7 lines (6 with data), 254 Bytes

m221b 0 128 0 12:00:00 09/10/1989
# Start time=12:00
# First beat=12:00:00.335
# <age-range>: 65-69, <sex>: Male, <medication>: Moricizine
# <RR-low-limit(sec)>: 0.429,  <RR-high-limit(sec)>: 0.992
# Note: reel-to-reel recording, not flutter-compensated