7 lines (6 with data), 247 Bytes

m154a 0 128 0 13:37:00 20/08/1990
# Start time=13:37
# First beat=15:17:59.515
# <age-range>: 75-79, <sex>: Male, <medication>: None
# <RR-low-limit(sec)>: 0.57,  <RR-high-limit(sec)>: 1.179
# Note: reel-to-reel recording, not flutter-compensated