Rheumatic Heart Disease (RHD): Global Burden, Symptoms, Diagnosis, Treatment, and Prevention
Why Can a Simple Sore Throat Damage the Heart?
Rheumatic Heart Disease: Global Burden, Symptoms, Diagnosis, Treatment and Prevention
⏱ In 30 Seconds
- ✓ Rheumatic heart disease can develop after acute rheumatic fever, an abnormal immune reaction that may follow infection with Group A Streptococcus.
- ✓ The disease affects more than 40 million people worldwide and causes hundreds of thousands of deaths each year.
- ✓ Early disease may cause no symptoms, but progressive valve damage can lead to breathlessness, fatigue, swelling and an irregular heartbeat.
- ✓ Echocardiography is the most important tool for detecting and monitoring heart-valve damage.
- ✓ Early treatment of streptococcal infections and long-term penicillin prophylaxis can prevent recurrent rheumatic fever and reduce further valve injury.
A Personal Note
I spent several years studying the immune response behind acute rheumatic fever. Before I became involved in this research, I had not fully appreciated that an infection as common as Group A Streptococcus could, in some people, eventually lead to permanent damage to the heart valves.
That work also made me much more aware of the continuing burden of rheumatic heart disease in Aboriginal and Torres Strait Islander communities in Australia. It is one of the reasons I wanted to write this overview of the disease, from its global burden and prevention to the immunology behind it.
Most sore throats disappear within days. But infection with Group A Streptococcus, or GAS, can occasionally trigger an immune reaction that continues after the bacteria have gone.
This illness is called acute rheumatic fever, or ARF. Repeated or severe episodes can inflame and scar the heart valves, eventually causing rheumatic heart disease, or RHD.
Much of this disease is preventable, yet RHD continues to affect children and young adults in communities where overcrowded housing, delayed diagnosis, limited healthcare access and recurrent streptococcal infection remain common.
Global Burden of Rheumatic Heart Disease
Rheumatic heart disease remains an important cause of preventable cardiovascular illness and death, particularly in low- and middle-income countries.
More than 40 million people are estimated to be living with RHD worldwide, and the disease causes over 300,000 deaths each year.
The burden is greatest in disadvantaged populations where access to early diagnosis, antibiotics, echocardiography and specialist cardiac care is limited.
RHD in Aboriginal and Torres Strait Islander Communities
Aboriginal and Torres Strait Islander peoples experience some of the highest documented rates of acute rheumatic fever and rheumatic heart disease in the developed world.
The greatest burden is concentrated in remote communities across the Northern Territory, the Kimberley region of Western Australia, Far North Queensland and northern South Australia.
This unequal burden is shaped by interconnected factors including overcrowded housing, repeated exposure to GAS, barriers to healthcare and difficulties maintaining long-term preventive treatment.
What Are the Symptoms of Rheumatic Heart Disease?
Symptoms depend on which valves are affected and how much damage has occurred.
Early RHD may cause few or no symptoms. As valve narrowing or leakage progresses, people may experience:
- Shortness of breath, especially during exercise
- Fatigue or reduced exercise capacity
- Chest discomfort
- Swelling of the legs, feet or abdomen
- A rapid or irregular heartbeat
- Dizziness or fainting in advanced disease
Children and young adults may first notice that they cannot keep up with normal physical activity.
Because valve damage can remain silent for years, relying on symptoms alone may delay diagnosis.
How Is Rheumatic Heart Disease Diagnosed?
Diagnosis combines medical history, physical examination and cardiac imaging.
Echocardiography
An echocardiogram, or heart ultrasound, is the most important test for detecting RHD.
It can show valve thickening, narrowing, leakage and changes in heart size or pumping function.
In high-risk communities, echocardiographic screening may detect early valve abnormalities before symptoms appear.
Medical History and Examination
Doctors ask about previous episodes of acute rheumatic fever, recurrent GAS infections, breathlessness, fatigue and other signs of valve disease.
A heart murmur may suggest abnormal blood flow across a damaged valve, although mild disease may not produce an obvious murmur.
Blood Tests and Other Investigations
Blood tests may provide evidence of recent streptococcal infection or active inflammation.
Depending on the clinical situation, doctors may also use an electrocardiogram, chest X-ray or additional cardiac tests.
How Is Rheumatic Heart Disease Treated?
Treatment depends on the severity of valve damage, the presence of symptoms and whether recurrent rheumatic fever remains a risk.
Long-Term Antibiotic Prophylaxis
People with a history of acute rheumatic fever are often prescribed regular penicillin to prevent further GAS infections.
Preventing recurrent rheumatic fever is one of the most effective ways to reduce additional valve damage.
Medicines for Heart Symptoms
When valve disease causes heart failure or fluid retention, medicines may be used to reduce swelling, ease breathlessness, control blood pressure or manage an abnormal heart rhythm.
Valve Repair or Replacement
Severe valve narrowing or leakage may require surgery.
Whenever possible, surgeons may repair the damaged valve. In other cases, the valve must be replaced with a mechanical or biological prosthetic valve.
Ongoing Follow-Up
Regular medical review and repeat echocardiography help determine whether the disease is stable or progressing.
Long-term follow-up is particularly important because significant valve damage can develop before symptoms become severe.
Can Rheumatic Heart Disease Be Prevented?
Yes. Prevention is central to reducing the global burden of RHD.
Primary Prevention
Prompt diagnosis and appropriate antibiotic treatment of GAS infections can reduce the risk that an infection will progress to acute rheumatic fever.
Secondary Prevention
People who have experienced ARF may require long-term penicillin prophylaxis to prevent recurrent episodes.
Each recurrence can cause additional inflammation and increase the risk of permanent valve damage.
Improving Living Conditions and Healthcare Access
Antibiotics alone cannot eliminate RHD.
Effective prevention also requires accessible primary healthcare, reliable follow-up, community education, reduced household overcrowding and stronger health services in high-risk regions.
Why Do Only Some People Develop Rheumatic Heart Disease?
This remains one of the central unanswered questions in rheumatic fever research.
Millions of people experience GAS infections, yet only a small proportion develop acute rheumatic fever.
Among those who develop ARF, not everyone progresses to severe rheumatic heart disease.
Scientists believe that several factors interact.
- Genetic susceptibility may influence how strongly the immune system responds to GAS.
- Molecular mimicry may cause immune responses against bacterial proteins to cross-react with human tissues.
- Repeated infections may reactivate and amplify inflammation.
- Immune regulation may fail to switch off the response after the infection has cleared.
- Social and environmental conditions influence exposure, diagnosis and access to preventive treatment.
Research at WEHI and elsewhere has investigated how inflammatory signals may help sustain this abnormal immune response.
One study identified a dysregulated pathway involving IL-1β and GM-CSF-producing CD4 T cells in people with acute rheumatic fever.
These findings do not replace the molecular-mimicry explanation.
Instead, they may help explain why inflammation becomes unusually strong or persistent in some individuals.
Understanding these pathways could eventually support treatments that prevent immune-mediated heart injury rather than focusing only on infection prevention.
Why This Still Matters
Rheumatic heart disease remains largely preventable, yet it continues to cause lifelong heart-valve damage in communities where repeated GAS infection and barriers to healthcare remain common.
Prevention depends on early diagnosis and antibiotic treatment, long-term follow-up and better access to healthcare. At the same time, research into the immune response may help explain why only a small proportion of people exposed to GAS go on to develop ARF and RHD.
The challenge is therefore not only to prevent recurrent infection, but also to understand what happens to the immune response after the bacteria have disappeared.
Continue Reading
- How Australian Scientists Discovered a New Immune Pathway in Rheumatic Heart Disease?
- From Life-Saving Discovery to Drug Target: The Story of GM-CSF
- Jacques Miller and T for Thymus: The Last Organ to Give Up Its Secret
- Peter Doherty: What Is MHC Restriction? The 1996 Nobel Prize Explained
This article is intended for general educational purposes and does not replace individual medical advice. Anyone concerned about symptoms, streptococcal infection or rheumatic fever should seek assessment from a qualified healthcare professional.
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