Chapter 15 Endocarditis 123 Sonography

Chapter 15 Endocarditis 123 Sonography Chapter 15 Endocarditis A 123 Sonography Approach Endocarditis an infection of the inner lining of the heart is a potentially lifethreatening condition requiring prompt diagnosis and management Transthoracic echocardiography TTE plays a crucial role in the evaluation of endocarditis providing invaluable information regarding the presence location size and morphology of vegetations as well as the assessment of valvular function and hemodynamics This chapter will present a structured approach to endocarditis sonography emphasizing key sonographic findings and their implications I Anatomy and Physiology A Cardiac Structures Valves The heart contains four valves mitral aortic tricuspid and pulmonary Endocarditis most commonly affects the mitral and aortic valves Endocardium The inner lining of the heart chambers responsible for maintaining smooth blood flow Chordae tendineae Fibrous cords that attach the valve leaflets to the papillary muscles ensuring proper valve closure Papillary muscles Muscular projections within the ventricles that support the chordae tendineae B Endocarditis Pathophysiology Infective Endocarditis Infection of the endocardium typically caused by bacteria or fungi NonInfective Endocarditis Less common and includes conditions like LibmanSacks endocarditis associated with systemic lupus erythematosus II Clinical Presentation Fever Fatigue Shortness of breath New murmur Embolic phenomena eg stroke transient ischemic attack peripheral emboli 2 Janeway lesions Painless redpurple spots on the palms and soles Osler nodes Tender red nodules on the fingertips and toes Roth spots Retinal hemorrhages with pale centers III Sonographic Examination A TTE Technique Transthoracic Views Utilize standard echocardiographic windows for comprehensive evaluation of all cardiac structures Transesophageal Echocardiography TEE May be necessary for better visualization of vegetations especially in patients with poor acoustic windows or complex anatomy B Sonographic Findings Vegetations The hallmark of endocarditis Location Valve leaflets Most common location Chordae tendineae May mimic vegetations Papillary muscles Less common Appearance Echogenic Bright dense reflecting sound waves well Hypoechoic Less echogenic with poor reflectivity Mobile May move with the blood flow Irregular May have irregular shapes and borders Size Typically small but can range from millimeters to centimeters Valve Abnormalities Valve regurgitation Blood leaks back through the valve Valve stenosis Narrowing of the valve opening obstructing blood flow Valve prolapse Leaflets prolapse into the chamber during systole Cardiac Function Left ventricular dysfunction Can occur secondary to infection or valvular abnormalities Pericardial effusion Fluid accumulation in the pericardial sac surrounding the heart Embolic Phenomena Stroke Cerebral embolism Peripheral embolism Embolism to extremities or other organs IV 123 Sonography Approach This approach provides a structured framework for systematically evaluating endocarditis 3 with TTE 1 Visualize the Valves Mitral Valve Utilize parasternal long and shortaxis apical fourchamber and apical two chamber views Aortic Valve Parasternal long axis and apical fourchamber views Tricuspid Valve Apical fourchamber and parasternal shortaxis views Pulmonary Valve Parasternal shortaxis and suprasternal views 2 Assess the Valve Morphology Valve Leaflet Thickness Increased thickness suggests inflammation Valve Leaflet Motion Limited or abnormal motion may indicate dysfunction Chordae Tendineae Examine for thickening or rupture 3 Evaluate for Vegetations Location Identify the exact valve leaflet or structure involved Size Measure the length and width of the vegetation Echogenicity Assess the echogenicity and appearance of the vegetation Mobility Observe the vegetations movement with the blood flow Attachments Determine if the vegetation is attached to the valve leaflet chordae tendineae or papillary muscle V Diagnostic Considerations Differential Diagnoses Other conditions can mimic the appearance of vegetations including Papillary muscle hypertrophy May appear similar to vegetations in the parasternal longaxis view Calcific nodules Benign usually immobile and have a characteristic popcorn appearance Thrombi Usually attached to the endocardium or valve leaflets often associated with atrial fibrillation or valve disease Limitations of Echocardiography Small vegetations May be difficult to visualize Acoustic shadowing Dense vegetations can obscure underlying structures Patient factors Poor acoustic windows obesity and lung disease can hinder visualization VI Management and Prognosis Antibiotics Essential for treating bacterial endocarditis Surgery May be necessary in cases of severe valve damage recurrent infections or resistant 4 organisms Prognosis Depends on the severity of the infection the affected valve and the presence of complications Early diagnosis and appropriate treatment significantly improve outcomes VII Conclusion Transthoracic echocardiography plays a crucial role in the diagnosis and management of endocarditis providing essential information regarding the presence size and location of vegetations as well as valvular function and hemodynamics By adopting a systematic 123 sonography approach clinicians can effectively evaluate patients with suspected endocarditis leading to timely intervention and improved outcomes