7 lines (6 with data), 248 Bytes

e234a 0 128 0 14:30:00 01/05/1988
# Start time=14:30
# First beat=14:42:58.710
# <age-range>: 55-59, <sex>: Female, <medication>: None
# <RR-low-limit(sec)>: 0.5,  <RR-high-limit(sec)>: 0.953
# Note: reel-to-reel recording, not flutter-compensated