The document discusses several pediatric cardiology emergencies including newborn problems presenting as cyanosis or low cardiac output. Cyanosis may be caused by right-sided obstructive lesions, abnormal circulations, or left-sided obstructive lesions. Treatment involves prostaglandins, restoring acid-base balance, and surgery. Low cardiac output can be caused by muscle diseases, heart rate problems, or left-sided obstructive lesions. Other issues discussed include hypercyanotic spells in infants/children with tetralogy of Fallot or pulmonary atresia, congestive heart failure, and arrhythmias including supraventricular tachycardia.