7 lines (6 with data), 250 Bytes

m069a 0 128 0 14:10:00 06/03/1989
# Start time=14:10
# First beat=14:40:53.039
# <age-range>: 45-49, <sex>: Female, <medication>: None
# <RR-low-limit(sec)>: 0.523,  <RR-high-limit(sec)>: 0.828
# Note: reel-to-reel recording, not flutter-compensated