7 lines (6 with data), 247 Bytes

m235a 0 128 0 10:35:00 16/07/1989
# Start time=10:35
# First beat=10:42:01.203
# <age-range>: 60-64, <sex>: Male, <medication>: None
# <RR-low-limit(sec)>: 0.445,  <RR-high-limit(sec)>: 1.21
# Note: reel-to-reel recording, not flutter-compensated