A18.84 Tuberculosis of heart

Name of the Condition

• Tuberculosis of heart
• ICD Code: A18.84

Summary

Tuberculosis of the heart is a rare form of extrapulmonary tuberculosis where Mycobacterium tuberculosis infects cardiac structures. This condition occurs when TB bacteria spread from a primary site, typically the lungs, to the heart via the bloodstream or lymphatic system. It can involve the pericardium, myocardium, or endocardium, depending on the site of dissemination. Clinical presentation may vary based on the affected cardiac component and extent of infection.

Causes

Tuberculosis of the heart is caused by the dissemination of Mycobacterium tuberculosis from an existing infection, usually pulmonary tuberculosis. The bacteria can travel to the heart during active disease or reactivation of latent TB. Direct inoculation is rare but possible in certain cases.

Risk Factors

• Immunocompromised states, such as HIV/AIDS or chronic steroid use.
• History of untreated or inadequately treated tuberculosis.
• Close contact with individuals who have active TB.
• Living in or traveling to regions with high TB prevalence.
• Underlying conditions like diabetes or malnutrition.

Symptoms

• Chest pain or discomfort, which may be sharp or dull.
• Shortness of breath (dyspnea).
• Fatigue or weakness.
• Fever, night sweats, or unexplained weight loss.
• Palpitations or irregular heartbeat (arrhythmias).
• Swelling in the legs or abdomen (edema) if pericardial effusion occurs.

Diagnosis

Diagnosis involves a combination of clinical evaluation, imaging, and laboratory tests. A thorough history of TB exposure or prior infection is essential. Imaging studies, such as echocardiography, may reveal pericardial effusion, thickening, or myocardial involvement. Cardiac MRI can assess tissue inflammation. Laboratory tests include acid-fast bacilli (AFB) staining, culture, or nucleic acid amplification tests (NAAT) from pericardial fluid or tissue samples. Biopsy of affected cardiac tissue may be performed for definitive diagnosis.

Treatment Options

Treatment typically follows standard anti-tuberculosis regimens, including a combination of first-line drugs (e.g., isoniazid, rifampin, pyrazinamide, ethambutol) for at least six months. Corticosteroids may be used to reduce inflammation, especially in pericardial TB with effusion. Surgical intervention, such as pericardiectomy, may be necessary for persistent effusion or constrictive pericarditis. Close monitoring for drug toxicity and treatment response is critical.

Prognosis and Follow-Up

Prognosis depends on early diagnosis, timely treatment, and the extent of cardiac involvement. With appropriate therapy, many patients achieve full recovery. However, delayed treatment or severe cardiac damage may lead to complications. Follow-up includes regular clinical assessments, imaging to monitor cardiac function, and adherence to the full treatment course. Lifelong monitoring for recurrence or late complications may be recommended.

Complications

• Constrictive pericarditis, leading to impaired cardiac function.
• Myocardial dysfunction or heart failure.
• Arrhythmias or conduction abnormalities.
• Pericardial effusion with tamponade, requiring urgent intervention.
• Systemic dissemination of TB if untreated.

Lifestyle & Prevention

• Adhere to prescribed anti-TB medications to prevent resistance.
• Maintain a balanced diet and adequate rest to support immune function.
• Avoid close contact with individuals who have active TB until non-infectious.
• Practice good hygiene, including handwashing, to reduce infection risk.
• Seek prompt medical care for TB symptoms or exposure.

When to Seek Professional Help

Seek immediate medical attention if you experience severe chest pain, difficulty breathing, fainting, or signs of heart failure (e.g., swelling, rapid weight gain). Contact a healthcare provider for persistent symptoms like fever, night sweats, or unexplained weight loss, especially if you have a history of TB or exposure.

Tips for Medical Coders

Code A18.84 is specific to tuberculosis of the heart and should be used when the infection involves cardiac structures (e.g., pericardium, myocardium, endocardium). Documentation should specify the affected cardiac component and confirm TB as the cause. Ensure the diagnosis is supported by clinical findings, imaging, or laboratory evidence. Do not use this code for TB involving other organs; select the appropriate ICD-10-CM code for the specific site.