7 lines (6 with data), 249 Bytes

m127b 0 128 0 10:10:00 21/04/1989
# Start time=10:10
# First beat=10:17:03.570
# <age-range>: 55-59, <sex>: Male, <medication>: Moricizine
# <RR-low-limit(sec)>: 0.57,  <RR-high-limit(sec)>: 1
# Note: reel-to-reel recording, not flutter-compensated