7 lines (6 with data), 253 Bytes

m057b 0 128 0 11:15:00 23/08/1990
# Start time=11:15
# First beat=11:29:52.875
# <age-range>: 55-59, <sex>: Male, <medication>: Moricizine
# <RR-low-limit(sec)>: 0.64,  <RR-high-limit(sec)>: 1.328
# Note: reel-to-reel recording, not flutter-compensated