7 lines (6 with data), 253 Bytes

m153b 0 128 0 10:00:00 17/01/1991
# Start time=10:00
# First beat=10:04:09.046
# <age-range>: 60-64, <sex>: Male, <medication>: Moricizine
# <RR-low-limit(sec)>: 0.25,  <RR-high-limit(sec)>: 0.781
# Note: reel-to-reel recording, not flutter-compensated