7 lines (6 with data), 255 Bytes

m276b 0 128 0 9:45:00 19/02/1990
# Start time=09:45
# First beat=11:08:03.742
# <age-range>: 55-59, <sex>: Female, <medication>: Moricizine
# <RR-low-limit(sec)>: 0.578,  <RR-high-limit(sec)>: 1.039
# Note: reel-to-reel recording, not flutter-compensated