Bolton's Muamba, 23, collapsed during Saturday's FA Cup tie with Tottenham and remains in intensive care.
Cardiologist Dr Sam Mohiddin said the most important thing now for a patient like Muamba was neurological recovery.
He also said a special "defibrillator" pacemaker was often implanted into patients following a cardiac arrest.
Muamba treatment timeline
Muamba collapses on the pitch due to a cardiac arrest 41 minutes into Bolton's FA Cup quarter-final with Tottenham at White Hart Lane
Medics move Muamba to an ambulance after failing to revive him on the pitch in front of a stunned crowd
Muamba arrives at the London Chest hospital
Muamba receives 15 defibrillator shocks in total before his heart starts beating again
Dr Mohiddin, who is treating Muamba at London Chest Hospital, told BBC Sport's Dan Roan: "Almost everybody who comes into us with a cardiac arrest, who has been successfully resuscitated, would be considered for a defibrillator because they're life-saving devices.
"What has happened may happen again and, therefore, if there's any risk you want a safety net."
He could not say if Muamba would ever be able to play football again, adding: "I don't think we can even begin to discuss that as it's a question that requires all sorts of unknowns in its answering."
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