7 lines (6 with data), 248 Bytes

m242a 0 128 0 10:50:00 11/04/1990
# Start time=10:50
# First beat=11:09:39.492
# <age-range>: 55-59, <sex>: Male, <medication>: None
# <RR-low-limit(sec)>: 0.546,  <RR-high-limit(sec)>: 0.968
# Note: reel-to-reel recording, not flutter-compensated