diabetes and sepsis - Nursing Case Study

Pathophysiology

Diabetes:

• Primary mechanism: Insulin deficiency or resistance leads to impaired glucose uptake by cells, causing persistent hyperglycemia.

• Secondary mechanism: Chronic high blood sugar damages blood vessels and nerves, leading to complications like neuropathy and nephropathy.

• Key complication: Poor wound healing due to reduced blood flow and immune response, increasing infection risk.

Sepsis:

• Primary mechanism: Overwhelming infection triggers a systemic inflammatory response, releasing cytokines that cause widespread vasodilation and capillary leakage.

• Secondary mechanism: Resulting hypotension and impaired tissue perfusion lead to organ dysfunction and potential failure.

• Key complication: Septic shock, characterized by severe hypotension unresponsive to fluids, requiring vasopressor support.

Patient Profile

Demographics:

58-year-old male, construction worker

History:

• Key past medical history: Type 2 diabetes mellitus diagnosed 10 years ago, hypertension, diabetic neuropathy

• Current medications: Metformin 1000 mg BID, Lisinopril 20 mg daily, Insulin glargine 20 units at bedtime

• Allergies: Penicillin

Current Presentation:

• Chief complaint: Fever and increasing confusion

• Key symptoms: Elevated blood sugar levels, chills, increased heart rate, shortness of breath, fatigue, pain and redness at a wound site on left lower leg

• Vital signs: Temperature 101.5°F, heart rate 112 bpm, blood pressure 92/60 mmHg, respiratory rate 24 breaths per minute, SpO2 90% on room air

Section 1

As the healthcare team initiates a thorough assessment, they quickly identify several critical findings that demand immediate attention. The patient's left lower leg wound, which is suspected to be the source of infection, is notably erythematous, warm to the touch, and has purulent drainage. Given his history of diabetic neuropathy, the patient may not have perceived the severity of the wound. Additionally, the patient exhibits pronounced lethargy and confusion, raising concerns for potential central nervous system involvement in the setting of sepsis. A bedside glucose check reveals a blood sugar level of 320 mg/dL, indicating poor glycemic control, which can further exacerbate his susceptibility to infection and delayed wound healing.

Lab results from the initial blood work highlight leukocytosis with a white blood cell count of 18,000/mm³, suggesting an acute inflammatory response. Blood cultures are drawn, and an elevated lactate level of 3.8 mmol/L is noted, indicative of tissue hypoperfusion and a heightened risk for septic shock. Kidney function tests reveal a serum creatinine of 1.9 mg/dL, which marks a significant increase from his baseline, pointing towards acute kidney injury likely secondary to sepsis-induced hypoperfusion. The patient's SpO2 remains low at 90% on room air, suggesting possible respiratory compromise, necessitating supplementary oxygen therapy and further investigation to rule out pneumonia or other pulmonary complications.

In response to these findings, the healthcare team initiates broad-spectrum intravenous antibiotics, ensuring they avoid penicillin due to the patient's allergy. Aggressive fluid resuscitation is commenced to address hypotension, aiming to improve tissue perfusion and support renal function. Despite these interventions, the patient's blood pressure remains low, necessitating the initiation of vasopressors to maintain adequate hemodynamic stability. These developments underscore the complexity of managing diabetes complicated by sepsis, emphasizing the need for vigilant monitoring and timely adjustments in the treatment plan as the situation evolves.

Section 2

As the healthcare team continues to monitor the patient, new diagnostic results provide further insights into his condition. A chest X-ray reveals bilateral infiltrates, raising concerns for possible aspiration pneumonia, which could be contributing to the patient's respiratory compromise. This finding correlates with the patient's persistent low SpO2 levels despite supplemental oxygen, prompting an adjustment in the oxygen delivery method to high-flow nasal cannula to optimize oxygenation. Additionally, an echocardiogram is performed to assess cardiac function, given the patient's hypotension and need for vasopressors. The results indicate mild left ventricular dysfunction, suggesting that cardiac output may be compromised, potentially exacerbating tissue hypoperfusion.

Concurrently, the patient's renal function continues to decline, as evidenced by a rising serum creatinine level, now at 2.3 mg/dL. Urine output remains scant despite aggressive fluid resuscitation, leading the team to suspect acute tubular necrosis secondary to prolonged hypotension and sepsis. Nephrology is consulted to evaluate the need for renal replacement therapy if oliguria persists. Meanwhile, the initial blood cultures return positive for methicillin-resistant Staphylococcus aureus (MRSA), prompting a necessary adjustment to the antibiotic regimen to include vancomycin, ensuring targeted antimicrobial coverage.

These developments necessitate a reassessment of the treatment plan, with an emphasis on addressing the multi-organ involvement that characterizes the patient's complex presentation. The team must balance the management of sepsis with the underlying complications of diabetes, such as poor wound healing and neuropathy, while anticipating potential challenges ahead. Continuous evaluation of the patient's hemodynamic status, renal function, and respiratory efforts will be critical in guiding ongoing interventions and preventing further deterioration. This integrated approach highlights the need for interdisciplinary collaboration to navigate the intricacies of this evolving clinical scenario.

Section 3

As the healthcare team continues to monitor the patient, a change in his status becomes evident. The patient's respiratory status deteriorates despite the use of a high-flow nasal cannula, with SpO2 levels now fluctuating between 85-88%. He exhibits increased work of breathing, with intercostal retractions and use of accessory muscles. Auscultation reveals coarse crackles bilaterally, consistent with worsening pulmonary infiltrates. In response, the team considers escalating respiratory support to non-invasive ventilation, such as BiPAP, to prevent further respiratory compromise and potential intubation.

Simultaneously, the patient's hemodynamic status remains precarious. Blood pressure readings show persistent hypotension, with systolic pressures hovering around 85-90 mmHg despite vasopressor support. Heart rate remains elevated at 110-120 beats per minute. Laboratory results indicate worsening lactic acidosis, with lactate levels climbing to 5.0 mmol/L, suggesting inadequate tissue perfusion and oxygen delivery. The team re-evaluates fluid management strategies, considering the risk of fluid overload versus the need for adequate perfusion pressure.

In the midst of these challenges, the patient's blood glucose levels present additional complications. Despite regular insulin administration, glucose levels remain erratic, fluctuating between 180-250 mg/dL, complicating the management of his diabetes and potentially contributing to delayed wound healing and increased infection risk. The endocrinology team is consulted to optimize glycemic control, aiming to maintain tighter glucose ranges to support recovery and minimize additional metabolic stress. Together, these developments underscore the complexity of the patient's condition, necessitating a coordinated, multi-disciplinary approach to adjust the treatment plan and anticipate further interventions.

Section 4

As the healthcare team intensifies their efforts to stabilize the patient, new diagnostic results reveal a critical development: a recent chest X-ray indicates significant progression of bilateral pulmonary infiltrates, suggesting evolving Acute Respiratory Distress Syndrome (ARDS). This finding aligns with the worsening respiratory symptoms and provides a clearer picture of the patient's deteriorating pulmonary function. Concurrently, arterial blood gas (ABG) analysis shows a pronounced respiratory acidosis, with a pH of 7.28 and a PaCO2 of 55 mmHg, indicating inadequate ventilation and the urgent need for more aggressive respiratory support.

In response to the new diagnostic information, the team decides to initiate BiPAP therapy, aiming to improve oxygenation and CO2 clearance, while closely monitoring the patient's tolerance and effectiveness of this intervention. Despite this step, the patient's hemodynamic status continues to pose a challenge. A repeat echocardiogram demonstrates signs of left ventricular dysfunction, potentially contributing to the persistent hypotension and complicating the fluid management strategy. The cardiology team recommends cautious fluid administration while optimizing inotropic support to enhance cardiac output without exacerbating pulmonary congestion.

These developments present the healthcare team with a multifaceted clinical scenario. The integration of respiratory and cardiac interventions is crucial to stabilizing the patient, while the management of his diabetes remains a key component to prevent further metabolic derangement. The interdisciplinary team collaborates to refine the treatment plan, emphasizing the need for continuous reassessment and flexibility in response to the patient's evolving condition. This comprehensive approach aims to mitigate the risk of additional complications and guide the patient towards a more stable trajectory.

Section 5

As the healthcare team continues to monitor the patient's response to the implemented interventions, a notable change in patient status becomes evident. Over the next 12 hours, the patient's respiratory effort increases, and despite BiPAP therapy, oxygen saturation levels continue to hover around 85%. The patient exhibits increased work of breathing, with visible use of accessory muscles. The decision is made to transition to endotracheal intubation and mechanical ventilation to ensure adequate oxygenation and ventilation. During this process, the patient's blood pressure drops further to 85/55 mmHg, prompting the need for vasopressor support with norepinephrine to maintain hemodynamic stability.

Concurrently, laboratory results reveal a concerning trend in the patient's metabolic profile. Blood glucose levels have risen to 320 mg/dL, complicating the management of the patient's diabetes. This hyperglycemia is addressed with an insulin infusion, carefully titrated to avoid rapid shifts in glucose levels that could exacerbate the patient's condition. In addition, a repeat complete blood count indicates a rising white blood cell count of 18,000/mm³, suggesting ongoing infectious processes despite broad-spectrum antibiotic therapy.

These developments necessitate a reevaluation of the patient's overall treatment strategy. The interdisciplinary team, including intensivists, cardiologists, and endocrinologists, convenes to address the multifaceted challenges. The focus shifts to optimizing mechanical ventilation settings to improve gas exchange while balancing fluid management to support cardiac function without overwhelming the lungs. The team's collaborative efforts aim to stabilize the patient's respiratory and hemodynamic parameters, while also intensifying efforts to control the infection and manage the diabetic state. This comprehensive, coordinated approach is critical as the patient's condition remains precarious, necessitating vigilant monitoring and timely adjustments to the treatment plan.