7 lines (6 with data), 254 Bytes

m289b 0 128 0 11:28:00 17/10/1988
# Start time=11:28
# First beat=11:48:24.750
# <age-range>: 60-64, <sex>: Male, <medication>: Moricizine
# <RR-low-limit(sec)>: 0.445,  <RR-high-limit(sec)>: 0.976
# Note: reel-to-reel recording, not flutter-compensated