwestern Hospital, USA.,2 Division of Cardiology, Cedars-Sinai Heart Institute, USA
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von Jeinsen B, Tzikas S, Pioro G, Palapies L, Zeller T, Bickel C, Lackner KJ, Baldus S, Blankenberg S, Muenzel T, Zeiher AM, Keller T. Troponin I Assay for Identification of a Significant Coronary Stenosis in Patients with Suspected Acute Myocardial Infarction and Wide QRS Complex. PLoS One 2016; 11:e0154724. [PMID: 27148734 PMCID: PMC4858235 DOI: 10.1371/journal.pone.0154724] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2016] [Accepted: 04/18/2016] [Indexed: 12/02/2022] Open
Abstract
Background Common ECG criteria such as ST-segment changes are of limited value in patients with suspected acute myocardial infarction (AMI) and bundle branch block or wide QRS complex. A large proportion of these patients do not suffer from an AMI, whereas those with ST-elevation myocardial infarction (STEMI) equivalent AMI benefit from an aggressive treatment. Aim of the present study was to evaluate the diagnostic information of cardiac troponin I (cTnI) in hemodynamically stable patients with wide QRS complex and suspected AMI. Methods In 417 out of 1818 patients presenting consecutively between 01/2007 and 12/2008 in a prospective multicenter observational study with suspected AMI a prolonged QRS duration was observed. Of these, n = 117 showed significant obstructive coronary artery disease (CAD) used as diagnostic outcome variable. cTnI was determined at admission. Results Patients with significant CAD had higher cTnI levels compared to individuals without (median 250ng/L vs. 11ng/L; p<0.01). To identify patients needing a coronary intervention, cTnI yielded an area under the receiver operator characteristics curve of 0.849. Optimized cut-offs with respect to a sensitivity driven rule-out and specificity driven rule-in strategy were established (40ng/L/96ng/L). Application of the specificity optimized cut-off value led to a positive predictive value of 71% compared to 59% if using the 99th percentile cut-off. The sensitivity optimized cut-off value was associated with a negative predictive value of 93% compared to 89% provided by application of the 99th percentile threshold. Conclusion cTnI determined in hemodynamically stable patients with suspected AMI and wide QRS complex using optimized diagnostic thresholds improves rule-in and rule-out with respect to presence of a significant obstructive CAD.
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Affiliation(s)
- Beatrice von Jeinsen
- Division of Cardiology, Department of Internal Medicine III, Goethe University Frankfurt, Frankfurt, Germany
- * E-mail: (TK); (BJ)
| | - Stergios Tzikas
- 3rd Department of Cardiology, Aristotle University of Thessaloniki, Ippokrateio Hospital, Thessaloniki, Greece
- Department of Internal Medicine II, University Medical Center, Johannes Gutenberg University, Mainz, Germany
| | - Gerhard Pioro
- Department of Internal Medicine II, University Medical Center, Johannes Gutenberg University, Mainz, Germany
| | - Lars Palapies
- Division of Cardiology, Department of Internal Medicine III, Goethe University Frankfurt, Frankfurt, Germany
| | - Tanja Zeller
- Department of General and Interventional Cardiology, University Heart Center, Hamburg, Germany
- German Centre for Cardiovascular Research (DZHK), Berlin, Germany
| | - Christoph Bickel
- Department of Internal Medicine, Federal Armed Forces Hospital, Koblenz, Germany
| | - Karl J. Lackner
- Department of Laboratory Medicine, University Medical Center, Johannes Gutenberg University, Mainz, Germany
| | - Stephan Baldus
- Department of Internal Medicine III, University of Cologne, Köln, Germany
| | - Stefan Blankenberg
- Department of General and Interventional Cardiology, University Heart Center, Hamburg, Germany
- German Centre for Cardiovascular Research (DZHK), Berlin, Germany
| | - Thomas Muenzel
- Department of Internal Medicine II, University Medical Center, Johannes Gutenberg University, Mainz, Germany
- German Centre for Cardiovascular Research (DZHK), Berlin, Germany
| | - Andreas M. Zeiher
- Division of Cardiology, Department of Internal Medicine III, Goethe University Frankfurt, Frankfurt, Germany
- German Centre for Cardiovascular Research (DZHK), Berlin, Germany
| | - Till Keller
- Division of Cardiology, Department of Internal Medicine III, Goethe University Frankfurt, Frankfurt, Germany
- German Centre for Cardiovascular Research (DZHK), Berlin, Germany
- * E-mail: (TK); (BJ)
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Kumar V, Venkataraman R, Aljaroudi W, Osorio J, Heo J, Iskandrian AE, Hage FG. Implications of left bundle branch block in patient treatment. Am J Cardiol 2013; 111:291-300. [PMID: 23111137 DOI: 10.1016/j.amjcard.2012.09.029] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/14/2012] [Revised: 09/01/2012] [Accepted: 09/01/2012] [Indexed: 11/27/2022]
Abstract
Left bundle branch block (LBBB) causes an abnormal pattern of cardiac activation and affects regional myocardial function. Although recognition of LBBB on the surface electrocardiogram is straightforward, dissecting its effect on patient treatment and outcome can be more challenging. The altered pattern of cardiac activation in LBBB causes electrical and mechanical ventricular dyssynchrony, influences ischemia detection on the surface electrocardiogram, and affects stress testing and imaging modalities dependent on wall motion and thickening. Restoration of synchrony by biventricular pacing can improve symptoms and longevity in carefully selected patients. The diagnostic, prognostic, and therapeutic implications of LBBB across this spectrum are discussed in this review.
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Smith SW, Dodd KW, Henry TD, Dvorak DM, Pearce LA. Diagnosis of ST-Elevation Myocardial Infarction in the Presence of Left Bundle Branch Block With the ST-Elevation to S-Wave Ratio in a Modified Sgarbossa Rule. Ann Emerg Med 2012; 60:766-76. [DOI: 10.1016/j.annemergmed.2012.07.119] [Citation(s) in RCA: 131] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2012] [Revised: 07/20/2012] [Accepted: 07/24/2012] [Indexed: 12/12/2022]
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Kayani WT, Huang HD, Bandeali S, Virani SS, Wilson JM, Birnbaum Y. ST elevation: telling pathology from the benign patterns. Glob J Health Sci 2012; 4:51-63. [PMID: 22980232 PMCID: PMC4776946 DOI: 10.5539/gjhs.v4n3p51] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2012] [Revised: 03/19/2012] [Accepted: 03/11/2012] [Indexed: 12/20/2022] Open
Abstract
Benefits of early reperfusion in patients presenting with acute ST elevation myocardial infarction (STEMI) are well known. The American College of Cardiology / American Heart Association guidelines recommend triage decisions are made within 10 minutes of performing initial electrocardiogram (ECG). Since many patients presenting with ischemic symptoms may have ST elevation (STE) at baseline, not all STE signify transmural ischemia. Benign patterns can be easy to find in some cases. However, patients with benign STE at baseline (left ventricular hypertrophy, early repolarization pattern) may have ongoing ischemia and present with Non-ST elevation myocardial infarction (NSTEMI) or even STEMI superimposed on the benign pattern. The ability of clinicians to distinguish between ischemic and non ischemic STE varies widely and is affected by prevalence of such changes in patient population. More studies need to be done to delineate the criteria to clearly distinguish between ischemic and non ischemic ST elevation.
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ST elevation: differentiation between ST elevation myocardial infarction and nonischemic ST elevation. J Electrocardiol 2011; 44:494.e1-494.e12. [DOI: 10.1016/j.jelectrocard.2011.06.002] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2011] [Indexed: 01/28/2023]
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Tabas JA, Rodriguez RM, Seligman HK, Goldschlager NF. Electrocardiographic Criteria for Detecting Acute Myocardial Infarction in Patients With Left Bundle Branch Block: A Meta-analysis. Ann Emerg Med 2008; 52:329-336.e1. [DOI: 10.1016/j.annemergmed.2007.12.006] [Citation(s) in RCA: 65] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2006] [Revised: 10/29/2007] [Accepted: 12/04/2007] [Indexed: 11/16/2022]
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Smith SW, Heegaard W, Bachour FA, Brady WJ. Acute myocardial infarction with left bundle-branch block: disproportional anterior ST elevation due to right ventricular myocardial infarction in the presence of left bundle-branch block. Am J Emerg Med 2008; 26:342-7. [DOI: 10.1016/j.ajem.2007.05.032] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2007] [Accepted: 05/25/2007] [Indexed: 11/27/2022] Open
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Early detection and diagnosis of acute myocardial infarction: the potential for improved care with next-generation, user-friendly electrocardiographic body surface mapping. Am J Emerg Med 2007; 25:1063-72. [DOI: 10.1016/j.ajem.2007.06.011] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2007] [Revised: 06/18/2007] [Accepted: 06/19/2007] [Indexed: 11/23/2022] Open
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Barold SS, Herweg B. Electrocardiographic Diagnosis of Myocardial Infarction during Left Bundle Branch Block. Cardiol Clin 2006; 24:377-85, viii. [PMID: 16939830 DOI: 10.1016/j.ccl.2006.05.002] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The electrocardiographic diagnosis of myocardial infarction (MI) in the presence of left bundle branch block (LBBB) has long been considered problematic or even almost impossible. Many proposed ECG markers in the old literature have now been discarded. However, the advent of reperfusion therapy has generated greater interest in the ECG diagnosis of acute MI in LBBB where ST-segment deviation is the only useful sign. As such, the ST-segment criteria cannot be used to rule out MI, but they can help to rule it in. Criteria for old MI (based on QRS changes) have not been reevaluated for almost 20 years and continue to exhibit low sensitivity, but high specificity.
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Affiliation(s)
- S Serge Barold
- Division of Cardiology, University of South Florida College of Medicine and Tampa General Hospital, Tampa, FL 33606, USA.
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Franco G. Agreement of medical decisions in occupational health as a quality requirement. Int Arch Occup Environ Health 2006; 79:607-11. [PMID: 16450158 DOI: 10.1007/s00420-006-0084-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2005] [Accepted: 01/03/2006] [Indexed: 10/25/2022]
Abstract
OBJECTIVE Workers' medical examination by the occupational physician (OPs) is a decision-making process whose output consists of a variety of evaluations, including assessment of fitness for work. The medical literature reports that there is no complete agreement among OPs assessing the same workers, evidencing a critical aspect of professional performance. This study aims at evaluating the inter-individual variability of medical decisions by different occupational physicians. METHODS Four specialists in occupational medicine participated in the study. Each specialist examined 100 records of subjects with different medical conditions selected from about 2,500 health care workers. Each physician completed a form including the following items: assessment of fitness for work, advice to workers, need of further investigations, report of occupational disease, recommendation for the general practitioner. To assess the inter-individual variability the percent agreement and the agreement strength or Cohen's kappa were measured. RESULTS The study shows a variable agreement in the assessment of fitness for work among different professionals, with percent agreement ranging from 58% for the whole group to an average of 77% for physicians' pairs. By taking into account the variability expected by chance, the agreement ranged from fair to substantial. The agreement of other decisions (workers' advice, referral to other specialists, request of further investigation, report of occupational disease, recommendation for the general practitioner) was more variable. CONCLUSION The study shows that an inter-individual variability exists for some decisions taken by OPs. According to the need to continuously improve professional practice, in the absence of qualitative standards based on the outcome, reduction of inter-individual variability that should be considered as a quality requirement of the performance of the occupational physician.
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Affiliation(s)
- Giuliano Franco
- Azienda Ospedaliera-Universitaria Policlinico di Modena, Università di Modena e Reggio Emilia, Largo del Pozzo, 71, 41100, Modena, Italy.
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Wong CK, Stewart RAH, Gao W, French JK, Raffel C, White HD. Prognostic differences between different types of bundle branch block during the early phase of acute myocardial infarction: insights from the Hirulog and Early Reperfusion or Occlusion (HERO)-2 trial. Eur Heart J 2005; 27:21-8. [PMID: 16269419 DOI: 10.1093/eurheartj/ehi622] [Citation(s) in RCA: 82] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
AIMS Bundle branch block (BBB) early during acute myocardial infarction (AMI) is often considered high risk for mortality. Little is known about how different BBB types influence prognosis. METHODS AND RESULTS The HERO-2 trial recruited 17 073 patients with ischaemic symptoms lasting >30 min and either ST elevation with or without right bundle branch block (RBBB) or presumed-new left bundle branch block (LBBB). Electrocardiograms were performed before and 60 min after the start of fibrinolytic therapy. Using patients with normal intraventricular conduction as a reference, odds ratios (ORs) for 30-day mortality were calculated for different BBB types (LBBB, RBBB with anterior AMI, and RBBB with inferior AMI) present at randomization and/or 60 min, with adjustment for recruitment region, pre-infarction characteristics, time to randomization, hemodynamics, and Killip class. At randomization, the 873 patients (5.11%) with BBB had worse baseline characteristics than patients without BBB. In patients presenting with LBBB (n=300), the ORs for 30-day mortality were 1.90 (95% CI 1.39-2.59) before and 0.68 (0.48-0.99) after adjustment for other prognosticators. In patients presenting with RBBB (n=415) and anterior AMI, the ORs were 3.52 (2.82-4.38) before and 2.48 (1.93-3.19) after adjustment. In patients presenting with RBBB and inferior AMI (n=158), the ORs were 1.74 (1.06-2.86) before and 1.22 (0.71-2.08) after adjustment. Within 60 min, 143 patients (0.92%) developed new BBB. The adjusted ORs for 30-day mortality were 2.97 (1.16-7.57) in the 25 patients with new LBBB, 3.84 (2.38-6.22) in the 100 with new RBBB and anterior AMI, and 2.23 (0.54-9.21) in the 18 with new RBBB and inferior AMI. CONCLUSION RBBB accompanying anterior AMI at presentation and new BBB (including LBBB) early after fibrinolytic therapy are independent predictors of high 30-day mortality. These electrocardiographic features should be considered in risk stratification to identify high-risk patients.
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Affiliation(s)
- Cheuk-Kit Wong
- Cardiovascular Research Unit, Green Lane Cardiovascular Service, Auckland City Hospital, Private Bag 92024, Auckland 1030, New Zealand
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Wong CK, French JK, Aylward PEG, Stewart RAH, Gao W, Armstrong PW, Van De Werf FJJ, Simes RJ, Raffel OC, Granger CB, Califf RM, White HD. Patients With Prolonged Ischemic Chest Pain and Presumed-New Left Bundle Branch Block Have Heterogeneous Outcomes Depending on the Presence of ST-Segment Changes. J Am Coll Cardiol 2005; 46:29-38. [PMID: 15992631 DOI: 10.1016/j.jacc.2005.02.084] [Citation(s) in RCA: 61] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/18/2004] [Revised: 02/02/2005] [Accepted: 02/08/2005] [Indexed: 11/19/2022]
Abstract
OBJECTIVES The purpose of this research was to examine the prognostic value of ST-segment changes (concordant ST-segment elevation and/or precordial V1 to V3 ST-segment depression) during presumed-new left bundle branch block (LBBB) in patients receiving fibrinolytic therapy. BACKGROUND These patients are often considered high-risk, but their outcome is not well-defined. METHODS The Hirulog and Early Reperfusion or Occlusion (HERO)-2 trial compared bivalirudin with heparin in patients receiving streptokinase for ST-segment elevation or presumed-new LBBB. Each patient with LBBB was matched with a control (with normal intraventricular conduction) for age, gender, pulse rate, systolic blood pressure, Killip class, and region. RESULTS A total of 300 patients had LBBB (92 with and 208 without ST-segment changes) and 15,340 had normal conduction. Acute myocardial infarction (AMI) occurred in 80.7% of LBBB patients and 88.7% of controls (p = 0.006). ST-segment changes were specific (96.6%) but not sensitive (37.8%) for enzymatic diagnosis of AMI. Mortality at 30 days was similar in LBBB patients with ST-segment changes (21.7%) and controls (25.0%, p = 0.563), but lower in LBBB patients without ST-segment changes than in controls (13.5% vs. 21.6%, p = 0.022). In the whole HERO-2 cohort, the LBBB patients with ST-segment changes had higher mortality than patients with normal conduction (odds ratio [OR] 1.37, 95% confidence interval [CI] 0.78 to 2.42). The LBBB patients without ST-segment changes had lower mortality than patients with normal conduction (OR 0.52, 95% CI 0.33 to 0.80). CONCLUSIONS ST-segment changes during LBBB are specific for the diagnosis of AMI and predict 30-day mortality; LBBB patients without ST-segment changes have lower adjusted 30-day mortality than those with normal conduction. Trials are required to determine the best treatment for high-risk and low-risk patients with LBBB.
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Affiliation(s)
- Cheuk-Kit Wong
- Cardiovascular Research Unit, Green Lane Hospital, Auckland, New Zealand
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