7 lines (6 with data), 252 Bytes

m072a 0 128 0 11:30:00 17/03/1991
# Start time=11:30
# First beat=11:35:24.789
# <age-range>: 75-79, <sex>: Male, <medication>: None
# <RR-low-limit(sec)>: 0.515,  <RR-high-limit(sec)>: 1.007
# Note: recording with a timing signal, flutter-compensated