7 lines (6 with data), 250 Bytes

e148a 0 128 0 11:18:00 26/01/1988
# Start time=11:18
# First beat=11:40:27.296
# <age-range>: 65-69, <sex>: Female, <medication>: None
# <RR-low-limit(sec)>: 0.476,  <RR-high-limit(sec)>: 1.479
# Note: reel-to-reel recording, not flutter-compensated