7 lines (6 with data), 260 Bytes

m199b 0 128 0 15:33:00 08/12/1990
# Start time=15:33
# First beat=15:42:10.648
# <age-range>: 50-54, <sex>: Female, <medication>: Moricizine
# <RR-low-limit(sec)>: 0.335,  <RR-high-limit(sec)>: 0.906
# Note: recording with a timing signal, flutter-compensated