7 lines (6 with data), 248 Bytes

e231a 0 128 0 10:00:00 25/08/1988
# Start time=10:00
# First beat=10:17:36.265
# <age-range>: 55-59, <sex>: Male, <medication>: None
# <RR-low-limit(sec)>: 0.554,  <RR-high-limit(sec)>: 1.023
# Note: reel-to-reel recording, not flutter-compensated