(Reuters) - Italian rider Sonny Colbrelli, who required emergency treatment after collapsing at the Volta a Catalunya race in March and was fitted with a subcutaneous defibrillator implant (ICD), said on Sunday he will retire from professional cycling.
Colbrelli was edged out by Australian Michael Matthews at the end of the opening stage of the race in Spain and fell to the ground. He needed defibrillation and was later diagnosed with an "unstable cardiac arrhythmia".
