7 lines (6 with data), 248 Bytes

m225a 0 128 0 14:00:00 12/10/1988
# Start time=14:00
# First beat=14:22:34.265
# <age-range>: 45-49, <sex>: Male, <medication>: None
# <RR-low-limit(sec)>: 0.437,  <RR-high-limit(sec)>: 0.882
# Note: reel-to-reel recording, not flutter-compensated