7 lines (6 with data), 253 Bytes

m133b 0 128 0 12:05:00 17/04/1991
# Start time=12:05
# First beat=12:18:05.234
# <age-range>: 60-64, <sex>: Male, <medication>: Moricizine
# <RR-low-limit(sec)>: 0.46,  <RR-high-limit(sec)>: 0.804
# Note: reel-to-reel recording, not flutter-compensated