7 lines (6 with data), 248 Bytes

m043a 0 128 0 21:25:00 16/01/1991
# Start time=21:25
# First beat=22:21:13.687
# <age-range>: 65-69, <sex>: Male, <medication>: None
# <RR-low-limit(sec)>: 0.546,  <RR-high-limit(sec)>: 1.023
# Note: reel-to-reel recording, not flutter-compensated