7 lines (6 with data), 257 Bytes

m100b 0 128 0 12:45:00 05/08/1989
# Start time=12:45
# First beat=12:53:52.421
# <age-range>: 70-74, <sex>: Male, <medication>: Moricizine
# <RR-low-limit(sec)>: 0.492,  <RR-high-limit(sec)>: 0.71
# Note: recording with a timing signal, flutter-compensated