7 lines (6 with data), 246 Bytes

m175a 0 128 0 10:34:00 22/02/1990
# Start time=10:34
# First beat=10:35:53.203
# <age-range>: 55-59, <sex>: Male, <medication>: None
# <RR-low-limit(sec)>: 0.64,  <RR-high-limit(sec)>: 1.46
# Note: reel-to-reel recording, not flutter-compensated