Final answer:
When a baby has an HR of 80 BPM on the ECG monitor after receiving chest compressions and ventilation, the next step is to check for a pulse to determine if compressions should continue or if maintaining ventilation is sufficient.
Step-by-step explanation:
If a baby has received chest compressions and coordinated ventilation, and the ECG monitor then shows a heart rate (HR) of 80 BPM, you should next check for a pulse. If a pulse is present, the chest compressions can typically be discontinued, and emphasis should be placed on maintaining adequate ventilation and monitoring the baby closely. If there is no pulse or the pulse is insufficient (weak or faint), CPR with chest compressions and ventilation should be resumed promptly. After performing CPR, it is also important to reassess the patient's status regularly to determine if there are any changes in heart rhythm and to check again for pulse and breathing.