7 lines (6 with data), 249 Bytes

m216a 0 128 0 9:59:00 16/06/1990
# Start time=09:59
# First beat=09:59:12.164
# <age-range>: 70-74, <sex>: Female, <medication>: None
# <RR-low-limit(sec)>: 0.445,  <RR-high-limit(sec)>: 0.757
# Note: reel-to-reel recording, not flutter-compensated