7 lines (6 with data), 258 Bytes

m290b 0 128 0 15:10:00 10/10/1990
# Start time=15:10
# First beat=15:10:00.601
# <age-range>: 60-64, <sex>: Male, <medication>: Moricizine
# <RR-low-limit(sec)>: 0.484,  <RR-high-limit(sec)>: 0.867
# Note: recording with a timing signal, flutter-compensated