Can albuterol cause cardiac arrest in children?

Extremely: Unlikely but may get high heart rates due to beta agonist.

No, but: If you overdose on any drug, you can get very ill or die. Even water, right? If albuterol is given in excess, it can become toxic. If a child (or adult) has such a bad asthma attack that they need to take constant or frequently repeating doses of albuterol, they should go to the er as uncontrolled asthma is a true emergency and there are other treatments available at the hospital.