7 lines (6 with data), 258 Bytes

m197b 0 128 0 10:45:00 24/06/1991
# Start time=10:45
# First beat=10:53:22.437
# <age-range>: 40-44, <sex>: Male, <medication>: Moricizine
# <RR-low-limit(sec)>: 0.406,  <RR-high-limit(sec)>: 0.812
# Note: recording with a timing signal, flutter-compensated