Pleuritic Chest Pain and Breathlessness After Immobilization

Learning objectives#

• Build a pulmonary embolism diagnostic pathway from pretest probability rather than from an isolated risk factor or D-dimer result.
• Distinguish PERC, age-adjusted D-dimer, clinical-probability-adjusted D-dimer, and direct imaging by their intended populations.
• Assess hemodynamics, oxygenation, right-ventricular strain, biomarkers, bleeding risk, and practical context after PE is confirmed.
• Explain why diagnostic probability, early severity, and suitability for home treatment are three separate decisions.
• Plan anticoagulation, escalation, transitions, prevention, and follow-up without losing ownership at discharge.

Initial presentation#

The analysis opens with Marisol, a 61-year-old restaurant manager who comes to the emergency department with right-sided chest pain and shortness of breath. Eleven days earlier she sustained a closed left ankle fracture after missing a step. Orthopedics treated it without surgery in a below-knee immobilization device and instructed her to avoid weight bearing until follow-up. She has spent most of the interval on a sofa because her apartment has stairs and crutches feel unstable.

The previous evening, Marisol noticed a pulling ache in the left calf that she attributed to the brace. At 4:30 this morning she awoke with sharp pain along the right lower chest. It worsens with a deep breath and cough. Walking to the bathroom made her unusually breathless and lightheaded. She did not faint. There is no fever, sputum, recent respiratory infection, central pressure, jaw or arm pain, vomiting, or trauma to the chest. She has coughed twice without blood.

Her history includes hypertension and type 2 diabetes. She has no prior venous thromboembolism, known cancer, chronic lung disease, heart failure, or major bleeding. She does not take estrogen or an anticoagulant. Her mother had a postoperative leg clot in her seventies. Marisol has never had thrombophilia testing. She stopped smoking eight years ago. She has used a nonprescription anti-inflammatory medicine for ankle pain and has eaten less because reaching the kitchen is difficult.

At triage, Marisol is alert and speaks in full sentences but pauses after walking. Pulse is 112 per minute, respiratory rate 24, oxygen saturation 91 percent on room air, and blood pressure 108/68 mm Hg. Temperature is normal. Repeat values are similar. The right chest is tender only slightly and not in a pattern that reproduces the full pain. Breath sounds are present bilaterally without a focal wheeze. Heart rhythm is regular and rapid. The left calf is visibly larger than the right above the brace and is tender posteriorly. The foot is warm with intact sensation and perfusion. There is no major external bleeding.

Oxygen is provided for hypoxemia while the team evaluates airway, breathing, circulation, and mental status. Intravenous access, continuous monitoring, electrocardiography, and rapid bedside reassessment occur in parallel. Recent immobilization is important, but the team does not label the diagnosis before excluding competing emergencies.

Problem representation#

This is a 61-year-old adult with recent lower-limb fracture, marked reduction in mobility, and unilateral calf symptoms who now has acute pleuritic chest pain, exertional dyspnea, tachycardia, tachypnea, and hypoxemia. Blood pressure is lower than her usual clinic values but currently supports mentation and peripheral perfusion. There is no fever or convincing alternative explanation on initial examination.

Pulmonary embolism arising from lower-extremity deep-vein thrombosis is the leading diagnosis. The immediate priorities are to detect cardiopulmonary instability, establish a pretest probability, select imaging without an inappropriate rule-out shortcut, and begin treatment promptly once the diagnostic and bleeding context supports it. A second, distinct task follows confirmation: classify early severity and determine whether Marisol needs monitored admission, critical care, advanced therapy, or could ever meet a low-risk outpatient pathway.

The fracture and immobility are reversible risk factors, not proof of causation and not evidence that Marisol or the orthopedic team failed. Thromboembolism can occur despite appropriate instructions, and prophylaxis decisions for isolated lower-limb injury vary with the person, injury, mobility, and health system.

Prioritized differential#

Acute pulmonary embolism with lower-extremity deep-vein thrombosis#

The combined pattern is highly concerning: reduced mobility after lower-limb injury, unilateral calf swelling, pleuritic pain, dyspnea, tachycardia, and hypoxemia. PE can occur without hemoptysis or hypotension. Examination cannot determine clot burden or right-heart effect. The suspected leg source also matters if chest imaging is delayed or contraindicated, although a positive leg ultrasound does not quantify pulmonary severity.

Acute coronary syndrome#

Pleuritic pain is less typical for myocardial ischemia, but age, diabetes, and hypertension prevent dismissal. PE itself can cause troponin elevation and electrocardiographic abnormalities through right-ventricular strain. Serial electrocardiography, symptoms, and cardiac biomarkers must therefore be interpreted in context rather than forcing a false choice between cardiac and pulmonary disease.

Pneumonia, pleuritis, or viral respiratory infection#

Fever, cough, focal crackles, infiltrate, or infectious exposure would increase this probability. Early pneumonia can be subtle, and chest radiography can identify infiltrate, pneumothorax, effusion, or another explanation, but a normal film does not exclude PE. Antibiotics are not started solely for pleuritic pain without evidence supporting infection.

Pneumothorax or hemothorax#

Sudden pleuritic pain and dyspnea can reflect pneumothorax. Symmetric breath sounds do not fully exclude a small event, while absent sounds, hemodynamic compromise, or ultrasound findings could identify a tension emergency requiring treatment before CT. There is no chest trauma or anticoagulation to suggest hemothorax, but imaging addresses both alternatives.

Acute aortic syndrome or pericarditis#

Abrupt tearing pain, pulse difference, neurologic findings, aortic regurgitation, or characteristic imaging would raise aortic concern. Positional pain, diffuse electrocardiographic changes, or pericardial effusion would support pericarditis. Neither pattern leads, but both influence test interpretation and anticoagulation safety.

Musculoskeletal pain related to crutch use#

Chest-wall strain is plausible after days of crutches and can be pleuritic. It does not explain hypoxemia, persistent tachycardia, lightheadedness, and unilateral calf enlargement. Reproducible tenderness can coexist with PE and should not become a premature stopping rule.

Other causes of dyspnea and tachycardia#

Heart failure, dysrhythmia, anemia, metabolic disturbance, anxiety, and medication effects are conditional alternatives. Anxiety can amplify breathlessness but cannot safely account for new objective hypoxemia. A diagnostic plan addresses physiology first and revisits anxiety only after dangerous causes are proportionately assessed.

Focused history and examination#

The clinician defines symptom onset, maximal intensity, exertional limitation, syncope, hemoptysis, fever, cough, palpitations, leg pain, and trajectory. A true syncopal event, persistent hypotension, altered mentation, severe hypoxemia, or rapidly increasing oxygen need would signal a higher-risk state. Prior pain medicines may mask fever or affect bleeding and kidney risk.

Venous-thromboembolism history includes prior DVT or PE, recent surgery, trauma, hospitalization, immobility, long travel, cancer, pregnancy or postpartum state, estrogen exposure, inflammatory illness, infection, central venous devices, nephrotic syndrome, and known thrombophilia. Family history records the relative, age, provoking context, and recurrence rather than treating any family clot as inherited thrombophilia.

Bleeding assessment occurs before anticoagulation but does not create avoidable delay. It covers active bleeding, recent intracranial or gastrointestinal hemorrhage, stroke, major surgery, head injury, liver and kidney disease, low platelets, uncontrolled hypertension, falls, interacting medicines, and the exact fracture plan. Marisol's over-the-counter product is identified, and her baseline blood count and kidney function are sought.

Examination repeats vital signs and perfusion, includes mental state, work of breathing, neck veins, heart, lungs, chest wall, abdomen, skin, and both legs. The immobilization device is handled with attention to fracture stability and neurovascular status. Calf circumference and tenderness can support DVT assessment but do not diagnose it. Point-of-care cardiac and lung ultrasound may identify right-heart strain, effusion, pneumothorax, or another emergency in skilled hands; a normal bedside scan cannot independently exclude PE.

The clinician also asks what home treatment would mean if the diagnosis proved low risk. Marisol lives alone on a third floor, cannot bear weight, has limited paid leave, and uses a pharmacy that closes early. These facts do not change whether a clot is present, but they can change whether a medically eligible outpatient plan is safe.

Diagnostic strategy#

The team first estimates clinical probability using an accepted pathway. PERC is not appropriate because Marisol is not in a very-low-risk population and has multiple positive criteria, including age, tachycardia, hypoxemia, and unilateral leg findings. A negative result is impossible, and counting criteria would add no value. PERC should only follow a clinician's low-probability assessment, not create that assessment after the fact.

Marisol's features make PE likely under a two-level Wells approach. In a high-probability presentation, a negative D-dimer is not used as the sole exclusion test. The team proceeds to pulmonary vascular imaging while assessing whether anticoagulation should begin before imaging based on delay, bleeding risk, and current protocol. NICE guidance supports immediate CT pulmonary angiography for likely PE when feasible and interim therapeutic anticoagulation if definitive imaging cannot occur promptly and bleeding risk permits.

In lower-probability alternatives, a high-sensitivity D-dimer can safely avoid imaging when negative within a validated strategy. Fixed thresholds are not the only evidence-based option. Age-adjusted thresholds improve specificity in older adults, and YEARS or PEGeD adjust the threshold by clinical probability features. These strategies must be selected before viewing the result, matched to the correct assay units, and used as complete algorithms. Mixing the most permissive element of several rules is unsafe.

CT pulmonary angiography is appropriate here because it can confirm emboli and show central location, lung findings, and CT signs of right-heart strain. Kidney function, contrast reaction history, pregnancy status when relevant, and image quality are considered. If iodinated contrast were unsuitable, ventilation-perfusion imaging could be an alternative, especially with a sufficiently interpretable chest radiograph. Compression ultrasound could establish proximal DVT and support treatment when pulmonary imaging is delayed or impossible, but it would not fully characterize cardiopulmonary severity.

Initial laboratory work includes blood count, kidney and liver measures, electrolytes, coagulation measures as locally appropriate, cardiac troponin, and natriuretic peptide when used for confirmed-PE risk assessment. Lactate is measured in a patient with more than low-risk features under the 2026 guideline framework. Blood gas testing is selective and does not diagnose or exclude PE. A chest radiograph and electrocardiogram assess alternatives and consequences, not clot presence.

Progressive results and interpretation#

Electrocardiography shows sinus tachycardia without ST-elevation. Chest radiography shows no pneumothorax or focal infiltrate. Hemoglobin and platelets are adequate for treatment, and kidney function permits contrast imaging. Troponin is mildly elevated, natriuretic peptide is elevated, and lactate is normal. These biomarkers are not diagnostic by themselves; in confirmed PE they help describe myocardial stress and short-term risk.

CT pulmonary angiography demonstrates emboli in both main pulmonary arteries extending into lobar and segmental branches. There is enlargement of the right ventricle relative to the left and contrast reflux compatible with right-heart strain. A small peripheral opacity could represent pulmonary infarction and fits the pleuritic pain. There is no aortic dissection, pneumothorax, or large pneumonia.

Bedside echocardiography followed by formal echocardiography confirms right-ventricular dilation with reduced systolic function. Marisol remains alert with systolic pressure above the shock range, but she requires supplemental oxygen and has persistent tachycardia. Compression ultrasound identifies an acute proximal DVT in the left leg. The combined findings establish PE with right-ventricular dysfunction and myocardial injury markers, not a low-risk clot suitable for automatic discharge.

The team uses the 2026 AHA and ACC clinical-category framework and a validated severity tool as supports, while emphasizing trajectory. Marisol has symptomatic PE with elevated clinical severity, hypoxemia, RV strain, and biomarker abnormality. She is admitted to a monitored setting. The absence of sustained hypotension means routine systemic thrombolysis would expose her to bleeding risk without an established benefit appropriate to every patient in this category.

Two hours later, her pressure falls briefly after returning from imaging, but improves with positioning and a carefully judged small fluid intervention. There is no loss of consciousness, rising lactate, or escalating oxygen need. The pulmonary embolism response team discusses her trajectory, fracture, bleeding risk, and available rescue options. Because she stabilizes and shows no cardiopulmonary failure, anticoagulation and close monitoring continue without immediate reperfusion procedure. The plan defines what change would trigger renewed advanced-therapy assessment.

Management plan#

Immediate stabilization and anticoagulation#

Oxygen is titrated to clinical need. Monitoring tracks blood pressure, pulse, oxygen requirement, mental state, urine output, chest symptoms, and signs of bleeding. Large empiric fluid volumes are avoided because an overloaded right ventricle can worsen, while a cautious intervention may be appropriate in selected preload-sensitive patients. Vasopressor and critical-care support are available if shock develops.

Therapeutic anticoagulation is the main treatment. Agent selection considers hemodynamic stability, kidney and liver function, body size, pregnancy, cancer, antiphospholipid syndrome, interacting medicines, adherence, cost, reversibility needs, and whether a procedure may be required. A rapidly adjustable parenteral agent may be selected when deterioration or intervention remains plausible. A direct oral anticoagulant is often preferred for stable eligible adults later in the course. No exact agent or dose is prescribed in this case.

Medication reconciliation stops avoidable products that increase bleeding risk. The team does not call anticoagulation a "blood thinner" and leave the mechanism unexplained. It reduces extension and recurrence while the body resolves clot; it does not instantly dissolve the embolus. Marisol learns which bleeding signs are urgent and which minor effects warrant a call rather than abrupt self-discontinuation.

Reperfusion and procedural branches#

Systemic thrombolysis, catheter-directed treatment, mechanical thrombectomy, surgical embolectomy, and circulatory support are not interchangeable upgrades. They are considered for selected patients with cardiopulmonary failure or deterioration, integrating bleeding risk, treatment delay, anatomy, local capability, and goals. In a patient with sustained hypotension or arrest from PE, the balance differs sharply from Marisol's current stable state.

Her recent fracture increases concern about trauma-related bleeding but does not automatically prohibit every rescue strategy. If she deteriorated, the team would reassess the actual injury, head trauma history, recent procedures, and absolute or relative contraindications in real time. A multidisciplinary response should speed a decision, not create a conference that delays resuscitation.

Mobility, fracture care, and prevention#

Orthopedics confirms the immobilization plan and safe movement. Physical therapy teaches transfers and a mobility strategy that does not compromise the fracture. Mechanical devices are not placed over the acute DVT without an appropriate plan. Future prophylaxis decisions are individualized; this event does not prove that every person with a walking boot requires anticoagulant prophylaxis.

Diabetes, blood pressure, hydration, pain management, and nutrition are addressed during admission. Weight and smoking history are discussed neutrally as parts of overall risk, not as explanations that shift responsibility to Marisol.

Escalation, referral, and safety net#

Immediate escalation occurs for sustained hypotension, falling perfusion, altered mental state, syncope, worsening hypoxemia, rising lactate, severe tachycardia, new chest pain, increasing right-heart dysfunction, malignant dysrhythmia, or cardiac arrest. Critical care and the multidisciplinary PE team are engaged early when trajectory is uncertain. A patient in shock does not wait for every biomarker or formal severity score before resuscitation and reperfusion decisions.

Major bleeding while anticoagulated also requires urgent action. Gastrointestinal bleeding, intracranial symptoms, retroperitoneal bleeding, expanding fracture-site bleeding, severe anemia, or hemodynamic compromise prompts anticoagulant interruption and reversal assessment according to the specific agent and situation. Minor bruising alone is not managed by silently stopping treatment.

At discharge, emergency triggers include new or worsening breathlessness, fainting, chest pain, hemoptysis, marked palpitations, new leg swelling, severe headache, focal neurologic change, a major fall, black or bloody stool, vomiting blood, uncontrolled bleeding, or profound weakness. Instructions identify a day-and-night contact and distinguish emergency services from the clinic message line.

Communication, shared decisions, and equity#

The clinician explains probability before testing: "The ankle injury and reduced movement raise the chance of a leg clot. Your oxygen level, heart rate, calf swelling, and breathing symptoms make a lung clot important enough that we should image directly rather than rely on a screening blood test." This makes the pathway understandable and avoids presenting CT as defensive routine.

After confirmation, the explanation separates presence from severity: "The scan shows clots in the lung arteries. Your blood pressure is holding, but the right side of your heart is working harder and your oxygen is low. That is why we are starting anticoagulation and monitoring you in the hospital instead of treating this as a low-risk clot at home."

Marisol's limited mobility, stairs, work, prescription coverage, language preference, and pharmacy access are treated as safety variables. A low numerical score cannot make home care safe if medicine cannot be obtained, the patient cannot transfer to a bathroom, or follow-up is unreachable. Conversely, admission should not be prolonged solely because social supports were never mobilized. Case management, pharmacy, physical therapy, and transport services work alongside medical care.

Teach-back includes why anticoagulation is used, when to take it, what to do after a missed dose under the specific product instructions, which medicines to avoid unless a clinician agrees, and when to seek emergency care. Written information is provided in Marisol's preferred language. Family participation follows her permission, not an assumption that an adult daughter will provide unpaid clinical care.

Follow-up and contingencies#

Before discharge, the team documents the clot distribution, RV findings, biomarker trend, oxygen need, DVT, anticoagulant plan, kidney and liver function, blood count, fracture plan, and named clinician responsible for follow-up. Marisol is transitioned to an outpatient-compatible anticoagulant only after access, interactions, and instructions are confirmed. A short-interval contact checks symptoms, medicine supply, bleeding, and mobility.

The primary-treatment duration is determined by the reversible immobilization factor, clot severity, recurrence risk, bleeding risk, and preferences. A transient risk factor often supports a finite course, but "provoked" is not used as shorthand to skip an individualized decision. Treatment is not shortened simply because symptoms improve. It is not extended indefinitely merely because the initial clot looked large.

Routine inherited thrombophilia testing is not ordered during the acute event when the result would not change treatment and could be distorted by acute thrombosis or anticoagulation. The mother's postoperative clot and Marisol's own fracture-associated event are documented. Testing can be reconsidered only if age, recurrence, unusual site, family pattern, or a specific management question makes it useful.

Age-appropriate cancer screening continues, but extensive occult-cancer imaging is not added without clinical clues. Persistent dyspnea, exercise limitation, chest discomfort, anxiety, or functional decline are actively assessed. Symptoms beyond recovery expectations, especially after several months, prompt evaluation for chronic thromboembolic disease, pulmonary hypertension, cardiac disease, lung disease, anemia, deconditioning, or another cause.

Contingencies include:

• If kidney function or contrast allergy had prevented CT pulmonary angiography, ventilation-perfusion imaging and leg ultrasound would be coordinated rather than abandoning objective diagnosis.
• If Marisol had been truly low probability and PERC negative, no D-dimer or imaging might have been needed under a validated pathway.
• If she were low or intermediate probability but not PERC negative, a high-sensitivity D-dimer with an age-adjusted or probability-adjusted threshold could avoid imaging when negative.
• If she developed sustained hypotension, shock, or arrest, reperfusion and mechanical-support decisions would be made emergently.
• If major bleeding prohibited anticoagulation, hematology and procedural specialists would reassess source control, temporary mechanical options, and the earliest safe return to anticoagulation.

Reasoning traps and alternative pathways#

• Ordering D-dimer without deciding probability: A positive result is nonspecific, especially after trauma or with age. The test only works safely inside a defined pathway.
• Using PERC in a visibly non-low-risk patient: PERC is not a universal checklist and cannot rescue an inappropriate low-risk label.
• Mixing algorithms: Choosing an age adjustment, YEARS threshold, and Wells interpretation after seeing results invites motivated reasoning. Select one validated route prospectively.
• Calling a positive D-dimer diagnostic: D-dimer indicates clot turnover but does not locate a clot or distinguish PE from many other conditions.
• Calling a normal chest radiograph reassuring for PE: The film helps identify alternatives and interpret a ventilation-perfusion scan. It does not exclude pulmonary vascular obstruction.
• Letting a normal blood pressure end severity assessment: RV dysfunction, oxygen need, biomarkers, lactate, clinical severity, and trajectory still matter.
• Using clot size alone to choose thrombolysis: Treatment is based on cardiopulmonary effect, deterioration, bleeding risk, anatomy, and evidence, not a dramatic radiology phrase.
• Treating outpatient eligibility as a medical score only: Medicine access, support, mobility, comprehension, and rapid return capacity are integral to safe home care.
• Stopping follow-up when anticoagulation is prescribed: Adherence, bleeding, duration, recurrent symptoms, functional recovery, and chronic thromboembolic complications require ownership.

A different patient with identical pain but low pretest probability and all negative PERC criteria could need no testing. A stable patient with low-risk confirmed PE and robust support might be treated at home after a validated disposition assessment. A pregnant patient would require a pregnancy-adapted pathway and imaging discussion. A patient with shock would enter resuscitation and reperfusion care immediately. The symptom name stays the same while probability and severity produce different actions.

Evidence limits and what could change#

Diagnostic algorithms were validated in specific populations, assays, and health systems. PERC is safest only after genuinely low clinical probability. Age-adjusted and clinical-probability-adjusted D-dimer strategies improve imaging efficiency, but they should not be combined casually, and newer observational evidence continues to test their performance in different cohorts.

The 2026 joint AHA and ACC guideline introduces a more granular acute PE clinical-category framework spanning incidental or low-risk disease through cardiopulmonary failure. Implementation depends on accurate hemodynamic, respiratory, biomarker, and RV assessment. Older scores such as PESI, simplified PESI, and Hestia remain useful for selected disposition questions but do not replace the broader category or real-world feasibility.

Evidence for catheter-based and surgical approaches continues to evolve. Many intermediate-risk patients improve with anticoagulation, while a subset deteriorates. Trials, devices, institutional expertise, and definitions vary, so a procedure should not be presented as automatically safer or more effective than systemic therapy or monitored anticoagulation.

This case links a lower-limb fracture and marked immobility to PE with RV strain. Another patient could have pneumonia, pneumothorax, coronary disease, or musculoskeletal pain. The generalizable method is to assess probability before testing, interpret every result within that probability, reassess severity after confirmation, and carry responsibility through recovery.

Key points#

• Recent immobilization raises pulmonary embolism probability but does not establish the diagnosis.
• PERC, D-dimer, and direct imaging serve different pretest-probability groups and should not be mixed after results are known.
• After PE is confirmed, hemodynamics, oxygenation, RV function, biomarkers, bleeding risk, and trajectory determine early severity.
• Anticoagulation is the main treatment for most PE; reperfusion or mechanical therapy is reserved for selected severe or worsening presentations.
• Outpatient eligibility requires both low clinical risk and a feasible home system.
• Follow-up must address treatment duration, bleeding, recurrence, mobility, functional recovery, and persistent cardiopulmonary symptoms.