7 lines (6 with data), 254 Bytes

m251b 0 128 0 11:30:00 10/07/1988
# Start time=11:30
# First beat=11:49:48.437
# <age-range>: 55-59, <sex>: Male, <medication>: Moricizine
# <RR-low-limit(sec)>: 0.539,  <RR-high-limit(sec)>: 1.203
# Note: reel-to-reel recording, not flutter-compensated