7 lines (6 with data), 248 Bytes

m021a 0 128 0 15:06:00 07/05/1990
# Start time=15:06
# First beat=15:12:43.765
# <age-range>: 75-79, <sex>: Male, <medication>: None
# <RR-low-limit(sec)>: 0.507,  <RR-high-limit(sec)>: 0.992
# Note: reel-to-reel recording, not flutter-compensated