7 lines (6 with data), 251 Bytes

m054a 0 128 0 10:00:00 17/10/1989
# Start time=10:00
# First beat=10:08:00.914
# <age-range>: 65-69, <sex>: Male, <medication>: None
# <RR-low-limit(sec)>: 0.375,  <RR-high-limit(sec)>: 0.75
# Note: recording with a timing signal, flutter-compensated