7 lines (6 with data), 253 Bytes

f123b 0 128 0 10:00:00 27/03/1988
# Start time=10:00
# First beat=10:24:23.218
# <age-range>: 65-69, <sex>: Male, <medication>: Flecainide
# <RR-low-limit(sec)>: 0.601,  <RR-high-limit(sec)>: 1.21
# Note: reel-to-reel recording, not flutter-compensated