7 lines (6 with data), 254 Bytes

m156b 0 128 0 12:30:00 16/04/1989
# Start time=12:30
# First beat=12:45:12.242
# <age-range>: 60-64, <sex>: Male, <medication>: Moricizine
# <RR-low-limit(sec)>: 0.507,  <RR-high-limit(sec)>: 1.281
# Note: reel-to-reel recording, not flutter-compensated