Precordial ST Segment Depression Research Articles

Precordial ST Segment Depression on Admission Electrocardiogram as a Simple Noninvasive Tool for Predicting Coronary Artery Disease Complexity in Patients with Inferior Myocardial Infarction

Precordial ST Segment Depression on Admission Electrocardiogram
 as a Simple Noninvasive Tool for Predicting Coronary Artery Disease Complexity
 in Patients with Inferior Myocardial Infarction
 
 Jaya Suganti, Anggia Chairuddin Lubis, Abdullah Afif Siregar, Andika Sitepu, Cut Aryfa Andra,
 Ali Nafiah Nasution, Harris Hasan
 
 Department of Cardiology and Vascular Medicine, Faculty of Medicine University of Sumatera Utara, 
 Haji Adam Malik General Hospital, Medan, Indonesia
 
 
 Background: Whether a precordial ST segment depression (PSTD) is merely a benign electrical phenomena or a sign of multivessel coronary artery disease (MVCAD) in inferior myocardial infarction (MI) remains unclear. The objective of this study is to analyze the complexity of coronary artery disease (CAD) in inferior MI patients with PSTD and to investigate whether PSTD can be used as a predictor of MVCAD in inferior MI.
 Methods: Patients with inferior MI were divided into two groups based on the presence of PSTD on admission ECG and were compared based on the patient’s coronary artery complexities.
 Results: A total of 215 patients with inferior MI were found in this study period, with 102 patients meet the inclusion and exclusion criteria. Patients with PSTD had a higher incidence of MVCAD and SYNTAX score. Further analyzes showed PSTD on admission ECG was an independent predictor of MVCAD in inferior MI [45 (66%) vs 23 (34%); OR 4.097; 95% CI 1.638-10.247; p=0.003).
 Conclusion: In daily clinical practice, PSTD on admission ECG may serve as a simple noninvasive tool for predicting MVCAD or a more complex CAD in inferior MI.
 
 Keywords: Precordial ST Segment depression, inferior myocardial infarction, SYNTAX score

ST-segment depression in left precordial leads in electrocardiogram of patients with acute inferior myocardial infarction undergoing primary percutaneous coronary intervention.

BackgroundThe early identification of patients with acute inferior ST-segment elevation myocardial infarction (STEMI) with high risk features is particularly important. Acute inferior STEMI may be associated with ST-segment depression in the left precordial leads (V4–V6). This study assessed prognostic value of ST-segment depression in these left precordial leads during the admission of patients with acute inferior STEMI treated with primary percutaneous coronary intervention.MethodsThis retrospective study enrolled 1,374 patients with acute inferior STEMI who underwent primary percutaneous coronary angioplasty between March 2011 and June 2014. The patients were divided into two groups: one group (n = 687) with left precordial ST-segment depression and the other (n = 687) without such ST-segment changes.ResultsThe patients with left precordial ST-segment depression were older and had higher incidence of hypertension, diabetes mellitus, and higher levels of troponin. In-hospital mortality was higher in patients with left precordial ST-segment depression. Advanced coronary artery disease was more observed in these patients.ConclusionIn patients with acute inferior STEMI treated with primary coronary intervention, left precordial ST-segment depression during admission of ECG is associated with more advanced coronary artery disease, and worse in-hospital clinical outcomes.

CORONARY ARTERY DISEASE;

Objectives: To determine the frequency of multivessel coronary artery disease(CAD) in patients suffering from inferior wall acute myocardial infarction (AMI) having STsegment depression in anterior chest leads. Study Design: Cross Sectional Survey. Setting:Department of Cardiology, Faisalabad Institute of Cardiology, Faisalabad. Period: December2013 to June 2014. Materials and Methods: After fulfilling the inclusion criteria, 120 patientswith acute inferior wall MI were studied. Patients were divided in two groups. Group I includedpatients with ST segments depression in leads V1-V3 and Group II with ST segment depressionin leads V4-V6. Age of patients ranged from 25 to 70 years. Results: The mean age was52.5±10.5 years. As regards sex distribution, 100 patients were male, 54 in Group I and 46in Group II. There were 20 female patients, 11 in Group I and 9 in Group II. Thirty six (30%)patients were diabetic, 22(33.8%) in Group I and 14(25.5%) in Group II. Forty five (37.5%)patients were hypertensive. Fifty two (43.3%) patients were smokers. Forty three (35.8%)patients had family history of ischemic heart disease, 25(38.5%) in Group I and 18(32.7%) inGroup II. Thirty five (29.2%) had hyperlipidemia, 20 (30.8%) in Group I and 15(29.2%) in GroupII. All patients underwent coronary angiogram. Thirty eight (31.7%) patients had single vesseldisease, 29(44.6%) patients in Group I and 9(16.4%) in Group II. Forty three (35.8%) patientshad double vessel coronary artery disease, 23 patients (35.4%) in Group I and 20(36.4%) inGroup II. Thirty nine (32.5%) had three vessel coronary artery disease, 13 (20%) in Group I and26 (47.3%) in Group II. Eighty three (69.2%) patients had multivessel coronary artery disease37(56.8%) in Group I and 46 (83.6%) in Group II (p value <0.002). Conclusion: The presence ofprecordial ST depression during acute inferior wall myocardial correlates well with multivesselCAD. Precordial ST-segment depression in acute inferior wall MI is related to anterior injury dueto LAD stenosis and these patients tend to have more severe CAD.

Comparison of In-hospital Major Adverse Cardiovascular Events in Patients of Acute Inferior Myocardial Infarction With or Without Precordial ST Segment Depression

Background: The clinical implications of precordial ST segment depression (PSTD) during acute inferior myocardial infarction has been an area of debate, and still under investigation with conflicting results. Based on previous studies, the presence of PSTD defines a high risk subset of patients with acute inferior myocardial infarction due to a more extensive myocardial ischemia that lead to a higher incidence of major adverse cardiovascular events (MACE). Despite of these results, others still considered this ECG finding as a benign electrical phenomenon. The aim of this study is to compare the incidence of in-hospital MACE in patients of acute inferior myocardial infarction with or without PSTD and to know whether PSTD can be used as a predictor of in-hospital MACE in acute inferior myocardial infarction.Methods: A total of 96 acute inferior myocardial infarction patients admitted from December 2013-2015 at Cardiology Department of Haji Adam Malik General Hospital were retrospectively analyzed. Patients were divided into two groups based on the presence of PSTD on admission ECG. Bivariate and multivariate analyses were performed to study the association between PSTD and in-hospital MACE, p value<0.05 was considered statistically significant.Results: The bivariate analysis showed that in-hospital MACE was significantly higher in patients of acute inferior myocardial infarction with PSTD than without PSTD (92% vs 8%, p<0.001). On multiple logistic regression analysis, patients of acute inferior myocardial infarction with PSTD have a 5.4 fold increased risk of in-hospital MACE than patients without PSTD (OR 5.480; 95% CI 1.759-17.067, p=0.003).Conclusion: The presence of precordial ST segment depression on admission ECG in acute inferior myocardial infarction patients was associated with a higher in-hospital MACE and was an independent predictor of in-hospital MACE.

TCTAP C-059 Ostial Circumflex Stenting Through Left Main - LAD Stent: A Challenge of Access in Tortuous Complex Circumflex Anatomy

### Patient initials or identifier number VD ### Relevant clinical history and physical exam A 73 yr old lady presented with ACS.She had undergone Left main LAD cross over stenting as a salvage procedure for near cardiac arrest 2 yrs earlier. She had marked precordial ST segment depression and

A case of noncompaction at all segments of both right and left ventricles.

Background. Noncompaction/hypertrabeculation left ventricle (NCM/HVM) is most commonly reported in one or more segments of left ventricle and sometimes both ventricles. In this case, we present noncompaction of all segments of right and left ventricle, in a young man with mental retardation. Case Presentation. A 19-year-old male was referred to us with sudden dyspnea at rest and chest discomfort. He was a known case of mental retardation. He was born full term with birth weight = 1250 grams. On physical examination. A systolic murmur (II/VI) at left sternal border was heard. ECG showed increased voltage in precordial lead and deep ST segment depression. Chest X-ray (CXR) was within normal limits. Transthoracic echocardiography showed situs solitus, D loop, normal connection of great vessels, noncompaction LV at all segments (noncompaction/compaction = 2.5/0.5) with moderate systolic dysfunction (LVEF = 40%), diastolic dysfunction grade II, normal RV size with mild systolic dysfunction and hypertrabeculation, mild tricuspid regurgitation (TR), and normal pulmonary artery systolic pressure. After injection of agitated saline some bubbles were passed from right to left through patent foramen oval (PFO). Conclusions. Extensive sinusoid formation and trabeculation of RV and nearby all LV segments and its association with mental retardation suggest presence of strong genetic background.

Correlation of Angiographic Findings between Right (V1 to V3) versus left (V4 to V6) Precordial ST Segment Depression in Acute Inferior Myocardial Infarction

The initial ECG in patients with acute inferior MI may have a great value to identify the subgroup of patients who are at high risk by predicting multivessel coronary artery disease (CAD). These patients, therefore, may benefit from a more invasive approach. ST segment depression in leads V4 to V6 but not V1 to V3 confers a greater likelihood of multivessel CAD. The aim of the study to correlate between ST-depression in ECG on admission & severity of coronary lesion in angiogram in acute inferior MI. This study was undertaken in the department of cardiology of Bangabandhu Sheikh Mujib Medical University and in Ibrahim Cardiac Hospital & Research Institute from March 2009 to October 2010. Patients (total 93) of acute inferior MI, who were presented within 12hrs of onset of symptoms and got intravenous thrombolytics were divided into three groups after initial ECG, group A-without precordial ST-segment depression, group B- maximal precordial STsegment depression in leads V1–V3 and group C- maximal precordial ST-segment depression in leads V4– V6.CAG was done within six weeks of MI and findings of CAG were compared among the groups. Age, sex, distribution of risk factors were identical among the groups. Significant number (53.8%) of patients in group C had a lower ejection fraction (LVEF< 50%) than group B (30%) and group A (10.8%) (p=0.001). Patients of group C more often had double vessel disease (38.5% p=0.007) and triple vessel disease (30.8%) (p=0.014). In contrast, single vessel disease was more common in group B (80%) (p=0.001). Involvement of LAD was also significantly higher in group-C (73.1% p= 0.001). Left precordial ST depression (lead V4-V6) correlates with multivessel CAD, a trend toward a higher rate of LAD artery disease and is associate with LV dysfunction. DOI: http://dx.doi.org/10.3329/uhj.v7i2.10839 University Heart. Journal Vol. 7, No. 2, July 2011

Predictors and importance of congestive heart failure in patients with acute inferior myocardial infarction

Inferior myocardial infarction (MI) is considered to have a more favorable prognosis than anterior wall MI but includes high risk groups with increased mortality and morbidity. It is well known that congestive heart failure (CHF) complicating acute MI has poor prognosis. In this study we assessed the clinical and prognostic significance of CHF and the predictive value of the baseline demographic and clinical variables for CHF in patients with acute inferior MI. A total of 350 patients with acute inferior MI were included. In group A there were 26 patients (7.4%) with CHF, and in group B there were 324 patients (92.6%) without this complication. Baseline clinical and demographic characteristics and in-hospital complications of the groups were assessed. In group A patients were older (67.6±9.5 vs 53.7±10.9 years, p<0.0001) and there were more female patients (50% vs 15%, p<0.00001) compared to group B. The prevalence of diabetes mellitus (58% vs 16%) and precordial ST segment depression on admission ECG (81% vs 50%) were significantly higher in group A compared to group B (p<0.00001 and p=0.002 consecutively). In group A there was a higher rate of righ ventricular (25% vs 23%), posterior (26% vs 24%) and posterolateral myocardial infarction (19% vs 14%), but the differences were not statistically different. In group A patients had significantly higher rate of second- or third-degree AV block (46% vs 8%, p<0.00001), cardiogenic shock (35% vs 1%, p<0.00001) and mortality (46% vs 3%, p<0.00001) compared to group B. In a multivariate regression analysis diabetes mellitus (p=0.0003) and precordial ST segment depression on admission ECG (p=0.002) were found as the independent predictors of in-hospital CHF in patients with acute inferior MI. CHF and ST segment depression on admission ECG were found as the independent predictors of in-hospital mortality (p<0.00001, p=0.04 consecutively). Patients with CHF complicating acute inferior MI have more unfavorable demographic and clinical characteristics on admission, higher rate of in-hospital complications and mortality. History of diabetes mellitus and precordial ST segment depression on admission ECG have an independent predictive value for CHF in this particular group of patients.

The absence of the ST-segment elevation in acute coronary artery thrombosis: what does not fit, the patient or the explanation?

In a few patients with acute proximal thrombotic occlusion of the left anterior descending coronary artery (LAD), tall ischemic T waves never evolve into ST-segment elevation. This was recently inaccurately reported as a “novel sign” of proximal LAD occlusion. It has been speculated that the absence of ST-segment elevation could be attributed to the large area of transmural ischemia, the anatomic variant of Purkinje fibers, or to lack of activation of sarcolemal adenosine triphosphate–potassium channels. This electrocardiographic picture was recently explained by changes in the subendocardial but not in the epicardial action potential, suggesting subendocardial ischemia as the underlying mechanism. We present a patient with thrombotic lesion of proximal LAD, static precordial ST-segment depression, and tall T waves who underwent primary percutaneous intervention and stent placement. Surprisingly, total thrombotic stent occlusion on the following day was associated with ST-segment elevation in precordial leads, indeed supporting the concept of the regional subendocardial ischemia that was first described more than a decade ago.

Clinical Features and Outcome of Patients with Direct Percutaneous Coronary Intervention for Acute Myocardial Infarction Resulting from Left Circumflex Artery Occlusion

Little is known about the clinical features and outcome of patients with left circumflex artery (LCX) infarct-related acute myocardial infarction (AMI). This study was conducted to investigate the clinical features and outcome of patients who underwent direct percutaneous coronary intervention (d-PCI) for AMI caused by LCX occlusion, and to discover prognostic determinants in this clinical setting. Between May 1993 and October 2000, a total of 819 patients with AMI underwent d-PCI in our hospital. Sixty-seven patients (8.2%) who had LCX infarct-related AMI constituted the population of this study. Ten of 67 patients (14.9%) were in cardiogenic shock. Angiographic findings demonstrated that the incidences of triple-vessel disease, reference lumen diameter (RLD) of the LCX > or = 4.0 mm, and LCX as the dominant artery in these patients were 26.9%, 22.4%, and 34.3%, respectively. Sixteen patients (23.9%) had unsuccessful reperfusion (defined as Thrombolysis in Myocardial Infarction flow < or = 2). Univariate analysis showed that dominant LCX, RLD of the LCX > or = 4.0 mm, cardiogenic shock, precordial ST-segment depression, and complete atrioventricular block were significantly related to unsuccessful reperfusion. Multiple stepwise logistic regression analysis demonstrated that dominant LCX and cardiogenic shock were significant independent predictors of unsuccessful reperfusion. The 30-day mortality rate in the 67 patients was 14.9%. Univariate analysis demonstrated that triple-vessel disease, dominant LCX, cardiogenic shock, poor left ventricular ejection fraction, and unsuccessful reperfusion were significantly associated with 30-day mortality. By multiple stepwise logistic regression analysis, dominant LCX, cardiogenic shock, and triple-vessel disease were significant independent predictors of increased 30-day mortality. LCX infarct-related AMI has its unique clinical features. The presence of dominant LCX and cardiogenic shock were independent determinants of unsuccessful reperfusion, and the presence of dominant LCX, cardiogenic shock, and triple-vessel disease were independent determinants of increased 30-day mortality in this clinical setting.

The Diagnosis

The Diagnosis

Predictors and Importance of Congestive Heart Failure in Patients with Acute Inferior Myocardial Infarction

Inferior myocardial infarction (MI) is considered to have a more favorable prognosis than anterior wall MI but includes high risk groups with increased mortality and morbidity. It is well known that congestive heart failure (CHF) complicating acute MI has poor prognosis. In this study we assessed the clinical and prognostic significance of CHF and the predictive value of the baseline demographic and clinical variables for CHF in patients with acute inferior MI. A total of 350 patients with acute inferior MI were included. In group A there were 26 patients (7.4%) with CHF, and in group B there were 324 patients (92.6%) without this complication. Baseline clinical and demographic characteristics and in-hospital complications of the groups were assessed. In group A patients were older (67.6 ± 9.5 vs 53.7 ± 10.9 years, p < 0.0001) and there were more female patients (50% vs 15%, p < 0.00001) compared to group B. The prevalence of diabetes mellitus (58% vs 16%) and precordial ST segment depression on admission ECG (81% vs 50%) were significantly higher in group A compared to group B (p < 0.00001 and p=0.002 consecutively). In group A there was a higher rate of righ ventricular (25% vs 23%), posterior (26% vs 24%) and posterolateral myocardial infarction (19% vs 14%), but the differences were not statistically different. In group A patients had significantly higher rate of second- or third-degree AV block (46% vs 8%, p < 0.00001), cardiogenic shock (35% vs 1%, p < 0.00001) and mortality (46% vs 3%, p < 0.00001) compared to group B. In a multivariate regression analysis diabetes mellitus (p=0.0003) and precordial ST segment depression on admission ECG (p=0.002) were found as the independent predictors of in-hospital CHF in patients with acute inferior MI. CHF and ST segment depression on admission ECG were found as the independent predictors of in-hospital mortality (p < 0.00001, p=0.04 consecutively). Patients with CHF complicating acute inferior MI have more unfavorable demographic and clinical characteristics on admission, higher rate of in-hospital complications and mortality. History of diabetes mellitus and precordial ST segment depression on admission ECG have an independent predictive value for CHF in this particular group of patients.

Value of the initial electrocardiogram in assessing patients with inferior-wall acute myocardial infarction for prediction of multivessel coronary artery disease

Patients with inferior-wall acute myocardial infarction (AMI) who have ST-segment depression in the left precordial leads (LSTD+) on the initial electrocardiogram were reported to have more diffuse coronary artery disease (CAD) than had those without this finding (LSTD-). This suggests that LSTD+ patients may need extensive revascularization interventions more often than do LSTD- patients. However, this has not yet been confirmed. To compare the coronary angiographic findings and treatment strategies for patients with inferior-wall AMI according to the LSTD pattern. The clinical outcomes and the angiographic findings for 238 consecutive patients aged < or = 75 years who had been admitted to our hospital between 1 February 1995 and 1 February 1997 with inferior-wall AMI were retrospectively analyzed. The patients were divided into two groups according to the pattern of precordial ST-segment depression: LSTD+, ST-segment depression in leads V4-V6; and LSTD-, absence of this finding. All patients were treated according to current practice guidelines including with thrombolysis and revascularization interventions. The final study population included 217 patients; 83 were LSTD+ and 134 were LSTD-. All underwent coronary angiography within 30 days of the infarction. Compared with LSTD- patients, LSTD+ patients tended to be older (mean age 62.7 +/- 11.7 versus 58.3 +/- 9.6 years, P = 0.004), and had higher incidences of hypertension (39.8 versus 24.6%, P = 0.019) previous myocardial infarction (45.8 versus 20.1%, P = 0.0001) and congestive heart failure (21.7 versus 3.7%, P = 0.00008). Three-vessel CAD was much more common, and single-vessel CAD much less common, in the LSTD+ than in LSTD- group (62.7 versus 13.4% and 8.4 versus 50.7%, P < 0.00001 for both). Coronary-artery-bypass surgery and multivessel percutaneous coronary interventions (PCI) were used in treating 65.1% of the LSTD+ versus only 6.0% of the LSTD- patients (P < 0.00001), whereas single-vessel PCI was used in treating 71.6% of the LSTD- patients versus only 24.1% of the LSTD+ patients (P < 0.00001). Thus, the LSTD- pattern predicted single-vessel disease and single-vessel PCI only, whereas the LSTD+ pattern was predictive of multivessel CAD and of use of coronary-artery-bypass surgery or multivessel PCI (predictive values of 94.0 and 65.1%, respectively). Among patients with inferior-wall AMI, left precordial ST-segment depression predicts a very high prevalence of multivessel CAD and use of extensive revascularization interventions. The absence of this finding predicts nondiffuse CAD and lack of a need for extensive revascularization.

Are There Differences among Patients with Inferior Acute Myocardial Infarction with ST Depression in Leads V2 and V3 and Positive versus Negative T Waves in These Leads on Admission?

We assessed whether there are differences among patients with inferior acute myocardial infarction and ST segment depression in leads V2–V3 between those with positive versus negative T waves on admission. We found no differences in the prevalence of concomitant significant left anterior descending coronary artery stenosis and anterior or posterior wall motion abnormalities on echocardiography between the two groups. Precordial ST segment depression with negative T wave may be the early electrocardiographic pattern of posterior infarction, reflecting ST segment elevation with positive T waves that would have been detected by leads facing the posterior wall.

Clinical Significance of Precordial ST Segment Depression in Acute Inferior Myocardial Infarction

Background and Objectives:To evaluate the clinical and prognostic significance of precordial ST segment depression in precordial leads on admission electrocardiogram (ECG) in acute inferior myocardial infarction treated with intravenous thrombolytic therapy. We analysed about clinical and angiographic characters. Materials and Method:ECG findings in 50 patients with acute inferior myocardial infarction were retrospectively studied with results of coronary angiography and clinical informations. We classified all patients in two group according to the admissional ECG. Twenty nine patients (Group A) had no or <1.0 mm ST depression in precordial lead and Twenty one patients (Group B) had ≥1.0 mm ST depression in two or more precordial (V1-V6) leads were included in this group. Results:In precordial ST segment depression in acute inferior myocardial infarction patients had higher plasma peak mean CK levels (1945±1419 vs 3547± 2728 IU/L, p=0.027) and lower LV ejection fraction (62±10% vs 53±11%, p=0.008) and lower left ventricle global chordal shortening (0.89±0.71 vs -1.39±0.94, p=0.046) and inferior wall chordal shortening (-1.68±1.11 vs -2.43±0.74, p=0.014) and higher Killip class (1.3±0.8 vs 2.4±1.4, p=0.002) than without precordial ST segment depression patients. Conclusion:In conclusion acute inferior myocardial infarction with precordial ST depression patients had more extensive myocardial damage with global and inferior left ventricle severe wall motion dysfunction. Therefore, this suggests a worse prognosis in acute inferior myocardial infarction with precordial ST depression than without precordial ST depression patients. We need more aggressive diagnosis and treatment in this patients to prevent extending myocardial damage. (Korean Circulation J 1999;29(3):285-291)

Heart failure during first inferior acute myocardial infarction

Inferior acute myocardial infarctions (AMI) have better in-hospital prognosis than do anterior AMI. Authors of several studies reported that patients with inferior AMI complicated by atrioventricular block, concomitant precordial ST-segment depression and involvement of right ventricle have larger infarctions and a worse prognoses than do patients without these features. To analyse the incidence, clinical course and in-hospital prognosis of patients with heart failure and first inferior AMI. We analysed in 257 consecutive patients with first inferior AMI who had been admitted to the coronary care unit during January 1991 and March 1995. The clinical and electrocardiographic characteristics, as well as the morbidities and in-hospital mortalities, of groups of patients with and without heart failure during inferior AMI were compared. Symptoms and signs of heart failure were noted for 49 patients (19%). We found that patients who had suffered heart failure during inferior AMI were older (62.1 +/- 9.86 versus 58.78 +/- 10.58 years, P < 0.05) than those who had not suffered heart failure. There was no significant difference between patients' sex, history of diabetes mellitus, hypertension, smoking status, thrombolytic therapy, involvement of right ventricle and QRS score for these two groups. We found a greater prevalence of ST-segment depression (ST-segment depression > or = 1 mV in more than one precordial lead with maximal ST-segment depression in leads V4-V6) of V4-V6 precordial leads (57 versus 26%, P = 0.00002) and a lesser prevalence of no ST-segment depression (ST-segment depression < 0.1 mV in each precordial lead; 14 versus 38%, P = 0.001) among patients who had suffered heart failure. We found greater incidences of serious ventricular arrhythmias (53 versus 26, P = 0.0002) and ventricular tachycardiafibrillation (16 versus 7%, P = 0.03) among patients who had suffered heart failure than we did among those who had not. Third-degree atrioventricular block was more often found in patients who had suffered heart failure (23 versus 12%, P = 0.07) but this difference was not statistically significant. We found that the in-hospital mortality among patients who had suffered heart failure was much higher than that among those who had not (24.5 versus 3.8%, P = 0.000001). We found that heart failure occurs primarily in old patients, and in those with precordial ST-segment depression, especially in leads V4-V6. The patients who suffer heart failure have worse in-hospital prognosis due to serious ventricular arrhythmias and cardiogenic shock.

Correlation of angiographic findings and right (V 1 to V 3) versus left (V 4 to V 6) precordial ST-segment depression in inferior wall acute myocardial infarction

This study assessed whether differences in the underlying mechanisms for various patterns of precordial ST-segment depression with inferior acute myocardial infarction (AMI) are associated with poorer prognoses. We studied 1,155 patients with inferior AMI who underwent thrombolysis in the Global Utilization of Streptokinase and TPA for Occluded arteries (GUSTO-I) angiographic substudy: those without precordial ST depression (n = 412; 35.7%), those with maximum ST depression in leads V 1 to V 3 (n = 547; 47.4%), and those with maximum ST depression in leads V 4 to V 6 (n = 196; 17.0%) on admission electrocardiogram. We compared the infarct-related artery, presence of left anterior descending or multivessel coronary artery disease, and left ventricular function among groups. Patients with maximum ST depression in leads V 4 to V 6 more often had 3-vessel disease (26.0%) than those without precordial ST depression (13.5%) or those with ST depression in leads V 1 to V 3 (15.7%; p = 0.002), and they had a lower ejection fraction (median 54% vs 60% and 55%, respectively; p <0.001). Patients with maximum ST depression in leads V 1 to V 3 less often had AMIs due to proximal right coronary artery obstruction (23.9%) than patients without precordial ST depression (35.2%) or those with ST depression in leads V 4 to V 6 (40.0%; p = 0.001) and had larger AMIs as estimated by peak creatine kinase. Different patterns of precordial ST depression are associated with distinctive coronary anatomy. ST depression in leads V 4 to V 6, but not V 1 to V 3, confers a greater likelihood of multivessel coronary artery disease.

Effects of thrombolytic therapy in acute inferior myocardial infarction with or without right ventricular involvement

Objectives. This study assessed the prognostic impact of right ventricular involvement (RVI) in streptokinase-treated patients with inferior acute myocardial infarction (AMI) stratified for small or large AMI.Background. Only scant data exist from small studies about the impact of reperfusion therapy on survival in patients with RVI during inferior AMI.Methods. Right ventricular involvement was assessed by ST-segment elevation ≥0.1 mV in lead V4R and infarct size by the extent of ST-segment deviation on the baseline electrocardiogram: small AMI = sum ST-segment elevation ≤0.8 mV and no precordial ST-segment depression (small ST); large AMI = presence of precordial ST-segment depression or sum ST-segment elevation >0.8 mV (large ST) in 522 inferior AMI patients of the Hirudin for Improvement of Thrombolysis (HIT-4) Trial. In 187 patients, 90-min coronary angiography was performed.Results. Right ventricular involvement was present in 169 patients (32%). Higher 30-day cardiac mortality rates with RVI (5.9% vs. 2.5%) were related to larger infarct size rather than to RVI. For large ST, a proximal right coronary artery lesion was observed in 52% with and in 23% without RVI. Patency rates at 90 min were similar (54% vs. 52%). In the 28% of patients who had small ST, cardiac mortality was less than 1% irrespective of the presence of RVI. Coronary artery lesions were mostly located distally. Patency rates were 27% with and 80% without RVI.Conclusions. ST-segment elevation of ≥0.1 mV in V4R in inferior AMI patients is associated with larger infarct size and higher 30-day mortality rates. Right ventricular involvement is not an independent predictor of survival. In patients with small ST, cardiac mortality is low, even if ST V4R is ≥0.1 mV.

Precordial ST segment depression in inferior wall acute myocardial infarction: different angiographic finding between right (V1–V3) versus left (V4–V6) leads

Precordial ST segment depression in inferior wall acute myocardial infarction: different angiographic finding between right (V1–V3) versus left (V4–V6) leads

Atrial natriuretic peptide levels after different types of inferior wall myocardial infarction.

Atrial natriuretic peptide (ANP) is released from cardiac atrium secondary to increased atrial pressure. The plasma levels of ANP have been found to be related to short- and long-term prognosis after acute myocardial infarction (MI). The purpose of the present study was to investigate the plasma levels of ANP in three groups of patients with inferior wall acute MI classified according to ST-segment depression in the precordial leads. The study population consisted of 18 patients with inferior wall acute MI classified into three types: Type 1 = no precordial ST-segment depression (7 patients), Type 2 = sum of ST-segment depression in leads V1 to V3 equal to or more than the sum of ST-segment depression in leads V4 to V6 (4 patients), and Type 3 = maximal precordial ST-segment depression in leads V4 to V6 (7 patients). Radioimmunoassay showed that plasma ANP levels were significantly higher in patients with Type 3 acute inferior wall myocardial infarction compared with those with Types 1 and 2 (313.1 +/- 233, 73.0 +/- 27.5), and 84 +/- 32.7 pg/ml, respectively, p = 0.018). Plasma ANP levels are higher in patients with Type 3 acute inferior wall MI compared with patients with Types 1 and 2. These findings, together with earlier ones, may contribute to our understanding of the pathophysiology of the presence of ST-segment depression in the precordial leads in inferior wall acute MI.