What heart rate indicates a score of 0 for an infant's heart rate on the APGAR scale?

In the context of the APGAR scale, a score of 0 for an infant's heart rate indicates that there is no detectable heart rate at all, which aligns with the choice of zero. The APGAR scoring system evaluates five criteria: Appearance, Pulse, Grimace response, Activity, and Respiration, each assigned a score of 0, 1, or 2, depending on the infant's condition at one minute and five minutes after birth.

For heart rate, a score of 0 is specifically given when there is no pulse present, signifying a critical condition that requires immediate medical attention. This absence of a heart rate is crucial for understanding the infant's immediate need for resuscitative measures.

In contrast, a heart rate of below 60 BPM or exactly 60 BPM would still provide some level of cardiac activity, resulting in a score of 1 in the APGAR assessment, while a heart rate above 100 BPM would yield a score of 2. Therefore, the choice indicating a score of 0—representing complete absence of heart activity—is indeed zero.