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1、 Cardiomyopathy and myocarditisTang Qizhu:88041911-6604 :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 secondary. Primary cardiomyopathy can
2、t 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 causesClasification(1995 WHO/ISFC)Therearefourmaintypes:DilatedcardiomyopathyHypertrophiccardiomyopathyRestrictivecardiomyop
3、athyArrhythmogenicrightventriculardysplasiaDilated cardiomyopathy This type of cardiomyopathy is characterized by a dilatation and impaired contraction of the left or both ventricles ImportancesThe incidence and prevalence of cardiomyopathy appears to be increasing. The reported incidence is 0.013-0
4、.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 new onset of disease are younger than 2 yearsCAUSES Cardiomyopathies have many causes,
5、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, although it is suspected to be an end stage of myocarditis SYMPTOMS Symptoms often dev
6、elop 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 worsens, the heart may perform normally when a person is resting, but may cause symptoms d
7、uring 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 urination at nightirregular heartbeat (palpitations-a feeling of racing or skipping
8、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 also hear rales, or wet crackles, through a stethoscope, indicating fluid in th
9、e 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 notedInspection and palpationPalpate for heaves, shifted point of maximal impu
10、lse, 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. The apical impulse is normally within 10 cm of the midsternal line A
11、uscultationMurmurs (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 persons with DCMAbdomen and othersPercussion and palpation
12、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 DETECTION To confirm the diagnosis, the physician may order tests, including:Blood tests; Chest
13、 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 contractileDoppler Echo Marked dilation of the left ventricle with globa
14、l 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 ElectrocardiogramECG changes are usually nonspecificLow voltage comp
15、lexes 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 required (usually 4-8) Myocyte hypertrophy and fibrosis with
16、out lymphocytic infiltrate TREATMENTS 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 cardiomyopathy, and is essentially the same as the treatment of h
17、eart 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 Surgical Care A heart transplant may be considered if heart
18、 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 recommendations may be given, because these habits make symptom of dilated car
19、diomyopathy worse COMPLICATIONSCOMPLICATIONSCongestive heart failureCardiac arrhythmias, including lethal arrhythmiasPulmonary (lung) edemaTotal failure of the heart to function (circulatory collapse)Side effects of medications, including low blood pressure (hypotension), light headedness, fainting,
20、 lupus reaction, headache, GI upset, and digitalis toxicityHYPERTROPHIC CARDIOMYOPATHYHypertrophic cardiomyopathy is a primary cardiac disease characterized by an inappropriate myocardial hypertrophy, which occurs in the absence of an obvious hemodynamic load such as aortic stenosis or systemic hype
21、rtension HISTORY AND OTHER NAMESHypertrophic Cardiomyopathy was first recognised in the late 1950s. The condition has been known by a number of names including Hypertrophic Obstructive Cardiomyopathy (HOCM), Idiopathic Hypertrophic Sub-aortic Stenosis (IHSS) and Muscular Sub-aortic Stenosis. The gen
22、eral 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 either no evidence of inheritance or there is insufficient information about the individuals
23、 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 abnormalities in at least 6 related genes that are important in the development of heart musc
24、le 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 light chains. These are important proteins for the contraction of the heart pathol
25、ogyan 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 calcium ion concentration in the region of myofibrillar contractile proteins and dela
26、yed 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 cardiomyopathy manifest variable degree of LVOT obstruction. In some, the obstr
27、uction 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 Hypertrophy with ObstructionThe mechanism of LVOT obstructionThe thick upp
28、er 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 LVOT orifice size. Simultaneously, as a result of systolic anterior move
29、ment of the mitral valve (SAM), there is functional mitral regurgitationsymptom dyspnea:ShortnessofbreathExercisecapacitymaybelimitedbybreathlessnessandfatigueChestpainpainmayoccuratrestorduringsleepandmaypersistPalpitationSyncopy/dizzinessSuddendeathPHYSICAL EXAMINATIONThe systolic murmur is charac
30、teristically 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 valvular aortic stenosis, it does not radiate to the carotids. murmurThe intensity of the murmur can be varied by va
31、rious 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 Valsalvas maneuver. The murmur intensity can be diminished by increasing afterload (squatting), or by increasi
32、ng 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 aboveElectrocardiogram or ECGMain features include left ventricular hypertrophy (LVH) pattern and the presenc
33、e of prominent Q waves which resemble Q waves of myocardial infarction (pseudo-infarction pattern). Ambulatory electrocardiogram may reveal atrial and ventricular arrhythmias including non-sustained ventricular tachycardia (NSVT) Echocardiogram or ECHOinclude hypertrophic walls, ASH, and septal wall
34、 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 Doppler studies provide additional hemodynamic information Cardiac Catheterisationshows a gradient between the main left ventricular cha
35、mber and the subaortic chamber proximal to the obstruction. This pull back tracing differentiates obstructive hypertrophic cardiomyopathy from aortic stenosis Genetic testingGenetic testing may play an important role in helping doctors rule out other diagnoses. For example, in patients who have a sm
36、all increase in wall thickness (like trained athletes with ventricular hypertrophy), and some patients with constant high blood pressure who are thought to have HCMTREATMENT Drug TreatmentDrug treatment or medication is primarily given when a person has some or all of the symptoms described earlier
37、Alcohol Septal Ablation A catheterization 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 mov
38、ing a small amount of muscle from the ventricular wall Drug 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-Arrhyth
39、mic DrugsAnticoagulantsDiureticsAntibioticsDual 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
40、which 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
41、signs and/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 diagnosi
42、sThe diagnosis 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 meas
43、ure pressures and to 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 t
44、he disease. There is no 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 d
45、ysplasiaARVD is a rare type 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 s
46、tress. Studies have shown that 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 be
47、come disorganised and are replaced by fibrous and fatty tissue Patchy involvement of the right ventricle may lead to one or more sites of abnormal electrical activity SYMPTOMS of ARVCPalpitationlight-headednessfatigueblackout or collapse or syncopesymptoms of heart failureRHYTHM DISTURBANCESVentricu
48、lar ectopics (VE/VPB/VPC)Ventricular tachycardia (VT)Ventricular fibrillation (VF)Atrial fibrillation (AF)Sudden deathTREATMENT 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 theseDrug
49、treatment CardioversionAblationImplantable Cardioverter Defibrillator (ICD)myocarditisMyocarditis 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 most comm
50、on cause of myocarditis is infection of the heart muscle by a virus, Coxsackie B symptoms of myocarditisMyocarditis can be mild and cause virtually no noticeable symptoms. When it is more serious, it leads to weakening of the heart muscle. Myocarditis can then cause heart failure (with symptoms of s
51、hortness of breath, fatigue, fluid accumulation in the lungs, etc.) as well as heart rhythm irregularities from inflammation and/or scarring of the electrical system of the heart TreatmentExcept in systemic sarcoidosis and immune inflammation (such as from systemic lupus) where myocarditis can respond to corticosteroids, no proven effective medications are currently available for treating myocarditis. Current treatment of myocarditis mainly involves alleviating heart failure (salt restriction, water pills, ACE inhibitors, etc.) and treating as well as monitoring heart rhythm abnormalities
