Left atrial function in middle-aged men and women with and without paroxysmal atrial fibrillation: Data from the Akershus Cardiac Examination (ACE) 1950 study.

PURPOSE: To assess left atrial (LA) function in individuals with known paroxysmal atrial fibrillation (AF) compared with healthy and nonhealthy individuals without atrial fibrillation. METHODS: The Akershus Cardiac Examination 1950 Study included 3,706 individuals all born in 1950. LA strain assessment of reservoir (LASr), conduit (LAScd) and contractile (LASct) functions were performed in all participants by investigators blinded to clinical data. Participants with cardiovascular disease, obesity, diabetes, pulmonary or renal disease were defined as nonhealthy, and those without as healthy. Patients with paroxysmal AF were identified through medical history and ECG documentation. RESULTS: LA strain assessment was feasible in 3,229 (87%) of the participants (50% women). The healthy group (n = 758) had significantly higher LASr and LAScd than the nonhealthy (n = 2,376), but LASct was similar between the groups. Participants with paroxysmal AF had significantly lower values of all strain parameters than the other groups. Multivariable logistic regression showed a significantly reduced probability of having AF per standard deviation increase in LASr and LASct. A nonlinear restricted cubic spline model fitted better with the association of LASr with paroxysmal AF than the linear model, and LA strain values below the population mean associated with an increased probability of having AF, but for values above the population mean no such association was present. CONCLUSION: Compared to participants without AF, those with known paroxysmal AF had significantly lower values of all LA strain parameters during sinus rhythm. Lower values of LA strain were associated with a significantly increased probability of having AF.

Serial blood pressure measurements, left ventricular remodelling and cardiovascular outcomes.

BACKGROUND: Hypertension is a risk factor for the development of cardiovascular disease. Whether serial blood pressure (BP) measurements are more closely associated with subclinical left ventricular (LV) remodelling and better predict risk of cardiovascular events over individual BP measurements are not known. METHODS: We assessed systolic BP, diastolic BP and pulse pressure at several time points during adulthood in 1333 women and 1211 men participating in the Akershus Cardiac Examination 1950 Study. We defined serial BP measurements as the sum of averaged BPs from adjacent consecutive visits indexed to total exposure time between measurements. We assessed the associations between serial and individual BP measurements and (1) LV structure, function and volumes and (2) incident myocardial infarction, ischemic stroke, heart failure and cardiovascular death. RESULTS: All indices of higher serial BP measurements were associated with increased indexed LV mass, and the associations were stronger than those of individual BP measurements. Serial diastolic BP pressure was strongly and inversely associated with LV systolic function, while higher serial systolic BP was primarily associated with higher LV volumes. Both serial systolic (incidence rate ratio [IRR] 1.10, 95% CI 1.03 to 1.17) and diastolic BPs (IRR 1.14, 95% CI 1.02 to 1.27) were associated with increased incidence of clinical events. CONCLUSION: In healthy community dwellers without established cardiovascular disease, different serial BP indices associate strongly with LV remodelling and cardiovascular outcomes. Whether the use of serial BP indices for guiding treatment is superior to individual measurements should be explored in additional prospective studies.

Prediction of incident atrial fibrillation with cardiac biomarkers and left atrial volumes.

OBJECTIVE: Atrial fibrillation is a common arrhythmia associated with risk of stroke, heart failure and death. We aimed to elucidate the associations of cardiac biomarkers, echocardiographic left atrial volumetric indices and risk of prevalent and incident atrial fibrillation in the general population. METHODS: We assessed cardiac troponin T (cTnT), N-terminal pro-B-type natriuretic peptide (NT-proBNP), growth differentiation factor 15 (GDF-15), maximum (LAVimax) and minimum (LAVimin) indexed left atrial volumes and left atrial emptying fraction (LAEF) in subjects born in 1950 participating in the prospective observational cohort, Akershus Cardiac Examination 1950 Study. The Cohorts for Heart and Ageing Research in Genomic Epidemiology for Atrial Fibrillation risk score and sex was used to adjust for residual risk of atrial fibrillation. RESULTS: Out of 3487 subjects, 157 (4.5%) had prevalent and 123 (3.5%) had incident atrial fibrillation. Echocardiographic left atrial volumes and cardiac biomarkers associated with prevalent atrial fibrillation, but GDF-15 was non-significant in adjusted analysis. Incident atrial fibrillation was predicted by LAVimax (adjusted HR 1.51, 95% CI 1.30 to 1.75), LAVimin (adjusted HR 1.52, 95% CI 1.35 to 1.72), LAEF (adjusted HR 1.24, 95% CI 1.04 to 1.48) and NT-proBNP (adjusted HR 1.57, 95% CI 1.32 to 1.85). cTnT and NT-proBNP provided incremental prognostic information to left atrial volumes, but GDF-15 demonstrated no prognostic value for incident atrial fibrillation. CONCLUSIONS: In the general population, echocardiographic left atrial volumetric indices and NT-proBNP, but not cTnT and GDF-15, associate with prevalent atrial fibrillation and with risk of incident atrial fibrillation. cTnT and NT-proBNP provide incremental prognostic information to echocardiography.

Associations between cardiovascular risk factors, biomarkers, and left ventricular mechanical dispersion: insights from the ACE 1950 Study.

Aims: Mechanical dispersion measures left ventricular contraction heterogeneity and is associated with the risk of sudden cardiac death. However, the associations between mechanical dispersion and cardiovascular risk factors in early mid-life, and established biomarkers of sub-clinical myocardial injury and dysfunction are not known. We aimed to examine this in the general population. Methods and results: During 2012-15, we included 2527 Norwegian individuals from the general population born in 1950, with measurements of mechanical dispersion by 2D speckle tracking echocardiography and concentrations of high-sensitivity cardiac troponin T (hs-cTnT) and N-terminal pro-B-type natriuretic peptide (NT-proBNP) available. Mechanical dispersion was calculated as the standard deviation of the contraction duration of 17 strain segments. We assessed the associations between mechanical dispersion, concentrations of hs-cTnT and NT-proBNP, and cardiovascular risk factors collected at a national health screening survey two decades earlier. At echocardiography baseline, median age was 64 (interquartile range 63.5-64.5) years, 49.8% were women, 59.1% had hypertension, and 5.9% reported established coronary artery disease. Median mechanical dispersion was 38.0 (29.5-47.0) ms, median hs-cTnT concentration 6 (4-8) ng/L, and the median NT-proBNP concentration 54 (34-93) ng/L. Mechanical dispersion was associated with both hs-cTnT and NT-proBNP concentrations in multivariable models adjusted for clinical and echocardiographic variables. High body mass index, serum triglyceride concentrations, and low resting heart rate at Age 40 were independently associated with increased mechanical dispersion two decades later. Conclusion: Established risk factors at Age 40 are associated with mechanical dispersion two decades later, and mechanical dispersion is cross-sectionally associated with biomarkers of subclinical myocardial injury and dysfunction.

Impact of Blood Pressure in the Early 40s on Left Atrial Volumes in the Mid-60s: Data From the ACE 1950 Study.

Background Echocardiographic measures of left atrial volumes are powerful predictors of cardiovascular events and important for assessing diastolic dysfunction. Despite this, there is limited knowledge of factors influencing left atrial remodeling. In particular, the impact of blood pressure in those in their early 40s on left atrial volumes later in life has not been sufficiently elucidated. Methods and Results We linked data from individuals born in 1950 who participated in the Age 40 Program, and the ACE (Akershus Cardiac Examination) 1950 Study. We divided the study population into quartiles of systolic blood pressure in their early 40s and assessed the proportion of individuals with an enlarged left atrium in their mid-60s. The associations between blood pressure and left atrial volumes were assessed in linear regression analyses. Of the 2591 individuals included in this study, 1302 (50.3%) were women, and the mean age in the Age 40 Program was 40.1±0.3 years. Systolic blood pressure was 128.1±13.6 mm Hg and diastolic blood pressure was 78.3±9.5 mm Hg. Mean age in the ACE 1950 Study was 64.0±0.6 years. The proportion of individuals with an enlarged left atrium increased across the quartiles of systolic blood pressure (P=0.001). Systolic blood pressure was independently associated with left atrial volumes; the end-systolic volume was 0.09 mL (95% CI, 0.04-0.14 mL) larger per 1-mm Hg higher systolic blood pressure. Conclusions Our findings suggest that increased blood pressure in those in their early 40s is relevant for left atrial remodeling later in life. Registration URL: https://www.clinicaltrials.gov; Unique identifier: NCT01555411.

Diagnostic Thresholds for Pre-Diabetes Mellitus and Diabetes Mellitus and Subclinical Cardiac Disease in the General Population: Data From the ACE 1950 Study.

Background Diabetes mellitus (DM) is associated with left ventricular remodeling and incident heart failure, but the association between glycated hemoglobin A1c (HbA1c) and subclinical cardiac disease is not established. We aimed to determine the associations between HbA1c and (1) echocardiographic measures of left ventricular structure and function, and (2) cardiovascular biomarkers: cardiac troponin T, NT-proBNP (N-terminal pro-B-type natriuretic peptide), and CRP (C-reactive protein). Methods and Results Participants (n=3688) born in 1950 from the population-based ACE (Akershus Cardiac Examination) 1950 Study were classified as DM (HbA1c≥6.5% or self-reported DM), pre-DM (HbA1c 5.7%-6.5%), and no-DM (HbA1c<5.7%). DM, pre-DM, and no-DM were classified in 380 (10%), 1630 (44%), and 1678 (46%) participants, respectively. Mean age was 63.9±0.7 years, mean body mass index was 27.2±4.4 kg/m2, and 49% were women. Higher HbA1c was associated with worse left ventricular systolic (ejection fraction and global longitudinal strain) and diastolic (E/e'-ratio) function, myocardial injury (cardiac troponin T), inflammation (CRP), and impaired neurohormonal homeostasis (NT-proBNP) (P<0.001 in unadjusted and P<0.01 in adjusted analysis for all). The associations between HbA1c and cardiovascular biomarkers were independent of the echocardiographic variables, and vice versa. Associations were nonlinear (P<0.05 for nonlinearity) and appeared stronger in the pre-DM range of HbA1c than the no-DM and DM range. Conclusions HbA1c was associated with indexes of subclinical cardiovascular disease, and this was more pronounced in pre-DM. Our results suggest that cardiovascular preventive measures should be considered also in subjects with hyperglycemia and HbA1c below the established DM cutoff. Registration clinicaltrials.gov. Identifier: NCT01555411.

B-Type Natriuretic Peptide Is Associated with Indices of Left Ventricular Dysfunction in Healthy Subjects from the General Population: The Akershus Cardiac Examination 1950 Study.

BACKGROUND: Concentrations of B-type natriuretic peptide (BNP) reflect myocardial distension and stress, and are associated with poor prognosis in patients with cardiovascular disease. Accordingly, we hypothesized that concentrations of BNP would be associated with indices of adverse left ventricular (LV) remodeling and early stages of LV systolic and diastolic dysfunction in healthy participants from the general population. METHODS: We measured BNP in 1757 women and 1677 men free from known coronary heart disease participating in the prospective observational Akershus Cardiac Examination 1950 Study. All study participants underwent extensive cardiovascular phenotyping at baseline, including detailed echocardiography with assessment of indexed LV mass (LVMI), diastolic [tissue Doppler e', E/e' ratio, indexed left atrial volume (LAVI), maximal tricuspid regurgitation velocity (TRVmax), and E/A ratio], and systolic [global longitudinal strain (GLS) and LV ejection fraction (LVEF)] function. RESULTS: Study participants with the highest BNP concentrations had higher GLS, LVMI, e', E/e' ratio, LAVI, TRVmax, and E/A ratio. In adjusted analyses, both GLS and LVEF exhibited significant nonlinear associations with BNP, with reduced LV systolic function observed in both the low and high concentration range of BNP. CONCLUSIONS: In healthy participants recruited from the general population, concentrations of BNP exhibit nonlinear associations with LV systolic function, and both low and high concentrations are associated with reduced LV systolic function. This supports the notion that natriuretic peptides are beneficial and elicit cardioprotective effects, and may have important implications for the interpretation of BNP measurements in the general population.

Cardiac Troponin I and T Are Associated with Left Ventricular Function and Structure: Data from the Akershus Cardiac Examination 1950 Study.

BACKGROUND: Concentrations of cardiac troponin I (cTnI) and T (cTnT) are associated with clinical cardiac outcomes, but do not correlate closely in subjects recruited from the general population. Accordingly, we hypothesized that cTnI and cTnT concentrations would be influenced by different cardiovascular (CV) and non-CV risk factors and reflect different CV phenotypes. METHODS: We measured cTnI and cTnT with last generation assays in 1236 women and 1157 men with no known CV disease participating in the prospective observational Akershus Cardiac Examination 1950 Study. All study participants underwent extensive CV phenotyping at baseline, including detailed echocardiography. RESULTS: Concentrations of cTnI were measurable in 60.3% and cTnT in 72.5% of study participants (P < 0.001), and correlated moderately (r = 0.53; P < 0.001). cTnI was more strongly associated with male sex (P = 0.018), higher education (P < 0.001), history of hypertension (P < 0.001), and age (P < 0.001), whereas cTnT was more strongly associated with eGFR (P = 0.015). Both cTnI and cTnT were inversely associated with global longitudinal strain and positively associated with LV mass index (LVMI) in analyses adjusted for CV risk factors. The association between cTnI and LVMI was stronger than the association between cTnT and LVMI (P = 0.035). Concentrations of cTnI improved diagnostic accuracy for LV hypertrophy when added to established CV risk factors, but concentrations of cTnT did not improve these models further. CONCLUSIONS: In a large community-based cohort examined with extensive echocardiography, concentrations of cTnI and cTnT are associated with subclinical LV hypertrophy and dysfunction. Concentrations of cTnI appear superior to cTnT in predicting subclinical LV hypertrophy.

Sex differences and higher upper normal limits for left atrial end-systolic volume in individuals in their mid-60s: data from the ACE 1950 Study.

AIMS: The current study aimed to describe normal values of left atrial (LA) volumes and LA emptying fraction (LAEF) in a large sample in their mid-60s from the general population and to explore sex differences. METHODS AND RESULTS: In the Akershus Cardiac Examination (ACE) 1950 Study, body surface area-indexed LA maximum (LAVimax) and minimum (LAVimin) volumes and LAEF were measured in 3489 individuals aged 63.9 ± 0.6 years from the general population. A healthy group of 832 individuals was defined. Data are presented as mean ± standard deviation (SD) and a normal range of mean ± 2 SD. T-tests were used for comparisons. In the healthy group, mean LAVimax was 25.5 ± 6.2 mL/m2 and the normal range was 13.1-37.9 mL/m2. Men had significantly larger body surface area-indexed volumes than women, but there was no difference in LAEF. The mean LAVimax for healthy men was 26.4 ± 6.5 mL/m2, for healthy women 24.9 ± 5.8 mL/m2 (P < 0.001) and the upper normal limits were 39.4 and 36.5 mL/m2, respectively. In the healthy group, 13.0% of all men and 5.4% of all women had LAVimax above the current upper normal limit of 34 mL/m2. CONCLUSION: A large proportion of healthy individuals, in particular men, had LAVimax >34 mL/m2. Our findings suggest that the recommended cut-off may be too low at the age of 65 years and above and that sex-specific cut-offs should be considered.

Left ventricular mechanical dispersion in a general population: Data from the Akershus Cardiac Examination 1950 study.

AIMS: Increased left ventricular mechanical dispersion by 2D speckle tracking echocardiography predicts ventricular arrhythmias in ischaemic heart disease and heart failure. However, little is known about mechanical dispersion in the general population. We aimed to study mechanical dispersion in the general population and in diseases associated with increased risk of cardiovascular disease. METHODS AND RESULTS: The present cross-sectional study consists of 2529 subjects born in 1950 included in the Akershus Cardiac Examination (ACE) 1950 study. Global longitudinal strain (GLS) was assessed from 17 strain segments, and mechanical dispersion calculated as the standard deviation of contraction duration of all segments. The cohort was divided according to the median value of mechanical dispersion, and multivariable linear regression models were performed with mechanical dispersion as the dependent variable. The prevalence of coronary artery disease (CAD), hypertension, obesity, and diabetes (P < 0.01 for all) was significantly higher in subjects with supra-median mechanical dispersion. In a multivariable clinical model, CAD (B = 7.05), hypertension (B = 4.15; both P < 0.001), diabetes (B = 3.39), and obesity (B = 1.89; both P < 0.05) were independently associated with increasing mechanical dispersion. When echocardiographic indices were added to the multivariable model, CAD (B = 4.38; P < 0.01) and hypertension (B = 2.86; P < 0.001) remained significant in addition to peak early diastolic tissue velocity e' (B = -2.00), GLS (B = 1.68), and ejection fraction (B = 0.22; P < 0.001 for all). CONCLUSION: In a general middle-aged population, prevalent CAD and hypertension were associated with increasing mechanical dispersion, possibly indicating elevated risk of fatal arrhythmias and sudden cardiac death. Albeit weaker, systolic and diastolic dysfunction, were also associated with increasing mechanical dispersion.

Mechanical dispersion as a marker of left ventricular dysfunction and prognosis in stable coronary artery disease.

Assessment of global longitudinal strain (GLS) is superior to ejection fraction (EF) in the evaluation of left ventricular (LV) function in patients with stable coronary artery disease (CAD). However, the role of mechanical dispersion (MD) in this context remains unresolved. We aimed to evaluate the potential role of MD as a marker of LV dysfunction and long-term prognosis in stable CAD. EF, GLS and MD were assessed in 160 patients with stable CAD, 1 year after successful coronary revascularization. Serum levels of high-sensitivity cardiac troponin I (hs-cTnI) and amino-terminal pro B-type natriuretic peptide (NT-proBNP) were quantified as surrogate markers of LV dysfunction. The primary endpoint was defined as all-cause mortality, the secondary endpoint was defined as the composite of all-cause mortality and hospitalization for acute myocardial infarction or heart failure during follow-up. Whereas no associations between EF and the biochemical markers of LV function were found, both GLS and MD correlated positively with increasing levels of hs-cTnI (R = 0.315, P < 0.001 and R = 0.442, P < 0.001, respectively) and NT-proBNP (R = 0.195, P = 0.016 and R = 0.390, P < 0.001, respectively). Median MD was 46 ms (interquartile range [IQR] 37-53) and was successfully quantified in 96% of the patients. During a median follow-up of 8.4 (IQR 8.2-8.8) years, 14 deaths and 29 secondary events occurred. MD was significantly increased in non-survivors, and provided incremental prognostic value when added to EF and GLS. NT-proBNP was superior to the echocardiographic markers in predicting adverse outcomes. MD may be a promising marker of LV dysfunction and adverse prognosis in stable CAD.

Prevalence of atrial fibrillation and cardiovascular risk factors in a 63-65 years old general population cohort: the Akershus Cardiac Examination (ACE) 1950 Study.

OBJECTIVES: To investigate the sex-specific prevalence of atrial fibrillation (AF), including subclinical AF found by screening in a general population aged 63-65 years. The prevalence of cardiovascular risk factors and their association with AF will also be investigated. DESIGN: Cross-sectional analysis of an observational, prospective, longitudinal, population-based cohort study. SETTING: General population in Akershus county, Norway. PARTICIPANTS: Women and men born in 1950. We included 3706 of 5827 eligible individuals (63.6%); 48.8% were women. METHODS: All participants underwent extensive cardiovascular examinations, including 12-lead ECG. History of AF and other cardiovascular diseases were self-reported. Subsequent validation of all reported or detected AF diagnoses was performed. RESULTS: Mean age was 63.9±0.7 years. Prevalence of ECG-verified AF was 4.5% (women 2.4%, men 6.4%; p<0.001), including screen-detected AF in 0.3% (women 0.1%, men 0.6%; p<0.01). Hypertension was found in 62.0% (women 57.8%, men 66.0%; p<0.001). Overweight or obesity was found in 67.6% (women 59.8%, men 74.9%; p<0.001). By multivariate logistic regression, risk factors associated with AF were height (OR 1.67 per 10 cm; 95% CI 1.26 to 2.22; p<0.001), weight (OR 1.15 per 10 kg; 95% CI 1.01 to 1.30; p=0.03), hypertension (OR 2.49; 95% CI 1.61 to 3.86; p<0.001), heart failure (OR 3.51; 95% CI 1.71 to 7.24; p=0.001), reduced estimated glomerular filtration rate (OR 2.56; 95% CI 1.42 to 4.60; p<0.01) and at least one first-degree relative with AF (OR 2.32; 95% CI 1.63 to 3.31; p<0.001), whereas male sex was not significantly associated (OR 1.00; 95% CI 0.59 to 1.68; p=0.99). CONCLUSION: In this cohort from the general population aged 63-65 years, we found a higher prevalence of known AF than previously reported below the age of 65 years. The additional yield of single time point screening for AF was low. Body size and comorbidity may explain most of the sex difference in AF prevalence at this age. TRIAL REGISTRATION NUMBER: NCT01555411; Results.

Troponinas de alta sensibilidad T vs I en Sindrome Coronario Agudo: Predicción de lesiones coronarias significativas y pronóstico a largo plazo / High-Sensitivity Troponin T vs I in Acute Coronary Syndrome: Prediction of Significant Coronary Lesions and Long-term Prognosis

Antecedentes: Los ensayos de troponinas cardíacas de alta sensibilidad (hs-cTn) tanto T e I son una herramienta crucial y bien establecida para el diagnóstico de infarto agudo de miocardio (IAM), ya que se ha demostrado ampliamente su superioridad respecto a las antiguas determinaciones de troponina. Sin embargo, eventuales diferencias entre ambos ensayos en la predicción de lesiones coronarias significativas y el pronóstico a largo plazo en pacientes con síndrome coronario agudo (SCA) no han sido aclarados completamente. Métodos: Se evaluaron las concentraciones séricas de hs-cTnT (Roche), hs-cTnI (Abbott) y porción amino-terminal del pro-péptido natriurético tipo B (NT-proBNP) (Roche) en 390 pacientes con SCA sin elevación del segmento ST, y se relacionaron con lesiones coronarias significativas detectadas por angiografía coronaria (definidas como estenosis >50% del diámetro luminal, con necesidad de revascularización) y con la precisión pronóstica de mortalidad cardiovascular, mortalidad por cualquier causa, así como también con el punto final compuesto por mortalidad cardiovascular y hospitalizaciones por IAM o insuficiencia cardiaca. Resultados: La media (+DE) del seguimiento fue de 2921+168 días. Las concentraciones absolutas de hs-cTnI fueron significativamente mayores que las concentraciones de hs-cTnT. La relación entre los biomarcadores analizados y lesiones coronarias significativas en angiografía coronaria, cuantificada por el área bajo la curva ROC (AUC), no reveló diferencias entre hs-cTnT [AUC, 0,81; IC del 95%, 0,77- 0,86] y hs-cTnI (AUC, 0,81; IC del 95%, 0,76-0,86; P=NS). Sin embargo, NT-proBNP fue superior a ambos ensayos de hs-cTn en relación con la precisión pronóstica tanto para mortalidad cardiovascular y por cualquier causa, como para el punto final compuesto durante el seguimiento, aún también en análisis multivariados. Conclusiones: Los determinaciones de hs-cTnT y hs-cTnI mostraron una capacidad similar para predecir lesiones coronarias significativas en pacientes con SCA sin elevación del segmento ST. NT-proBNP fue superior a ambos ensayos de uscTn, como marcador de pronóstico a largo plazo en este grupo de pacientes.

Background: High-sensitivity cardiac troponin (hs-cTn) T and I assays are established as crucial tools for the diagnosis of acute myocardial infarction (AMI), as they have been found superior to old troponin assays. However, eventual differences between the assays in prediction of significant coronary lesions and long-term prognosis in patients with acute coronary syndrome (ACS) have not been fully unraveled. Methods: Serum concentrations of hs-cTnT (Roche), hs-cTnI (Abbott), and amino-terminal pro-B-type natriuretic peptide (NT-proBNP; Roche) in 390 non-ST-elevation (NSTE) ACS patients were evaluated in relation to significant coronary lesions on coronary angiography (defined as a stenosis >50% of the luminal diameter, with need for revascularization) and prognostic accuracy for cardiovascular mortality, all-cause mortality, as well as the composite end point of cardiovascular mortality and hospitalizations for AMI or heart failure. Results: The mean+SD follow-up was 2921+168 days. Absolute hs-cTnI concentrations were significantly higher than the hs-cTnT concentrations. The relationship between analyzed biomarkers and significant coronary lesions on coronary angiography, as quantified by the area under the ROC curve (AUC), revealed no difference between hs-cTnT [AUC, 0.81; 95% CI, 0.77-0.86] and hs-cTnI (AUC, 0.81; 95% CI, 0.76-0.86; P=NS). NT-proBNP was superior to both hs-cTn assays regarding prognostic accuracy for both cardiovascular and all-cause mortality and for the composite end point during follow-up, also in multivariate analyses. Conclusions: The hs-cTnT and hs-cTnI assays displayed a similar ability to predict significant coronary lesions in NSTE-ACS patients. NT-proBNP was superior to both hs-cTn assays as a marker of long-term prognosis in this patient group.

High-Sensitivity Troponin T vs I in Acute Coronary Syndrome: Prediction of Significant Coronary Lesions and Long-term Prognosis.

BACKGROUND: High-sensitivity cardiac troponin (hs-cTn) T and I assays are established as crucial tools for the diagnosis of acute myocardial infarction (AMI), as they have been found superior to old troponin assays. However, eventual differences between the assays in prediction of significant coronary lesions and long-term prognosis in patients with acute coronary syndrome (ACS) have not been fully unraveled. METHODS: Serum concentrations of hs-cTnT (Roche), hs-cTnI (Abbott), and amino-terminal pro-B-type natriuretic peptide (NT-proBNP; Roche) in 390 non-ST-elevation (NSTE) ACS patients were evaluated in relation to significant coronary lesions on coronary angiography (defined as a stenosis >50% of the luminal diameter, with need for revascularization) and prognostic accuracy for cardiovascular mortality, all-cause mortality, as well as the composite end point of cardiovascular mortality and hospitalizations for AMI or heart failure. RESULTS: The mean (SD) follow-up was 2921 (168) days. Absolute hs-cTnI concentrations were significantly higher than the hs-cTnT concentrations. The relationship between analyzed biomarkers and significant coronary lesions on coronary angiography, as quantified by the area under the ROC curve (AUC), revealed no difference between hs-cTnT [AUC, 0.81; 95% CI, 0.77-0.86] and hs-cTnI (AUC, 0.81; 95% CI, 0.76-0.86; P = NS). NT-proBNP was superior to both hs-cTn assays regarding prognostic accuracy for both cardiovascular and all-cause mortality and for the composite end point during follow-up, also in multivariate analyses. CONCLUSIONS: The hs-cTnT and hs-cTnI assays displayed a similar ability to predict significant coronary lesions in NSTE-ACS patients. NT-proBNP was superior to both hs-cTn assays as a marker of long-term prognosis in this patient group.