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Acute Pulmonary Embolism — Catheter-Directed Thrombolysis

Endovascular intervention for intermediate-high risk and selected high-risk pulmonary embolism using catheter-directed thrombolysis (CDT), ultrasound-assisted CDT (EKOS), and mechanical thrombectomy (FlowTriever, Inari) for rapid clot reduction with reduced bleeding risk.

Written by: Saygı Hospital Health Guide Editorial Board
Last updated:

This content has been compiled by the Saygı Hospital Health Guide Editorial Board and is periodically reviewed by a specialist physician.

References (5)

This content is for informational purposes only and does not constitute medical advice. You can book an appointment at our Göğüs Hastalıkları department. Book Appointment →

What is Acute Pulmonary Embolism — Catheter-Directed Thrombolysis?

Catheter-directed thrombolysis (CDT) and mechanical thrombectomy represent advanced endovascular interventions for acute pulmonary embolism (PE), bridging the gap between systemic anticoagulation alone and full-dose systemic thrombolysis. Indications include intermediate-high risk PE (submassive PE: hemodynamically stable with right ventricular dysfunction and elevated cardiac biomarkers) and selected high-risk PE (massive PE: hypotension/shock) with contraindications to systemic thrombolysis.

Standard CDT delivers low-dose thrombolytic agent (typically 24 mg tPA over 12-24 hours) through multi-side-hole pigtail catheter positioned within pulmonary artery thrombus. Ultrasound-assisted CDT (EKOS, EkoSonic Endovascular System) uses high-frequency, low-intensity ultrasound to disaggregate fibrin strands enhancing thrombolytic penetration, allowing reduced thrombolytic doses with comparable or improved efficacy. Mechanical thrombectomy systems (FlowTriever, Inari ClotTriever, Penumbra Indigo) extract thrombus without thrombolytic agents.

Outcomes show CDT reduces RV/LV ratio improvement faster than anticoagulation alone (SEATTLE-II, ULTIMA, OPTALYSE-PE trials), reduces pulmonary artery pressure, and may reduce mortality in intermediate-high risk PE with lower bleeding rates compared to systemic thrombolysis (HI-PEITHO, PEITHO trials). Multidisciplinary Pulmonary Embolism Response Teams (PERT) optimize patient selection by combining cardiology, pulmonology, vascular surgery, interventional radiology, and emergency medicine expertise.

Symptoms

Acute dyspnea (most common symptom, 73%)
Pleuritic chest pain (44%)
Cough, hemoptysis, syncope, presyncope
Tachypnea (>20/min), tachycardia (>100/min)
Hypoxemia (SpO2 <94% on room air)
Right ventricular strain on echocardiogram (RV dysfunction)
Hemodynamic instability: hypotension (SBP <90 mmHg), shock, cardiac arrest

Risk Factors

Recent surgery (orthopedic, abdominal, pelvic) within 8 weeks
Prolonged immobilization (hospitalization, long-distance travel)
Active cancer (especially adenocarcinoma, pancreatic, lung, brain)
Hypercoagulable disorders: Factor V Leiden, prothrombin mutation, antiphospholipid syndrome
Hormonal factors: oral contraceptives, hormone replacement therapy, pregnancy
Personal or family history of venous thromboembolism
Obesity (BMI >30), smoking, advanced age (>70 years)

When to See a Doctor?

If you experience any of the following symptoms, seek medical attention promptly:

  • Sudden onset dyspnea with chest pain (call emergency services)
  • Unexplained tachycardia and tachypnea
  • Hemoptysis with risk factors for VTE
  • Syncope or presyncope without explanation
  • Diagnosed PE with persistent hypotension or shock
  • Submassive PE with RV dysfunction for advanced therapy evaluation
  • Failed anticoagulation with worsening clinical status

Treatment Methods

01
Risk stratification: hemodynamics, CT pulmonary angiography clot burden, RV function on echo/CT, cardiac biomarkers (troponin, BNP)
02
Initial therapy: hemodynamic support (IV fluids cautiously, vasopressors for shock), supplemental oxygen, anticoagulation (heparin)
03
Multidisciplinary PERT (Pulmonary Embolism Response Team) consultation for risk stratification and treatment selection
04
Systemic thrombolysis (alteplase 100 mg IV over 2 hours) for high-risk PE without contraindications
05
Catheter-directed thrombolysis (CDT) for intermediate-high risk PE: standard CDT or ultrasound-assisted (EKOS) with low-dose tPA over 12-24 hours
06
Mechanical thrombectomy (FlowTriever, Inari, Penumbra) for thrombolytic contraindications, hemodynamic instability, or large clot burden
07
Long-term anticoagulation: DOAC (apixaban, rivaroxaban, dabigatran, edoxaban) or warfarin for 3-6 months minimum, longer for unprovoked or recurrent PE; outpatient PERT follow-up, IVC filter for selected cases

Which Department to Visit?

You can visit our Göğüs Hastalıkları department for these complaints. Our specialist physicians will create the most suitable treatment plan for you.

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Health Disclaimer: The information on this page is prepared for general informational purposes only. It does not replace medical diagnosis and treatment. Please consult your physician for your complaints. Saygı Hospital does not accept responsibility for actions taken based on the information on this page.