Endocarditis Flashcards

1
Q

Strongest risk factor for infective endocarditis

A

Previous episode of endocarditis

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2
Q

Risk factors for IE

A
Rheumatic valve disease 
Prosthetic valves 
Congenital heart defects 
IVDU 
Recent piercings
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3
Q

Valve most commonly affected by IE

A

Mitral valve

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4
Q

Most common organisms that cause IE

A

Staph aureus(now most common, esp in IVDUs)

Strep viridans(historically most common)

Coagulase negative staph such as staph epidermis

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5
Q

What are IEs from strep viridans linked to

A

Poor dental hygiene or following a dental procedure

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6
Q

What are IEs from staph epidermis linked to

A

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.

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7
Q

Non-infective causes of IE

A

systemic lupus erythematosus (Libman-Sacks)

malignancy: marantic endocarditis

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8
Q

Culture negative causes of IE

A
prior antibiotic therapy
Coxiella burnetii
Bartonella
Brucella
HACEK
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9
Q

What is HACEK

A

Haemophilus, Actinobacillus, Cardiobacterium, Eikenella, Kingella

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10
Q

Pathophys of IE

A

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

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11
Q

Symptoms of IE

A
Fever(90%)  
Chills 
Anorexia 
Weight loss 
Malaise 
Arthralgia 
Night sweats 
Abdominal pain
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12
Q

Signs of IE

A
Heart murmurs(usually only present in left-sided) 
Cutaneous manifestations 
Janeway lesions 
Osler nodes 
Roth spots
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13
Q

Cutaneous manifestations of IE

A
Petechiae on extremities or mucous membranes (30%)
Splinter haemorrhages (reddish-brown linear lesion on the nail bed)
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14
Q

What are janeway lesions

A

non-tender macules on palms and soles, more associated with acute onset

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15
Q

What are Osler nodes

A

tender nodules on fingers and toes

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16
Q

What are Roth spots

A

haemorrhagic retinal lesions with a pale centre

17
Q

Poor prognostic factors for IE

A

Staphylococcus aureus infection
Prosthetic valve (especially ‘early’, acquired during surgery)
Culture negative endocarditis
Low complement levels

18
Q

Indications for surgery in IE

A

severe valvular incompetence
aortic abscess
infections resistant to antibiotics/fungal infections
cardiac failure
recurrent emboli after antibiotic therapy

19
Q

What can indicate an aortic abscess in IE

A

often indicated by a lengthening PR interval

20
Q

Suggested antibiotic therapy in native valve IE

A

Amoxicillin

21
Q

Suggested antibiotic in IE caused by staph

A

Flucloxacillin

22
Q

Suggested antibiotic in IE caused by fully-sensitive strep

A

Benzylpencillin

23
Q

Criteria used to diagnose IE

A

Modified Duke criteria

24
Q

Major criteria for IE diagnosis

A

Positive blood cultures

Evidence of endocardial involvement(Echo, new valvular regurg)

25
Q

Blood culture recommendation for IE

A

At least 3 samples from different sites over 30-60 mins is recommended.

Adequate blood culture samples must be taken before starting any antibiotics, regardless of the clinical decision to start empirical antibiotics or to delay treatment.

26
Q

First line imaging ix for IE

A

Transthoracic echo usually

Transoesophageal echo has a higher sensitivity and is preferred if available

27
Q

Cardiac complications of IE

A

Valvular insufficiency, if left untreated, leading to congestive heart failure is the most common

Pericarditis

Perivalvular abscess

28
Q

Complications of IE from metastatic infection

A

Embolisation (which can lead to infarction and subsequent damage to various peripheral tissues)
Metastatic abscess formation
Mycotic aneurysms

29
Q

Type of complications - right-sided vs left sided IE

A

Systemic emboli affecting the brain, kidneys, spleen, and other soft tissues commonly occurs in left sided IE whereas pulmonary emboli most commonly occur in right sided IE.

30
Q

Pulmonary complications of IE

A

Septic pulmonary emboli (75% of cases with right sided IE) can manifest as pulmonary infarction or can lead to to a pulmonary infection, abscesses, pleural effusion, and empyema.

31
Q

neurological complications of IE

A

Neurological complications (40%) (including embolic stroke, intracerebral haemorrhage, cerebral abscess, meningitis, encephalopathy, seizures)

32
Q

Renal complications of IE

A

The most common renal complications include renal infarction, abscess (which are both secondary to septic embolisation) can present with isolating clinical features eg. costovertebral angle tenderness or with acute renal failure.

33
Q

MSK complications of IE

A

Vertebral osteomyelitis
Septic arthritis
Psoas abscess

34
Q

Causes of myocarditis

A
Viral - coxsackie B, HIV
Bacterial - diphtheria 
Lyme disease 
Toxoplasmosis 
Autoimmune
35
Q

Which drug is associated with myocarditis

A

Doxorubicin

36
Q

Presentation of myocarditis

A

usually young patient with an acute history
chest pain
dyspnoea
arrhythmias

37
Q

ECG changes in myocarditis

A

tachycardia
arrhythmias
ST/T wave changes including ST-segment elevation and T wave inversio

38
Q

Mx of myocarditis

A

treatment of underlying cause e.g. antibiotics if bacterial cause

supportive treatment e.g. of heart failure or arrhythmias

39
Q

Complications of myocarditis

A

heart failure
arrhythmia, possibly leading to sudden death
dilated cardiomyopathy: usually a late complication