7 lines (6 with data), 257 Bytes

m255b 0 128 0 9:00:00 16/02/1990
# Start time=09:00
# First beat=09:08:10.984
# <age-range>: 35-39, <sex>: Male, <medication>: Moricizine
# <RR-low-limit(sec)>: 0.531,  <RR-high-limit(sec)>: 1.265
# Note: recording with a timing signal, flutter-compensated