7 lines (6 with data), 258 Bytes

m150b 0 128 0 11:00:00 11/07/1990
# Start time=11:00
# First beat=11:00:00.476
# <age-range>: 60-64, <sex>: Male, <medication>: Moricizine
# <RR-low-limit(sec)>: 0.648,  <RR-high-limit(sec)>: 1.179
# Note: recording with a timing signal, flutter-compensated