7 lines (6 with data), 254 Bytes

m151b 0 128 0 13:20:00 21/06/1988
# Start time=13:20
# First beat=13:20:00.437
# <age-range>: 60-64, <sex>: Male, <medication>: Moricizine
# <RR-low-limit(sec)>: 0.468,  <RR-high-limit(sec)>: 0.906
# Note: reel-to-reel recording, not flutter-compensated