7 lines (6 with data), 258 Bytes

m025b 0 128 0 10:45:00 23/05/1990
# Start time=10:45
# First beat=10:53:19.882
# <age-range>: 55-59, <sex>: Male, <medication>: Moricizine
# <RR-low-limit(sec)>: 0.437,  <RR-high-limit(sec)>: 0.828
# Note: recording with a timing signal, flutter-compensated