7 lines (6 with data), 253 Bytes

m135b 0 128 0 9:15:00 09/11/1989
# Start time=09:15
# First beat=09:41:20.109
# <age-range>: 65-69, <sex>: Male, <medication>: Moricizine
# <RR-low-limit(sec)>: 0.437,  <RR-high-limit(sec)>: 0.953
# Note: reel-to-reel recording, not flutter-compensated