7 lines (6 with data), 248 Bytes

m249a 0 128 0 11:10:00 30/04/1991
# Start time=11:10
# First beat=11:18:20.703
# <age-range>: 75-79, <sex>: Male, <medication>: None
# <RR-low-limit(sec)>: 0.632,  <RR-high-limit(sec)>: 1.312
# Note: reel-to-reel recording, not flutter-compensated