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Barth syndrome doesn't let up with age. Experts outline a disease course that begins with dangerous cardiac complications in infancy, transitions into a deceptively stable "honeymoon period," and carries serious long-term mortality risks — all while milder cases in older patients often go undetected.
Barth syndrome is a rare, X-linked genetic disorder that affects the heart, immune system, and growth — and its challenges evolve significantly across a patient's lifetime. In infancy, the condition can be life-threatening, presenting with cardiomegaly, dilated ventricles, feeding difficulties, and the risk of cardiogenic shock. Between ages 5 and 25, patients may enter a relative "honeymoon period," but ongoing neutropenia, growth delays, and frequent specialist visits remain the norm.
The long-term picture is sobering. Heart failure accounts for roughly half of all deaths in Barth syndrome patients, with sepsis and arrhythmia each contributing around 20%. Experts also flag a significant underdiagnosis problem: patients identified later in life often present with neutropenia but lack the obvious early cardiomyopathy, suggesting milder phenotypes are being missed.
Key Takeaways:
Why it matters: Recognizing Barth syndrome across its full spectrum — not just in its most severe early presentations — is critical for timely intervention and improved outcomes at every stage of life.
