7 lines (6 with data), 257 Bytes

m269b 0 128 0 9:35:00 05/02/1991
# Start time=09:35
# First beat=09:43:13.453
# <age-range>: 60-64, <sex>: Male, <medication>: Moricizine
# <RR-low-limit(sec)>: 0.484,  <RR-high-limit(sec)>: 0.835
# Note: recording with a timing signal, flutter-compensated