7 lines (6 with data), 253 Bytes

m225b 0 128 0 10:10:00 02/11/1988
# Start time=10:10
# First beat=10:32:17.171
# <age-range>: 45-49, <sex>: Male, <medication>: Moricizine
# <RR-low-limit(sec)>: 0.445,  <RR-high-limit(sec)>: 0.82
# Note: reel-to-reel recording, not flutter-compensated