Rheumatic heart disease (RHD) is a chronic condition characterized by permanent damage to the heart valves, resulting from one or more episodes of acute rheumatic fever (ARF). The underlying process begins weeks after an untreated or inadequately treated throat infection caused by Group A Streptococcus bacteria. Instead of a direct bacterial invasion of the heart, the immune system mounts an inflammatory response against the bacteria. Due to molecular mimicry, these antibodies mistakenly attack the body's own healthy tissues, particularly the collagen found in heart valves, joints, and the central nervous system. Over time, repeated immune attacks cause the valve leaflets to become inflamed, scarred, and thickened, permanently altering their structure and function.
Not every sore throat leads to acute rheumatic fever. The chain of events typically starts with a streptococcal pharyngitis—commonly known as strep throat—primarily affecting school-aged children between 5 and 15 years old. If a patient does not receive a full course of antibiotics, such as benzathine penicillin G, the bacteria persist and trigger a systemic autoimmune reaction two to four weeks later. Recognizing and treating streptococcal sore throats promptly with antibiotics breaks this chain before acute rheumatic fever can develop. In many primary healthcare settings across Nigeria, differentiating viral sore throats from bacterial strep throat remains a clinical challenge, making careful history-taking and physical examination vital.
The inflammatory process of acute rheumatic fever, known as carditis, targets the endocardium, myocardium, and pericardium. The mitral valve is affected most frequently, followed by the aortic valve. Repeated inflammatory episodes lead to two main mechanical dysfunctions:
Over decades, these combined lesions increase hemodynamic strain on the heart chambers, eventually leading to atrial enlargement, pulmonary hypertension, and heart failure.
Patients with established rheumatic heart disease present differently depending on the severity of valve damage and the stage of the illness. Early in the disease process, individuals might remain completely asymptomatic. As valve narrowing or leaking worsens, symptoms of decreased cardiac output and fluid overload appear.
Common clinical presentations include exertional dyspnea (shortness of breath during physical activity), orthopnea, fatigue, and palpitations due to underlying atrial fibrillation. In advanced cases, patients may exhibit signs of right-sided heart failure such as pedal edema, hepatomegaly, and raised jugular venous pressure. Auscultation often reveals characteristic heart murmurs, such as a mid-diastolic rumble for mitral stenosis or a high-pitched blowing murmur for mitral regurgitation.
Diagnosing rheumatic heart disease relies on a combination of clinical history, physical examination, and objective imaging. Healthcare providers listen carefully for new or changing heart murmurs using a stethoscope. However, definitive diagnosis requires a transthoracic echocardiogram with color flow Doppler. Echocardiography allows clinicians to visualize structural abnormalities of the valve leaflets, measure chamber sizes, assess ventricular function, and grade the severity of stenosis or regurgitation. Additional investigations may include an electrocardiogram (ECG) to detect arrhythmias like atrial fibrillation and a chest X-ray to check for cardiomegaly or pulmonary congestion.
Once rheumatic heart disease is established, medical therapy focuses on managing symptoms, preventing complications, and stopping further episodes of acute rheumatic fever through secondary prophylaxis. Secondary prevention involves regular, long-term injections of benzathine penicillin G—typically administered intramuscularly every three to four weeks. This continuous antibiotic coverage protects damaged valves from recurrent streptococcal infections that would worsen the scarring. Symptomatic management includes using diuretics to reduce fluid overload, beta-blockers or rate-controlling agents for rapid heart rates, and anticoagulants for patients with atrial fibrillation to prevent thromboembolic strokes. Severe valve obstruction or failure ultimately requires surgical repair or replacement.
Midwives and nurses play a frontline role in caring for patients with rheumatic heart disease, particularly in resource-limited communities where the burden is highest. Nursing care centers on monitoring vital signs, assessing for fluid retention, administering prescribed medications, and preparing patients for surgical interventions when needed. Patient and family education is critical for long-term survival. Midwives must explain the absolute necessity of adhering to monthly secondary prophylaxis injections, even when the patient feels completely well. Health education should also emphasize seeking early medical treatment for any sore throat within the household to protect younger siblings and prevent new cases of acute rheumatic fever.