For successful intubation, which of the following is monitored alongside heart rate?

Monitoring the color of the CO2 detector is crucial during successful intubation because it provides immediate feedback on the effectiveness of the intubation process. When a tube is correctly placed in the trachea, exhaled carbon dioxide will turn the CO2 detector color to yellow or another specific hue, indicating proper ventilation. This is an essential feature in confirming that the airway has been secured, as it directly correlates with the patient’s respiratory status.

In contrast, while monitoring heart rate, heart rhythm, and factors like nail bed color can provide valuable information about a patient's overall condition, they do not specifically indicate the placement of the intubation tube. The CO2 detector acts as a direct and immediate validation of airway patency and adequacy of ventilation, making it an integral part of the intubation monitoring process.