7 lines (6 with data), 250 Bytes

f164b 0 128 0 11:30:00 17/08/1988
# Start time=11:30
# First beat=11:36:27.406
# <age-range>: 70-74, <sex>: Female, <medication>: Flecainide
# <RR-low-limit(sec)>: NA,  <RR-high-limit(sec)>: NA
# Note: reel-to-reel recording, not flutter-compensated