7 lines (6 with data), 250 Bytes

e149a 0 128 0 11:25:00 24/03/1988
# Start time=11:25
# First beat=11:43:14.304
# <age-range>: 65-69, <sex>: Female, <medication>: None
# <RR-low-limit(sec)>: 0.656,  <RR-high-limit(sec)>: 1.195
# Note: reel-to-reel recording, not flutter-compensated