7 lines (6 with data), 258 Bytes

m171b 0 128 0 11:57:00 29/09/1989
# Start time=11:57
# First beat=12:00:03.679
# <age-range>: 65-69, <sex>: Male, <medication>: Moricizine
# <RR-low-limit(sec)>: 0.476,  <RR-high-limit(sec)>: 1.218
# Note: recording with a timing signal, flutter-compensated