7 lines (6 with data), 254 Bytes

m065b 0 128 0 12:33:00 12/04/1990
# Start time=12:33
# First beat=12:33:13.992
# <age-range>: 60-64, <sex>: Male, <medication>: Moricizine
# <RR-low-limit(sec)>: 0.468,  <RR-high-limit(sec)>: 0.773
# Note: reel-to-reel recording, not flutter-compensated