7 lines (6 with data), 254 Bytes

m203b 0 128 0 10:03:00 19/01/1989
# Start time=10:03
# First beat=10:11:52.640
# <age-range>: 75-79, <sex>: Male, <medication>: Moricizine
# <RR-low-limit(sec)>: 0.515,  <RR-high-limit(sec)>: 1.117
# Note: reel-to-reel recording, not flutter-compensated