7 lines (6 with data), 252 Bytes

m197a 0 128 0 10:10:00 13/05/1991
# Start time=10:10
# First beat=10:17:59.195
# <age-range>: 40-44, <sex>: Male, <medication>: None
# <RR-low-limit(sec)>: 0.437,  <RR-high-limit(sec)>: 0.851
# Note: recording with a timing signal, flutter-compensated