7 lines (6 with data), 257 Bytes

m229b 0 128 0 9:00:00 02/02/1991
# Start time=09:00
# First beat=09:00:00.062
# <age-range>: 70-74, <sex>: Male, <medication>: Moricizine
# <RR-low-limit(sec)>: 0.562,  <RR-high-limit(sec)>: 1.039
# Note: recording with a timing signal, flutter-compensated