7 lines (6 with data), 258 Bytes

m174b 0 128 0 13:50:00 15/01/1990
# Start time=13:50
# First beat=13:50:00.023
# <age-range>: 55-59, <sex>: Male, <medication>: Moricizine
# <RR-low-limit(sec)>: 0.554,  <RR-high-limit(sec)>: 1.015
# Note: recording with a timing signal, flutter-compensated