A routine physical examination is performed on a 1-year-old male DSH cat that was recently adopted from the animal shelter. The examination is normal except for a loud holo-systolic murmur heard best at the left cardiac apex. This ECG is obtained (13; leads I, II, and III at 50 mm/s, 1 cm = 1 mV).
i. Identify the HR and rhythm.
ii. Are abnormalities of ECG complex size or configuration present? If so, what do they suggest?
iii. What are some potential differential diagnoses for the murmur, based on theinformation available?
