7 lines (6 with data), 254 Bytes

m078a 0 128 0 14:00:00 03/04/1991
# Start time=14:00
# First beat=14:01:56.609
# <age-range>: 65-69, <sex>: Female, <medication>: None
# <RR-low-limit(sec)>: 0.367,  <RR-high-limit(sec)>: 0.875
# Note: recording with a timing signal, flutter-compensated