Mechanical Complications after Myocardial Infarction: A Comprehensive Review

Mechanical complications of myocardial infarction are potentially fatal events that can occur after an acute myocardial infarction. While the introduction of primary percutaneous reperfusion and fibrinolysis has reduced the incidence of these complications to less than 1%. These complications pose significant hemodynamic consequences and necessitate prompt diagnosis. Echocardiography, cardiac magnetic resonance imaging, and computed tomography are valuable tools for establishing an accurate and expedited diagnosis. Consequently, it is imperative to conduct further scientific research to enhance hemodynamic stabilization techniques such as intra-aortic balloon counterpulsation and extracorporeal membrane oxygenation, in addition to exploring new surgical procedures that can reduce mortality resulting from mechanical complications. This article aims to provide a comprehensive review of mechanical complications following myocardial infarction and their correlation with multi-imaging, facilitating a better understanding of these complications.

Prognostic impact of body mass index on in-hospital bleeding complications after ST-segment elevation myocardial infarction

BACKGROUND ST-elevation myocardial infarction(STEMI)remains a major cause of mortality despite early revascularization and optimal medical therapy.Tailoring individual management by considering patients’specificities may help in improving post-STEMI survival.AIM To evaluate whether in-hospital bleeding complications may be involved in post STEMI prognosis among overweight patients.METHODS We prospectively included 2070 patients with a STEMI between January 2005 and December 2012 in the French observational cohort,“Registre d’Infarctus Maine-Anjou”.Bleeding Academic Research Consortium(BARC)in-hospital bleeding complications were recorded.RESULTS Of 705 patients(35.3%)were presented as being of normal weight,defined as a body mass index(BMI)<25 kg/m^2,877(43.9%)had a BMI between 25 and 30 kg/m^2and 416(20.8%)had a BMI≥30 kg/m^2.One-year cardiovascular mortality was lower for BMI≥25 kg/m^2(5.3%and 7.1%)patients than for normal weight patients(10.8%)(P=0.001).We found an interaction between the effect of BARC 3 on mortality and BMI groups.While a BARC 3 was related to a higher 1-year mortality in general(HR:2.58,95%CI:1.44-4.64,P≤0.001),prognosis was even worse in normal weight patients(HR:2.97,95%CI:1.61-5.5,P<0.001)than for patients with a BMI≥25 kg/m^2(HR:1.94,95%CI:1.02-3.69,P=0.041).CONCLUSION Normal weight patients presented higher rates of in-hospital bleeding complications and lower survival after a STEMI.Excess mortality might be due to greater vulnerability to bleeding amongst normal weight patients.

Clinical study of recombinant human brain natriuretic peptide in patients with acute myocardial infarction complicating congestive heart failure

Objectives To observe the efficacy and safety of recombinant human brain natriuretic peptide(rh-BNP) on patients with acute myocardial infarction complicating congestive heart failure.Methods 40 patients with acute myocardial infarction complicated by congestive heart failure were randomly divided into control group and treatment group of 20 cases.The control group,15 cases of acute anterior myocardial infarction,5 cases of acute inferior wall myocardial infarction, 15 males and 5 females,aged 55-70 years,mean age 58±12 years;treated 16 cases of acute anterior myocardial infarction,4 cases of acute myocardial infarction,16 males and 4 females,aged 56-70 years,mean age 59±11 years;two groups of age,gender,severity of disease and vascular lesions no significant difference and comparable(P】0.05).Conventional group were given aspirin,clopidogrel, statins,Inotropic,diuretic and vasodilator therapy.In the con- ventional treatment group based on the use of recombinant human brain natriuretic peptide(new bios,Tibet Pharmaceutical Co.,Ltd.Chengdu Nuodikang biopharmaceutical production, usage:1.5μg/Kg intravenous injection(impact), then 0.0075μg-0.01μg/(kg·min)infusion rate).Continuous medication 72 h.The clinical symptoms observed for 3 days in patients before treatment and after treatment,heart rate,blood pressure and left ventricular ejection fraction (LVEF) and tumor necrosis factor(TNF-α),brain natriuretic peptide(BNP) levels were measured.Results In control group,8 cases markedly effect,5 cases effect and 7 cases no effect,the total effective rate was 65%;In treatment group,13 cases markedly effect,6 cases effect and 1 cases no effect,the total effective rate was 95%,compared with two groups P New bios treatment group significantly increased cardiac index(CI) in patients with heart failure and left ventricular ejection fraction(LVEF) than the control group(all P【0.05),further reduce the levels of tumor necrosis (TNF-α) and brain natriuretic peptide(BNP).Conclusions rh-BNP can improve symptoms and heart function,reduced plasma tumor necrosis factor(TNF-α) and BNP levels of acute myocardial infarction patients with congestive heart failure,the treatment safe and reliable.As small sample size observed,larger sample to be accumulated to further evaluate its efficacy and safety.

St-Segment Elevation Myocardial Infarction with Multiple Complications: A Case Report

Introduction: ST-Segment Elevation Myocardial Infarction (STEMI) usually involves complete thrombotic occlusion of a coronary artery and require urgent reperfusion;it is one of the leading cause of global mortality and morbidity worldwide. A variety of mechanical, rhythmic, conductive, embolic or hemodynamic complications can occur following STEMI, especially when the treatment is delayed or inadequate. Clinical presentation: A 58-year-old patient with hypertension was admitted to our department for a circumferential STEMI complicated by an ischemic stroke;received 24 hours after the onset of pain. His blood pressure was 100/60 mmHg, heart rate was 55 beats/min. The examination revealed right central facial paralysis and a slight motor deficit of the right upper limb (muscle strength 4/5). The first electrocardiogram (ECG) showed a significant circumferential ST-segment elevation with Q waves in the same territory, as well as a Luchiani Wenckebach atrio-ven- tricular block. The first echocardiography performed showed apical akinesia along with the presence of an apical thrombus. Coronarography was not performed because it was not available and the patient was given curative low molecular weight heparin combined with dual antiplatelet therapy, an angiotensin converting enzyme inhibitor and high dose statins. Seventy-two hours later, the ECG showed a complete atrioventricular block with narrow QRS and the average ventricular rate was 51 beats/min. The patient was asymptomatic. Another echocardiography was performed to assess new complications and showed a rupture of the left ventricular wall and a moderate amount of circumferential pericardial effusion, without any sign of cavity compression. No particular therapeutic attitude was adopted apart from close monitoring with daily ECG and echocardiography. Ten days later, spontaneous regression of the AV Bloc was noted. Conclusion: ST-Segment Elevation Myocardial Infarction is a major cause of morbidity and mortality worldwide. A variety of complications can occur after myocardial infarction, especially when revascularisation is delayed or inadequate.

Combination of several rare complications of myocardial infarction in a single patient

There are three major mechanical complications of acute myocardial infarction: rupture of the left ventricular free wall, rupture of the interventricular septum, and development of mitral regurgitation. Each of these complications is associated with extremely high mortality. Reviewing the scientific literature, we found descriptions of sporadic cases of both of those complications combined. We report an unusual case of simultaneous rupture of free wall and interventricular septum.

Effect of recombinant human brain natriuretic peptide on serum inflammatory factors, neuroendocrine hormones and cardiac function in patients with acute myocardial infarction complicated with heart failure

Objective:To investigate the effect of recombinant human brain natriuretic peptide (BNP) on inflammatory factors, neuroendocrine hormones and cardiac function indexes in patients with acute myocardial infarction complicated with heart failure.Methods:A total of91 cases of acute myocardial infarction with heart failure patients were divided into the control group (n=44) and observation group (n=47) according to the random data table, two groups of patients were given conventional treatment, based on this, the control group was given intravenous infusion of Nitroglycerin Injection treatment, the observation group received intravenous injection of recombinant human brain natriuretic peptide treatment, compared serum inflammatory factors, neuroendocrine hormone and cardiac function and other indexes of two groups before and after treatment.Results: there was no significant difference between the two groups before treatment. After treatment, the levels of TNF-α, hs-CRP, IL-6, MCP-1, LVESD and LVEDD in the two groups were significantly lower than those within the group before treatment, and the observation group was significantly lower than the control group;The two groups after treatment LVEF levels were significantly higher than those in the group before treatment, and the observation group was significantly higher than that of control group;the observation group after treatment PRA, Ang II and ALD and NE levels were significantly lower than those before treatment, and was significantly lower than the control group after treatment, the difference was significant, PRA, Ang, ALD and NE levels of control group before and after the treatment was no significant difference.Conclusion:recombinant human brain natriuretic peptide in the treatment of acute myocardial infarction with heart failure can effectively reduce the serum inflammatory factors and neuroendocrine hormone levels, improve heart function, and have a certain clinical value.

Anxiety Network of Brain Function in Patients with Acute Cerebral Infarction

Objective: To explore the characteristics of brain functional network with anxiety in patients with acute cerebral infarction. Methods: A total of 39 patients with acute cerebral infarction by cranial magnetic resonance examination were included, and all the patients were scored by the Hamilton Anxiety Scale. The anxiety scale is scored by a professional psychiatrist. There are a total of 14 items, including anxiety, nervousness, fear, insomnia, cognitive function, depressed mood, somatic anxiety, sensory system, etc. The total score ≥ 29 points may be severe;≥21 points, there must be obvious;≥14 points, there must be anxiety;a score of more than 7 may indicate anxiety. If the score is less than 7, there are no anxiety symptoms. All patients within 24 to 72 hours, complete the head examination magnetic resonance, computerized calculation of the DWI sequence images, according to the results of the calculation to superimpose the image of the lesion, image reconstruction in space, and carry out Binarization, defining the value of lesions as 1, and the value of non as 0. All lesions are superimposed into one image and integrated. The relationship between the lesions in this superimposed image and anxiety after cerebral infarction was analyzed. Results: The lesions were basically concentrated around the lateral ventricle, and they were mainly concentrated around the lateral ventricle. Conclusion: Patients with acute cerebral infarction in the lateral ventricle or basal ganglia are more prone to post-stroke anxiety. This has a certain evaluation value for the prognosis of future cerebral infarction, and has a certain understanding of the exploration of complications, and has a certain understanding of the exploration of complications.

Silent brain infarctions and leuko-araiosis in Chinese patients with first-ever acute lacunar strokes

We report on silent brain infarction (SBI) and leuko- araiosis (LA) of 23 patients with clinically diagnosed “first-ever” acute ischemic lacunar stroke. The lacunar syndromes were pure motor hemiparesis (10), pure sensory syndrome (2), ataxic hemiparesis (3), dysarthria clumsy hand syndrome (3), and sensory- motor deficit (5). Nineteen out of the 23 patients presented with completed strokes on arrival to the hospital, and 4 (17%) developed evolving-stroke within 24 hours of stroke onset. A lacune corresponded to the acute stroke could be found in all patients on brain magnetic resonance imaging (MRI), and in 18 (78%) on brain computed tomography (CT). MRI showed additional subclinical or asymptomatic “silent brain infarctions or lacunes” (SBI) in 19 (83%) of 23 patients, and leuko-araiosis (LA) of moderate to severe degree (> grade 2) was present in 61% of patients although dementia was absent. Hypertension is the risk factor in 78% of cases followed by diabetes mellitus, smoking, and elevated plasma cholesterol level. Independence of the types of lacunar syndromes, patients with hypertension and diabetes mellitus are associated with high grade LA. None with normal blood pressure and plasma glucose had grade 3 or grade 4 LA (p < 0.05). In conclusion, evolving-stroke occurs in one- fifth of patients with “first-ever” lacunar infarct within the first 24 hours of stroke onset. SBI was found in 83% of cases. Hypertension and diabetes mellitus are associated with additional SBI and high grade LA. The severity of leuko-araiosis per se dictates the cerebrovascular risks.

Electro-Acupuncture for Treatment of Dysequillibrium Due to Cerebellum or Brain Stem Infarction

The authors treated 26 cases of dysequillibrium due tocerebellum or brain stem infarction byelectro-acupuncture from Aug 2000 - April 2002. Theresults were quite satisfactory and reported as follows.

Intramyocardial dissection with concomitant left ventricular aneurysm as a rare complication of myocardial infarction： a case report

We describe a rare case of a 60-year-old woman suffering from intramyocardial dissection and left ventricular aneurysm secondary to acute myocardial infarction. A rare form of ventricular septal rupture resulted from intramyocardial dissection deterioration, which was iden- tified during echocardiographic follow-up. Surgical repair under beating-heart cardiopulmonary bypass was successful.

Silent Cerebral Infarctions in Type II Diabetes Mellitus Patients;Could Brain MRI Be a Routine Investigation?

Objective: To study the prevalence of silent cerebral infarction in Type II diabetes mellitus. Patients and Methods: The study was a prospective on 80 patients recruited from neurology, endocrine outpatient clinics. Patients were type II diabetics as described by the American Diabetes Association, 2011 criteria. All patients underwent full metabolic profiles to diagnose diabetes mellitus and MRI brain scans to detect cerebral infarction. Results: Silent cerebral infarctions were detected in 60% of patients (48/80 patients) predominately along periventricular white matter area and subcortical areas (Basal ganglia, Thalamus). Conclusion: Asymptomatic Type II diabetes mellitus patients could have vascular cerebral changes without neurological symptoms. MRI brain scans could be recommended as routine diagnosis (if possible) for early cerebral infarct detection in type II diabetic patients.

Clinical Efficacy of Recombinant Brain Natriuretic Peptide in Patients with Acute Myocardial Infarction After On-Pump Coronary Artery Bypass Grafting (CABG)

Objective:To evaluate the clinical efficacy of intravenous recombinant human brain natriuretic peptide(rhBNP)in patients with acute myocardial infarction after on-pump coronary artery bypass grafting(CABG).Methods:40 cases of coronary heart disease,left ventricular ejection fraction<50%and(plasma brain natriuretic peptide in type N terminal)NT-proBNP>300 pg/ml underwent on-pump coronary artery bypass surgery with cardiopulmonary bypass were enrolled and randomly divided into two groups,experimental group of 20 patients after operation on the basis of conventional therapy plus recombinant human brain natriuretic peptide treatment(first loading dose of 1.5μg/kg intravenously,to maintain dose of 0.01μg/kg/min continuous infusion of 72h),20 cases of the control group was given routine treatment,observe two groups of patients before and after treatment of blood pressure,heart rate,urine volume,blood creatinine and NT-proBNP,and to observe the left ventricular ejection fraction(LVEF),echocardiography and the length of time the index.Results:the experimental group after treatment,urine volume,left ventricular ejection fraction(LVEF),cardiac index(CI)was significantly higher than that before treatment,the serum creatinine,plasma N-terminal pro brain natriuretic peptide(NTproBNP),the content of serum troponin T peptide(cT nT),creatine kinase isoenzyme(CK MB)was significantly lower than before treatment.Conclusion:Recombinant human brain natriuretic peptide can improve cardiac and renal function in patients with acute period of acute myocardial infarction underwent coronary artery bypass surgery,shorten the hospitalization time,and it is safe and feasible.

EFFECT OF ACUPUNCTURE ON β-EP CONTENT IN THE BRAIN TISSUE OF RATS WITH ACUTE CEREBRAL INFARCTION

Objective: To study the mechanisms of acupuncture in treatment of acute cerebral infarction. Methods: 90 SD rats were randomly divided into normal control group (n=10), model group (n=40) and electroacupuncture (EA) group (n=40). Shuigou (GV 26), bilateral Neiguan (PC 6) and Zusanli (ST 36) were stimulated with EA for 20 min. Acute cerebral infarction (ACI) was produced by blocking blood flow of the cerebral middle artery. Changes of β EP content in the brain tissue after ACI and EA were detected by radioimmunoassay (RIA). Results: 24 hour after ACI, plasma β EP content increased significantly to 1120.41±33.79 ng/L from 401.72±266.47 ng/L before ACL. While after acupuncutre, the increased β EP content lowered evidently in comparison with that of model group but was close to that of normal group. Conclusion: Acupuncture may adjust the neuroendocrine disturbance in rats with acute cerebral infarction to minimize the injury of the brain tissue.

Effect of DF-521 on functional recovery of nerve defect in patients with acute brain infarction

Objective To observe the effect of DF 521 on acute brain infarction and its’ safety.Method Patients were randomly divided into DF 521 group and control group.Neurological defect scoring were done before and after treatment.Clinical effect was evaluated.Result Total effective rate was more favorable in DF 521 group than that in control group(P<0.01).Conclusion DF 521 is effective in treating brain infarction without inducing significant adverse effects.

Effect of brain reflex instrument combined with acupuncture on convalescent neurotrophic status and nerve cell apoptosis in patients with cerebral infarction

Objective:To study the effect of brain reflex instrument combined with acupuncture on convalescent neurotrophic status and nerve cell apoptosis in patients with cerebral infarction. Methods:A total of 116 patients with convalescent cerebral infarction who were treated in Chinese Medicine Hospital Affiliated to Xinjiang Medical University between October 2014 and December 2016 were selected and randomly divided into two groups, intervention group received brain reflex instrument combined with acupuncture intervention + conventional intervention, and the control group only received conventional intervention. Serum levels of neurotrophic cytokines, monoamine neurotransmitter, and nerve cell apoptosis molecules were detected before intervention as well as 10, 20 and 30 d after intervention.Results:Serum BDNF, VEGF, bFGF, NE, E, 5-HIAA, DOPAC, HVA and Bcl-2 levels of both groups 10, 20 and 30 d after intervention were significantly higher than those before intervention while sFas, sFasL and sTRAIL levels were significantly lower than those before intervention, and serum BDNF, VEGF, bFGF, NE, E, 5-HIAA, DOPAC, HVA and Bcl-2 levels of intervention group 10, 20 and 30 d after intervention were significantly higher than those of control group while sFas, sFasL and sTRAIL levels were significantly lower than those of control group.Conclusions: Brain reflex instrument combined with acupuncture can significantly improve the convalescent neurotrophic status and nerve cell apoptosis in patients with cerebral infarction.

Rehabilitation and functional prognosis of acute brain infarct complicated with depression

Objective To observe rehabilitation and functional prognosis of patients suffered from brain infarction of acute phase complicated by depression. Method We selected 38 cases of acute brain infarct complicated with depression disorder as depression group, 40 cases of non-depression patient admitted at the same period were selected as non depression group.Antidepressants drugs administration and rehabilitation therapy were performed.We evaluated patients according to functional independence measure(FIM)of Chinese edition. HAMD grading comparison was carried out in depression group. Result Before treatment,two groups score nearly the same,compared with pretreatment. After treatment,patients in depression group and non depression group showed significant improvement esp non-depression group (P<0.01).11 cases with severe depression in the depression showed no changes in FIM score before and after treatment. Conclusion Compared with non-depression patients,functional recovery of patients with depression following brain infarction of acute stage is much slower,especially for patients with severe depression.

The influence of tirofiban on the troponin, brain natriuretic peptide, heart function in patients with Acute Myocardial Infarction after PCI

Objective:To observe the influence of tirofiban on the troponin, brain natriuretic peptide, heart function in patients with Acute Myocardial Infarction after PCI and provide scientific basis for treatment of acute myocardial infarction.Methods:A total of 100 cases of hypertensive cerebral hemorrhage patients in our hospital were selected and randomly divided into 2 groups: the control group (50 cases) and the observation group (50 cases). The conventional treatment of PCI was performed on both groups. Tirofiban injection was given to the observation group on the basis of conventional treatment. cTnI, BNP and echocardiography parameters (LVEF, LVEDD, LVESD) were detected before and after treatment.Results:The comparison of cTnI in the two groups before operation was not statistically significant. cTnI in the 2 groups increased 12 h and 24 h after operation. But the cTnI in observation group (0.10±0.23) ng/mL decreased more significantly than that in control group (0.24±0.31) ng/mL, the difference was considered to be statistically significant. The comparison of BNP in the two groups before operation was not statistically significant. BNP in the 2 groups decreased obviously 7 d and 30 d after operation. BNP in observation group decreased more significantly than that in control group and the difference was considered to be statistically significant LVEF in the observation group increased significantly compared with that in control group 7 d after operation. The comparison of LVEDD, LVESD were not considered to be statistically significant. LVEDD and LVESD in the observation group were lower than that in control group obviously 30 d after operation. While the LVEF in the observation group was still higher than that in the control group. The comparsion was considered to be statistically significant.Conclusion:Tirofiban can improve the troponin, brain natriuretic peptide, heart function in patients with Acute Myocardial Infarction after PCI. It can also decrease the heart injury as well as helping the recovery of heart function.

Influence of ginkgolide combined with edaravone on the brain function of elderly patients with acute cerebral infarction and its preventive effect on ischemia reperfusion injury

Objective: To explore the influence of ginkgolide combined with edaravone on the brain function of elderly patients with acute cerebral infarction and its preventive effect on ischemia reperfusion injury. Methods: A total of 126 patients with acute cerebral infarction who were treated in Dazhou Central Hospital between February 2016 and May 2017 were divided into the control group (n=67) and ginkgolide group (n=59) according to different therapies. Control group received routine intravenous thrombolysis + edaravone therapy, and ginkgolide group received routine intravenous thrombolysis + edaravone + ginkgolide therapy. The differences in brain function and nerve ischemia reperfusion injury extent were compared between the two groups. Results: At T1 and T2, serum nerve function indexes NT-proBNP and NSE levels of ginkgolide group were lower than those of control group whereas BDNF levels were higher than those of control group;serum inflammatory mediators MCP-1, NF-κB, CRP and TNF-α levels were lower than those of control group;serum apoptosis molecules caspase-3 and Bax levels were lower than those of control group whereas Bcl-2 levels were higher than those of control group. Conclusion: Ginkgolide combined with edaravone therapy on the basis of intravenous thrombolysis can effectively optimize the brain function and alleviate the ischemia reperfusion injury caused by inflammatory response and apoptosisis in elderly patients with acute cerebral infarction.

CONTRAST STUDY ON CT AND BA IN DIAGNOSIS OF PATIENTS WITH ATHEROTHROMBOTIC BRAIN INFARCTION

Objectives: To explore applied value on CT and BA in diagnosis of patients with athero-thrombotic brain infarction. Methods :CT and BA were examined in 246 patients with atherothrombotic brain infarction. Results:The different change of CT and BA were showed in 246 patients with atherothrombotic brain infarction. Conclusions: There were separately different advantage and shortcoming in CT and BA in diagnosis of atherothrombotic brain infarction. The value of clinical application of BA was important in diagnosis of atherothrombotic brain infarction.

Neuroprotective effect of ischemic preconditioning in focal cerebral infarction: relationship with upregulation of vascular endothelial growth factor

Neuroprotection by ischemic preconditioning has been confirmed by many studies, but the precise mechanism remains unclear. In the present study, we performed cerebral ischemic pre- conditioning in rats by simulating a transient ischemic attack twice （each a 20-minute occlusion of the middle cerebral artery） before inducing focal cerebral infarction （2 hour occlusion-reper- fusion in the same artery）. We also explored the mechanism underlying the neuroprotective effect of ischemic preconditioning. Seven days after ocdusion-reperfusion, tetrazolium chloride staining and immunohistochemistry revealed that the infarct volume was significantly smaller in the group that underwent preconditioning than in the model group. Furthermore, vascular endothelial growth factor immunoreactivity was considerably greater in the hippocampal CA3 region of preconditioned rats than model rats. Our results suggest that the protective effects of ischemic preconditioning on focal cerebral infarction are associated with upregulation of vascu- lar endothelial growth factor.