7 lines (6 with data), 248 Bytes

m156a 0 128 0 14:30:00 16/03/1989
# Start time=14:30
# First beat=14:42:25.125
# <age-range>: 60-64, <sex>: Male, <medication>: None
# <RR-low-limit(sec)>: 0.492,  <RR-high-limit(sec)>: 1.132
# Note: reel-to-reel recording, not flutter-compensated