Inflammatory Disorders of the Heart

1. Inflammatory Disorders of the Heart infection of endocardial surface of heart Endocarditis Pericarditis Myocarditis focal or diffuse inflammation of myocardium inflammation of pericardial sac (pericardium)

2. Endocarditis: precipitated by bacteria/fungal infection; potential death from emboli and valvular disturbance Myocarditis: virus, toxin or autoimmune response damage heart muscle > lead to cardiomyopathy and death! Pericarditis: Bacterial, fungal or viral infection affect visceral and parietal pericardium; restrict heart pumping action> lead to cardiac tamponade and death!

3. Layers of the Heart  Layers of heart muscle and pericardium; section of heart wall shows fibrous pericardium, parietal and visceral layers of serous pericardium (with pericardial sac between them), myocardium, and endocardium- Fig. 37-1

4. Layers of the Heart Muscle

5. TISSUES SURROUNDING THE HEART

6. Infective Endocarditis(Click to access YOUTube video) • Infection of inner layer of heart- usually affects cardiac valves • Was almost always fatal until development of penicillin • 15,000 cases diagnosed in US each year

7. A- Aortic Valve B- Mitral Valve C- Tricuspid Valve - Pulmonary Valve

8. A&P Review- Blood enters right atrium and moves through _______ into right ventricle. Blood then moves from right ventricle into pulmonary artery via _________. • After entering left atrium via pulmonary veins, blood moves through the _____ into left ventricle. • Finally, it travels through the _____ and out of heart A- Aortic Valve B- Mitral Valve C- Pulmonary Valve D- Tricuspid Valve A- Aortic Valve B- Mitral Valve C- Pulmonary Valve D- Tricuspid Valve

9. Risk Factors- endocarditis • Hx of rheumatic fever or damaged heart valve • Prior history of endocarditis • Invasive procedures- (introduce bacteria into blood stream) dental,gyne, etc. • Recent Dental Surgery • Permanent Central Venous Access • IV drug users • Valve replacements

10. Classification • Subacute form (subacute bacterial endocarditis-SBE) • Gradual onset; longer clinical course • Caused by enterococci • Usually those with damaged valves • Acute form • Shorter clinical course • Abrupt onset • Usually those with healthy valves • Usually caused by staph aureus • *Classify by cause as IVBA; prosthetic valve endocarditis (PVE), fungal endocarditis

11. Causative Organisms • Most common causative organism • Streptococcus viridans • Staphylococcus aureus • Viruses • Fungi

12. Etiology and Pathophysiology • Key -Blood turbulence within heart allows causative agent to infect previously damaged valves or other endothelial surfaces • Principal risk factors • Prior endocarditis • Prosthetic valves • Acquired valvular disease • Cardiac lesions

13. When valve damaged, blood > slowed down > forms clot. • Bacteria > into blood stream • Bacterial or fungal vegetative growths deposit on normal or abnormal heart valves • Infection of innermost layers of heart may occur in people with: • congenital and valvular heart disease • history of rheumatic heart disease • normal valves with increased amounts of bacteria

14. Endocarditis

15. Bacterial Endocarditis of Mitral Valve Bacterial endocarditis of mitral valve. Valve covered with large, irregular vegetations (note arrow). From text

16. Any valve can be affected!

17. Etiology and Pathophysiology • Vegetation • Fibrin, leukocytes, platelets, and microbes • Adhere to valve or endocardium • Embolization of portions of vegetation into circulation

18. Sequence of Events in Infective Endocarditis (view carefully) Fig. 37-3

19. Clinical Manifestations • Nonspecific • *Fever in 90% of patients • Chills • Weakness • Malaise • Fatigue • Anorexia • *Murmur

20. Clinical Manifestations • Subacute form • Arthralgias • Myalgias • Back pain • Abdominal discomfort • Weight loss • Headache • Clubbing of fingers

21. Clinical Manifestations • Vascular manifestations • Splinter hemorrhages in nail beds • Petechiae * most common • Osler’s nodes on fingers or toes *painful • Janeway’s lesions on palms or soles • Roth’s spots • *Murmur in most patients • Heart failure in up to 80% with aortic valve endocarditis • *Manifestations secondary to embolism

22. Sites of emboli due to infective endocarditis (AKA metastic infections)-site determined by location of original lesion

23. Osler’s nodes Janeway lesions Splinter hemorrhages Roth spots

24. Osler’s nodes- painful, red or purple pea-sized lesions on toes and fingertips • Splinter hemorrhages- black longitudinal streaks on nail beds • Janeway lesions-flat, painless, small, red spots on palms and soles • Roth spots- hemorrhagic retinal lesions

25. Diagnostic Studies • History • Recent dental, urologic, surgical, or gynecological procedures • Heart disease; onset *new heart murmur • Recent cardiac catheterization • Skin, respiratory, or urinary tract infection • Laboratory tests • Blood cultures (if temp above 101, typically do 2 sets) • WBC with differential • ESR, CRP • Echocardiography- TEE best- see vegetations • Chest x-ray 1) Vegetations on mitral valve 2) Vegetations on aortic Valce

26. Collaborative Care • Prophylactic treatment for patients having (see prevention) • Removal or drainage of infected tissue • Renal dialysis • Ventriculoatrial shunts • Antibiotic administration • Monitor antibiotic serum levels (peak & trough) • Subsequent blood cultures • Renal function monitored • BUN, Creatinine

27. Collaborative Care • Antibiotic therapy cont • IV for 2-8 weeks • *Maybe oral meds if not good candidate for IV and can identify and treat specific causative organism • Fungal and prosthetic valve endocarditis • Responds poorly to antibiotics • Valve replacement- adjunct procedure • Fever • Comfort with ASA, Ibuprofen etc

28. Collaborative Care • Surgical/Therapeutic/Nursing • Early valve replacement. • Complete bed rest –only if temp remains elevated or signs HF • Overall goals • normal or baseline cardiac function • performance of activities of daily living (ADLs) without fatigue • Antibiotic therapy cont

29. Nursing Diagnoses • Risk for Imbalanced Body Temperature-Hyperthermia • Risk for Ineffective Tissue Perfusion-emboli • Risk for decreased cardiac output • Ineffective Health Maintenance • Deficient knowledge

30. Complications • Emboli (50% incidence) • Right side- pulmonary emboli (esp. with IV drug abuse- Why??) • Left side-brain, spleen, heart, limbs,etc • CHF-check edema, rales, VS • Arrhythmias- A-fib • Death .

31. Collaborative Care • Priority Teaching • Signs/symptoms of life-threatening complications of IE, as cerebral emboli, HF etc. • Monitor fever (chronic or intermittent)- sign that drug therapy ineffective • Monitor lab data, blood cultures- determine effectiveness of antibiotic therapy • *Critical-prophylactic antibiotic therapy prior to ANY invasive procedure - see later slide)

32. Collaborative Care • Priority Teaching/nursing care • Stress need to avoid infectious people • Avoidance of stress and fatigue • Manage rest, hygiene, nutrition • Assessment of nonspecific manifestations • Monitor laboratory data • Monitor patency of IV • Teach reduction measures dec risk infection • Stress follow-up care

33. Collaborative Care • Eliminate risk factors • Patient teaching • Penicillin prophylaxis • Recent change Guidelines (not all require prophylaxis) • if prosthetic valve • History of endocarditis • Certain congenital heart defects • Heart transplant recipients- • Removal/drainageinfected tissue • Renal dialysis • Ventriculoatrial shunts • *see tab 37-3&4 • TABLE 37-3 SITUATIONS SeeREQUIRING ANTIBIOTIC PROPHYLAXIS TO PREVENT ENDOCARDITIS • Oral • Dental manipulation involving or periapical region of teeth • Dental manipulation involving perforation of oral mucosa • Dental extractions/dental implants • Prophylactic teeth cleaning with anticipated bleeding • Respiratory • Respiratory tract incisions (e.g., biopsy) • Tonsillectomy/adenoidect • GI/GU • Presence wound infection • Presence UTI

34. Risk Stratisfication for IE High Risk- • Mechanical prosthetic heart valve • Natural prosthetic heart valve • Prior infective endocardititis • Valve repair with prosthetic material • Most congenital heart diseases Moderate Risk- • Valve repair without prosthetic material • Hypertrophic cardiomyopathy • Mitral valve prolapse with regurgitation • Acquired valvular dysfunction Low Risk- • Innocent heart murmurs • Mitral valve prolapse without regurgitation • Coronary artery disease • People with pacemakers/ defibrillators • Prophylactic antibiotics are generally recommended only for people in the “High Risk” category

35. Pericarditis(Click to access YouTube video) • Pericarditis • inflammation of pericardium, thin, fluid-filled sac surrounding heart. • Can cause severe chest pain especially upon taking a deep breath) • Shortness of breath; hear pericardial friction rub.

36. Etiology/Pathophysiology • Pericarditis due to • Bacterial, fungal or viral infection infectious) • Non-infectious as uremia • Hypersensitive/autoimmune as Dresslers syndrome • Heart loses natural lubrication(10-15 ml serous fluid); layers roughen and rub • Inflammatory response>lymphatic fluid build-up- • if sudden > cardiac tamponade- • Pericardial Effusion- usually 250ml before show on x-ray-Can have 1000ml (danger!)

38. Pericardial Sac Anatomy-video

39. Fig. 37-4 Acute pericarditis. Note shaggy coat of fibers covering surface of heart.

40. Risk Factors/pericarditis • Be Acute or Chronic • Infectious, non-infections or hypersensitive/autoimmune causes • Acute-48=72 hrs post Mi or late-post MI (Dressler’s syndrome)-4-6 wks • Secondary to chemo and cancer • Secondary to uremia in renal failure-40-50% of pts will develop • Trauma or cardiac surgery • If chronic disorder-pericardium >rigid

41. Clinical Manifestations • Inflammation and pain • Pericardial friction rub-(click to hear) diaphragm at LL sternal, lean forward, listen at inspiration • Fever • Substernal, sharp, pleuritic chest pain • Inc. with coughing, breathing, turning, lying flat • Dec. with sitting up and leaning forward • Referred to trapezius muscle • Dyspnea

42. Complications of Pericarditis • Pericardial Effusion • Cardiac Tamponade

43. Pericardial Effusion(YouTubeVideo) • Can occur rapidly or slowly • Pulmonary compression-cough, dyspnea, and tachypnea • Phrenic nerve art sounds distant, muffled • *Slow build-up; no immediate effects; if rapid>compression of heart >tamponade!

45. Cardiac Tamponade • Compression of heart • Occur acutely (trauma) or sub-acutely (malignancy) • Symptoms- chest pain, confusion, anxious, ^ CVP, restless, muffled heart sounds • Later- tachypnea, tachycardia, and dec. CO, NVD and pulsus paradoxus • With slow onset dyspnea may be only symptom • If rapid compression-Medical Emergency

46. PERICARDIUM CARDIAC TAMPONADE Original heart size Excess pericardial fluid

47. Definition- a decrease in systolic BP with inspirations that is exaggerated in cardiac tamponade

49. Collaborative Care-Pericarditis, Pericardial Effusion, Cardiac Tamponde • Diagnostic Tests • Medications • Surgical/Therapeutic Interventions • Nursing Diagnosis/Interventions

50. Diagnostic Tests- to R/O • CBC-inc. WBC, ESR, and CRP • Cardiac Enzymes- inc. but not as much as with MI • *EKG- diffuse St elevation *important to different from MI changes (acute pericarditis) • Echo- for wall movement • CXR; Doppler imaginga • CT or MRI- for pericardial effusion • Pericardiocentesis fluid- determine cause; treat cardiac tamponade