Simplified Pulmonary Embolism Severity Index (sPESI)

Six binary items (1 point each; maximum 6). Total 0 suggests low short-term risk in validation cohorts; ≥1 indicates higher risk (Jiménez et al., Eur Heart J 2010).

Age (years) *

>80 years adds 1 point

Comorbidity

History of cancer (+1 point)Chronic heart failure and/or chronic lung disease (+1 point)

Vital signs

Optional fields left blank count as 0 points for that criterion (may underestimate risk).

Heart rate (beats/min)

≥110 adds 1 point

Systolic BP (mmHg)

<100 mmHg adds 1 point

Oxyhemoglobin saturation (%)

<90% adds 1 point

Disclaimer: For education only. sPESI supports risk stratification after acute pulmonary embolism; it does not replace guidelines, hemodynamic assessment, imaging, laboratory data, or anticoagulation safety evaluation.

Simplified PESI (sPESI) — criteria and interpretation

Overview

The simplified Pulmonary Embolism Severity Index retains six prognostic variables from the original PESI, each scored as 1 point if present and 0 if absent, for a total from 0 to 6. It was designed to stratify 30-day outcome after acute PE without summing weighted continuous scores. Primary reference: Jiménez D et al., European Heart Journal 2010;31(4):517–522. DOI 10.1093/eurheartj/ehp557. Educational summaries also appear on tools such as MDCalc.

Binary scoring (1 point each)

Criterion	Definition	Points
Age	Greater than 80 years	1
Cancer	History of cancer (active or treated, per original cohort coding)	1
Cardiopulmonary disease	Chronic heart failure and/or chronic lung disease	1
Tachycardia	Heart rate ≥110 beats/min	1
Hypotension	Systolic blood pressure <100 mmHg	1
Hypoxemia	Arterial oxyhemoglobin saturation <90%	1

Variables not listed (e.g. male sex, respiratory rate, temperature, altered mental status) are not part of sPESI; they appear in the full PESI.

Interpretation

sPESI = 0: low-risk group in the original model—low short-term mortality compared with sPESI ≥1.
sPESI ≥1: not low risk; higher observed mortality in validation sets—generally managed as higher acuity unless guideline-based early-discharge criteria are met.
Use with confirmed PE (or PE-equivalent management context), bleeding risk, renal function, hemodynamic status, right ventricular dysfunction imaging, troponin/BNP when indicated, and health system resources.

Vital signs and data entry

Saturation should reflect the same modality used in your pathway (room air vs supplemental oxygen, arterial gas vs pulse oximetry). If a vital is omitted in this calculator, that criterion is treated as not met (0 points), which may underestimate risk—enter all available measurements when possible.

Background and purpose

Acute pulmonary embolism (PE) spans a wide spectrum of illness. Some patients remain hemodynamically stable with minimal physiologic stress, while others deteriorate from right ventricular overload, hypoxemia, or concurrent cardiopulmonary disease. Risk stratification after PE is used to estimate short-term adverse outcomes (notably early mortality and complications), to align intensity of monitoring, and to support thoughtful decisions about site of care when anticoagulation and follow-up can be delivered safely.

The original Pulmonary Embolism Severity Index (PESI) aggregates multiple weighted factors—including age, sex, comorbidity, vital signs, mental status, and oxygenation—into a single continuous score mapped to risk classes. While well studied, full PESI requires several data elements and arithmetic that can be cumbersome at the bedside. The simplified PESI (sPESI) was developed to preserve much of the prognostic information of PESI with a compact rule: six binary “yes or no” criteria, each contributing one point when present, for a total score from zero to six.

How sPESI relates to full PESI

sPESI is not a separate disease model in isolation; it deliberately repackages a subset of the strongest prognostic themes embedded in the original PESI framework. Items that are not part of sPESI—such as male sex, respiratory rate thresholds, temperature abnormalities, and altered mental status—were omitted in the simplified schema. Clinicians should therefore avoid mixing full PESI point weights with sPESI logic, and should not assume the two scores are interchangeable numerically. When documentation or pathways specify one instrument, use that instrument consistently.

The six criteria (one point each)

Each of the following contributes exactly one point if the condition is met, and zero if not. The maximum total is six.

Age greater than 80 years

Advanced age is a durable marker of vulnerability after acute PE, reflecting reduced cardiopulmonary reserve, comorbidity burden, and frailty-related risk. In sPESI, age is treated as a dichotomy rather than the year-by-year accumulation used in full PESI. In practice, ensure the recorded age matches the same moment of assessment as vitals and history (for example, emergency department presentation versus hospital day two).

History of cancer

Active or prior malignancy identifies patients with differing thrombotic biology, treatment interactions, bleeding considerations, and overall prognosis. Operational definitions of “cancer” in cohort studies may differ from daily charting; for bedside use, the intent is to capture clinically relevant oncologic history that plausibly modifies PE outcome risk, including need for nuanced anticoagulation choices and surveillance planning.

Chronic heart failure and/or chronic lung disease

This item groups chronic cardiopulmonary conditions that limit the ability to compensate for acute right heart afterload and ventilation–perfusion imbalance. Either heart failure or chronic lung disease satisfies the criterion once; both need not be present to assign the point, but only one point total is awarded for this domain. Asthma, chronic obstructive pulmonary disease, interstitial lung disease, and chronic hypoxemic respiratory disorders are typical examples when they are longstanding and clinically significant; correlate with charted diagnoses and objective history rather than a single abnormal vital sign in isolation.

Heart rate ≥110 beats per minute

Tachycardia is a readily available marker of sympathetic drive and hemodynamic stress. It may reflect pain, anxiety, fever, anemia, sepsis, or arrhythmia as well as PE-related physiology. Interpret the heart rate in clinical context, using the value that best represents the patient’s baseline risk state at the time PE severity is being assessed (for example, after initial stabilization and analgesia when feasible). Persistent tachycardia despite therapy may signal higher acuity even within the same numeric score bucket.

Systolic blood pressure <100 mmHg

Systemic hypotension raises concern for compromised cardiac output and right ventricular dysfunction in the setting of embolic burden and pre-existing cardiopulmonary disease. Borderline values should be interpreted with repeat measurements, patient posture, cuff size, arrhythmia, and medication effects. Notably, hypotension may also prompt evaluation for high-risk (massive) PE pathways and interventions that go beyond what any severity index alone can capture.

Arterial oxyhemoglobin saturation <90%

Hypoxemia reflects ventilation–perfusion mismatch, shunt physiology, underlying lung disease, or inadequate oxygen delivery. The measured saturation should be interpreted with attention to whether the patient is on room air or supplemental oxygen, altitude, probe quality, carbon monoxide exposure, and whether the value is from pulse oximetry or arterial blood gas correlation. Consistency with institutional pathways matters: some workflows emphasize room-air saturation, while others document best available oxygenation at assessment—align data entry with the standard you intend to defend clinically.

Score interpretation in practice

In the original sPESI conceptualization, patients with zero points clustered into a lower short-term mortality risk stratum compared with those with one or more points. This dichotomy is sometimes described as “low risk” versus “not low risk,” rather than as fine-grained staging across the integers one through six. Higher totals generally imply accumulating physiologic and comorbid burden, but the validated bedside utility emphasized the zero-versus-nonzero split for many management discussions.

Any severity score must be applied only after PE is appropriately diagnosed (or managed under a coherent diagnostic strategy), anticoagulation candidacy is considered, and contraindications and bleeding risk are reviewed. sPESI does not replace assessment for right ventricular strain on imaging, cardiac biomarkers when indicated, renal function, anemia, infection, or the social determinants that influence safe outpatient management.

Site of care and escalation considerations

Low sPESI scores have been discussed in the literature in connection with selected stable patients who might be considered for early discharge or outpatient-oriented pathways when combined with normal biomarkers, acceptable imaging of right ventricular function, reliable anticoagulation access, and close follow-up. Conversely, sPESI ≥1 should lower the threshold for inpatient observation, telemetry, repeat clinical reassessment, and specialist consultation, especially when any single high-risk feature is dynamic (worsening hypoxemia, rising troponin, escalating oxygen requirement, or evolving hypotension).

Hemodynamic shock, sustained hypotension, or other markers of massive or high-risk PE may mandate pathways that do not depend on sPESI alone. Similarly, major bleeding risk, severe renal impairment, pregnancy, active malignancy with treatment constraints, or limited support at home can override a favorable numeric score.

Documentation, communication, and limitations

When recording sPESI, note which vitals and historical elements were used, the timing of assessment, and whether supplemental oxygen was applied—this improves auditability and handoffs. Because omitted or delayed measurements can make a criterion falsely appear “absent,” incomplete data entry can underestimate risk if users treat missing vitals as negative criteria.

sPESI was derived and validated in specific populations and eras of PE care; performance may vary with case mix, imaging practices, early therapy intensity, and regional admission norms. It is an adjunct to, not a substitute for, clinical reasoning, shared decision-making, and current guideline recommendations.

CalcMD.

Simplified PESI (Pulmonary Embolism Severity Index)

Use the simplified Pulmonary Embolism Severity Index (sPESI): six binary factors (0–6) for short-term risk after PE. Score 0 suggests low risk; ≥1 suggests higher risk—support tool only, not a substitute for full clinical assessment.