7 lines (6 with data), 255 Bytes

m136b 0 128 0 9:40:00 14/01/1990
# Start time=09:40
# First beat=09:45:39.734
# <age-range>: 50-54, <sex>: Female, <medication>: Moricizine
# <RR-low-limit(sec)>: 0.507,  <RR-high-limit(sec)>: 1.015
# Note: reel-to-reel recording, not flutter-compensated