7 lines (6 with data), 257 Bytes

m250b 0 128 0 8:30:00 29/05/1991
# Start time=08:30
# First beat=08:38:22.750
# <age-range>: 55-59, <sex>: Male, <medication>: Moricizine
# <RR-low-limit(sec)>: 0.476,  <RR-high-limit(sec)>: 1.078
# Note: recording with a timing signal, flutter-compensated