7 lines (6 with data), 258 Bytes

m268b 0 128 0 10:00:00 02/04/1990
# Start time=10:00
# First beat=10:03:44.687
# <age-range>: 75-79, <sex>: Male, <medication>: Moricizine
# <RR-low-limit(sec)>: 0.578,  <RR-high-limit(sec)>: 1.312
# Note: recording with a timing signal, flutter-compensated