7 lines (6 with data), 254 Bytes

m215a 0 128 0 14:30:00 03/10/1989
# Start time=14:30
# First beat=14:30:00.640
# <age-range>: 75-79, <sex>: Female, <medication>: None
# <RR-low-limit(sec)>: 0.468,  <RR-high-limit(sec)>: 0.914
# Note: recording with a timing signal, flutter-compensated