system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
Which of the following can be used to calculate hea rate from an ECG?
assistant
The correct answer is  For calculating hea rate: HR-300/ Number of large squares(0.20 secs) in one R-R interval HR-1500/no of small squares (0.04 secs) in one R-R interval