7 lines (6 with data), 260 Bytes

m192b 0 128 0 11:30:00 03/01/1991
# Start time=11:30
# First beat=11:44:03.234
# <age-range>: 55-59, <sex>: Female, <medication>: Moricizine
# <RR-low-limit(sec)>: 0.484,  <RR-high-limit(sec)>: 0.859
# Note: recording with a timing signal, flutter-compensated