7 lines (6 with data), 253 Bytes

m128b 0 128 0 8:37:00 20/06/1988
# Start time=08:37
# First beat=08:42:33.101
# <age-range>: 45-49, <sex>: Male, <medication>: Moricizine
# <RR-low-limit(sec)>: 0.476,  <RR-high-limit(sec)>: 0.921
# Note: reel-to-reel recording, not flutter-compensated