7 lines (6 with data), 253 Bytes

m181b 0 128 0 11:30:00 29/04/1991
# Start time=11:30
# First beat=11:31:56.312
# <age-range>: 50-54, <sex>: Male, <medication>: Moricizine
# <RR-low-limit(sec)>: 0.484,  <RR-high-limit(sec)>: 0.96
# Note: reel-to-reel recording, not flutter-compensated