7 lines (6 with data), 259 Bytes

e121b 0 128 0 12:00:00 20/03/1988
# Start time=12:00
# First beat=12:00:23.343
# <age-range>: 65-69, <sex>: Female, <medication>: Encainide
# <RR-low-limit(sec)>: 0.421,  <RR-high-limit(sec)>: 0.835
# Note: recording with a timing signal, flutter-compensated