7 lines (6 with data), 252 Bytes

m179a 0 128 0 15:15:00 01/10/1990
# Start time=15:15
# First beat=15:22:30.468
# <age-range>: 55-59, <sex>: Male, <medication>: None
# <RR-low-limit(sec)>: 0.609,  <RR-high-limit(sec)>: 0.984
# Note: recording with a timing signal, flutter-compensated