7 lines (6 with data), 258 Bytes

m244b 0 128 0 15:00:00 23/01/1991
# Start time=15:00
# First beat=15:00:00.664
# <age-range>: 75-79, <sex>: Male, <medication>: Moricizine
# <RR-low-limit(sec)>: 0.531,  <RR-high-limit(sec)>: 1.132
# Note: recording with a timing signal, flutter-compensated