7 lines (6 with data), 250 Bytes

e183a 0 128 0 17:00:00 18/11/1987
# Start time=17:00
# First beat=17:17:26.414
# <age-range>: 70-74, <sex>: Female, <medication>: None
# <RR-low-limit(sec)>: 0.453,  <RR-high-limit(sec)>: 0.859
# Note: reel-to-reel recording, not flutter-compensated