The speedy response by medics at White Hart Lane gave Muamba the best possible chance of making a recovery, according to an expert yesterday.
Dr Graham Stuart, medical director of Sports Cardiology UK, told the Mirror: "The vital thing was how quickly he received treatment. Any delay can damage various organs. From what I saw, it was only a few minutes before he had help.
"Usually in these cases the reason for this happening is something to do with a heart muscle problem.
"All junior footballers from the age of 16-17 undergo checks in the UK. That would pick up any problem in the majority of cases but that is not always the case."