7 lines (6 with data), 248 Bytes

m172a 0 128 0 11:23:00 15/03/1990
# Start time=11:23
# First beat=11:43:30.039
# <age-range>: 60-64, <sex>: Male, <medication>: None
# <RR-low-limit(sec)>: 0.546,  <RR-high-limit(sec)>: 1.023
# Note: reel-to-reel recording, not flutter-compensated