7 lines (6 with data), 254 Bytes

m267b 0 128 0 10:21:00 24/09/1989
# Start time=10:21
# First beat=10:34:25.656
# <age-range>: 65-69, <sex>: Male, <medication>: Moricizine
# <RR-low-limit(sec)>: 0.437,  <RR-high-limit(sec)>: 0.968
# Note: reel-to-reel recording, not flutter-compensated