Key result
CPET unmasks persistent chronotropic incompetence following rhombencephalitis at 2-year follow-up.
Why the study?
Central cardiovascular dysfunction, specifically chronotropic incompetence, remains an underrecognized chronic sequela of rhombencephalitis, a rare inflammatory brainstem condition.
Case Report (n=1)
Cardiopulmonary exercise testing can help identify central chronotropic incompetence due to autonomic dysfunction in patients with unexplained exercise intolerance following brainstem injury when routine cardiac investigations are unremarkable.
Answers are grounded in this paper and cite their sources.
May warrant autonomic evaluation for exertional dyspnea after rhombencephalitis; leaves open prevalence and management in survivors.
BACKGROUND: Rhombencephalitis is a rare inflammatory brainstem condition. Central cardiovascular dysfunction, specifically chronotropic incompetence (CI), remains an underrecognized chronic sequela. CASE SUMMARY: A 50-year-old man was evaluated for progressive exertional dyspnea. Cardiopulmonary and structural cardiac assessments were unremarkable. One year earlier, he survived idiopathic biopsy-proven necrotizing rhombencephalitis, successfully managed with immunomodulatory therapy. Cardiopulmonary exercise testing unmasked profound CI. At the 2-year follow-up, peak oxygen uptake and workload normalized, but functional limitation persisted because of a rigidly blunted maximal heart rate. DISCUSSION: This unique case demonstrates a persistent decoupling of the heart-brain axis. The isolated CI may reflect focal structural destruction of medullary sympathetic premotor neurons, despite preserved intrinsic cardiac function. TAKE-HOME MESSAGES: In otherwise unexplained exercise intolerance following brainstem injury, central autonomic dysfunction may be considered as a potential contributor. Cardiopulmonary exercise testing may help identify a disproportionate chronotropic limitation when routine cardiac investigations are unremarkable.
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Schmick et al. (2026) conducted a case report in Progressive exertional dyspnea and central chronotropic incompetence after idiopathic necrotizing rhombencephalitis (n=1). Cardiopulmonary exercise testing was evaluated on Chronotropic incompetence and exercise capacity (peak oxygen uptake, workload, and maximal heart rate). Cardiopulmonary exercise testing unmasked profound chronotropic incompetence in a 50-year-old man after rhombencephalitis, with blunted maximal heart rate persisting at 2-year follow-up.
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