Radiographic Pointers for Cardio Megaly Radiographic Identification of the Cardiac Chambers: Clockface Analogy

Compiled by Dr Liesel van der Merwe.

Images courtesy Dr Lynelle Sweers

 Dorsoventral view

11:00 – 01:00 : aortic arch

01:00 – 02:00 : main pulmonary artery

02:30 – 03:00 : left auricle

05:00 – 09:00 : right ventricle

09:00 – 11:00 : right atrium

 

Figure 1: DV view of the normal cardiac silhouette

Lateral view

12:00 – 02:00 : left atrium

02:00 – 05:00 : left Ventricle

05:00 – 09:00 : right ventricle

09:00 – 10:00 : main pulmonary artery & right auricle

10:00 – 11:00 : aortic arch

Figure 2: Lateral view of the normal cardiac silhouette

KEY: A=Aorta; LA = Left atrium; LAu = Left auricle; LV = Left Ventricle; MPA = Main pulmonary artery; RA = Right atrium; RAu = Right auricle; RV = Right ventricle.

SOURCE: BSAVA Manual of Canine and Feline Thoracic Imaging. Eds: Toias Schwartz, Victoria Johnson, 2008