7 lines (6 with data), 250 Bytes

e114a 0 128 0 17:01:00 20/03/1988
# Start time=17:01
# First beat=17:04:13.804
# <age-range>: 50-54, <sex>: Male, <medication>: None
# <RR-low-limit(sec)>: 0.57,  <RR-high-limit(sec)>: 1.46
# Note: recording with a timing signal, flutter-compensated