7 lines (6 with data), 247 Bytes

f145a 0 128 0 9:35:00 18/04/1988
# Start time=09:35
# First beat=09:56:02.218
# <age-range>: 60-64, <sex>: Male, <medication>: None
# <RR-low-limit(sec)>: 0.468,  <RR-high-limit(sec)>: 0.843
# Note: reel-to-reel recording, not flutter-compensated