7 lines (6 with data), 250 Bytes

e262a 0 128 0 9:15:00 21/02/1989
# Start time=09:15
# First beat=09:19:05.507
# <age-range>: 55-59, <sex>: Male, <medication>: None
# <RR-low-limit(sec)>: 0.64,  <RR-high-limit(sec)>: 1.125
# Note: recording with a timing signal, flutter-compensated