7 lines (6 with data), 248 Bytes

m288a 0 128 0 15:00:00 30/06/1990
# Start time=15:00
# First beat=15:11:21.203
# <age-range>: 70-74, <sex>: Male, <medication>: None
# <RR-low-limit(sec)>: 0.484,  <RR-high-limit(sec)>: 1.062
# Note: reel-to-reel recording, not flutter-compensated