7 lines (6 with data), 254 Bytes

m271b 0 128 0 10:18:00 15/04/1990
# Start time=10:18
# First beat=10:38:52.140
# <age-range>: 70-74, <sex>: Male, <medication>: Moricizine
# <RR-low-limit(sec)>: 0.757,  <RR-high-limit(sec)>: 1.367
# Note: reel-to-reel recording, not flutter-compensated