7 lines (6 with data), 254 Bytes

m052b 0 128 0 10:00:00 24/01/1991
# Start time=10:00
# First beat=10:21:58.382
# <age-range>: 50-54, <sex>: Male, <medication>: Moricizine
# <RR-low-limit(sec)>: 0.468,  <RR-high-limit(sec)>: 0.945
# Note: reel-to-reel recording, not flutter-compensated