Predictors Of Multivessel Disease Research Articles

Influence of Smoking on The Location of Acute Myocardial Infarctions

Objective: To determine the frequency of smokers and to compare the frequency of smokers among patients with inferior and anterior acute myocardial infarction amongst patients presenting with acute myocardial infarction at a Tertiary Care Hospital. Subjects And Methods: This cross-sectional study was conducted on 226 at the Adult Cardiology Department of the National Institute of Cardiovascular Disease (NICVD), Karachi for six months from 20-07-2019 till 20-01-2020. After obtaining verbal consent, researchers prospectively collected data from the participants. The study included 226 patients who were diagnosed with the appropriate conditions. Frequency and percentages were used to present qualitative data, while mean and standard deviation were used to present quantitative data. To see how to effect modifiers affected the outcome, researchers used stratification to keep track of them. For statistical significance, the post-stratification chi-square test was used. Results: A total of 226 presenting with acute myocardial infarction were included in this study. The mean age in our study was 55.92±10.49 years. Out of 226 patients with acute myocardial infarction, 130 (57.5%) and 96 (42.5) smoked and did not smoke respectively. Comparison of smoking status in patients who had anterior and inferior myocardial infarction showed that 39 (53.4%) and 51 (51%) smoked respectively. Conclusion: Smoking is a well-recognized strong modifiable risk factor and predictor of multivessel disease. Smoking cessation has been consistently associated with a mortality benefit in both stable coronary artery disease and post-acute coronary syndromes. Consequently, smoking cessation is one of the cornerstones of secondary prevention despite the improvement in the management of ACS with PCI and pharmacotherapy Keywords: Smoking, coronary vessels, territory and ST elevated myocardial infarction.

PREDICTORS OF MULTIVESSEL CORONARY ARTERY DISEASE IN YOUNG PATIENTS PRESENTING WITH ST-SEGMENT ELEVATION MYOCARDIAL INFARCTION

Objectives: Premature coronary artery disease (CAD) is on the rise in our population, and multivessel disease (MVD) is no longer an uncommon finding in young patients. Therefore, aim of this study was to determine the predictors of MVD in young patients who presented with ST-Segment Elevation Myocardial Infarction (STEMI). Methodology: For this study, we enrolled 294 young adult (18-40 years) patients with STEMI. MVD was diagnosed based on angiography. Demographic characteristics and baseline risk profiles were considered for the univariate and multivariate analyses to determine the predictors of MVD. Results: Out of 294 patients, 90.5% (266) were males, and the mean age was 35.45 ± 4.07 years. Our 24.1% (71) patients were hypertensive (HTN), and 36.1% (106) were smokers. A total of 94 patients had MVD. Patients with MVD were older and more likely to have diabetes (DM) and HTN than their counterparts. Only age and DM were found to be significant independent predictors of MVD. The risk of developing MVD was higher in diabetics, with adjusted odds ratios (ORs) [95% CI] of 2.47 [1.23-4.97; p=0.011]. Conclusion: In conclusion, we showed that age and DM are independent predictors of MVD in a young Pakistani adult population presenting with STEMI. However, none of the other risk factors, such as obesity, male gender or smoking, were found to be significantly associated with MVD in Pakistani adults with premature CAD. Although significantly associated, HTN does not prove to be an independent predictor of multivessel CAD in young adults.

The detection of multivessel coronary artery disease: the value of quantitative myocardial blood flow and coronary flow reserve assessment

Abstract Background/Introduction The recent Cadmium-Zinc-Telluride (CZT) camera for MPS allows evaluating absolute MBF and CFR, possibly increasing the accuracy in detecting of multivessel CAD. Purpose To evaluate the accuracy of myocardial blood flow (MBF) and coronary flow reserve (CFR) quantitation performed by myocardial perfusion scintigraphy (MPS) for the detection of multivessel coronary artery disease (CAD). Methods Fifty-two patients with suspected or known CAD were enrolled in the study. All patients underwent CZT MPS, with the evaluation of MBF and CFR, followed by invasive coronary angiography. According to MPS and coronary angiography results, patients were divided into three groups. 1) non-obstructive CAD and normal MPS scan (control group) (n=7), 2) one vessel disease (1VD) (n=16), with significant coronary stenosis (≥70%) in one major epicardial coronary artery, 3) multivessel disease (MVD) group (n=29), with two or more major epicardial coronary arteries with (≥70%) stenoses or with ≥50% LMA stenosis. Results Absolute MBF and CFR were significantly reduced in patients with MVD as compared to those with 1VD [0.93 (IQR 0.76; 1.39) vs 1.94 (1.37; 2.21) ml/min/g, p=0.00012] and [1.4 (IQR 1.02; 1.85) vs 2.3 (1.8; 2.67), p=0.0004], respectively. The Syntax score correlated with global stress MBF (ρ=−0.64; p<0.0001) and CFR (ρ=−0.53; p=0.0003). ROC analysis showed higher sensitivity and specificity for stress MBF (85.2% and 81%), and CFR (88.9% and 80%) compared with semiquantitative MPS stress evaluation (69% and 69%). Multivariate regression analysis showed that only stress MBF [OR (95% CI) 0.59 (0.42–0.82); p<0.0003] was an independent predictor of MVD. Conclusion The use of absolute myocardial blood flow analysis with the CZT camera may identify high risk patients, such as those with multivessel disease. This approach could be used in clinical practice, increasing the accuracy in the evaluation of patients with known or suspected coronary artery disease. Funding Acknowledgement Type of funding source: None

Fragmented QRS Complex as a Predictor of Multivessel Disease in Acute Coronary Syndrome

Background: The incidence of multivessel disease in acute coronary syndrome (ACS) is expected to be identified as early as possible in order to perform optimal management. The presence of multivessel disease can lead to ischemia or myocardial infarction. Fragmented QRS complex (fQRS) is a new electrocardiography (ECG) parameter that has been proven to be caused by ischemia or myocardial infarction.Methods: A cross-sectional study. Patients with ACS that admitted at Dr. Wahidin Sudirohusodo Makassar since December 2014 - March 2015 who are eligible were enrolled in this study.Presence of fQRS evaluated on first 12-lead ECG at hospital admission. Presence of multivessel disease based on coronary angiography. Data were analyzed by logistic regression. Data was significant if the p-value<0.05.Results: There are 63 subjects (56 men and 7 women) included in this study. Older age, history of ACS before, presence of dyslipidemia, and presence of fQRS were significantly more often in group with multivessel disease. After analyzed with logistic regression, the fQRS was the only significant predictor of multivessel disease with p value 0.003 and odds ratio 13.28.Conclusion: Presence of fQRS in the first 12-lead ECG when admitted to the hospital was an independent predictor of multivessel disease in patients with ACS.

Predictors of Multivessel Disease in Patients Undergoing In-Patient Coronary Angiography for Potential Acute Coronary Syndromes

Background: Predicting whether a patient has multivessel coronary disease prior to invasive coronary angiography has potential clinical importance as it may help guide treatment decisions. We performed a prospective analysis of patients presenting to the catheter laboratory as an inpatient for possible acute coronary syndrome (ACS) to determine predictors of MVD. Methods: 2 independent observers who were blinded to the final diagnosis prospectively reviewed all in-patient angiograms undertaken for possible ACS. The number of diseased vessels (≥ 50% stenosis) were recorded. The definition of MVD in our study was a ≥ 2 vessels with > 50% stenosis. Patient history, demographics and clinical characteristics were collected Results: 303 patients were studied, 141 had MVD. Age was significantly higher in the MVD group (65 ± 11.3 vs. 60.7 ± 12.1). A history of recent chest pain (30% vs. 7%) and previous MI (24% vs. 4%) were also higher in the MVD group. Grace score was higher in the MVD group (98 vs. 83) as was the proportion of patients with NIDDM (19% vs. 4%). Logistic regression analysis was performed to examine predictors of MVD. Pre-treatment with aspirin (OR 4.7), a final diagnosis of ACS (OR 3.3) and the presence of NIDDM (OR 8.9) were independent predictors of multi-vessel coronary disease. Conclusion: In patients presenting to the cath lab, pre-treatment with aspirin, the presence of diabetes and a final diagnosis of ACS are independently predictive of MVD.

Relationship between Baseline White Blood Cell count and C-reactive protein with Angiographic severity of Coronary Artery Disease in Patients with Acute Coronary Syndrome

Background: Inflammation has been shown to play a role in atherosclerosis and acute coronary syndrome. This study was carried out to evaluate the relationship between baseline white blood cell (WBC) count and C-reactive protein (CRP) with angiographic severity of coronary artery disease in patients with acute coronary syndrome and to identify those subsets of patients with acute coronary syndrome who may need to undergo invasive or conservative strategies.Method: A total of 100 patients with acute coronary syndrome including unstable angina, non-ST elevated myocardial infarction & ST elevated myocardial infarction were evaluated in National Institute of Cardiovascular Disease (NICVD), Dhaka with a view to correlate angiographic findings, C-reactive protein and WBC count. Results: This study observed that either raised WBC count or raised CRP independently and combination of both WBC count and CRP elevation were significantly associated with more severe coronary artery disease. Either raised WBC count or raised CRP or combination of raised WBC count and CRP were significant predictor of multivessel disease and high stenosis score. Conclusion: Elevation of WBC count and CRP in patients with acute coronary syndrome are associated with severe coronary disease. WBC count and CRP can be used as a new and even simpler tool for risk stratification in acute coronary syndrome. DOI: http://dx.doi.org/10.3329/cardio.v5i1.12209 Cardiovasc. j. 2012; 5(1): 23-29

Diagnostic accuracy of global myocardial deformation indexes in coronary artery disease: a velocity vector imaging study

The aim of our study was to assess the diagnostic accuracy of a global longitudinal strain and strain rate (GLS, GLSR) and mean radial strain and strain rate (MRS, MRSR) of the left ventricle to predict multivessel disease. In 113 patients, who underwent coronary angiography, left ventricular deformation was analysed by speckle-tracking based velocity vector imaging. In three standard apical views strain and strain rate curves were generated corresponding with two opposite basal, mid, and apical segments. The negative peaks of systolic strain and strain rate from 18 curves were averaged as GLS and GLSR. Similarly, in short axis view 6 negative systolic peaks were averaged and considered as MRS and MRSR. Four subgroups were defined: (1) without significant coronary stenosis, 0-vessel disease (0VD), (2) single-vessel disease (1VD), (3) double-vessel disease (2VD), and (4) triple-vessel disease (3VD). In comparison with patients without significant coronary artery disease, all deformation indexes were significantly decreased in patients with 3VD. The left ventricular ejection fraction (LVEF) and wall motion score index (WMSI) showed lower significance level as deformation parameters. MRSR was the strongest predictor of multivessel disease. Receiver-operating characteristic curves (ROC) showed that MRSR had the highest diagnostic accuracy. Comparing ROC areas, MRSR had significantly higher diagnostic accuracy than LVEF and WMSI. The results of our study show that global deformation indexes have a good diagnostic accuracy in differentiating multivessel disease. MRSR tended to be better in identification of 3VD than traditional indexes of global and regional left ventricular function.

Relation of Baseline Serum Potassium Levels to Angiographic Findings in Patients With Known or Suspected Coronary Artery Disease

In experimental animal studies, potassium has been demonstrated to protect against the development of atherosclerosis through a variety of mechanisms. Data regarding the role of potassium in the development of human atherosclerosis are sparse. The objective of this study was to determine the association between plasma potassium levels and angiographically defined coronary artery disease (CAD). In a cohort of 389 male patients undergoing coronary angiography for a variety of clinical indications, the association between baseline serum potassium levels and the extent of angiographically defined atherosclerosis was analyzed. Adjustments were made for clinical and laboratory variables (including inflammatory markers) known to be associated with atherosclerosis. By multivariate logistic regression analysis, baseline serum potassium levels were an independent predictor of the presence of multivessel disease (odds ratio (OR) 1.31, 95% confidence interval (CI) 1.01-1.69; P < 0.05). In addition, in the non-myocardial infarction subpopulation of patients, serum potassium was also an independent predictor of the presence of multivessel disease by multivariate logistic regression analysis (OR 1.34, 95% CI, 1.02-1.76; P < 0.05). In the myocardial infarction (MI) subpopulation, serum potassium was not a predictor of multivessel disease, possibly due to the confounding effect of hypokalemia known to be present during MI. These data demonstrate that a simple baseline serum potassium level is independently associated with the presence of multivessel disease, even in the context of clinical CAD risk factors and other established inflammatory markers.

Submaximal exercise testing early after myocardial infarction. Difficulty of predicting coronary anatomy and left ventricular performance.

Impaired left ventricular function and extensive coronary artery disease are important determinants of prognosis after acute myocardial infarction. The ability of clinical and predischarge submaximal exercise test variables to predict multivessel coronary artery disease and impaired left ventricular function was assessed in 62 survivors of acute myocardial infarction. Abnormal exercise blood pressure response and short exercise performance were predictors of multivessel disease, but exercise induced ST segment changes and clinical variables were not. Q wave infarction, high grade Killip classification, and exercise induced ST segment elevation predicted statistically significant impairment of resting left ventricular function, whereas other clinical and exercise test variables did not. Exercise induced ST segment changes were therefore of little value in detecting extensive coronary disease, although exercise induced ST elevation was an indicator of poor resting left ventricular function. Although abnormal exercise haemodynamics may detect extensive coronary artery disease, other physiological markers of reversible myocardial ischaemia are probably necessary to plan optimal management in these patients.

Predicting the extent and location of coronary artery disease during the early postinfarction period by quantitative thallium-201 scintigraphy

The ability of quantitative thallium-201 scintigraphy to predict the extent and location of coronary artery disease before hospital discharge after acute myocardial infarction was evaluated in 52 patients. All patients underwent coronary angiography and serial thallium-201 imaging either at rest (10 patients) or after submaximal exercise stress (42 patients; target heart rate 120 beats/min). Two or three vessel disease was designated if abnormal thallium-201 uptake or washout patterns, or both, were seen in two or three vascular segments, respectively. Of 156 vessels analyzed in the 52 patients, 91 stenoses of 70 percent or greater were found by angiography. Seventy-four (81 percent) of these were predicted by scintigraphy. The specificity of scintigraphy for identifying vessel stenoses was 92 percent. Sensitivity for detecting and localizing stenoses supplying an infarct zone was 96 percent compared with 62 percent for stenoses supplying myocardium remote from the acute infarct. Perfusion abnormalities were more frequently seen in the distribution of vessels with severe (90 percent or greater) stenoses than in those with moderate (70 to 90 percent) stenoses (87 versus 53 percent, p <0.01). Scintigraphy detected a greater proportion of left anterior descending and right coronary arterial stenoses than circumflex stenoses (91 and 87 versus 63 percent, respectively, p <0.006). In the 42 patients who underwent submaximal exercise testing, multivariate analysis of 23 clinical and laboratory variables identified multiple thallium-201 defects as the best predictor of multivessel disease. The predictive accuracy of exercise-induced S-T segment depression was only 45 percent compared with 88 percent (p <0.05) for thallium-201 scintigraphy. Thus, 2 weeks after myocardial infarction, exercise thallium-201 scintigraphy is useful for predicting the extent and location of coronary artery disease, particularly stenoses in the left anterior descending and right coronary arteries. Moreover, thallium-201 imaging at rest is reliable in assessing the extent of coronary disease in hospitalized patients who cannot undergo exercise testing because of unstable angina, uncompensated heart failure, poorly controlled arrhythmias or physical limitations.

Improved efficiency of treadmill exercise testing using a multiple lead ECG system and basic hemodynamic exercise response.

One hundred consecutive men with a normal ECG at rest had a maximal treadmill test using 14 leads during and post-exercise. Coronary arteriography performed the following day revealed coronary stenoses greater than or equal to 70% in 66 patients. Test results obtained from a V5 lead were compared to different lead combinations and were correlated with arteriographic findings. A positive exercise test occurred in 37 men using an isolated V5 lead compared to 50 men (P less than 0.05) using 11 leads, 52 men (P less than 0.05) using a combined CM5, CC5, Cl (inferior) lead system and 58 (P less than 0.001) men using all 14 leads. The predictive value of a positive test varied between 89-95% and was not changed significantly by the addition of multiple leads. The 14 lead ECG was positive in 43/45 (96%) patients with multivessel disease. Parameters which helped to predict multivessel disease using 14 leads were 1) the time that ischemia first appeared 2) the pressure-rate product at the time ischemia first appeared, and 3) the maximum workload that could be attained. In general, the magnitude of ST-segment depression and the time required for a positive ECG to return to normal postexercise were not useful predictors of multivessel disease. We conclude that the use of multiple leads improves the sensitivity and efficiency of the maximal treadmill exercise test. The usefulness of exercise test results can be further improved if multiple leads are combined with physiologic data collected during exercise.