7 lines (6 with data), 247 Bytes

m194a 0 128 0 9:15:00 28/03/1991
# Start time=09:15
# First beat=09:34:22.812
# <age-range>: 45-49, <sex>: Female, <medication>: None
# <RR-low-limit(sec)>: 0.5,  <RR-high-limit(sec)>: 1.031
# Note: reel-to-reel recording, not flutter-compensated