An autopsy of a 9-year-old girl who died after dental surgery ruled the death an accident.

The girl had a rare blood disorder that could have been triggered by the drugs administered during the surgery.

The death of a 9-year-old girl who became unresponsive after dental surgery in San Diego County has been ruled an accident resulting from a rare blood disorder, according to autopsy report by the San Diego County Medical Examiner‘s Office.

Silvanna Moreno died from a disorder called methemoglobinemia that could have been triggered by the administration of nitrous oxide and other commonly used anesthetic medications during her dental surgery on March 18, the medical examiner said.

Methemoglobinemia is a rare blood disorder which disrupts how iron in the hemoglobin can deliver oxygen

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