7 lines (6 with data), 253 Bytes

m242b 0 128 0 11:30:00 18/05/1990
# Start time=11:30
# First beat=11:54:45.046
# <age-range>: 55-59, <sex>: Male, <medication>: Moricizine
# <RR-low-limit(sec)>: 0.625,  <RR-high-limit(sec)>: 1.21
# Note: reel-to-reel recording, not flutter-compensated