You are evaluating a 5-year-old child with breath holding spells, the history given includes pallor with abnormal limb movement lasted for 5 minutes followed by sleep

(A). in non-classical type of breath holding spells; medical conditions to consider should include seizures, Chiari crisis, dysautonomia, cardiac arrhythmias (as prolonged QT interval), and central nervous system lesions. So all the above optional investigations are justifiabl