7 lines (6 with data), 259 Bytes

m212b 0 128 0 9:43:00 04/05/1989
# Start time=09:43
# First beat=09:50:31.468
# <age-range>: 60-64, <sex>: Female, <medication>: Moricizine
# <RR-low-limit(sec)>: 0.476,  <RR-high-limit(sec)>: 1.046
# Note: recording with a timing signal, flutter-compensated