7 lines (6 with data), 258 Bytes

m071b 0 128 0 13:30:00 04/04/1989
# Start time=13:30
# First beat=13:33:01.289
# <age-range>: 75-79, <sex>: Male, <medication>: Moricizine
# <RR-low-limit(sec)>: 0.437,  <RR-high-limit(sec)>: 0.765
# Note: recording with a timing signal, flutter-compensated