7 lines (6 with data), 250 Bytes

e147a 0 128 0 11:15:00 12/04/1991
# Start time=11:15
# First beat=11:23:20.648
# <age-range>: 70-74, <sex>: Male, <medication>: None
# <RR-low-limit(sec)>: 0.617,  <RR-high-limit(sec)>: 1.5
# Note: recording with a timing signal, flutter-compensated