7 lines (6 with data), 248 Bytes

m245a 0 128 0 11:55:00 19/09/1989
# Start time=11:55
# First beat=12:17:56.132
# <age-range>: 65-69, <sex>: Male, <medication>: None
# <RR-low-limit(sec)>: 0.523,  <RR-high-limit(sec)>: 0.875
# Note: reel-to-reel recording, not flutter-compensated