心肌疾病(英文)精选课件.ppt

1、 Cardiomyopathy and myocarditisCardiomyopathy and myocarditisTang QizhuTel:88041911-6604 Email:qizhutyahooRenmin Hospital of Wuhan UniversityDifinitionCardiomyopathy is a serious disease in which the heart muscle becomes inflamed and doesnt work as well as it shouldIt can be classified as primary or

2、 secondary.Primary cardiomyopathy cant be attributed to a specific cause,such as high blood pressure,heart valve disease,artery diseases or congenital heart defects.Secondary cardiomyopathy is due to specific causesClasificationClasification(2019(2019 WHO/ISFC)WHO/ISFC)There are four main types:Dila

3、ted cardiomyopathyHypertrophic cardiomyopathyRestrictive cardiomyopathyArrhythmogenic right ventricular dysplasiaDilated cardiomyopathyDilated cardiomyopathy This type of cardiomyopathy is characterized by a dilatation and impaired contraction of the left or both ventricles ImportancesThe incidence

4、and prevalence of cardiomyopathy appears to be increasing.The reported incidence is 0.013-0.084%Cardiomyopathy is an important cause of morbidity and mortality among the worlds aging population Sex:men/women is 2.5/1 Age:All age groups are affected.However,studies suggest that 50%of patients with ne

5、w onset of disease are younger than 2 yearsCAUSESCAUSES Cardiomyopathies have many causes,including nutritional deficiencies,deposits in the heart muscle associated with medical conditions,anemia,stress,viral infections,alcoholism,coronary artery disease,and othersThere is no identifiable cause,alth

6、ough it is suspected to be an end stage of myocarditis SYMPTOMSSYMPTOMS Symptoms often develop gradually and usually include symptoms of right heart failure and/or left heart failureBecause the body compensates for dilated cardiomyopathy,the disease may have no symptoms initially.As the condition wo

7、rsens,the heart may perform normally when a person is resting,but may cause symptoms during periods of exercise or psychological stresssymptoms fatigue shortness of breath on exertion,orthopnea(breathing difficulty when lying down),waking up at night short of breath swelling of the anklesexcessive u

8、rination at nightirregular heartbeat(palpitations-a feeling of racing or skipping of the heart)decreased urine output(may not include at night)DIAGNOSISA physician diagnoses dilated cardiomyopathy after a physical examinationcheck for shortness of breath during exercise and weaknessThe physician may

9、 also hear rales,or wet crackles,through a stethoscope,indicating fluid in the lungsNeck and LungsJugular venous distention(as an estimate of central venous pressure)Hepatojugular refluxLarge cv wave(observed with tricuspid regurgitation)Crackles(pulmonary rales)Signs of pleural effusion may be note

10、dInspection and palpationPalpate for heaves,shifted point of maximal impulse,and cardiomegaly(broad and displaced point of maximal impulse,right ventricular heave).The normal apical impulse should be approximately the size of a quarter and should be located in one(fourth or fifth)intercostal space.T

11、he apical impulse is normally within 10 cm of the midsternal line AuscultationMurmurs(with appropriate maneuvers),tachycardia,S2 at the base(paradoxical splitting,prominent P2),S3,and S4 may be notedAn irregularly irregular rhythm(atrial fibrillation)may be notedGallops are almost always present in

12、persons with DCMAbdomen and othersPercussion and palpation of the liver may reveal hepatomegaly due to elevated venous pressure,infiltrative disease,hepatojugular reflux,or ascites Observe for cardiac cachexia,peripheral edema,cyanosis,and clubbingTESTS FOR DETECTIONTESTS FOR DETECTION To confirm th

13、e diagnosis,the physician may order tests,including:Blood tests;Chest x ray;Echocardiogram;Electrocardiography(ECG)Cardiac catheterization and angiography X-rayThis very large heart has a globoid shape because all of the chambers are dilated.It felt very flabby,and the myocardium was poorly contract

14、ileDoppler Echo Marked dilation of the left ventricle with global hypokinesia is the hallmark of the disease.Left ventricular ejection fraction 50%.Left ventricular walls are thin and areas of dyskinesis may be observed.The left atrium is also dilated.varying degrees of mitral regurgitation Electroc

15、ardiogramECG changes are usually nonspecificLow voltage complexes Presence of Q waves and inversion of T waves in leads I,II,aVL,and V4 through V6(anterolateral infarction pattern)Significant arrhythmia Myocardial biopsy The number of biopsy specimens collected should be limited to the minimum requi

16、red(usually 4-8)Myocyte hypertrophy and fibrosis without lymphocytic infiltrate TREATMENTSTREATMENTS Hospitalization may be required of patients when symptoms of dilated cardiomyopathy are severe.Treatment for dilated cardiomyopathy is focused on relief of symptoms,just as is for other types of card

17、iomyopathy,and is essentially the same as the treatment of heart failure Medications Medications may include digitalis,Angiotensin converting enzyme(ACE)inhibitors,Anticoagulants,Beta-blockers,Calcium channel blockers,Vasodilators,diuretics,nutritional supplements,or other cardiac medications Surgic

18、al CareSurgical Care A heart transplant may be considered if heart function is very poorDiet and others A low-salt diet may be recommended to patients and fluid intake may be restricted in some cases.Physical activity may be restricted as symptoms progress Smoking and alcohol cessation recommendatio

19、ns may be given,because these habits make symptom of dilated cardiomyopathy worse COMPLICATIONSCOMPLICATIONSCongestive heart failureCardiac arrhythmias,including lethal arrhythmiasPulmonary(lung)edemaTotal failure of the heart to function(circulatory collapse)Side effects of medications,including lo

20、w blood pressure(hypotension),light headedness,fainting,lupus reaction,headache,GI upset,and digitalis toxicityHYPERTROPHIC HYPERTROPHIC CARDIOMYOPATHYCARDIOMYOPATHYHypertrophic cardiomyopathy is a primary cardiac disease characterized by an inappropriate myocardial hypertrophy,which occurs in the a

21、bsence of an obvious hemodynamic load such as aortic stenosis or systemic hypertension HISTORY AND OTHER HISTORY AND OTHER NAMESNAMESHypertrophic Cardiomyopathy was first recognised in the late 1950s.The condition has been known by a number of names including Hypertrophic Obstructive Cardiomyopathy(

22、HOCM),Idiopathic Hypertrophic Sub-aortic Stenosis(IHSS)and Muscular Sub-aortic Stenosis.The general term Hypertrophic Cardiomyopathy(HCM)is now most widely used THE CAUSEThe cause of Hypertrophic Cardiomyopathy is not yet known.In the majority of cases the condition is inherited.In others there is e

23、ither no evidence of inheritance or there is insufficient information about the individuals family to assess inheritance.In affected families the condition usually passes from one generation to the next and generations are not skipped A Family TreeNEW DISCOVERIES Recently research has identified abn

24、ormalities in at least 6 related genes that are important in the development of heart muscle cells.In approximately 50-60%of families,affected individuals are found to have a mutation in the gene for myosin,troponin T,alpha tropomyosin,cardiac myosin binding protein-C,or the essential and regulatory

25、 light chains.These are important proteins for the contraction of the heart pathologyan excessive thickening of the muscle.Abnormal myocardial fiber arrangement which interferes with the proper diastolic sequence of relaxation.Abnormal myocardial calcium ion handling resulting in high cellular calci

26、um ion concentration in the region of myofibrillar contractile proteins and delayed re-uptake of calcium ion by the sarcoplasmic reticulum resulting in prolonged relaxation.Ischemia.Myocardial fibrosisLEFT VENTRICULAR OUTFLOW TRACT(LVOT)OBSTRUCTION Approximately 25%of patients with hypertrophic card

27、iomyopathy manifest variable degree of LVOT obstruction.In some,the obstruction or gradient is absent at rest but this can be provoked by exercise or other physiologic or pharmacologic means mechanism of LVOT obstruction Asymmetric Septal Hypertrophy mechanism of LVOT obstruction Asymmetric Septal H

28、ypertrophy with ObstructionThe mechanism of LVOT obstructionThe thick upper septum protrudes in the LVOT reducing the orifice size.Blood flowing through this narrowed LVOT causes a Venturi(suction)effect which draws the anterior leaflet of the mitral valve towards the septum,further reducing the LVO

29、T orifice size.Simultaneously,as a result of systolic anterior movement of the mitral valve(SAM),there is functional mitral regurgitationsymptom dyspnea:Shortness of breath Exercise capacity may be limited by breathlessness and fatigue Chest pain pain may occur at rest or during sleep and may persis

30、t PalpitationSyncopy/dizziness Sudden deathPHYSICAL EXAMINATIONPHYSICAL EXAMINATIONThe systolic murmur is characteristically crescendo-decrescendo and starts a little after the onset of S1.It is best heard at the left lower sternal border and radiates to the base,but unlike systolic murmur of valvul

31、ar aortic stenosis,it does not radiate to the carotids.murmurThe intensity of the murmur can be varied by various physiologic and pharmacologic interventions.Tthe murmur(and gradient)can be intensified by decreasing preload(decrease venous return)by abrupt assumption of upright posture or by Valsalv

32、as maneuver.The murmur intensity can be diminished by increasing afterload(squatting),or by increasing preload(leg raising in supine position)The murmur of mitral regurgitation is prominent in the apical region and shows the same directional changes in response to the interventions noted aboveElectr

33、ocardiogram or ECGElectrocardiogram or ECGMain features include left ventricular hypertrophy(LVH)pattern and the presence of prominent Q waves which resemble Q waves of myocardial infarction(pseudo-infarction pattern).Ambulatory electrocardiogram may reveal atrial and ventricular arrhythmias includi

34、ng non-sustained ventricular tachycardia(NSVT)Echocardiogram or ECHOEchocardiogram or ECHOinclude hypertrophic walls,ASH,and septal wall to posterior wall ratio of 1.3:1.In patients with HOCM,there is presence of SAM.Left ventricular chamber is normal or small;left atrium may be enlarged.Color Doppl

35、er studies provide additional hemodynamic information Cardiac CatheterisationCardiac Catheterisationshows a gradient between the main left ventricular chamber and the subaortic chamber proximal to the obstruction.This pull back tracing differentiates obstructive hypertrophic cardiomyopathy from aort

36、ic stenosis Genetic testingGenetic testing may play an important role in helping doctors rule out other diagnoses.For example,in patients who have a small increase in wall thickness(like trained athletes with ventricular hypertrophy),and some patients with constant high blood pressure who are though

37、t to have HCMTREATMENTTREATMENT Drug TreatmentDrug treatment or medication is primarily given when a Drug treatment or medication is primarily given when a person has some or all of the symptoms described earlierperson has some or all of the symptoms described earlier Alcohol Septal Ablation A cathe

38、terization is performed,alcohol is injected into the septum through a small coronary artery.This causes a controlled myocardial infarction Pacemaker dual chambered pacing would relieve obstruction,eliminate most symptoms and thin the walls of the heart Surgeryre moving a small amount of muscle from

39、the ventricular wall Drug TreatmentDrug TreatmentBeta-Blockers These drugs reduce heart rate,decrease myocardial contractility,prolong diastolic filling time and possess anti-arrhythmic properties especially against exercise-induced arrhythmias Calcium Antagonists Anti-Arrhythmic DrugsAnticoagulants

40、DiureticsAntibioticsDual Chamber PacemakerDual Chamber PacemakerIt is believed that pacemaker therapy alters the sequence of contraction which reduces LVOT gradient and improves symptoms Long term benefits,however,are questionable Restrictive cardiomyopathyIt is a disorder of the heart muscle in whi

41、ch the walls of the ventricles become stiff,but not necessarily thickened,such that they resist normal filling with blood.There is no cure.Treatment aims to ameliorate symptoms caused by the backup of blood into the lungs and veins of the neck and liver SymptomsPatients with RCM present with signs a

42、nd/or symptoms of heart failure such as fatigue,shortness of breath,tissue swelling(oedema)and abdominal enlargement Up to a third of patients may present with an embolic complication.Abnormal heart rhythms and palpitations are common whatever the underlying cause of the disease diagnosisThe diagnos

43、is of RCM is usually based a physical examination,an electrocardiogram(ECG)and an echocardiogram.Magnetic resonance imaging(MRI)can provide additional information about the structure of the heart.In some patients a precise diagnosis may require catheterisation of the heart to measure pressures and t

44、o perform a biopsy of the heart muscle(removal and microscopic examination of a specimen),which may enable the doctor to identify the infiltrating substance TreatmentAs the onset of symptoms in RCM is often very insidious,the diagnosis of RCM may be made late in the course of the disease.There is no

45、 specific treatment for RCM,and the aims of medical therapy are to improve symptoms of heart failure,treat cardiac rhythm disturbance and to prevent thromboembolism.Pacemakers are indicated for patients with slow heart rates or heart block Arrhythmogenic right ventricular dysplasiaARVD is a rare typ

46、e of cardiomyopathy in which the muscle tissue in the lower-right chamber of the heart(right ventricle)dies.The dead muscle tissue is replaced by fatPatients can develop dangerous arrhythmias or even go into cardiac arrest,particularly when under physical or emotional stress.Studies have shown that

47、ARVD is a significant cause of sudden cardiac death among young athletes Names Arrhythmogenic Right Ventricular Cardiomyopathy(ARVC)Even though this disease has been recognised only recently,These are not formal guidelines for assessment or treatment Muscle cells become disorganised and are replaced

48、 by fibrous and fatty tissue Patchy involvement of the right ventricle may lead to one or more sites of abnormal electrical activity SYMPTOMS of ARVCSYMPTOMS of ARVCPalpitationlight-headednessfatigueblackout or collapse or syncopesymptoms of heart failureRHYTHM RHYTHM DISTURBANCESDISTURBANCESVentric

49、ular ectopics(VE/VPB/VPC)Ventricular tachycardia(VT)Ventricular fibrillation(VF)Atrial fibrillation(AF)Sudden deathTREATMENTTREATMENT At present there is no cure for ARVC.Clinical management aims to identity people at risk of complications and then to use prophylactic therapy to try to prevent these

50、Drug treatment CardioversionAblationImplantable Cardioverter Defibrillator(ICD)myocarditismyocarditisMyocarditis is inflammation of heart muscleMyocarditis can be caused by a variety of conditions such as a virus,sarcoidosis,and immune diseases(such as systemic lupus,etc.),pregnancy,and others.The m