Endocarditis Flashcards
Strongest risk factor for infective endocarditis
Previous episode of endocarditis
Risk factors for IE
Rheumatic valve disease Prosthetic valves Congenital heart defects IVDU Recent piercings
Valve most commonly affected by IE
Mitral valve
Most common organisms that cause IE
Staph aureus(now most common, esp in IVDUs)
Strep viridans(historically most common)
Coagulase negative staph such as staph epidermis
What are IEs from strep viridans linked to
Poor dental hygiene or following a dental procedure
What are IEs from staph epidermis linked to
Staphylococcus epidermidis
commonly colonize indwelling lines and are the most cause of endocarditis in patients following prosthetic valve surgery, usually the result of perioperative contamination.
Non-infective causes of IE
systemic lupus erythematosus (Libman-Sacks)
malignancy: marantic endocarditis
Culture negative causes of IE
prior antibiotic therapy Coxiella burnetii Bartonella Brucella HACEK
What is HACEK
Haemophilus, Actinobacillus, Cardiobacterium, Eikenella, Kingella
Pathophys of IE
Endocardial injury → adherence of platelet and fibrin plug → circulating micro-organisms leads to secondary infection of plug → activation of coagulation cascade → adherence of more fibrin and platelets → growth of plug/vegetation
Symptoms of IE
Fever(90%) Chills Anorexia Weight loss Malaise Arthralgia Night sweats Abdominal pain
Signs of IE
Heart murmurs(usually only present in left-sided) Cutaneous manifestations Janeway lesions Osler nodes Roth spots
Cutaneous manifestations of IE
Petechiae on extremities or mucous membranes (30%) Splinter haemorrhages (reddish-brown linear lesion on the nail bed)
What are janeway lesions
non-tender macules on palms and soles, more associated with acute onset
What are Osler nodes
tender nodules on fingers and toes