7 lines (6 with data), 257 Bytes

m131b 0 128 0 9:32:00 20/04/1991
# Start time=09:32
# First beat=09:35:50.968
# <age-range>: 50-54, <sex>: Male, <medication>: Moricizine
# <RR-low-limit(sec)>: 0.398,  <RR-high-limit(sec)>: 0.859
# Note: recording with a timing signal, flutter-compensated