7 lines (6 with data), 253 Bytes

e257b 0 128 0 13:05:00 20/01/1989
# Start time=13:05
# First beat=13:12:21.585
# <age-range>: 60-64, <sex>: Male, <medication>: Encainide
# <RR-low-limit(sec)>: 0.585,  <RR-high-limit(sec)>: 0.937
# Note: reel-to-reel recording, not flutter-compensated