7 lines (6 with data), 254 Bytes

m149b 0 128 0 10:15:00 01/04/1989
# Start time=10:15
# First beat=10:29:49.867
# <age-range>: 65-69, <sex>: Male, <medication>: Moricizine
# <RR-low-limit(sec)>: 0.609,  <RR-high-limit(sec)>: 1.054
# Note: reel-to-reel recording, not flutter-compensated