7 lines (6 with data), 258 Bytes

m223b 0 128 0 13:32:00 14/08/1990
# Start time=13:32
# First beat=13:39:33.757
# <age-range>: 50-54, <sex>: Male, <medication>: Moricizine
# <RR-low-limit(sec)>: 0.539,  <RR-high-limit(sec)>: 1.203
# Note: recording with a timing signal, flutter-compensated