7 lines (6 with data), 252 Bytes

m227a 0 128 0 10:10:00 16/07/1989
# Start time=10:10
# First beat=10:10:00.210
# <age-range>: 45-49, <sex>: Male, <medication>: None
# <RR-low-limit(sec)>: 0.578,  <RR-high-limit(sec)>: 1.164
# Note: recording with a timing signal, flutter-compensated