What is the assessment and management plan for an 83‑year‑old woman with atrial fibrillation, hypertension, chronic renal parenchymal disease who presents with acute right subcostal pain after stair climbing?

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Last updated: September 12, 2026 • View editorial policy

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Assessment: Acute Coronary Syndrome (NSTE-ACS) with Leukocytosis and Possible Infection

This 83-year-old woman with atrial fibrillation on apixaban presents with acute right subcostal chest pain triggered by exertion (stair climbing), which is highly concerning for acute coronary syndrome despite a negative initial troponin, and requires urgent risk stratification with serial troponins, continuous monitoring, and investigation of the marked leukocytosis (WBC 25.31) which may represent concurrent infection or inflammatory process.

Clinical Reasoning

Primary Concern: Rule Out NSTE-ACS

The presentation is concerning for non-ST elevation acute coronary syndrome based on several key features 1, 2, 3:

  • Exertional chest pain: Sharp right subcostal pain triggered by climbing stairs, worse with movement
  • High-risk patient: 83 years old with multiple cardiovascular risk factors (atrial fibrillation, hypertension, chronic renal disease)
  • Atypical presentation: Elderly patients, especially women, frequently present with atypical symptoms including epigastric/subcostal pain rather than classic retrosternal chest pressure 1, 2
  • Initial troponin: 7.8 ng/L (normal <18.5) is within normal range but requires serial measurement as troponin rises over hours 1, 3

Critical Red Flags Present

  1. Marked leukocytosis (25.31 × 10⁹/L): This is severely elevated and demands immediate investigation for:

    • Acute infection (cholecystitis, pneumonia, urinary tract infection)
    • Inflammatory process
    • Stress response to cardiac ischemia
    • Leukemoid reaction

  2. Chronic kidney disease: Creatinine 94 µmol/L (elevated for elderly female) with known bilateral renal parenchymal disease complicates both diagnosis and management 3, 4:

    • Troponin interpretation may be affected by chronic renal injury
    • Increased bleeding risk with anticoagulation
    • Contrast-induced nephropathy risk with imaging

  3. Atrial fibrillation on anticoagulation: Patient is on apixaban 2.5mg BID, which is appropriate dosing for her age (>80 years) and likely meets criteria for dose reduction 5, 6, 7

Immediate Management Algorithm

Step 1: Complete ACS Workup (ONGOING)

Serial troponins are essential - single negative troponin does NOT exclude MI 1, 3:

  • Repeat high-sensitivity troponin at 1-3 hours
  • Look for absolute rise/fall pattern (delta change ≥20% suggests acute MI even if values remain within normal range in CKD patients) 3

12-lead ECG (already ordered):

  • Look for ST depression, T-wave changes, new conduction abnormalities
  • Compare to prior ECGs if available
  • Irregularly irregular rhythm confirms atrial fibrillation

Chest X-ray (already ordered):

  • Rule out pneumonia, heart failure, pneumothorax
  • Assess for rib fractures given trauma concern

Step 2: Investigate Leukocytosis URGENTLY

This WBC of 25.31 with 68% lymphocytes (inverted differential) is highly abnormal and requires:

Blood cultures before antibiotics if infection suspected

Urinalysis with culture (already ordered) - given history of urinary retention

Inflammatory markers: CRP is available and should be trended

Consider chest CT if pneumonia suspected and CXR non-diagnostic

Abdominal imaging: Given RUQ pain history, consider:

  • Right upper quadrant ultrasound for cholecystitis (avoid contrast if possible given CKD)
  • If ultrasound non-diagnostic and patient stable, CT abdomen/pelvis with judicious contrast (see renal protection below)

Step 3: Risk Stratification for ACS

Using ESC guidelines 1, 3, this patient has HIGH-RISK features:

  • Age >75 years
  • Known cardiovascular disease (atrial fibrillation, hypertension)
  • Chronic kidney disease
  • Exertional symptoms
  • Direct chest wall tenderness (may be musculoskeletal BUT cannot exclude ACS)

If troponin rises or ECG changes develop: Proceed to early invasive strategy (angiography within 24 hours) 3

If troponin remains negative and ECG normal: Consider stress testing when clinically stable, though functional capacity assessment needed given age and comorbidities

Step 4: Anticoagulation Management

Continue apixaban 2.5mg BID - appropriate dose given 5, 6, 7, 4:

  • Age >80 years
  • Likely body weight consideration
  • CKD (creatinine clearance estimated 30-50 mL/min based on age/creatinine)

Monitor renal function closely - apixaban requires dose adjustment and caution at CKD G4 4:

  • Calculate CrCl using Cockcroft-Gault formula
  • If CrCl 15-30 mL/min: apixaban 2.5mg BID is appropriate
  • If CrCl <15 mL/min: no official indication, consider warfarin with careful INR monitoring

DO NOT add antiplatelet therapy unless ACS confirmed - bleeding risk is substantially elevated with CKD and age 3, 4

Step 5: Renal Protection Strategy

Given chronic renal parenchymal disease and potential need for contrast imaging 3, 4:

Hydration: IV normal saline 1 mL/kg/hour for 12 hours before and after contrast (if hemodynamically stable)

Minimize contrast volume: Use lowest possible dose

Avoid nephrotoxic medications: NSAIDs, aminoglycosides

Monitor: Serial creatinine at 48-72 hours post-contrast

Differential Diagnosis Priority List

  1. NSTE-ACS (must exclude with serial troponins)
  2. Acute infection (cholecystitis, pneumonia, UTI) - explains leukocytosis
  3. Musculoskeletal pain (costochondritis, rib fracture) - but cannot be diagnosis of exclusion
  4. Pulmonary embolism (less likely given clear breath sounds, but consider if hypoxic)
  5. Renal infarction - rare but reported in atrial fibrillation patients, even on anticoagulation 8, 9, 10, 11

Critical Pitfalls to Avoid

Do not dismiss atypical chest pain in elderly women - this demographic has highest rate of missed MI 1, 2, 12

Do not rely on single troponin - serial measurements are mandatory 1, 3

Do not attribute leukocytosis to stress alone - this degree of elevation (>25) requires investigation for infection/malignancy

Do not stop anticoagulation without compelling reason - atrial fibrillation with CHA₂DS₂-VASc score ≥4 (age, hypertension, female) has high stroke risk 5, 7, 4

Do not use NSAIDs for pain - nephrotoxic and increase bleeding risk; continue paracetamol

Do not add dual antiplatelet therapy empirically - wait for confirmed ACS diagnosis given high bleeding risk 3

Disposition and Monitoring

Admit to monitored bed (telemetry or CCU depending on availability)

Continuous cardiac monitoring for arrhythmias and ischemic changes

Serial troponins at 0,3,6 hours minimum

Strict intake/output monitoring given renal disease

Daily creatinine and electrolytes

Repeat CBC to trend leukocytosis

Cardiology consultation if troponin positive or high clinical suspicion persists

Infectious disease input if source of leukocytosis not identified

References

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