7 lines (6 with data), 253 Bytes

m210b 0 128 0 8:40:00 31/07/1991
# Start time=08:40
# First beat=08:40:00.335
# <age-range>: 55-59, <sex>: Male, <medication>: Moricizine
# <RR-low-limit(sec)>: 0.601,  <RR-high-limit(sec)>: 1.242
# Note: reel-to-reel recording, not flutter-compensated