( ( If ( ( the swelling ) ( were ( from ( heart failure ) ) ) ) ) ( , ( it ( ( would ( have ( to ( be ( that ( ( ( ( ( her ( right ventricle ) ) , ) ( ( the chamber ) ( of ( ( the heart ) ( that ( ( pumps blood ) ( into ( the lungs ) ) ) ) ) ) ) ) , ) ( was failing ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (SBAR (IN If) (S (NP (DT the) (VBG swelling)) (VP (VBD were) (PP (IN from) (NP (NN heart) (NN failure)))))) (, ,) (NP (PRP it)) (VP (MD would) (VP (VB have) (S (VP (TO to) (VP (VB be) (SBAR (IN that) (S (NP (NP (PRP$ her) (JJ right) (NN ventricle)) (, ,) (NP (NP (DT the) (NN chamber)) (PP (IN of) (NP (NP (DT the) (NN heart)) (SBAR (WHNP (WDT that)) (S (VP (VBD pumps) (NP (NN blood)) (PP (IN into) (NP (DT the) (NNS lungs))))))))) (, ,)) (VP (VBD was) (VP (VBG failing)))))))))) (. .)))
If the swelling were from heart failure, it would have to be that her right ventricle, the chamber of the heart that pumps blood into the lungs, was failing.
(ROOT (S (NP (NP (NNP Blood)) (PP (IN from) (NP (DT the) (NN body)))) (VP (VBZ enters) (NP (NP (JJ right) (NN atrium)) (PP (IN of) (NP (DT the) (NN heart)))) (SBAR (IN before) (S (NP (PRP it)) (VP (VBZ is) (VP (VBN pumped) (PP (PP (TO to) (NP (DT the) (JJ right) (NN ventricle))) (CC and) (RB then) (PP (TO to) (NP (DT the) (NNS lungs))))))))) (. .)))