7 lines (6 with data), 254 Bytes

m230b 0 128 0 12:20:00 30/03/1991
# Start time=12:20
# First beat=12:26:36.648
# <age-range>: 65-69, <sex>: Male, <medication>: Moricizine
# <RR-low-limit(sec)>: 0.585,  <RR-high-limit(sec)>: 1.078
# Note: reel-to-reel recording, not flutter-compensated