7 lines (6 with data), 258 Bytes

m038b 0 128 0 12:00:00 24/01/1991
# Start time=12:00
# First beat=12:08:21.398
# <age-range>: 50-54, <sex>: Male, <medication>: Moricizine
# <RR-low-limit(sec)>: 0.593,  <RR-high-limit(sec)>: 1.281
# Note: recording with a timing signal, flutter-compensated