🫁 Massive vs Submassive vs Low-Risk PE Classification Simulator

CT Pulmonary Angiography Confirms the Clot

Contrast CT locates the embolus and starts the severity workup.

• CTPA: First-line imaging (fast, widely available scan)
• ~95%: Sensitivity (for segmental-and-larger clots)
• V/Q scan: Alternative test (used when contrast contraindicated)
• Main/lobar/segmental: Clot location (affects downstream risk)

Why imaging comes first

Placeholder: confirms diagnosis before any severity grading begins.

What the scan cannot tell you

Placeholder: clot size alone does not predict hemodynamic outcome.

Sustained Hypotension Defines the Massive Category

Blood pressure and shock signs split massive PE from everything else.

• SBP <90: Massive threshold (sustained 15+ minutes)
• ~30–50%: Massive PE mortality (without prompt reperfusion)
• ~5%: Massive PE incidence (of all diagnosed PE cases)
• Cool skin, syncope: Shock signs (support the diagnosis)

Defining sustained hypotension

Placeholder: shock or pressor need marks the massive branch.

Why this split happens first

Placeholder: unstable patients skip straight to thrombolysis pathway.

RV Dilation and Hypokinesis Signal Submassive Risk

Echo or CT reveals whether the right ventricle is straining.

• >0.9: RV/LV ratio cutoff (on CT or echo view)
• ~25%: RV dysfunction found (of hemodynamically stable PE)
• Apex-sparing: McConnell sign (hypokinesis pattern on echo)
• ~3–15%: Submassive mortality (higher than low-risk group)

Reading the strained ventricle

Placeholder: dilation and free-wall hypokinesis mark RV strain.

Why RV status matters

Placeholder: RV failure predicts deterioration even if BP is normal.

Troponin and BNP Corroborate RV Strain

Elevated cardiac biomarkers confirm strain seen on imaging.

• Present: Troponin elevation (reflects RV myocyte stress)
• Present: BNP elevation (reflects RV wall tension)
• Higher risk: Both markers positive (strengthens submassive call)
• Reassuring: Both markers normal (supports low-risk category)

What biomarkers add

Placeholder: labs confirm imaging findings, refine risk further.

Combining imaging and labs

Placeholder: either finding alone can still flag submassive risk.

Three Classes, Three Treatment Intensities

Massive, submassive, or low-risk each route to different care.

• Thrombolysis: Massive (or catheter/surgical intervention)
• Monitor closely: Submassive (anticoagulation ± escalation)
• Anticoagulation: Low-risk (standard outpatient-eligible course)
• Ongoing: Reclassification (status can worsen over hours)

Treatment intensity follows class

Placeholder: higher-risk classes get more aggressive intervention.

Reassessment matters

Placeholder: stable patients can still decompensate and reclassify.

Placeholder: classification is a snapshot, not a one-time verdict.