7 lines (6 with data), 248 Bytes

m091a 0 128 0 13:15:00 13/09/1990
# Start time=13:15
# First beat=13:31:32.929
# <age-range>: 70-74, <sex>: Male, <medication>: None
# <RR-low-limit(sec)>: 0.523,  <RR-high-limit(sec)>: 0.914
# Note: reel-to-reel recording, not flutter-compensated