7 lines (6 with data), 254 Bytes

m189a 0 128 0 13:09:00 13/01/1991
# Start time=13:09
# First beat=13:16:30.593
# <age-range>: 75-79, <sex>: Female, <medication>: None
# <RR-low-limit(sec)>: 0.664,  <RR-high-limit(sec)>: 1.039
# Note: recording with a timing signal, flutter-compensated