7 lines (6 with data), 254 Bytes

m237b 0 128 0 23:49:00 23/06/1991
# Start time=23:49
# First beat=23:49:07.609
# <age-range>: 55-59, <sex>: Male, <medication>: Moricizine
# <RR-low-limit(sec)>: 0.617,  <RR-high-limit(sec)>: 1.335
# Note: reel-to-reel recording, not flutter-compensated