7 lines (6 with data), 260 Bytes

m186b 0 128 0 14:31:00 22/07/1990
# Start time=14:31
# First beat=14:34:33.421
# <age-range>: 65-69, <sex>: Female, <medication>: Moricizine
# <RR-low-limit(sec)>: 0.492,  <RR-high-limit(sec)>: 0.851
# Note: recording with a timing signal, flutter-compensated