7 lines (6 with data), 248 Bytes

f126a 0 128 0 18:30:00 02/03/1988
# Start time=18:30
# First beat=18:53:56.859
# <age-range>: 70-74, <sex>: Male, <medication>: None
# <RR-low-limit(sec)>: 0.671,  <RR-high-limit(sec)>: 1.968
# Note: reel-to-reel recording, not flutter-compensated