7 lines (6 with data), 250 Bytes

m102a 0 128 0 14:43:00 01/03/1991
# Start time=14:43
# First beat=14:43:27.445
# <age-range>: 65-69, <sex>: Female, <medication>: None
# <RR-low-limit(sec)>: 0.656,  <RR-high-limit(sec)>: 1.554
# Note: reel-to-reel recording, not flutter-compensated