7 lines (6 with data), 250 Bytes

f173a 0 128 0 15:00:00 14/12/1987
# Start time=15:00
# First beat=15:12:28.835
# <age-range>: 60-64, <sex>: Female, <medication>: None
# <RR-low-limit(sec)>: 0.671,  <RR-high-limit(sec)>: 1.453
# Note: reel-to-reel recording, not flutter-compensated