7 lines (6 with data), 253 Bytes

m160a 0 128 0 13:32:00 26/11/1989
# Start time=13:32
# First beat=13:40:03.164
# <age-range>: 60-64, <sex>: Female, <medication>: None
# <RR-low-limit(sec)>: 0.46,  <RR-high-limit(sec)>: 1.039
# Note: recording with a timing signal, flutter-compensated