7 lines (6 with data), 252 Bytes

m155b 0 128 0 11:00:00 15/03/1991
# Start time=11:00
# First beat=11:27:21.289
# <age-range>: 55-59, <sex>: Male, <medication>: Moricizine
# <RR-low-limit(sec)>: 0.5,  <RR-high-limit(sec)>: 0.835
# Note: reel-to-reel recording, not flutter-compensated