cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.6084/m9.figshare.6273491
title: Predictors of Coronary Artery Obstructive Disease in Acute Pulmonary Edema of Unclear Origin

description: Abstract Background: Cardiogenic Acute Pulmonary Edema (APE) is considered one of the main medical emergencies, and it is the extreme manifestation of acute heart failure. The main etiology of heart failure is ischemic heart disease. To date, the definition of ischemic etiology in acute pulmonary edema was based on criteria such as: clinical history of ischemic heart disease, noninvasive examinations and, in other patients, coronary angiography. Classified as such, ischemic heart disease has been shown to be its main etiology. The high prevalence between these two diseases was evaluated, but not by the exclusive angiographic criterion, the gold standard of this pathology and the reason of this study. Objective: To evaluate the predictors of obstructive coronary artery disease in patients with acute pulmonary edema of unclear origin. Method: Patients admitted to a cardiovascular disease referral emergency unit were recruited to undergo coronary angiography if the acute pulmonary edema etiology was not adequately elucidated. Obstructive coronary disease was considered if at least one epicardial vessel had 70% of occlusion. Results: Obstructive coronary disease was classified by coronary angiography in 149 consecutively evaluated patients, and coronary artery obstruction was the outcome variable of the predictor model. Among the variables related to coronary disease, the predictor variables were the history of coronary artery disease (p &lt; 0.001) and myocardium segmental deficit at the echocardiogram (p &lt; 0.02). Conclusion: The antecedent of coronary disease and the myocardium segmental deficit at the echocardiogram were able to discriminate patients with acute pulmonary edema associated with obstructive coronary disease. Troponin values classified by two cardiologists as secondary to an acute non-ST-segment elevation myocardial infarction, and chest pain preceding the clinical picture were not able to discriminate patients with or without coronary obstruction and thus, the diagnosis of obstructive coronary disease should not be pursued based on the troponin value and/or chest pain preceding the clinical picture.
DOI: 10.6084/m9.figshare.6273491.v1
title: Predictors of Coronary Artery Obstructive Disease in Acute Pulmonary Edema of Unclear Origin

description: Abstract Background: Cardiogenic Acute Pulmonary Edema (APE) is considered one of the main medical emergencies, and it is the extreme manifestation of acute heart failure. The main etiology of heart failure is ischemic heart disease. To date, the definition of ischemic etiology in acute pulmonary edema was based on criteria such as: clinical history of ischemic heart disease, noninvasive examinations and, in other patients, coronary angiography. Classified as such, ischemic heart disease has been shown to be its main etiology. The high prevalence between these two diseases was evaluated, but not by the exclusive angiographic criterion, the gold standard of this pathology and the reason of this study. Objective: To evaluate the predictors of obstructive coronary artery disease in patients with acute pulmonary edema of unclear origin. Method: Patients admitted to a cardiovascular disease referral emergency unit were recruited to undergo coronary angiography if the acute pulmonary edema etiology was not adequately elucidated. Obstructive coronary disease was considered if at least one epicardial vessel had 70% of occlusion. Results: Obstructive coronary disease was classified by coronary angiography in 149 consecutively evaluated patients, and coronary artery obstruction was the outcome variable of the predictor model. Among the variables related to coronary disease, the predictor variables were the history of coronary artery disease (p &lt; 0.001) and myocardium segmental deficit at the echocardiogram (p &lt; 0.02). Conclusion: The antecedent of coronary disease and the myocardium segmental deficit at the echocardiogram were able to discriminate patients with acute pulmonary edema associated with obstructive coronary disease. Troponin values classified by two cardiologists as secondary to an acute non-ST-segment elevation myocardial infarction, and chest pain preceding the clinical picture were not able to discriminate patients with or without coronary obstruction and thus, the diagnosis of obstructive coronary disease should not be pursued based on the troponin value and/or chest pain preceding the clinical picture.
DOI: 10.6084/m9.figshare.6272645
title: Study with a Portable Gas Analyzer of the 6-Minute Walk Test in Heart Failure with Normal Ejection Fraction

description: Abstract Background: Few studies have used portable gas analyzers during the 6-minute walk test (6MWT) in patients with heart failure and normal ejection fraction (HFNEF). Objectives: To analyze the kinetics of hemodynamic, ventilatory, and metabolic variables in patients with HFNEF during the T6m using a portable gas analyzer. Methods: Prospective, analytical study with an intentional, non-probabilistic, convenience sample. In total, 24 patients with HFNEF and past hospital admissions due to a clinical diagnosis of heart failure (HF) were included using the 2007 criteria established by the European Society of Cardiology. Three assessments were performed: 6MWT familiarization, 6MWT with the portable gas analyzer, and cardiopulmonary exercise test (CPET). Results: The heart rates (HRs) and the peak VO2 at the end of the 6MWT corresponded to 85.7% and 86.45% of the values obtained during the CPET. The final HRs after the T6m were equivalent to those obtained at the CPET anaerobic threshold (AT), with relative VO2 values at the end of the 6MWT above the VO2 of the CPET AT. There was no difference between the maximum respiratory quotient (RQ) values in these two tests, which were both above 1.0. The VE/VO2 slope descended initially and then ascended significantly after the fifth minute of the test, estimating the identification of the AT. Conclusions: In patients with HFNEF, the 6MWT represents an almost maximum effort, and is performed above the CPET AT and 85% above the maximum HR and the CPET peak VO2, with a maximum RQ similar to that in the CPET.
DOI: 10.6084/m9.figshare.6272645.v1
title: Study with a Portable Gas Analyzer of the 6-Minute Walk Test in Heart Failure with Normal Ejection Fraction

description: Abstract Background: Few studies have used portable gas analyzers during the 6-minute walk test (6MWT) in patients with heart failure and normal ejection fraction (HFNEF). Objectives: To analyze the kinetics of hemodynamic, ventilatory, and metabolic variables in patients with HFNEF during the T6m using a portable gas analyzer. Methods: Prospective, analytical study with an intentional, non-probabilistic, convenience sample. In total, 24 patients with HFNEF and past hospital admissions due to a clinical diagnosis of heart failure (HF) were included using the 2007 criteria established by the European Society of Cardiology. Three assessments were performed: 6MWT familiarization, 6MWT with the portable gas analyzer, and cardiopulmonary exercise test (CPET). Results: The heart rates (HRs) and the peak VO2 at the end of the 6MWT corresponded to 85.7% and 86.45% of the values obtained during the CPET. The final HRs after the T6m were equivalent to those obtained at the CPET anaerobic threshold (AT), with relative VO2 values at the end of the 6MWT above the VO2 of the CPET AT. There was no difference between the maximum respiratory quotient (RQ) values in these two tests, which were both above 1.0. The VE/VO2 slope descended initially and then ascended significantly after the fifth minute of the test, estimating the identification of the AT. Conclusions: In patients with HFNEF, the 6MWT represents an almost maximum effort, and is performed above the CPET AT and 85% above the maximum HR and the CPET peak VO2, with a maximum RQ similar to that in the CPET.
DOI: 10.6084/m9.figshare.6273275
title: Drug-eluting stents Versus Coronary Artery Bypass Grafting in Multivessel Disease and Left Main Obstruction: Meta-analysis of Randomized Clinical Trials

description: Abstract Background: The choice between percutaneous coronary intervention (PCI) and coronary artery bypass grafting (CABG) remains controversial. Objective: To conduct a meta-analysis of randomized studies comparing drug-eluting stents (DES) and CABG in multivessel disease or obstruction of the left main coronary artery. Method: Electronic databases were searched systematically to evaluate results of randomized trials comparing PCI with DES versus CABG in multivessel disease and obstruction of the left main coronary artery. Ten studies were identified. Results: In the aggregated results (n = 9268), mortality at 30 days and incidence of stroke favored PCI (0.8% versus 1.5%, p = 0.005; 0.4% versus 1.5%, p &lt; 0.0001, respectively). There was no difference in mortality at 1 year (3.4% versus 3.5%, p = 0.50). The late mortality favored CABG (10.1% versus 8.5%, p = 0.01). In patients with diabetes derived from four studies (n = 3830), late mortality favored CABG (12.5% versus 9.7%, p &lt; 0.0001). In six studies of left main coronary artery obstruction (n = 4700), the incidence of stroke favored PCI (0.3% versus 1.5%, p &lt; 0.001) and there was no difference in mortality at 30 days (0.8% versus 1.3%, p = 0.15), mortality at 1 year, or late mortality (8.1% versus 8.1%). The subgroups with high SYNTAX score and diabetes were those influencing most strongly and adversely the PCI results. Conclusion: When compared with PCI, CABG was superior in regards to late mortality and inferior in regards to 30-day mortality and incidence of stroke. Diabetes and SYNTAX score strongly impacted the results.
DOI: 10.6084/m9.figshare.6273275.v1
title: Drug-eluting stents Versus Coronary Artery Bypass Grafting in Multivessel Disease and Left Main Obstruction: Meta-analysis of Randomized Clinical Trials

description: Abstract Background: The choice between percutaneous coronary intervention (PCI) and coronary artery bypass grafting (CABG) remains controversial. Objective: To conduct a meta-analysis of randomized studies comparing drug-eluting stents (DES) and CABG in multivessel disease or obstruction of the left main coronary artery. Method: Electronic databases were searched systematically to evaluate results of randomized trials comparing PCI with DES versus CABG in multivessel disease and obstruction of the left main coronary artery. Ten studies were identified. Results: In the aggregated results (n = 9268), mortality at 30 days and incidence of stroke favored PCI (0.8% versus 1.5%, p = 0.005; 0.4% versus 1.5%, p &lt; 0.0001, respectively). There was no difference in mortality at 1 year (3.4% versus 3.5%, p = 0.50). The late mortality favored CABG (10.1% versus 8.5%, p = 0.01). In patients with diabetes derived from four studies (n = 3830), late mortality favored CABG (12.5% versus 9.7%, p &lt; 0.0001). In six studies of left main coronary artery obstruction (n = 4700), the incidence of stroke favored PCI (0.3% versus 1.5%, p &lt; 0.001) and there was no difference in mortality at 30 days (0.8% versus 1.3%, p = 0.15), mortality at 1 year, or late mortality (8.1% versus 8.1%). The subgroups with high SYNTAX score and diabetes were those influencing most strongly and adversely the PCI results. Conclusion: When compared with PCI, CABG was superior in regards to late mortality and inferior in regards to 30-day mortality and incidence of stroke. Diabetes and SYNTAX score strongly impacted the results.
DOI: 10.6084/m9.figshare.6273764
title: Chagas Disease Cardiomyopathy

description: Abstract Chronic Chagas disease cardiomyopathy (CCC) is a result of low-intensity, but incessant, focal fibrosing myocarditis, caused by persistent T. cruzi infection associated with inflammation, mediated by adverse immune mechanisms. About 30 percent of infected individuals have developed throughout life the chronic cardiac form of Chagas' disease with protean clinical manifestations, such as sudden death, signs and symptoms of heart failure, cardioembolic events, arrhythmia and angioid symptoms. Sudden death and the progression of heart failure (HF) are the most common mechanisms of death in this condition. The most relevant prognostic aspects are symptoms of advanced HF (NYHA Fc III-IV), cardiomegaly, LV systolic dysfunction and nonsustained ventricular tachycardia. Preventing cardioembolic events is an important aspect in the management of patients with CCC. Oral anticoagulant agents must be prescribed for high-risk patients according to the presence of a set of risk factors: LV systolic dysfunction, apical aneurysm, altered ventricular repolarization by ECG and advanced age. The treatment of HF in patients with CCC follows the same principles applied to HF secondary to dilated cardiomyopathy of other etiologies.
DOI: 10.6084/m9.figshare.6273764.v1
title: Chagas Disease Cardiomyopathy

description: Abstract Chronic Chagas disease cardiomyopathy (CCC) is a result of low-intensity, but incessant, focal fibrosing myocarditis, caused by persistent T. cruzi infection associated with inflammation, mediated by adverse immune mechanisms. About 30 percent of infected individuals have developed throughout life the chronic cardiac form of Chagas' disease with protean clinical manifestations, such as sudden death, signs and symptoms of heart failure, cardioembolic events, arrhythmia and angioid symptoms. Sudden death and the progression of heart failure (HF) are the most common mechanisms of death in this condition. The most relevant prognostic aspects are symptoms of advanced HF (NYHA Fc III-IV), cardiomegaly, LV systolic dysfunction and nonsustained ventricular tachycardia. Preventing cardioembolic events is an important aspect in the management of patients with CCC. Oral anticoagulant agents must be prescribed for high-risk patients according to the presence of a set of risk factors: LV systolic dysfunction, apical aneurysm, altered ventricular repolarization by ECG and advanced age. The treatment of HF in patients with CCC follows the same principles applied to HF secondary to dilated cardiomyopathy of other etiologies.
DOI: 10.6084/m9.figshare.6503090
title: Spatial Analysis and Mortality Trends Associated with Hypertensive Diseases in the States and Regions of Brazil from 2010 to 2014

description: Abstract Background: Systemic Arterial Hypertension (SAH) represents the most relevant worsening factor and one of the major risk factors for cardiovascular diseases. Objectives: To analyze trends in the mortality rate associated with hypertensive diseases in Brazil from 2010 to 2014, for states as well as regions. Methods: An epidemiological study was performed from aggregate data obtained in populational strata. Cartographic data of the Brazilian territory in "shapefile" were provided by IBGE. Records of mortality associated with arterial hypertension were obtained in DATASUS, through notifications filtered by category I.10 of the International Classification of Diseases (ICD-10). The criterion of statistical significance was a two-tailed p-value &lt; 0.05. Results: The increase in age was progressively associated with an increase in the mean number of deaths related to hypertensive diseases between the years 2010 and 2014. In the age groups between 50-59 years, 60-69 years, 70-79 years and 80 or more years, the mean and standard deviation for the mortality rate were, respectively: 15.11% (35.35); 24.14% (55.34); 35.07% (81.03) and 57.87% (139.08). The overall mortality rate per 10,000 inhabitants varied between the regions: north (1.25); northeast (2.69); center-west (2.06); southeast (2.48) and south (2.04). Conclusions: The mortality rate associated with hypertensive diseases was higher in the southeastern and northeastern states of Brazil, and remained stable between 2010 and 2014. Increased age and brown color were predictors of higher mortality.
DOI: 10.6084/m9.figshare.6503090.v1
title: Spatial Analysis and Mortality Trends Associated with Hypertensive Diseases in the States and Regions of Brazil from 2010 to 2014

description: Abstract Background: Systemic Arterial Hypertension (SAH) represents the most relevant worsening factor and one of the major risk factors for cardiovascular diseases. Objectives: To analyze trends in the mortality rate associated with hypertensive diseases in Brazil from 2010 to 2014, for states as well as regions. Methods: An epidemiological study was performed from aggregate data obtained in populational strata. Cartographic data of the Brazilian territory in "shapefile" were provided by IBGE. Records of mortality associated with arterial hypertension were obtained in DATASUS, through notifications filtered by category I.10 of the International Classification of Diseases (ICD-10). The criterion of statistical significance was a two-tailed p-value &lt; 0.05. Results: The increase in age was progressively associated with an increase in the mean number of deaths related to hypertensive diseases between the years 2010 and 2014. In the age groups between 50-59 years, 60-69 years, 70-79 years and 80 or more years, the mean and standard deviation for the mortality rate were, respectively: 15.11% (35.35); 24.14% (55.34); 35.07% (81.03) and 57.87% (139.08). The overall mortality rate per 10,000 inhabitants varied between the regions: north (1.25); northeast (2.69); center-west (2.06); southeast (2.48) and south (2.04). Conclusions: The mortality rate associated with hypertensive diseases was higher in the southeastern and northeastern states of Brazil, and remained stable between 2010 and 2014. Increased age and brown color were predictors of higher mortality.
DOI: 10.6084/m9.figshare.6503342
title: Correlation Between the Complexity of Coronary Lesions and High-Sensitivity Troponin Levels in Patients with Acute Coronary Syndrome

description: Abstract Background: Cardiovascular diseases are the leading cause of death in Brazil. Biochemical markers have diagnostic and prognostic importance in acute coronary syndromes (ACSs), with troponin as the preferred biomarker. Studies have already demonstrated a positive relationship between increased levels of high-sensitivity troponin (hsTn) and prognosis. However, few studies have correlated hsTn levels with the complexity of coronary lesions. Objectives: To compare hsTn levels with the complexity of coronary lesions according to the SYNTAX score, and to correlate the levels of this biomarker with the TIMI and GRACE scores in patients with ACS. Methods: Retrospective, cross-sectional study with 174 patients with ACS. The correlation between variables was assessed by the nonparametric Spearman's rank correlation, and statistical analysis was performed by the SPSS program, with a significance level of 5%. Results: Mean age was 63 years, and most patients were women (52.9%), hypertensive, non-diabetic and non-smokers. Nineteen percent of the patients had STEMI, 43.1% NSTEMI, and 36.8% unstable angina. Most were in Killip 1 (82.8%). Median hsTn was 67 pg/mL. Median risk scores were 3, 121 and 3 in the TIMI, GRACE and SYNTAX scores, respectively. There was a correlation of hsTn with SYNTAX (p &lt;0.001, r = 0.440), TIMI (p &lt; 0.001, r = 0.267) and GRACE (p = 0.001, r = 0.261) scores. Conclusion: A positive linear correlation was found of hsTn levels with the complexity of coronary lesions, and with the TIMI and GRACE clinical scores.
DOI: 10.6084/m9.figshare.6503342.v1
title: Correlation Between the Complexity of Coronary Lesions and High-Sensitivity Troponin Levels in Patients with Acute Coronary Syndrome

description: Abstract Background: Cardiovascular diseases are the leading cause of death in Brazil. Biochemical markers have diagnostic and prognostic importance in acute coronary syndromes (ACSs), with troponin as the preferred biomarker. Studies have already demonstrated a positive relationship between increased levels of high-sensitivity troponin (hsTn) and prognosis. However, few studies have correlated hsTn levels with the complexity of coronary lesions. Objectives: To compare hsTn levels with the complexity of coronary lesions according to the SYNTAX score, and to correlate the levels of this biomarker with the TIMI and GRACE scores in patients with ACS. Methods: Retrospective, cross-sectional study with 174 patients with ACS. The correlation between variables was assessed by the nonparametric Spearman's rank correlation, and statistical analysis was performed by the SPSS program, with a significance level of 5%. Results: Mean age was 63 years, and most patients were women (52.9%), hypertensive, non-diabetic and non-smokers. Nineteen percent of the patients had STEMI, 43.1% NSTEMI, and 36.8% unstable angina. Most were in Killip 1 (82.8%). Median hsTn was 67 pg/mL. Median risk scores were 3, 121 and 3 in the TIMI, GRACE and SYNTAX scores, respectively. There was a correlation of hsTn with SYNTAX (p &lt;0.001, r = 0.440), TIMI (p &lt; 0.001, r = 0.267) and GRACE (p = 0.001, r = 0.261) scores. Conclusion: A positive linear correlation was found of hsTn levels with the complexity of coronary lesions, and with the TIMI and GRACE clinical scores.
DOI: 10.6084/m9.figshare.6502958
title: Epidemiological Characteristics and Mortality Predictors in Patients Over 70 Years Submitted to Coronary Artery Bypass Grafting

description: Abstract Background: Coronary artery disease is the leading cause of death worldwide, with age being an independent risk factor for mortality in patients submitted to surgical revascularization. Objective: To evaluate the mortality risk predictors in patients older than 70 years submitted to myocardial revascularization. Methods: This is a retrospective cohort study of a cardiac surgery database. Logistic regression was used to assess independent death predictors. Results: A total of 372 patients submitted to surgical revascularization from 2004 to 2012 were assessed. The main cardiovascular risk factor was hypertension, followed by diabetes mellitus. Mortality at 30 days was 19.35%. The presence of peripheral vascular disease (OR: 2,47), emergency surgery (OR: 4,86) and combined valve procedure (OR: 3,86) were independent predictors of death. Conclusion: The surgical procedure in elderly patients showed a higher mortality than in the general population. Peripheral vascular disease, emergency surgery and combined valve procedures increased the risk of death in these patients.
DOI: 10.6084/m9.figshare.6502958.v1
title: Epidemiological Characteristics and Mortality Predictors in Patients Over 70 Years Submitted to Coronary Artery Bypass Grafting

description: Abstract Background: Coronary artery disease is the leading cause of death worldwide, with age being an independent risk factor for mortality in patients submitted to surgical revascularization. Objective: To evaluate the mortality risk predictors in patients older than 70 years submitted to myocardial revascularization. Methods: This is a retrospective cohort study of a cardiac surgery database. Logistic regression was used to assess independent death predictors. Results: A total of 372 patients submitted to surgical revascularization from 2004 to 2012 were assessed. The main cardiovascular risk factor was hypertension, followed by diabetes mellitus. Mortality at 30 days was 19.35%. The presence of peripheral vascular disease (OR: 2,47), emergency surgery (OR: 4,86) and combined valve procedure (OR: 3,86) were independent predictors of death. Conclusion: The surgical procedure in elderly patients showed a higher mortality than in the general population. Peripheral vascular disease, emergency surgery and combined valve procedures increased the risk of death in these patients.