7 lines (6 with data), 247 Bytes

m231a 0 128 0 8:10:00 08/07/1990
# Start time=08:10
# First beat=08:33:00.226
# <age-range>: 60-64, <sex>: Male, <medication>: None
# <RR-low-limit(sec)>: 0.617,  <RR-high-limit(sec)>: 1.203
# Note: reel-to-reel recording, not flutter-compensated