7 lines (6 with data), 258 Bytes

m214b 0 128 0 14:20:00 25/01/1990
# Start time=14:20
# First beat=14:28:10.257
# <age-range>: 70-74, <sex>: Male, <medication>: Moricizine
# <RR-low-limit(sec)>: 0.515,  <RR-high-limit(sec)>: 0.914
# Note: recording with a timing signal, flutter-compensated