Massive Saddle Pulmonary Embolus

A 64-year-old woman presents on postoperative day 7 following total hip arthroplasty with sudden onset severe dyspnea, pleuritic chest pain, near-syncope, and hypotension (BP 78/50). On examination she is tachypneic, tachycardic with cool extremities, loud P2, and elevated JVP. Bedside echocardiogram shows a dilated, hypokinetic right ventricle with septal flattening and McConnell's sign. CT pulmonary angiogram demonstrates the structure marked **A** in the diagram. Which of the following best describes the pathophysiological consequence of this finding?