7 lines (6 with data), 250 Bytes

m079a 0 128 0 11:26:00 14/01/1990
# Start time=11:26
# First beat=11:28:22.093
# <age-range>: 70-74, <sex>: Female, <medication>: None
# <RR-low-limit(sec)>: 0.835,  <RR-high-limit(sec)>: 1.351
# Note: reel-to-reel recording, not flutter-compensated