7 lines (6 with data), 248 Bytes

e171a 0 128 0 12:00:00 28/12/1988
# Start time=12:00
# First beat=12:04:41.304
# <age-range>: 50-54, <sex>: Male, <medication>: None
# <RR-low-limit(sec)>: 0.539,  <RR-high-limit(sec)>: 1.273
# Note: reel-to-reel recording, not flutter-compensated