7 lines (6 with data), 248 Bytes

m141a 0 128 0 14:30:00 22/10/1988
# Start time=14:30
# First beat=14:51:59.085
# <age-range>: 65-69, <sex>: Male, <medication>: None
# <RR-low-limit(sec)>: 0.531,  <RR-high-limit(sec)>: 0.898
# Note: reel-to-reel recording, not flutter-compensated