7 lines (6 with data), 260 Bytes

m078b 0 128 0 14:00:00 29/04/1991
# Start time=14:00
# First beat=14:31:38.429
# <age-range>: 65-69, <sex>: Female, <medication>: Moricizine
# <RR-low-limit(sec)>: 0.429,  <RR-high-limit(sec)>: 1.039
# Note: recording with a timing signal, flutter-compensated