7 lines (6 with data), 254 Bytes

m260b 0 128 0 10:30:00 21/01/1990
# Start time=10:30
# First beat=10:36:42.515
# <age-range>: 50-54, <sex>: Male, <medication>: Moricizine
# <RR-low-limit(sec)>: 0.578,  <RR-high-limit(sec)>: 1.296
# Note: reel-to-reel recording, not flutter-compensated