The objective of this retrospective study was to distinguish between dogs with pulmonary hypertension (PH) and non-PH by using parameters obtained from thoracic radiographs. Data of 72 dogs of small breeds aged more than 1 year old and weighing less than 10 kg were retrieved. Echocardiography was used as a gold standard to diagnose PH and separate the dogs into two groups: PH (n=15) and non-PH (n=57). Seven formulae were created from measurements on right lateral and ventrodorsal radiographic views. Five formulae from the ventrodorsal view provided an outcome that could differentiate PH and non-PH dogs. Two formulae are recommended including 1) the ratio of the area of the pulmonary artery crossing the 9th rib and the area of the 9th thoracic vertebra (areaPA/areaT9) (cut-off >0.08; sensitivity of 83% and specificity of 89.4%) and 2) the ratio of the width of the pulmonary artery crossing the 9th rib and the width of the 9th thoracic vertebra (widthPA/widthT9) (cut-off >0.3; sensitivity of 83.3% and specificity of 78.9%). Both measurement criteria provided high negative predictive values with moderate positive predictive values. In conclusion, these two new formulae can be used as a screening tool for distinguishing between PH and non-PH in dogs.
Chanroon, Kawinthip; Tuntipas, Thanat; Sukpanich, Promsin; Punyarit, Pawit; and Surachetpong, Sirilak Disatian
"Novel methods to diagnose pulmonary hypertension in dogs assessed by thoracic radiography,"
The Thai Journal of Veterinary Medicine: Vol. 48:
3, Article 8.
Available at: https://digital.car.chula.ac.th/tjvm/vol48/iss3/8