7 lines (6 with data), 254 Bytes

m236b 0 128 0 11:26:00 20/02/1989
# Start time=11:26
# First beat=11:29:39.203
# <age-range>: 40-44, <sex>: Male, <medication>: Moricizine
# <RR-low-limit(sec)>: 0.515,  <RR-high-limit(sec)>: 1.304
# Note: reel-to-reel recording, not flutter-compensated