7 lines (6 with data), 254 Bytes

m123b 0 128 0 10:43:00 27/06/1991
# Start time=10:43
# First beat=10:46:54.375
# <age-range>: 70-74, <sex>: Male, <medication>: Moricizine
# <RR-low-limit(sec)>: 0.554,  <RR-high-limit(sec)>: 1.242
# Note: reel-to-reel recording, not flutter-compensated