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Mom Told 3-Year-Old's Lingering Cough Is Asthma—Then Everything Changes

Mom Told 3-Year-Old's Lingering Cough Is Asthma—Then Everything Changes

Summary

Three-year-old Penelope Dunn became seriously ill after months of coughing and vomiting, which doctors initially treated as a childhood illness and asthma. She was later diagnosed with dilated cardiomyopathy and a dangerous heart rhythm, suffered severe brain damage after being placed on life support, and died eight days later.

Key Facts

  • Penelope’s symptoms began around Christmas 2025 and included a persistent cough and nighttime vomiting.
  • Her mother, Courtney Sherwood, said Penelope lost three kilograms in one month and stopped wanting to play and eat.
  • Doctors prescribed antibiotics and inhalers after examinations did not identify the cause of her symptoms.
  • On June 29, Penelope became breathless after one lap at her nursery’s sports day and later had two seizure-like episodes.
  • Doctors diagnosed Penelope with dilated cardiomyopathy, which affects the heart muscle, and monomorphic ventricular tachycardia, an abnormal heart rhythm.
  • Penelope was put on life support, which supported her heart and lungs.
  • Eight days later, her family was told she had catastrophic brain damage caused by oxygen deprivation; she died in her mother’s arms.
  • Her parents said doctors suspect a genetic cause, but testing has not established why her heart became ill.
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