Should You Proceed with Invasive Clot Removal or Continue Anticoagulation Alone?
Based on your current clinical stability—good oxygen levels, no shortness of breath, and hemodynamic stability—you should continue therapeutic anticoagulation and transition to oral blood thinners without invasive clot removal procedures. The radiologist and general doctor are giving you the most appropriate recommendation for your situation.
Understanding Your Risk Category
Your case represents what guidelines classify as intermediate-risk or submassive pulmonary embolism. Despite having large bilateral clots, the critical determining factor is your hemodynamic status 1. You are:
- Not in shock (blood pressure is stable)
- Not requiring vasopressor support
- Maintaining good oxygen saturation
- No longer experiencing severe shortness of breath
The 2019 European Society of Cardiology guidelines explicitly state: "Do not routinely administer systemic thrombolysis as primary treatment in patients with intermediate- or low-risk PE" 1. This directly applies to your situation.
Why Anticoagulation Alone Is Appropriate for You
Anticoagulation is the standard of care for hemodynamically stable patients with PE, regardless of clot size 1, 2, 3. The evidence shows:
- You've already been on therapeutic IV heparin successfully—your body is responding well
- The goal of anticoagulation is to prevent clot propagation and allow your body's natural fibrinolytic system to dissolve the clots over time
- Most patients with intermediate-risk PE do well with anticoagulation alone 4
The transition plan should be:
- Continue IV heparin until INR reaches 2.0-3.0 (if using warfarin) 5
- Overlap with oral anticoagulant for at least 5 days 5, 2
- Prefer a direct oral anticoagulant (DOAC) like apixaban, rivaroxaban, or edoxaban over warfarin 1, 3
- Continue anticoagulation for at least 3 months 1, 4
When Invasive Procedures ARE Indicated
Invasive clot removal (catheter-directed therapy or surgical embolectomy) is reserved for:
- Sustained hypotension (systolic BP <90 mmHg for >15 minutes)
- Cardiogenic shock
- Cardiac arrest
- Need for vasopressor support
OR intermediate-risk patients who deteriorate 7:
- Worsening respiratory status despite anticoagulation
- Hemodynamic decompensation
- Progressive right ventricular failure
You do not meet any of these criteria. Your clinical improvement on heparin demonstrates you are responding appropriately to conservative management.
The Pulmonologist's Perspective: A Common Pitfall
The head pulmonologist's recommendation for clot removal based solely on clot size represents a common clinical pitfall. While the clots are indeed large, clot burden alone does not dictate the need for invasive intervention 7, 4. The 2019 AHA Scientific Statement explicitly warns against this approach, emphasizing that treatment decisions must be based on hemodynamic status and risk of deterioration, not imaging findings alone 7.
Recent evidence shows that aggressive intervention in stable intermediate-risk patients does not improve long-term outcomes and increases bleeding risk 7, 4. The FLASH registry and other studies of catheter-directed therapy primarily enrolled patients with hemodynamic compromise or high-risk features—not stable patients like yourself 6.
What You Should Insist Upon
Discharge criteria 5:
- INR between 2.0-3.0 (if on warfarin) or appropriate DOAC dosing established
- Written information about anticoagulant therapy
- Clear follow-up plan with anticoagulation monitoring
- Understanding of bleeding precautions
Follow-up care 1:
- Re-evaluation at 3-6 months after acute PE
- Assessment for post-PE syndrome or chronic thromboembolic pulmonary hypertension
- Decision about duration of anticoagulation based on whether this was provoked (identifiable risk factor) or unprovoked
The Bottom Line
Your clinical stability is the most important prognostic factor, not the size of your clots. The fact that you're doing well on anticoagulation—with good oxygen levels and resolution of symptoms—indicates you are in the majority of PE patients who recover successfully with medical management alone 3, 4.
Invasive procedures carry real risks (bleeding, vascular injury, procedural complications) that are not justified when you're already improving 7. The general doctor and radiologist are correctly applying evidence-based guidelines to your specific clinical situation. The "middle ground" pulmonologist's uncertainty likely reflects the ongoing debate in the literature, but current guidelines are clear: stable patients should receive anticoagulation, not invasive intervention 1, 4.
Trust your clinical response—you're breathing well, your oxygen is good, and you're stable. That's what matters most.