7 lines (6 with data), 254 Bytes

m173b 0 128 0 12:39:00 25/05/1990
# Start time=12:39
# First beat=12:39:49.125
# <age-range>: 55-59, <sex>: Male, <medication>: Moricizine
# <RR-low-limit(sec)>: 0.523,  <RR-high-limit(sec)>: 1.007
# Note: reel-to-reel recording, not flutter-compensated