7 lines (6 with data), 260 Bytes

m215b 0 128 0 10:00:00 24/12/1989
# Start time=10:00
# First beat=10:00:00.195
# <age-range>: 75-79, <sex>: Female, <medication>: Moricizine
# <RR-low-limit(sec)>: 0.476,  <RR-high-limit(sec)>: 1.125
# Note: recording with a timing signal, flutter-compensated