7 lines (6 with data), 250 Bytes

m110a 0 128 0 10:14:00 09/05/1991
# Start time=10:14
# First beat=10:16:54.781
# <age-range>: 65-69, <sex>: Female, <medication>: None
# <RR-low-limit(sec)>: 0.445,  <RR-high-limit(sec)>: 1
# Note: recording with a timing signal, flutter-compensated