7 lines (6 with data), 253 Bytes

m083b 0 128 0 11:27:00 04/11/1987
# Start time=11:27
# First beat=11:48:54.734
# <age-range>: 70-74, <sex>: Male, <medication>: Moricizine
# <RR-low-limit(sec)>: 0.46,  <RR-high-limit(sec)>: 0.703
# Note: reel-to-reel recording, not flutter-compensated