7 lines (6 with data), 257 Bytes

m147b 0 128 0 14:00:00 17/06/1991
# Start time=14:00
# First beat=14:07:44.773
# <age-range>: 70-74, <sex>: Male, <medication>: Moricizine
# <RR-low-limit(sec)>: 0.64,  <RR-high-limit(sec)>: 1.312
# Note: recording with a timing signal, flutter-compensated