What heart rate defines sinus tachycardia in a neonate?

Sinus tachycardia in a neonate is defined as a heart rate exceeding 180 beats per minute. This condition is characterized by a sustained increased heart rate originating from the sinoatrial node while maintaining a normal rhythm. It is important to understand the physiological context of neonatal heart rates, which are typically higher than those seen in older children and adults.

While neonates can have varying heart rates influenced by factors such as activity, sleep, and health status, a heart rate above 180 bpm indicates a level of tachycardia that warrants further evaluation. This could arise due to physiological responses, such as fever or pain, or pathological conditions like hypoxia or anemia, making it crucial to monitor and assess the neonate's overall condition when tachycardia is observed.