- Acute rheumatic fever is an autoimmune disease that develops after a streptococcal infection. It can cause inflammation in joints, heart valves, brain, and skin.
- The document discusses the etiology, pathogenesis, clinical features, and management of acute rheumatic fever. It is caused by an immune reaction to a streptococcal infection that results in cross-reactivity with human tissues. Common symptoms include polyarthritis, carditis, chorea, and erythema marginatum.
- Diagnosis involves confirming a preceding streptococcal infection through elevated antibody titers as well as evidence of systemic inflammation from tests like ESR and CRP. Echocardiography and ECG can
Acute rheumatic fever is an auto immune disease, triggered by infection with specific strains of Streptococcus pyogenes, i.e. group A Streptococcus (GAS)
It affects the various organs like heart, joints, blood vessels , brain and connective tissues
Acute rheumatic fever is an auto immune disease, triggered by infection with specific strains of Streptococcus pyogenes, i.e. group A Streptococcus (GAS)
It affects the various organs like heart, joints, blood vessels , brain and connective tissues
Acute rheumatic fever-definition,pathophysiology,clinical presentation and ma...onlinefreelancer1
A detailed approach to ACUTE RHEUMATIC FEVER,based on Harrison Principles of internal medicine and Braunwald Textbook of Cardiology.Useful for post graduate seminars.
Rheumatic fever is an acute inflammatory disease, due to cross reaction of antibodies against GAS M protein, which resembles the proteins of heart, joints, brain and other connective tissues
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Acute rheumatic fever-definition,pathophysiology,clinical presentation and ma...onlinefreelancer1
A detailed approach to ACUTE RHEUMATIC FEVER,based on Harrison Principles of internal medicine and Braunwald Textbook of Cardiology.Useful for post graduate seminars.
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Standard Treatment Guidelines
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Luxor International Hospital,EGYPT
Tel: 00201113033672-00201012727282
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2. Definition
• “It is a multi system disease resulting from an autoimmune reaction to infection
with group A streptococcus.”
• Primary sites: Heart, joints, CNS
• Almost all of manifestation resolve completely, except cardiac valvular damage(RHD),which may persist
after other features have disappeared.
• Children 5-15 years and young adults
• RHD more common in females twice as frequently as in males
• Initial episodes –less common in old adolescent
• Recurrent episodes- seen in adolescents and young adults
• Prevalence of RHD peaks 25-40 years
• India, avg age of presentation 10-14 yrs
• Declined in Europe and North America
• Remains one of the most important cause of CVS mortality and morbidity in the developing countries.
3. Etiology
Develops after latent period 2-6 weeks after an episode of pharyngitis/tonsillitis by Group A beta
hemolytic Streptococcus
• M-serotypes (particularly types 1, 3, 5, 6, 14, 18, 19, 24, 27, and 29) were associated with ARF
• Pharyngitis- produced by GABHS can lead to- ARF,RHD & post strept. Glomerulonepritis
• Skin infection- produced by GABHS leads to post streptococcal glomerulo-nephritis only not
result in Rh.Fever or carditis as skin lipid cholesterol inhibit antigenicity Group A Beta Hemolytic
Streptococcus
• GENETICS
• Familial clustering of cases particularly for chorea
• monozygotic twins > dizygotic twins and heritability estimated at 60%.
• Some human leukocyte antigen (HLA) class II alleles, particularly HLA-DR7 and HLA-DR4,
associated with susceptibility
4.
5. B Lymphocytes produce
antibodies against
streptococcal antigens (mainly
M protein and
N-acetylglucosamine of group A
streptococcal carbohydrate)
antibodies cross react
with human tissues
because of antigenic
similarity-
cross-reactive antibodies
bind to endothelial cells on
the heart valve--
Autoimmune damage to heart
valves, subcutaneous tissues,
tendons, joints and basal ganglia of
brain
Pathogenesis = Molecular mimicry
6.
7. Clinical features
There is a latent period of ~3 weeks (1–5 weeks) between the precipitating group A
streptococcal infection and the appearance of the clinical features .
• The exceptions are chorea and indolent carditis, which may follow prolonged latent periods
lasting up to 6 months.
• Common Clinical features are
• polyarthritis (present in 60–75% of cases)
• carditis (50–75%).
• prevalence of chorea in ARF varies substantially between populations,
ranging from <2 to 30%
• Erythema marginatum
• subcutaneous nodules are now rare, being found in <5% of cases.
8. Heart Involvement
• 75% cases of ARF RHD
• Valvulitis- main lesion
• Characterised by oedema, cellular infiltration of the valve and chordae tendinae causing verrucae
formation and hyaline degeneration with subsequent regurgitant valves
• Eventual fibrosis and calcification leading to stenotic valves
• ACUTE PHASE
• Carditis as a major manifestation of ARF .
• Although carditis of ARF has been considered to be a pancarditis and can involve the endocardium,
myocardium and pericardium
• Rheumatic endocarditis may involve valvular (valvular endocarditis) or mural endocardium
• (mural endocarditis).
• Rheumatic pericarditis produces pericardial effusion and thick fibrinoserous exudates.
• Carditis leaves a sequelae and permanent damage to the organ (bites the heart).
• ARF = Licks the joints
9. • On microscopic examination, myocardium shows Aschoff body that is pathognomonic
of rheumatic myocarditis.
PATHOLOGY
• Basic change: in the form of fibrinoid degeneration of the collagen:
• - Aschoff cells- modified histiocytes and pathognomic for Rheumatic carditis
• Aschoff nodule is composed of Anitschkow cells with clear nuclei and with a central bar of chromatin-
resembling a caterpiller
• Central area of fibrin
• Central necrosis- surrounded by mononuclear cell infiltrate
• Myocardial fibres adjacent to the Aschoff body undergoes fibrinoid necrosis
10.
11. CHRONIC PHASE= VALVULAR DAMAGES
Valvular damage is the hallmark of RF.
Chronic phase is characterized by fibrosis, calcification, and stenosis of heart
valve=(fish-mouth valves)
• MC: Mitral valve with/without aortic valve
• Pulmonary / tricuspid involvement: usually secondary to increased
pulmonary pressure from Left side valvular disease
• Early will be regurgitation over yrs; leaflets thickening,scarring,
clacifications and valvular stenosis
• Clinical diagnosis based on the auscultation of typical murmurs that
indicate mitral or aortic valve regurgitation
12. Murmurs are most commonly observed during acute rheumatic fever.
1)Apical pansystolic murmur = high-pitched, blowing-quality murmur of
mitral regurgitation that radiates to the left axilla.
2). Apical soft mid-diastolic murmur (Carey Coombs murmur) =heard
during active carditis due to valvulitis with nodules forming on the mitral
valve leaflets.
It accompanies severe mitral insufficiency.
3). An early diastolic murmur of AR and is high-pitched, blowing,
decrescendo, and heard best along the right upper and mid-left sternal
border after deep expiration while the patient is leaning
13. • Subcutaneous nodules occur as
painless,small(0.5–2 cm), mobile lumps
beneath
the skin overlying bony prominences,
particularly of the hands, feet, elbows,
occiput, and occasionally the vertebrae.
• They are a delayed manifestation, appearing
2–3 weeks after the onset of disease, last
for just a few days up to 3 weeks, and are
commonly associated with carditis.
14. • JOINT INVOLVEMENT
Polyarthritis= inflammation, with hot, swollen, red, and/ or tender joints, and
involvement of more than one joint.
Polyarthritis is typically migratory moving from one joint to another over a period of
hours.
Affects the large joints—the knees, ankles, hips, and elbows—and is asymmetric.
Pain is severe and usually disabling until anti inflammatory medication is
commenced.
In some populations, aseptic monoarthritis ----result from early commencement of
anti-inflammatory medication before the typical migratory pattern is established.
The joint manifestations of ARF are highly responsive to salicylates and other (NSAIDs).
Joint involvement that persists for more than 1 or 2 days after starting salicylates is
unlikely to be due to ARF.
15. Skin manifestations
The classic rash of ARF is
Erythema marginatum
begins as pink macules that clear
centrally & leaving a serpiginous,
spreading edge.
The rash is evanescent, appearing
and disappearing before the
examiner’s eyes
It occurs usually on the trunk,
sometimes on the limbs, but
almost never on the face.
16. CHOREA Sydenham's chorea, Saint Vitus dance, St. Johannis chorea, chorea minor,
Definition: is a syndrome charactered by chorea, muscle weakness, and emotional instability
Commonly occurs in the absence of other manifestations, follows a prolonged latent period
after group A streptococcal infection, and is found mainly in females.
Head = Characteristic darting movements of the tongue, the upper limbs ---- may be
generalized or restricted to one side of the body (hemi-chorea).
Speech may be affected and may explosive and halting and fidgery
It is difficult to diagnose and following signs are helpful in these cases
Milkmaid's grip: When the patient is asked to squeeze the examiner's fingers, a squeezing
and relaxing motion (like milking a cow) occurs. This is described as milkmaid's grip and is
due to inability to maintain muscular contraction.
17. Jack in the box sign: When the patient is asked to keep the tongue protruded out, it retracts
involuntarily.
Pronator sign: Holding the arms outstretched may elicit "spooning" (hyperextension of the
fingers with dorsiflexion of the wrist).
Severe forms: Patients is unable to get up or sit, and has violent continuous jerks that may
cause physical injury.
Other features include hypotonia, pendular knee jerks, and mild generalized muscular
weakness
Associated emotional lability or obsessive-compulsive traits, which may last longer than the
choreiform movements (which usually resolve within 6 weeks but sometimes may take up to
6 months).
18. Laboratory Investigations
EVIDENCE OF A PRECEDING GROUP A STREPTOCOCCAL INFECTION With the exception of
chorea and low-grade carditis, both of which may become manifest many months(>2months)
later,
Because most cases do not have a positive throat swab culture or rapid antigen test, serologic
evidence is usually needed.
The most common serologic tests are the anti-streptolysin O (ASO) and anti-DNase B (ADB)
titers
Antistreptolysin O antibodies (ASO titers): Rising titers, or levels of >200 U (adults) or >300 U
(children). This test is positive in 80% of cases.
ASO titers are normal in 20% of adult cases of rheumatic fever
Anti-Dnase B
Antihyaluronidase (AH)
Antistreptozyme test (ASTZ) is a very sensitive indicator of recent streptococcal infection and
is also helpful ruling out rheumatic fever. Titers >200 units/ml considered positive.
19. • 2)Investigations for Evidence of a Systemic Illness (Nonspecific)
Acute phase reactants: These tests confirm the presence of an inflammatory
process, but are nonspecific.
Erythrocyte sedimentation rate (ESR) is raised.
Raised C-reactive protein (CRP) in the blood
Other tests confirming an inflammatory reaction:
Peripheral blood: Polymorphonuclear leukocytosis and anemia (due to
suppression of erythropoiesis)
Serum: Increase in serum complements, and increase in serum mucoproteins,
alpha 2 and y globulin levels
20. Investigations fpr Carditis
Chest radiography: Chest X-ray may show evidences of cardiac failure,
cardiomegaly, and pulmonary congestion.
ECG changes commonly include: prolongation of the PR interval and T-wave
inversion.
Other findings = second-degree AV block features of pericarditis and reduction in
QRS voltages.
Echocardiography: It can detect myocardial dysfunction, cardiac dilatation,
valvular abnormalities, and pericardial effusion.
21.
22. • Typical clinical features +
evidence of the
precipitating group A
streptococcal infection,
+exclusion of other
diagnoses.
• This uncertainty led Dr. T. Duckett
Jones in 1944 to develop a set of
criteria (subsequently known as
the Jones criteria) to aid in the
diagnosis.
23. TREATMENT
1) ANTIBIOTICS
To treat the precipitating group A streptococcal infection.
• Penicillin is the drug of choice and can be given orally
• 1)Phenoxymethyl penicillin, 500 mg [250 mg for children ≤27 kg] PO twice daily, or
• 2)Amoxicillin, 50 mg/kg [maximum, 1 g] daily, for 10 days or
• 3)IM benzathine penicillin G a single dose of 1.2 million units (600,000 units for children
≤27 kg ,1,200,000 FOR >27 KG
Management of Acute Rheumatic Fever
Step 1: Primary prevention -- eradication of streptococci.
Step 2 Anti-inflammatory treatment (aspirin, steroids
Step 3: Supportive management and management of complications
Step 4: Secondary prevention (prevention of recurrent attacks)
24. 2) SALICYLATES AND NSAIDS
These may be used for the treatment of arthritis, arthralgia, and fever, once the diagnosis
is confirmed.
• Aspirin is a common first-line choice, = 50–60 mg/kg per day, up to 80–100 mg/kg(HIGH
DOSE) per day (4–8 g/d in adults) in 4–5 divided doses.
• At higher doses, -- monitored for symptoms of salicylate toxicity such as nausea,
vomiting, or tinnitus; if symptoms appear, lower doses should be used.
• Naproxen = 10–20 mg/kg per day(safer than aspirin and has the advantage of twice-
daily dosing
Step 3: Supportive Management and Management of
Complications
• Bed rest is important, --- reduces joint pain and cardiac workload.
• Patients without carditis: Advice bed rest until temperature and ESR are normal
• Patients with carditis: Bed rest to be continued for 2-6 weeks after the ESR and
temperature has returned to normal. Avoid exercise in patients who had carditis
25. .
1. Treatment of congestive cardiac failure: Digitalis and diuretics
• Glucocorticoids
Use remains controversial
Prednisone or prednisolone at a dose of 1-2 mg/kg/ day maximum upto 3 weeks
•Bed rest
2. CHOREA
Milder cases = REST TO JOINTS , SUPPORTIVE SPLINTING
Severe chorea: carbamazepine or sodium valproate for 1-2 weeks
Recent evidence of corticosteroids being effective
Should be considered in severe or refractory cases
Prednisone at 0.5- 1 mg/kg/daily with weaning after 1 week
IV Immunoglobulin
More rapid resolution of chorea, but have shown no benefit on the short or long term
outcome of carditis in ARF without chorea
26. Step 4: Secondary Prevention of Rheumatic Fever (Prevention
of Recurrent Attacks)
directed at preventing acute group A B-hemolytic streptococcal (GABHS) pharyngitis in
patients at risk of recurrent acute rheumatic fever by long-term prophylaxis