7 lines (6 with data), 253 Bytes

m178b 0 128 0 13:50:00 11/04/1991
# Start time=13:50
# First beat=13:50:00.148
# <age-range>: 45-49, <sex>: Male, <medication>: Moricizine
# <RR-low-limit(sec)>: 0.46,  <RR-high-limit(sec)>: 0.898
# Note: reel-to-reel recording, not flutter-compensated