7 lines (6 with data), 252 Bytes

m047a 0 128 0 12:30:00 13/03/1991
# Start time=12:30
# First beat=12:39:13.187
# <age-range>: 75-79, <sex>: Male, <medication>: None
# <RR-low-limit(sec)>: 0.687,  <RR-high-limit(sec)>: 1.492
# Note: recording with a timing signal, flutter-compensated