7 lines (6 with data), 258 Bytes

m142b 0 128 0 13:12:00 31/10/1990
# Start time=13:12
# First beat=13:16:22.265
# <age-range>: 55-59, <sex>: Male, <medication>: Moricizine
# <RR-low-limit(sec)>: 0.578,  <RR-high-limit(sec)>: 1.421
# Note: recording with a timing signal, flutter-compensated