Bilateral pulmonary imbolism - Nursing Case Study

Pathophysiology

• Primary mechanism: Bilateral pulmonary embolism occurs when blood clots obstruct both pulmonary arteries, impeding blood flow to the lungs. This sudden blockage increases pulmonary vascular resistance, leading to strain on the right ventricle as it works harder to pump blood through narrowed vessels.

• Secondary mechanism: The obstruction reduces the lung's ability to oxygenate blood, causing hypoxemia. This triggers a cascade of compensatory mechanisms, including increased heart rate and respiratory rate, to maintain oxygen delivery to vital organs.

• Key complication: If untreated, the increased pressure on the right heart can lead to right ventricular failure, decreasing cardiac output and potential cardiovascular collapse, making rapid diagnosis and treatment critical.

Patient Profile

Demographics:

45-year-old female, office manager

History:

• Key past medical history: Hypertension, Type 2 Diabetes

• Current medications: Metformin 500 mg twice daily, Lisinopril 10 mg daily

• Allergies: Penicillin

Current Presentation:

• Chief complaint: Sudden onset of shortness of breath

• Key symptoms: Chest pain, rapid heart rate, lightheadedness, mild swelling in both legs

• Vital signs: Blood pressure 145/95 mmHg, heart rate 110 bpm, respiratory rate 24 breaths per minute, oxygen saturation 89% on room air, temperature 37.2°C (99°F)

Section 1

As the healthcare team continues to monitor the 45-year-old female patient, her condition begins to show signs of deterioration, signaling a change in her status. Despite initial oxygen supplementation and anticoagulation therapy to address the bilateral pulmonary embolism, her oxygen saturation remains borderline, fluctuating between 88% and 90% on 2 liters of oxygen via nasal cannula. She reports increasing fatigue and difficulty breathing, even at rest. A repeat assessment reveals a further increase in her heart rate to 122 bpm and a slight drop in blood pressure to 138/90 mmHg, indicating possible right ventricular strain.

The medical team orders an echocardiogram to evaluate the extent of the cardiac involvement. The results show right ventricular dilation and moderate tricuspid regurgitation, suggesting worsening right heart strain. Additionally, a repeat D-dimer test shows elevated levels significantly higher than the initial presentation. These findings indicate that the thromboembolic burden might be larger than initially suspected or that there is ongoing clot propagation, prompting a re-evaluation of her treatment plan.

In response to these developments, the clinical team deliberates on escalating anticoagulation therapy and considers the potential need for thrombolytic agents. A multidisciplinary approach, including cardiology and pulmonology consultations, is initiated to address the growing concern of right heart failure and to explore advanced therapeutic strategies. The healthcare providers must weigh the risks and benefits of more aggressive interventions, given the patient's medical history and current hemodynamic status, to prevent further complications and stabilize her condition.

Section 2

As the healthcare team implements the updated treatment plan, the patient's condition continues to be closely monitored for any changes. Within the next 24 hours, the patient's clinical status begins to exhibit new complications. Her respiratory distress exacerbates, and her oxygen saturation drops further, now ranging between 85% and 87%, despite increasing the supplemental oxygen to 4 liters per minute via nasal cannula. Additionally, she begins to exhibit peripheral edema and jugular venous distension, classic signs of right-sided heart failure, which correlates with the recent echocardiogram findings of right ventricular dilation and tricuspid regurgitation.

Lab results reveal a rising level of troponin, now at 0.45 ng/mL, indicating myocardial strain likely secondary to the increased pressure load on the right heart. The patient's renal function tests show a slight elevation in creatinine to 1.4 mg/dL from a baseline of 1.0 mg/dL, suggesting possible renal hypoperfusion due to compromised cardiac output. These changes prompt the team to re-evaluate the risk of hemodynamic instability and the potential benefits of initiating thrombolytic therapy, despite the inherent risks of bleeding associated with such treatment.

The collaborative decision-making process involves weighing the potential for significant improvement in pulmonary circulation and right heart function against the heightened risk of bleeding complications. With input from cardiology and pulmonology, the team decides to initiate thrombolytic therapy cautiously, with intensive monitoring of coagulation parameters and hemodynamic status. This decision underscores the importance of a dynamic approach to patient care, where evolving clinical data guide the treatment strategy to optimize outcomes and preempt further deterioration in the patient's condition.

Section 3

Following the initiation of thrombolytic therapy, the healthcare team closely monitors the patient's response to the intervention. Within the first few hours, there is a noticeable improvement in her respiratory status; her oxygen saturation begins to stabilize, now consistently ranging between 89% and 91% on 4 liters per minute of supplemental oxygen. This slight improvement in oxygenation suggests that the thrombolytic therapy may be helping to alleviate the obstruction in the pulmonary vasculature, thus enhancing pulmonary circulation. However, the team remains vigilant, as the risk of bleeding is still present.

Despite the positive trend in respiratory function, the patient's hemodynamic status remains a concern. Her heart rate has increased to 112 beats per minute, and her blood pressure has dropped to 98/65 mmHg. The jugular venous distension persists, and the peripheral edema remains unchanged, indicating ongoing right-sided heart strain. Repeat laboratory tests show that the troponin level has decreased slightly to 0.38 ng/mL, suggesting some reduction in myocardial strain. However, the creatinine level has increased further to 1.6 mg/dL, raising concerns about worsening renal function and the possibility of acute kidney injury due to renal hypoperfusion.

The team discusses these findings and decides to adjust the patient's treatment plan. Diuretics are considered to manage the fluid overload and alleviate the symptoms of heart failure, while close monitoring of renal function continues to be a priority. Additionally, the patient's coagulation parameters are checked frequently to detect any early signs of bleeding complications. This ongoing assessment and adaptation of the treatment plan highlight the need for careful clinical reasoning to balance the benefits and risks of interventions, ensuring the patient's safety and optimizing her recovery trajectory. The team remains committed to a multidisciplinary approach, involving cardiology, pulmonology, and nephrology specialists to guide further management decisions.

Section 4

Several hours after the adjustment of the treatment plan, the patient's clinical status undergoes a notable change. Her respiratory function, previously showing gradual improvement, begins to decline once again. The oxygen saturation drops to 85% on the same 4 liters per minute of supplemental oxygen, prompting the healthcare team to escalate her oxygen therapy. The patient's respiratory rate increases to 28 breaths per minute, and she appears visibly distressed, struggling with increased work of breathing. Auscultation reveals crackles in the lung bases bilaterally, suggesting the development of pulmonary edema, likely resultant from the right-sided heart failure that continues to affect her pulmonary circulation.

Concurrently, the diuretics administered to manage her fluid overload yield mixed results. While there is a slight decrease in peripheral edema, the renal function continues to deteriorate, evidenced by a further increase in creatinine levels to 1.9 mg/dL. The urine output remains low, raising concerns about the effectiveness of the diuretics and the potential exacerbation of acute kidney injury. In response to these developments, the team initiates a tailored fluid management strategy, carefully balancing diuretic therapy with fluid administration to optimize the patient's intravascular volume without compromising renal perfusion.

As the team navigates these new complications, the patient's coagulation profile remains a pivotal aspect of care. Repeat tests show a slight prolongation of her prothrombin time and a decrease in platelet count, indicating an increased risk of bleeding. Given these findings, the thrombolytic therapy is reassessed in consultation with hematology, while the team continues vigilant monitoring for any signs of bleeding. This evolving situation underscores the importance of dynamic clinical reasoning and the need for continued collaboration among the multidisciplinary team to address the complexities of the patient's condition, aiming to stabilize her status and prevent further deterioration.

Section 5

As the healthcare team focuses on the patient's deteriorating respiratory status, they initiate a comprehensive assessment to determine the most effective course of action. The patient's vital signs reveal a heart rate of 110 beats per minute, blood pressure of 100/60 mmHg, and continued tachypnea with a respiratory rate of 28 breaths per minute. Notably, her oxygen saturation struggles to maintain above 88% despite increased oxygen supplementation. The new onset of bilateral crackles and the persistence of respiratory distress suggest worsening pulmonary edema, potentially exacerbating the already compromised gas exchange.

The team urgently re-evaluates the patient's fluid management and adjusts the diuretic regimen, considering the delicate balance required to address both pulmonary congestion and renal function preservation. Despite these efforts, a repeat lab panel indicates a further rise in creatinine levels to 2.2 mg/dL, pointing toward an advancing acute kidney injury. Electrolyte imbalances are evident, with potassium levels decreasing to 3.2 mmol/L, heightening the risk of cardiac arrhythmias. This prompts the administration of potassium supplements to mitigate further complications.

Recognizing the precarious nature of the patient's coagulation status, the team consults with hematology to recalibrate the anticoagulation approach. The hematologist recommends careful monitoring of the patient's coagulation profile, with a potential adjustment of anticoagulant dosages to balance the risk of thrombosis versus bleeding. Meanwhile, vigilant monitoring for any signs of bleeding remains a priority. These new developments require the team to exercise dynamic clinical reasoning, integrating the evolving diagnostic information and the patient's response to interventions. This collaborative approach is crucial to formulating a targeted treatment strategy that addresses the multifaceted challenges of the patient's condition, aiming to stabilize her clinical status and prevent further deterioration.