Global Health Case Report: Concurrent Pulmonary Embolism and Osteomyelitis in a Patient with Uncontrolled Diabetes
SUMMARY
This report details the case of a 53-year-old female from a rural setting in Bihar, India, with a 12-year history of poorly controlled diabetes mellitus. She presented with acute-on-chronic systemic hypoxia, initially attributed to sepsis from a chronic diabetic foot ulcer. However, a series of targeted investigations uncovered a more complex clinical picture involving at least two simultaneous life-threatening pathologies: a high probability of pulmonary embolism (PE) and definite, severe osteomyelitis of the foot. The case highlights the diagnostic and therapeutic challenges of managing patients with cascading comorbidities, particularly the need to resist premature diagnostic closure and act decisively in the face of uncertainty. The patient was successfully managed with therapeutic anticoagulation, broad-spectrum antibiotics, and surgical debridement (great toe disarticulation), leading to clinical stabilization. This case serves as a crucial example of the "domino effect" of chronic non-communicable diseases in global health settings.
KEYWORDS
Pulmonary Embolism, Diabetic Foot Ulcer, Osteomyelitis, Glycemic Variability, Diagnostic Uncertainty, Socratic Steelman, Global Health, Resource-Limited Setting.
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INTRODUCTION
In global health, patients with long-standing, poorly managed non-communicable diseases (NCDs) like diabetes mellitus frequently present with multiple, intertwined complications. A common and dangerous clinical scenario is the patient with a diabetic foot ulcer who develops acute systemic symptoms. The most convenient diagnosis is often sepsis originating from the wound. But is this always the correct or complete picture? What if another, equally lethal process is occurring simultaneously?
This case report concerns a 53-year-old female whose presentation forced a direct confrontation with this diagnostic dilemma. The Socratic question at the heart of this case is: How should a clinician prioritize diagnostic and therapeutic pathways when a single patient presents with compelling evidence for two distinct, life-threatening conditions (thromboembolism and sepsis)? Using a "Steelman" approach, we will reconstruct the clinical reasoning not as a linear path to a single answer, but as a robust, parallel process that validates the initial uncertainty and demonstrates how to navigate it safely. The purpose is to illustrate a framework for managing high-stakes ambiguity in complex patients, a daily reality in many healthcare environments.
METHODS (CASE PRESENTATION)
A 53-year-old female with a 12-year history of diabetes mellitus, managed with an inconsistent insulin regimen, presented to a local clinic in Bihar.
Her chief complaint was a non-healing ulcer on her right great toe, present for over a month, which had progressed to expose bone. Acutely, she developed systemic hypoxia, requiring 3 liters of oxygen per hour to maintain an SpO2 of 95%.
Initial evaluation revealed tachycardia (100 bpm), tachypnea (24-26 breaths/min), and dangerously unstable blood glucose levels ranging from a low of 74 mg/dL to a hyperglycemic crisis peak of 514 mg/dL. The patient, however, paradoxically denied any subjective feeling of shortness of breath ("happy hyoxemia").
A diagnostic cascade was initiated to address the primary life-threat: hypoxia.
RESULTS
Laboratory Findings: A D-dimer test was grossly elevated ("in the thousands"), creating a high pre-test probability for thromboembolic disease. Blood glucose logs confirmed severe glycemic variability, reflecting a brittle diabetic state.
Radiological Findings:
Chest X-Ray: Was deceptively clear, showing no signs of pneumonia, fluid overload, or other parenchymal cause for the hypoxia.
Venous Doppler Ultrasound (Right Lower Limb): Was ordered to find the source of a potential PE. It was negative for deep vein thrombosis (DVT). However, the ultrasound serendipitously provided a definitive secondary diagnosis: a 3.6 cm abscess surrounding the great toe with clear signs of underlying osteomyelitis (bone infection).
Foot X-Ray & Clinical Images: Confirmed complete destruction of the proximal phalanx of the great toe, consistent with advanced, limb-threatening osteomyelitis.
Clinical Course & Interventions:
Based on the classic combination of unexplained hypoxia, a clear chest X-ray, and a massively elevated D-dimer, a working diagnosis of Pulmonary Embolism was established. Therapeutic anticoagulation with LMWH was initiated immediately, even before definitive imaging could be obtained.
Concurrently, based on the Doppler and X-ray findings, a diagnosis of severe diabetic foot osteomyelitis with sepsis was confirmed. The patient was placed on broad-spectrum IV antibiotics (Amoxicillin/Clavulanate and Clindamycin).
Source Control: The patient underwent a disarticulation of the right great toe at the metatarsophalangeal joint to remove the necrotic and infected tissue.
Post-operatively, the patient’s hypoxia resolved, and she was weaned off oxygen. Her glycemic control was stabilized on a revised insulin regimen, and she was transferred to the ward for continued monitoring before a planned discharge.
DISCUSSION (SOCRATIC STEELMAN)
This case is a masterclass in managing concurrent pathologies. Let us "Steelman" the clinical journey by asking the key Socratic questions the care team faced.
1. Was it correct to prioritize Pulmonary Embolism when a floridly infected foot provided an obvious source for sepsis-induced hypoxia?
Absolutely. The strongest argument for prioritizing PE is not that it's more likely, but that it is more immediately lethal if missed and requires a completely different treatment. The clinical triad of hypoxia, tachycardia, and a normal chest X-ray is a textbook PE presentation. To attribute these findings solely to "sepsis" from the foot without aggressively ruling out PE would be an example of premature diagnostic closure. The team correctly identified the pattern with the highest mortality risk and acted on it by starting anticoagulation, a decision that is difficult but necessary in the face of ambiguity.
2. Does a negative DVT scan rule out PE, and what was the hidden value of this "negative" test?
A common pitfall is to believe a negative peripheral DVT scan excludes a PE. This is false. Clots can originate from pelvic veins or have already fully embolized to the lungs. The true value of the Doppler scan here was its accidental discovery. It provided incontrovertible evidence of severe osteomyelitis, shifting the clinical picture from a "non-healing ulcer" to "limb-threatening bone infection with sepsis." This finding did not negate the PE diagnosis but rather added a second, equally critical diagnosis that demanded its own aggressive management (surgery and targeted antibiotics). This demonstrates the principle of diagnostic serendipity.
3. How does one manage the therapeutic conflict of anticoagulating a patient who needs urgent surgery?
This is the central challenge. The patient needed anticoagulation for the PE, which increases bleeding risk, and simultaneously needed surgery for the osteomyelitis, which carries its own bleeding risk. There is no perfect, risk-free answer. The clinical team correctly reasoned that the systemic, immediate threat of a fatal PE was greater than the manageable, local risk of bleeding from the foot surgery. The correct path, which they followed, is to:
Start anticoagulation immediately.
Inform the surgical team about the anticoagulation.
Proceed with the necessary surgery (source control) with meticulous hemostasis.
Monitor the patient closely post-operatively.
This balancing act is a high-level skill, particularly in settings where surgical and ICU support may be limited.
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THEMATIC ANALYSIS
The Domino Effect of Chronic Disease: This case is a powerful illustration of how a single NCD, poorly managed over time, creates a cascade of catastrophic failures. Diabetes led to neuropathy and vascular disease, which led to a foot ulcer, which led to osteomyelitis, which created a hypercoagulable state that likely resulted in a PE, all while the underlying metabolic chaos (glycemic variability) worsened every aspect of the illness. This is the modern face of disease in many parts of the world.
Resisting Premature Diagnostic Closure: The most significant intellectual victory in this case was the refusal to accept "sepsis" as a simple, all-encompassing diagnosis for the patient's hypoxia. By maintaining a broad differential and recognizing the classic PE pattern, the team avoided a potentially fatal misstep.
Acting in the Face of “Therapeutic Uncertainty”:
The decision to start anticoagulation before a definitive CTPA scan was available represents a crucial lesson for resource-limited settings. When diagnostic tools are delayed or unavailable, treatment must often be initiated based on high clinical suspicion and a careful risk/benefit analysis. In this case, the risk of not treating a PE far outweighed the risk of treating it.
Follow up:
On Day 17, the patient was reviewed in the outpatient department, showing continued clinical stability.
This case was first reported here in real time even as she presented to the treating unit:
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