7 lines (6 with data), 252 Bytes

m161a 0 128 0 11:10:00 26/11/1989
# Start time=11:10
# First beat=11:15:29.054
# <age-range>: 55-59, <sex>: Male, <medication>: None
# <RR-low-limit(sec)>: 0.687,  <RR-high-limit(sec)>: 1.445
# Note: recording with a timing signal, flutter-compensated