7 lines (6 with data), 258 Bytes

m224b 0 128 0 17:30:00 13/04/1991
# Start time=17:30
# First beat=17:30:00.015
# <age-range>: 60-64, <sex>: Male, <medication>: Moricizine
# <RR-low-limit(sec)>: 0.523,  <RR-high-limit(sec)>: 1.296
# Note: recording with a timing signal, flutter-compensated