diabetes - Nursing Case Study

Pathophysiology

• Primary mechanism: Insulin deficiency or resistance impairs glucose uptake in cells, leading to hyperglycemia. In Type 1 diabetes, autoimmune destruction of pancreatic β-cells results in absolute insulin deficiency. In Type 2 diabetes, insulin resistance in peripheral tissues combined with inadequate β-cell insulin secretion causes relative insulin deficiency.

• Secondary mechanism: Chronic hyperglycemia induces advanced glycation end-products (AGEs) formation, contributing to vascular damage. AGEs alter protein function and promote oxidative stress, inflammation, and endothelial dysfunction, which compromise blood vessel integrity.

• Key complication: Persistent hyperglycemia and vascular damage lead to microvascular complications, such as diabetic retinopathy, nephropathy, and neuropathy, and macrovascular complications, including cardiovascular diseases, significantly increasing morbidity and mortality.

Patient Profile

Demographics:

58-year-old male, retired construction worker

History:

• Key past medical history: Type 2 diabetes diagnosed 15 years ago, hypertension, hyperlipidemia, diabetic retinopathy, and chronic kidney disease stage 3

• Current medications: Metformin, insulin glargine, lisinopril, atorvastatin, aspirin, and furosemide

• Allergies: Sulfa drugs

Current Presentation:

• Chief complaint: Severe fatigue and shortness of breath

• Key symptoms: Blurred vision, persistent hyperglycemia, swelling in lower extremities, and occasional chest pain

• Vital signs: Blood pressure 180/110 mmHg, heart rate 112 bpm, respiratory rate 24 breaths per minute, temperature 99.1°F, SpO2 88% on room air, blood glucose 350 mg/dL

Section 1

Following the initial presentation, the healthcare team conducted a thorough assessment to identify any immediate threats to the patient's health. Upon examination, the patient exhibited pronounced jugular venous distension and bilateral crackles upon lung auscultation, suggesting fluid overload. The lower extremity edema was pitting in nature, extending to the knees. The patient reported orthopnea and paroxysmal nocturnal dyspnea, further indicating potential heart failure exacerbation. Despite being on lisinopril and furosemide, the patient's blood pressure remained elevated at 180/110 mmHg, and there was no significant diuresis noted. The patient's SpO2 improved to 92% with the administration of 2L of oxygen via nasal cannula, but remained concerning.

Laboratory results provided further insight into the patient's deteriorating condition. Serum creatinine was elevated at 2.5 mg/dL, indicating worsening renal function, which is concerning given his history of chronic kidney disease. The patient's B-type natriuretic peptide (BNP) was markedly elevated at 950 pg/mL, supporting the clinical impression of heart failure exacerbation. Additionally, the hemoglobin A1c level was 9.8%, confirming poor long-term glycemic control. An ECG showed sinus tachycardia with possible left ventricular hypertrophy, but no acute ischemic changes were evident. These findings suggest a multifactorial issue involving cardiac, renal, and glycemic management complexities, necessitating a multidisciplinary approach.

The combination of symptoms and diagnostic findings points to a critical juncture in the patient's management. The healthcare team must now decide on an effective intervention strategy that addresses the patient's heart failure symptoms, optimizes glycemic control, and stabilizes renal function. This will likely involve adjustments to the current medication regimen, including potential escalation of diuretic therapy, re-evaluation of antihypertensive treatment, and consideration of more intensive insulin therapy. The complexity of the case underscores the need for continuous monitoring and re-assessment to manage the interrelated complications effectively and prevent further deterioration.

Section 2

Despite the initial interventions, the patient's condition worsened over the next 24 hours. The healthcare team noted a change in the patient's status, characterized by increased respiratory distress and a persistent lack of response to diuretic therapy. The patient's SpO2 decreased to 88% on 2L of oxygen, prompting an increase to 4L, which only marginally improved oxygen saturation to 90%. The patient's respiratory rate increased to 28 breaths per minute, and he exhibited significant use of accessory muscles, suggesting escalating pulmonary congestion and potential acute decompensated heart failure. Blood pressure remained elevated at 185/115 mmHg despite continued administration of lisinopril and the addition of spironolactone, raising concerns about refractory hypertension.

New laboratory results revealed further deterioration of renal function, with serum creatinine rising to 3.0 mg/dL and blood urea nitrogen (BUN) increasing to 45 mg/dL. These findings indicate acute kidney injury superimposed on chronic kidney disease, likely exacerbated by the current volume overload and inadequate diuresis. Additionally, repeat blood glucose monitoring showed persistent hyperglycemia, with multiple readings exceeding 250 mg/dL, despite initiating a sliding-scale insulin regimen. The patient's urine output remained minimal, and further assessment revealed worsening pitting edema now extending to the thighs, indicating continued fluid retention.

The complexity of the patient's condition necessitated urgent re-evaluation of the treatment approach. The healthcare team decided to escalate diuretic therapy by transitioning to intravenous furosemide and considering the need for dialysis if renal function continued to decline. In parallel, the team explored the possibility of initiating an insulin infusion to achieve better glycemic control. Given the refractory hypertension, consultation with a nephrologist was sought to fine-tune the antihypertensive regimen, taking into account the patient's renal status. This multifaceted approach aimed to stabilize the patient and prevent further decompensation, highlighting the intricate interplay between cardiac, renal, and metabolic systems in this challenging case.

Section 3

Following the escalation of care, the healthcare team closely monitored the patient's response to the revised interventions. Within the next 12 hours, there was a noticeable, albeit partial, improvement in the patient's respiratory status. The intravenous furosemide resulted in a moderate increase in urine output, with 500 mL of diuresis achieved, providing some relief from pulmonary congestion. The patient's SpO2 improved marginally to 92% on 4L of oxygen, and the respiratory rate decreased slightly to 24 breaths per minute. However, accessory muscle use persisted, indicating ongoing respiratory distress. Despite this small progress, the patient's blood pressure remained critically high at 180/110 mmHg, and the decision was made to initiate a continuous infusion of sodium nitroprusside under close monitoring, given its potential to rapidly lower blood pressure while being mindful of the patient's renal impairment.

Concurrent laboratory assessments revealed that while serum creatinine and BUN levels remained elevated, they showed no further significant increase, suggesting a potential stabilization of renal function. Blood glucose control, however, continued to be problematic. Despite initiating an insulin infusion, glucose levels fluctuated, with readings still ranging between 200 and 250 mg/dL. This prompted an endocrinology consult to optimize the insulin infusion protocol and consider additional agents to address insulin resistance. Meanwhile, the patient's generalized edema persisted, and further examination revealed the development of new complications, including ascites, indicative of severe systemic fluid overload.

As the team worked to stabilize the patient's acute issues, new diagnostic results brought additional challenges to the forefront. A chest X-ray confirmed bilateral pleural effusions and cardiomegaly, consistent with volume overload and heart failure exacerbation. An echocardiogram was performed, revealing a reduced ejection fraction at 30%, indicating significant systolic dysfunction. These findings necessitated a reevaluation of the patient's heart failure management, potentially involving advanced therapies such as inotropic support or mechanical circulatory assistance. The healthcare team remained vigilant, aware that the interplay between the patient's cardiac, renal, and metabolic issues required continuous, dynamic reassessment and intervention to improve outcomes and prevent further deterioration.

Section 4

The healthcare team continued to monitor the patient closely, but within the next 24 hours, a change in patient status demanded immediate attention. The patient's respiratory distress intensified, evidenced by increased accessory muscle use and a rising respiratory rate now at 28 breaths per minute, despite maintaining supplemental oxygen. SpO2 levels dropped to 89% on 5L of oxygen, prompting concern for acute hypoxic respiratory failure. The patient's blood pressure, while initially responding to the sodium nitroprusside infusion, began to fluctuate unpredictably, with episodes of hypotension interspersed with hypertension, indicating potential autonomic instability.

Laboratory tests revealed worsening metabolic acidosis with an arterial blood gas showing a pH of 7.28, HCO3- of 18 mEq/L, and a pCO2 of 38 mmHg, suggesting a mixed respiratory and metabolic acidosis. Lactate levels were elevated at 4.5 mmol/L, raising concerns for tissue hypoperfusion and possible sepsis. Concurrently, blood glucose levels remained erratic, now spiking over 300 mg/dL despite adjustments to the insulin regimen, highlighting the complexity of insulin resistance in this patient.

In light of these developments, the team contemplated urgent interventions. The decision was made to start non-invasive ventilation to address the respiratory failure, while also considering the initiation of vasopressors to stabilize hemodynamics. The endocrinology team was tasked with reassessing and intensifying the antidiabetic strategy, possibly incorporating agents like GLP-1 receptor agonists or SGLT2 inhibitors to better manage the hyperglycemia and potential diuretic benefits. As the patient's condition continued to evolve, the healthcare team remained poised to adapt their approach, recognizing the intricate balance required to manage this multifaceted clinical scenario.

Section 5

The healthcare team initiated non-invasive ventilation, opting for BiPAP to improve the patient's oxygenation and reduce the work of breathing. Over the next few hours, the patient's respiratory rate decreased to 24 breaths per minute, and SpO2 improved slightly to 92% on 5L of oxygen. However, the underlying problem persisted, as the patient's accessory muscle use remained evident, and auscultation revealed diminished breath sounds in the lower lung fields, suggesting the possibility of atelectasis or developing pulmonary edema. With the patient's hemodynamics remaining unstable, vasopressor support was commenced with norepinephrine to counteract the hypotensive episodes, while closely monitoring for any adverse effects due to the autonomic instability.

New diagnostic results emerged, further complicating the clinical picture. A repeat chest X-ray confirmed bilateral infiltrates, raising the suspicion of ARDS secondary to either infection or fluid overload. Urgent blood cultures returned positive for Gram-negative rods, indicating a potential source of sepsis and prompting the immediate escalation of broad-spectrum antibiotics. Meanwhile, the patient's renal function deteriorated, with creatinine levels rising to 2.3 mg/dL and a reduced urine output of less than 0.5 mL/kg/hr, suggesting acute kidney injury possibly exacerbated by the hemodynamic fluctuations and metabolic derangements.

The endocrinology team, upon reassessment, adjusted the insulin protocol, incorporating an SGLT2 inhibitor to address both the hyperglycemia and fluid overload concerns. Despite these adjustments, the patient's blood glucose remained challenging to control, oscillating between 250-350 mg/dL. The team was now faced with the need to balance fluid management carefully to avoid exacerbation of the patient's pulmonary status while ensuring adequate renal perfusion. With the patient's condition precarious, the multidisciplinary team prepared for the possibility of escalating to mechanical ventilation and continuous renal replacement therapy, as they navigated this complex clinical scenario with precision and anticipation of further developments.