7 lines (6 with data), 260 Bytes

m185b 0 128 0 11:30:00 08/11/1990
# Start time=11:30
# First beat=11:38:20.476
# <age-range>: 70-74, <sex>: Female, <medication>: Moricizine
# <RR-low-limit(sec)>: 0.468,  <RR-high-limit(sec)>: 0.812
# Note: recording with a timing signal, flutter-compensated