9 lines (8 with data), 415 Bytes

m013b 0 125.44 0 14:02:00 20/11/1989
# Start time=14:02
# First beat=14:03:40.929
# <age-range>: 70-74, <sex>: Male, <medication>: Moricizine
# <RR-low-limit(sec)>: 0.601,  <RR-high-limit(sec)>: 1.304
# Note: reel-to-reel recording, not flutter-compensated;
#       time rescaled to fit the recording speed (1.47mm/s) from the scanning
#       speed (1.50mm/s) (i.e., sampling-rate adjusted to 125.44Hz from 128Hz)