A mother found her daughter collapsed in the bath after her heart suddenly stopped, an inquest heard.
Fit and healthy Amber Rummels, 18, was found under the water with the taps still running at her home in Cardiff.
Anita Lewis pulled her out of the bath and gave her CPR before paramedics managed to start her heart, but she died four days later in hospital on 5 December 2018.
Coroner Graeme Hughes recorded a narrative conclusion in Pontypridd.
A post-mortem examination found Amber died from hypoxic brain injury and a rare complication of pneumonia from nearly drowning due to sudden arrhythmic death syndrome (Sads).
Sads is when the heart stops beating unexpectedly due to an abnormal rhythm, and generally happens to younger people who do not know they have a heart problem.
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