7 lines (6 with data), 252 Bytes

m046a 0 128 0 11:15:00 31/03/1991
# Start time=11:15
# First beat=11:15:00.515
# <age-range>: 40-44, <sex>: Male, <medication>: None
# <RR-low-limit(sec)>: 0.476,  <RR-high-limit(sec)>: 1.226
# Note: recording with a timing signal, flutter-compensated