7 lines (6 with data), 260 Bytes

m190b 0 128 0 10:45:00 19/05/1991
# Start time=10:45
# First beat=10:45:43.585
# <age-range>: 65-69, <sex>: Female, <medication>: Moricizine
# <RR-low-limit(sec)>: 0.437,  <RR-high-limit(sec)>: 1.109
# Note: recording with a timing signal, flutter-compensated