EKOS failure with INARI salvage in massive pulmonary embolism: a literature review and case report

Pulmonary embolism (PE) is the third most common cause of cardiovascular mortality and presents a significant challenge in acute care settings. EkoSonic Endovascular System (EKOS) (ultrasound assisted catheter directed thrombolysis) and suction thrombectomy have emerged as key treatment options for high and intermediate risk PE. EKOS delivers localized fibrinolytic therapy, whereas thrombectomy provides definitive clot removal using devices such as the FlowTriever System (Inari Medical). However, the optimal treatment strategy, particularly in recurrent PE, remains uncertain. We report a case requiring escalation of therapy from EKOS to suction thrombectomy due to recurrent PE and worsening hemodynamic status despite initial thrombolysis. The patient was initially treated with EKOS for a saddle PE but was rehospitalized with syncope and persistent right ventricular (RV) strain. Given the inadequate response to thrombolysis, suction thrombectomy was performed, leading to marked improvement in RV function and overall clinical status. This case underscores the importance of individualized management and timely escalation when initial therapy is insufficient. Assessment of therapeutic success should include not only symptomatic relief but also resolution of clot burden and RV recovery. A focused literature review comparing EKOS and suction thrombectomy suggests that while both modalities are viable, suction thrombectomy may offer faster hemodynamic improvement in select patients. However, available data remains limited, highlighting the need for further comparative studies. Overall, this case and review support a tailored, multidisciplinary approach to PE management, emphasizing shared decision making and early escalation in patients with clinical deterioration despite initial intervention.