7 lines (6 with data), 246 Bytes

m260a 0 128 0 11:00:00 25/12/1989
# Start time=11:00
# First beat=11:14:03.093
# <age-range>: 50-54, <sex>: Male, <medication>: None
# <RR-low-limit(sec)>: 0.5,  <RR-high-limit(sec)>: 0.992
# Note: reel-to-reel recording, not flutter-compensated