7 lines (6 with data), 246 Bytes

m221a 0 128 0 11:28:00 12/08/1989
# Start time=11:28
# First beat=11:43:54.625
# <age-range>: 65-69, <sex>: Male, <medication>: None
# <RR-low-limit(sec)>: 0.5,  <RR-high-limit(sec)>: 0.968
# Note: reel-to-reel recording, not flutter-compensated