a patient with diabetic foot ulcer managed at surgical ward - Nursing Case Study

Pathophysiology

• Primary mechanism: Poor glycemic control in diabetes leads to peripheral neuropathy, which reduces sensation in the feet. This makes patients less aware of injuries, increasing the risk of wounds developing into ulcers.

• Secondary mechanism: Diabetes also causes peripheral vascular disease, which impairs blood flow to the lower extremities. Reduced blood supply hinders the healing process and increases the likelihood of ulceration and infection.

• Key complication: Infected ulcers can lead to tissue necrosis and, if untreated, may require surgical intervention or amputation to prevent the spread of infection.

Patient Profile

Demographics:

58-year-old male, retired construction worker

History:

• Key past medical history: Type 2 Diabetes Mellitus diagnosed 15 years ago, hypertension, hyperlipidemia

• Current medications: Metformin 500 mg twice daily, Lisinopril 10 mg once daily, Atorvastatin 20 mg once daily, Aspirin 81 mg once daily

• Allergies: Penicillin

Current Presentation:

• Chief complaint: Worsening pain and swelling in the left foot

• Key symptoms: Increased redness and warmth around the ulcer, foul-smelling discharge, difficulty walking, intermittent fever

• Vital signs: Temperature 38.5°C, Heart rate 102 bpm, Blood pressure 145/92 mmHg, Respiratory rate 22 breaths per minute, Oxygen saturation 95% on room air

Section 1

New Complications:

A few days into his admission, the patient's condition begins to deteriorate. Despite initial treatment with broad-spectrum antibiotics and wound care, the left foot ulcer shows minimal improvement. On reassessment, the wound appears larger with increased necrotic tissue. The surrounding erythema has expanded, and there is heightened warmth and tenderness extending up the lower leg. His intermittent fever has become more persistent, with temperatures now spiking up to 39°C. The patient's heart rate has increased to 110 bpm, and he reports feeling more fatigued and experiencing chills.

Laboratory results reveal a marked increase in inflammatory markers, with a C-reactive protein (CRP) level elevated to 150 mg/L (normal <10 mg/L) and a white blood cell count of 15,000/mm³, indicating a systemic inflammatory response. Blood cultures are pending, but there is a high suspicion of osteomyelitis given the severity and progression of symptoms. An urgent MRI of the left foot is ordered to assess for bone involvement, which could significantly alter the management plan, potentially necessitating surgical intervention.

Clinically, the team is concerned about the possibility of sepsis due to the systemic signs of infection. The patient is moved to a higher acuity area for closer monitoring, and the antibiotic regimen is adjusted to target more resistant organisms, pending culture results. This progression underscores the importance of vigilant monitoring and timely intervention in diabetic foot ulcers to prevent serious complications, emphasizing the need for an interdisciplinary approach involving the surgical, infectious disease, and diabetes management teams. The next steps in the patient's care will depend on the imaging results and response to the adjusted treatment plan.

Section 2

As the patient's condition is closely monitored in the higher acuity area, the clinical team receives the results of the MRI, which reveal signs consistent with osteomyelitis in the left foot's metatarsal bones. This finding confirms the suspicion of bone involvement and necessitates a shift in the treatment strategy. The surgical team is consulted to discuss potential debridement and the possibility of more extensive surgical intervention to prevent further spread of the infection. Meanwhile, the infectious disease specialists recommend continuing with the adjusted broad-spectrum antibiotic regimen but stress the importance of tailoring the treatment once the blood culture results become available.

Over the next 24 hours, the patient's vital signs show some troubling changes. Despite the adjusted antibiotic therapy, his fever remains high, with temperatures persistently between 38.5-39°C. His heart rate continues to be elevated at 115 bpm, and his blood pressure has dropped slightly to 95/60 mmHg, raising concerns about early signs of septic shock. The patient's oxygen saturation is stable at 96% on room air, but he reports feeling increasingly weak and struggles with increased fatigue. The nursing team notes that his urine output has decreased, prompting the initiation of fluid resuscitation to support his renal function.

The clinical team convenes to reassess the patient's overall management plan, considering both the immediate need to control the infection and the longer-term implications of his diabetic status on wound healing. They prioritize an interdisciplinary approach to address the multifaceted issues, including optimizing glycemic control to enhance recovery, initiating more aggressive wound debridement, and potentially escalating care to include vasopressor support if his hemodynamic status continues to decline. This comprehensive plan underscores the critical interplay between infection management, surgical intervention, and chronic disease control, highlighting the need for coordinated care to stabilize the patient and prevent further complications.

Section 3

The clinical team decides to focus on the response to interventions, as the patient's condition remains precarious. Over the following 12 hours, despite aggressive fluid resuscitation, the patient's blood pressure remains unstable, fluctuating between 90/55 mmHg and 95/60 mmHg. Recognizing the potential for septic shock, the team initiates low-dose norepinephrine to stabilize his hemodynamic status. Concurrently, the patient's urine output improves slightly, indicating a partial response to fluid therapy, but it remains closely monitored due to ongoing concern for renal perfusion.

Reevaluation of the patient's laboratory results reveals a rising white blood cell count, now at 18,000/mm³, alongside elevated inflammatory markers, further indicating the persistence and possible escalation of the infection. The blood cultures finally return, identifying a methicillin-resistant Staphylococcus aureus (MRSA) infection. In response, the infectious disease specialists swiftly adjust the antibiotic regimen to include vancomycin, targeting the specific pathogen more effectively.

As the team integrates these new findings into the treatment plan, they emphasize the importance of enhanced glycemic control to aid in wound healing and infection management. The endocrinology team is consulted to fine-tune the patient's insulin regimen, aiming for tighter control of his blood glucose levels. The patient is educated on the critical role of glucose management in recovery, highlighting patient engagement in his own care. With these adjustments, the clinical team remains vigilant, closely monitoring the patient's response to the tailored interventions, ready to act swiftly should further complications arise.

Section 4

Over the next few hours, the patient's condition exhibits a mixed response to the interventions. While the norepinephrine infusion successfully stabilizes his blood pressure in the range of 100/65 mmHg, indicating improved hemodynamic status, there are concerning developments in his respiratory function. The patient experiences increased respiratory rate, now at 28 breaths per minute, accompanied by a drop in oxygen saturation to 91% on room air. Auscultation reveals diminished breath sounds at the bases, and a subsequent chest X-ray suggests early signs of pulmonary edema, likely secondary to fluid shifts and potential acute lung injury.

The team's attention turns to the patient's renal function, as the slight improvement in urine output is overshadowed by a rise in serum creatinine to 2.3 mg/dL, signaling acute kidney injury. This necessitates a delicate balance in fluid management to avoid exacerbating the pulmonary and renal complications. The nephrology team is consulted to reassess the patient's fluid status and adjust diuretic therapy accordingly, aiming to optimize renal perfusion without compromising respiratory function.

Throughout these developments, the patient's mental status deteriorates, with episodes of confusion and disorientation, raising concerns for potential delirium secondary to sepsis and metabolic imbalances. The clinical team prioritizes frequent neurological assessments, electrolyte monitoring, and a review of the patient's medication regimen to identify any contributing factors. This multifaceted approach underscores the complexity of managing diabetic foot ulcer in the context of systemic infection and multi-organ involvement, highlighting the need for coordinated interdisciplinary care.

Section 5

As the clinical team continues to monitor the patient's progress, new diagnostic results provide further insight into the evolving clinical picture. Blood cultures return positive for Staphylococcus aureus, confirming the presence of a systemic infection likely originating from the diabetic foot ulcer. This finding prompts an adjustment in the antibiotic regimen to include vancomycin, tailored to address the specific pathogen and its potential resistance patterns. The infectious disease specialist underscores the importance of maintaining therapeutic levels of the antibiotic while considering the patient's renal impairment, necessitating close monitoring of drug levels and renal function.

Meanwhile, the patient's metabolic panel reveals a significant electrolyte imbalance with hyponatremia, as his serum sodium level drops to 128 mEq/L. This electrolyte disturbance, coupled with the patient's fluctuating mental status, suggests the possibility of syndrome of inappropriate antidiuretic hormone secretion (SIADH) as a complication of the underlying infection or stress response. The healthcare team initiates a cautious correction of the sodium imbalance, mindful of the risks associated with rapid shifts in serum sodium levels. Fluid restriction is considered alongside other supportive measures to address the SIADH, while maintaining vigilance over the patient's neurological status.

In response to these developments, the multidisciplinary team, including nephrology, infectious disease, and critical care specialists, convenes to reassess and refine the care plan. The focus remains on stabilizing the patient's condition through targeted interventions, with an emphasis on preventing further complications. As the patient navigates this critical phase of his illness, the coordinated efforts of the healthcare team are pivotal in managing the delicate balance of treating the localized and systemic manifestations of his disease. The stage is set for ongoing evaluation and adaptation of the treatment strategy, ensuring the patient's complex needs are met with precision and care.