7 lines (6 with data), 247 Bytes

m181a 0 128 0 16:55:00 09/04/1991
# Start time=16:55
# First beat=17:10:07.367
# <age-range>: 50-54, <sex>: Male, <medication>: None
# <RR-low-limit(sec)>: 0.453,  <RR-high-limit(sec)>: 0.82
# Note: reel-to-reel recording, not flutter-compensated