7 lines (6 with data), 248 Bytes

m234a 0 128 0 15:05:00 14/07/1990
# Start time=15:05
# First beat=15:23:03.085
# <age-range>: 55-59, <sex>: Male, <medication>: None
# <RR-low-limit(sec)>: 0.601,  <RR-high-limit(sec)>: 1.421
# Note: reel-to-reel recording, not flutter-compensated