BACKGROUND: Left ventricular thrombus is a common complication after acute myocardial infarction. Methods and RESULTS: To Study the incidence of left ventricular thrombosis (LVT) after acute myocardial infarction, we performed serial two-dimensional echocardiography (2D-Echo) in 35 consecutive patients with acute myocardial infarction prospectively ; 10 patients had inferior wall myocardial infarction, 25 patients had anterior wall myocardial infarction. 2D-Echo was obtained within 3 days of acute myocardial infarction, at 4-10 days after symptom onset, and 2-4 weeks after symptom onset serially in each case. 19 out of 35 patients received thrombolytic therapy with urokinase. Left ventricular thrombi were identified in 9(25.7%) of the 35 study patients. The location of myocardial infarction was anterior and apical in all cases with left ventricular thrombi. The shape of thrombi was mural in 6 cases and protruding in 3 cases. The incidence of left ventricular thrombi in patients who received urokinase was not significantly different from that in patients who didn't(31.9% vs 18.8%,p=0.22). Wall motion score was significantly higher in patients who developed left ventricular thrombi than in patients who had no left ventricular thrombus(8.2+/-1.9 vs 5.8+/-2.6, p<0.005). All thrombi appeared within 10 days after myocardial infarction. CONCLUSIONS: Thus left ventricular thrombi develops within 10 days following myocardial infarction with large anterior and apical location. The thrombolysis therapy has no effect in the incidence of left ventricular thrombi in this study. But because of confounding effect of thrombolysis and location of myocardial infarction and extent of myocardial infarction, further investigation is needed.
Anterior Wall Myocardial Infarction ; Echocardiography ; Humans ; Incidence* ; Inferior Wall Myocardial Infarction ; Myocardial Infarction* ; Prospective Studies ; Thrombolytic Therapy ; Thrombosis* ; Urokinase-Type Plasminogen Activator

BACKGROUND: In acute myocardial infarction, left ventricular remodeling, which was influenced by infarct size, location, and patency of infarct related artery(IRA), is a important prognostic factor for chronic heart failure and survival. Recently, several reports suggested that patent IRA does not always mean true myocardial reperfusion, and myocardial contrast echocardiography(MCE) may be a useful tool for assessing infarct size and viability of infarcted myocardium. So, we investigated the association between the degree of myocardial reperfusion assessed by MCE and long term change of left ventricular volume in acute anterior wall myocardial infarction patients who had patent IRA. METHODS: The study population was consisted of 17 patients with first acute anterior wall myocardial infarction patients who had patent left anterior descending artery by thrombolytic therapy or rescue PTCA. MCE was done immediately after coronary angiography within two weeks of myocardial infarction onset and analyzed by semiquantitative method to get opacification index. For analysis of left ventricular ejection fraction, wall motion abnormality and left ventricular volume, echocardiogram was taken within 2 weeks of myocardial infarction oneset and 9 months later in each case. Wall motion abnormality was quantified as wall motion index. According to serial changes of left ventricular volume, patients were divided into two groups ; group 1(less than 10% increase of LV volume at follow-up compared to intial echocardiographic exam) and group 2(more than 10% increase of left ventricular volume). We compared the opacification index of infarcted myocardium, wall motion abnormality, and ejection fraction between the two groups. RESULTS: Initial left ventricular volume and ejection fraction were not different between group 1 and group 2, but the opacification index was lower and initial wall motion index higher in group 2 than group 1. Opacification index, wall motion index, ejection fraction and left ventricular volume were closely correlated in the whole cases. By multivariate ananlysis, opacification index was the only significant factor predicting left ventricular volume increment. CONCLUSION: Myocardial reperfusion, which is closely correlated with ejection fraction and wall motion abnormality, acts as a independent predictor of left ventricular dilatation after acute anterior wall myocardial infarction. This result suggests that assessment of microvascular integrity with myocardial contrast echocardiography may be a valuable indicator to predict long-term change of left ventricular volume, although this is suggestive result in a limited number of patients.
Anterior Wall Myocardial Infarction* ; Arteries ; Coronary Angiography ; Dilatation ; Echocardiography ; Follow-Up Studies ; Heart Failure ; Humans ; Myocardial Infarction ; Myocardial Reperfusion* ; Myocardium ; Stroke Volume ; Thrombolytic Therapy ; Ventricular Remodeling

Aged ; Angioplasty, Balloon, Coronary ; Anterior Wall Myocardial Infarction ; complications ; therapy ; Dextrocardia ; complications ; Female ; Humans ; Situs Inversus ; complications ; Stents

Objective To quantitatively evaluate the associations of infarct size, regional myocardial function examined by cardiac magnetic resonance feature tracking (CMR-FT) strain analysis with infarct location in patients with ST-segment elevation myocardial infarction (STEMI) treated by primary percutaneous coronary intervention.Methods Cardiac magnetic resonance images were retrospectively analyzed in 95 consecutive STEMI patients with successful reperfusion. The patients were divided into the anterior wall myocardial infarction (AWMI) and nonanterior wall myocardial infarction (NAWMI) groups. Infarct characteristics were assessed by late gadolinium enhancement. Global and regional strains and associated strain rates in the radial, circumferential and longitudinal directions were assessed by CMR-FT based on standard cine images. The associations of infarct size, regional myocardial function examined by CMR-FT strain analysis with infarct location in STEMI patients were evaluated by the Spearman or Pearsonmethod. Results There were 44 patients in the AWMI group and 51 in the NAWMI group. The extent of left ventricular enhanced mass was significantly larger in patients with AWMI compared with the NAWMI group (24.47±11.89, 21.06±12.08 %LV; t=3.928, P = 0.008). In infarct zone analysis, strains in the radial, circumferential and longitudinal directions were remarkably declined in the AWMI group compared with the NAWMI group (z=-20.873, -20.918, -10.357, all P < 0.001). The volume (end-systolic volume index), total enhanced mass and extent of enhanced mass of the left ventricular were correlated best with infarct zone strain in the AWMI group (all P < 0.001). Conclusion In STEMI patients treated by percutaneous coronary intervention, myocardial damage is more extensive and regional myocardial function in the infarct zone is lower in the AWMI group compared with the NAWMI group.
Humans ; Anterior Wall Myocardial Infarction/therapy* ; ST Elevation Myocardial Infarction/pathology* ; Contrast Media ; Retrospective Studies ; Ventricular Function, Left ; Magnetic Resonance Imaging, Cine/methods* ; Gadolinium ; Magnetic Resonance Imaging ; Myocardial Infarction/diagnostic imaging* ; Magnetic Resonance Spectroscopy ; Percutaneous Coronary Intervention ; Stroke Volume

INTRODUCTIONA retrospective case series of acute anterior myocardial infarction (MI) patients complicated by complete atrioventricular block (AVB) treated with acute percutaneous transluminal coronary angioplasty (PTCA).

CLINICAL PICTUREEight patients with anterior MI and complete AVB underwent acute PTCA between 2000 and 2005. Mean onset of complete AVB was 16.6 +/- 16.9 hours from chest pain onset.

TREATMENTAll patients underwent successful PTCA to the left anterior descending artery.

OUTCOMEComplete AVB resolved with PTCA in 88%; mean time of resolution was 89 +/- 144 minutes after revascularisation. One patient had permanent pacemaker implanted at Day 12 after developing an 8-second ventricular standstill during hospitalisation but not pacing-dependent on follow-up. The rhythm on discharge for the other surviving patients was normal sinus rhythm.

CONCLUSIONThis case series suggests that complete AVB complicating anterior MI is reversible with acute PTCA and survivors are not at increased risk of recurrent AVB. Nevertheless, this condition is associated with extensive myocardial damage and high mortality during the acute hospitalisation was not improved with correction of AVB with temporary pacing.

Adult ; Aged ; Angioplasty, Balloon, Coronary ; Anterior Wall Myocardial Infarction ; complications ; therapy ; Atrioventricular Block ; complications ; therapy ; Electrocardiography ; Female ; Humans ; Male ; Middle Aged ; Recovery of Function ; Retrospective Studies

Cardioprotective effect of fimasartan, a new angiotensin receptor blocker (ARB), was evaluated in a porcine model of acute myocardial infarction (MI). Fifty swine were randomized to group 1 (sham, n=10), group 2 (no angiotensin-converting enzyme inhibitor [ACEI] or ARB, n=10), group 3 (perindopril 2 mg daily, n=10), group 4 (valsartan 40 mg daily, n=10), or group 5 (fimasartan 30 mg daily, n=10). Acute MI was induced by occlusion of the left anterior descending artery for 50 min. Echocardiography, single photon emission computed tomography (SPECT), and F-18 fluorodeoxyglucose cardiac positron emission tomography (PET) were performed at baseline, 1 week, and 4 weeks. Iodine-123 meta-iodobenzylguanidine (MIBG) scan was done at 6 weeks for visualization of cardiac sympathetic activity. Left ventricular function and volumes at 4 weeks were similar between the 5 groups. No difference was observed in groups 2 to 5 in SPECT perfusion defect, matched and mismatched segments between SPECT and PET at 1 week and 4 weeks. MIBG scan showed similar uptake between the 5 groups. Pathologic analysis showed similar infarct size in groups 2 to 5. Infarct size reduction was not observed with use of fimasartan as well as other ACEI and ARB in a porcine model of acute MI.
3-Iodobenzylguanidine ; Angiotensin II Type 1 Receptor Blockers/therapeutic use ; Angiotensin Receptor Antagonists/*therapeutic use ; Angiotensin-Converting Enzyme Inhibitors/therapeutic use ; Animals ; Anterior Wall Myocardial Infarction/*drug therapy/physiopathology ; Biphenyl Compounds/*therapeutic use ; Cardiotonic Agents/*therapeutic use ; Disease Models, Animal ; Echocardiography ; Fluorodeoxyglucose F18 ; Perindopril/therapeutic use ; Positron-Emission Tomography ; Pyrimidines/*therapeutic use ; Random Allocation ; Swine ; Tetrazoles/*therapeutic use ; Tomography, Emission-Computed, Single-Photon ; Valsartan/therapeutic use ; Ventricular Function, Left/*physiology