Table 2.

Number and percentage of dogs with elevated systolic pulmonary artery pressure estimated from peak tricuspid regurgitation velocity

Peak Systolic TR Velocity (m/s) Used to Designate Severity of Estimated Systolic Pulmonary Hypertension	Group 1: Asymptomatic No Heart Disease	Group 2: Asymptomatic Heart Disease	Group 3: Respiratory Distress, Primary Respiratory, or Airway Disease	Group 4: Respiratory Distress, Congestive Heart Failure
2.8–3.5 (mild)	0	12 (14.8)	15 (14.4)	20 (27)
>3.5–4.3 (moderate)		1 (1.2)	18 (17.3)	7 (9.5)
>4.3 (severe)		1 (1.2)	9 (8.6)	9 (12.2)