Management of Pulmonary Embolism with Right Heart Strain on Echocardiography

Risk Stratification Based on RV Dysfunction

The European Society of Cardiology recommends that patients with pulmonary embolism and echocardiographic evidence of right ventricular dysfunction should be classified as intermediate-risk (submassive) PE and require immediate therapeutic anticoagulation with consideration for escalation to reperfusion therapy based on hemodynamic status 1, 2
The presence of right ventricular strain on echocardiography fundamentally changes PE risk classification and management strategy, with normotensive patients with confirmed PE and RV hypokinesis on echocardiography being classified as submassive (intermediate-risk) PE 3, 2
RV dysfunction is found in at least 25% of PE patients, and its detection by echocardiography or CT is essential for risk stratification 1
Early and late mortality is significantly higher in patients with moderate to severe RV dysfunction compared to those with normal RV function 3, 2

The European Heart Association recommends that high-risk PE (shock or persistent hypotension) requires emergency reperfusion 1, 4
In hemodynamically compromised patients with suspected PE, unequivocal echocardiographic signs of RV pressure overload and dysfunction justify emergency reperfusion treatment even if immediate CT angiography is not feasible 1
Hemodynamically stable patients with RV dysfunction on echo represent intermediate-risk PE and require close monitoring with consideration for escalated therapy 3, 2

The American College of Chest Physicians recommends that unfractionated heparin (UFH) is preferred initially in patients with RV dysfunction due to its short half-life and reversibility, especially if more invasive interventions might be needed 5, 4
Low molecular weight heparin (LMWH) such as enoxaparin is an alternative for hemodynamically stable patients, but UFH allows more rapid reversal if bleeding occurs or procedures are needed 4

Systemic thrombolysis is first-line treatment if no absolute contraindications exist for high-risk PE (hemodynamically unstable) 1, 5
The decision for reperfusion therapy in intermediate-risk PE (normotensive with RV dysfunction) is more nuanced and requires careful assessment, with thrombolytic therapy not being routinely used in normotensive patients with RV dysfunction 1, 2

The presence of mobile right heart thrombi represents a life-threatening emergency requiring immediate intervention, with mortality reaching 80-100% when left untreated with anticoagulation alone 7, 5
Treatment options for mobile right heart thrombi include systemic thrombolysis, surgical embolectomy, and catheter-directed interventions, with heparin alone being insufficient even in otherwise clinically stable patients 7, 5

Key echocardiographic parameters that define RV strain include RV dilation with RV/LV diameter ratio >0.6, RV hypokinesis, and interventricular septal flattening or paradoxical motion (D-shaped LV) 1, 3
The McConnell sign (RV free wall hypokinesis with apical sparing) has 77% sensitivity and 94% specificity for acute PE 1, 3

Intensive monitoring is required for all patients with RV dysfunction, including continuous vital signs, oxygen saturation, and hemodynamic monitoring, as well as serial echocardiographic assessments to monitor RV function and guide escalation decisions 5, 6
Transition to oral anticoagulation (preferably NOACs) once stabilized, continuing for minimum 3-6 months, and mandatory clinical evaluation at 3-6 months post-PE to assess for persistent symptoms and screen for chronic thromboembolic pulmonary hypertension (CTEPH) 6