7 lines (6 with data), 254 Bytes

m288b 0 128 0 10:00:00 07/08/1990
# Start time=10:00
# First beat=10:00:06.234
# <age-range>: 70-74, <sex>: Male, <medication>: Moricizine
# <RR-low-limit(sec)>: 0.406,  <RR-high-limit(sec)>: 0.929
# Note: reel-to-reel recording, not flutter-compensated