7 lines (6 with data), 258 Bytes

m089b 0 128 0 11:10:00 03/04/1991
# Start time=11:10
# First beat=11:18:23.101
# <age-range>: 65-69, <sex>: Male, <medication>: Moricizine
# <RR-low-limit(sec)>: 0.437,  <RR-high-limit(sec)>: 0.992
# Note: recording with a timing signal, flutter-compensated