heart failure - Nursing Case Study

Pathophysiology

• Primary mechanism: Impaired cardiac contractility leads to reduced cardiac output, causing the heart to struggle to meet the body's oxygen and nutrient demands. This is often due to conditions like ischemic heart disease or cardiomyopathy, which damage the heart muscle.

• Secondary mechanism: Compensatory mechanisms, such as the activation of the renin-angiotensin-aldosterone system (RAAS), temporarily boost cardiac output but cause fluid retention and increased vascular resistance, further burdening the heart and worsening heart failure over time.

• Key complication: Chronic activation of these mechanisms can lead to ventricular remodeling, which alters heart structure and function, exacerbating heart failure symptoms like edema, fatigue, and dyspnea, impacting patients' quality of life and increasing hospitalization rates.

Patient Profile

Demographics:

68-year-old male, retired construction worker

History:

• Key past medical history: Hypertension, type 2 diabetes, previous myocardial infarction

• Current medications: Lisinopril, Metformin, Aspirin, Furosemide

• Allergies: Penicillin

Current Presentation:

• Chief complaint: Increasing shortness of breath and fatigue

• Key symptoms: Dyspnea on exertion, peripheral edema, orthopnea, occasional palpitations

• Vital signs: Blood pressure 145/95 mmHg, heart rate 110 bpm, respiratory rate 22 breaths per minute, temperature 98.6°F, oxygen saturation 90% on room air

Section 1

As the nursing team conducts an initial assessment, they note several key findings that provide insight into the patient's current condition and guide immediate care priorities. The patient's lung auscultation reveals bilateral crackles at the lung bases, indicating pulmonary congestion likely due to fluid overload. Jugular venous distention is observed, further suggesting increased central venous pressure. Peripheral pulses are weak and thready, and there is 3+ pitting edema in the lower extremities up to the knees. These findings corroborate the history of worsening heart failure and suggest significant fluid retention.

A 12-lead ECG is obtained and shows sinus tachycardia with occasional premature ventricular contractions (PVCs), aligning with the patient's reports of palpitations. Blood tests reveal an elevated BNP (B-type natriuretic peptide) level of 650 pg/mL, confirming the presence of heart failure exacerbation. Serum electrolytes show slight hyponatremia and hypokalemia, likely secondary to diuretic therapy and fluid shifts. Given these findings, the clinical team is concerned about the patient's ability to maintain hemodynamic stability and is considering adjusting medications to better manage fluid status and electrolyte imbalances.

With these assessment findings in hand, the team prepares to implement targeted interventions, such as adjusting the dosages of Furosemide and considering the addition of a potassium-sparing diuretic to address electrolyte imbalances while managing fluid overload. The patient is also placed on supplemental oxygen to alleviate hypoxemia, and continuous monitoring is initiated to detect any further deterioration. These actions aim to stabilize the patient's condition and prevent potential complications like arrhythmias or respiratory distress, setting the stage for further diagnostic evaluations and therapeutic adjustments.

Section 2

As the nursing team continues to closely monitor the patient, they note a change in the patient's status that prompts further evaluation. Despite the initial interventions, the patient begins to exhibit increased respiratory distress, marked by labored breathing and a respiratory rate climbing to 28 breaths per minute. The supplemental oxygen is maintained at 4 liters via nasal cannula, but the patient's oxygen saturation remains borderline at 90%. Additionally, the patient appears more lethargic and reports an increasing sense of fatigue and dizziness. These symptoms raise concern for worsening hypoxemia and potential progression of pulmonary edema.

In response, a repeat chest X-ray is ordered, which reveals further interstitial markings and an increase in alveolar edema, indicating that the fluid overload is not yet adequately controlled. Meanwhile, telemetry monitoring shows an increase in the frequency of premature ventricular contractions, and a brief episode of non-sustained ventricular tachycardia is recorded. These findings suggest that the electrolyte imbalances, particularly hypokalemia, could be contributing to the cardiac irritability.

The clinical team reevaluates the patient's medication regimen, opting to increase the dose of Furosemide to more aggressively address the fluid overload while initiating a potassium supplement to correct the hypokalemia. Furthermore, the addition of Spironolactone, a potassium-sparing diuretic, is considered to help manage the fluid status while minimizing further electrolyte disturbances. The patient's response to these changes is critical, as the team aims to stabilize the hemodynamic status and prevent the progression to more severe complications, such as acute respiratory failure or sustained arrhythmias. Continuous monitoring and frequent reassessments will be essential in guiding the next steps of care.

Section 3

Following the adjustments in the medication regimen, the nursing team continues to monitor the patient closely for signs of improvement or further deterioration. Over the next few hours, the patient exhibits a slight improvement in respiratory effort, with the respiratory rate decreasing to 24 breaths per minute. Oxygen saturation shows a marginal increase to 92% on 4 liters of supplemental oxygen, indicating a mild response to the escalated diuretic therapy. However, the patient remains lethargic and continues to report significant fatigue and dizziness. An assessment reveals mild jugular venous distention and persistent crackles upon auscultation of the lungs, suggesting that while there is some response to treatment, fluid overload remains an issue.

Laboratory tests are conducted to evaluate the patient's electrolyte status and renal function. Results reveal that the potassium level has increased to 3.6 mEq/L, moving closer to the normal range, while serum sodium remains stable. Renal function tests show a blood urea nitrogen (BUN) of 28 mg/dL and a creatinine level of 1.5 mg/dL, indicating that kidney function is being carefully preserved despite the ongoing diuresis. These findings suggest that the electrolyte management strategy is effective, but the team remains vigilant for potential renal impairment due to increased diuretic use.

As the day progresses, the patient's telemetry continues to show occasional premature ventricular contractions, but no further episodes of ventricular tachycardia have occurred. Despite the interventions, the patient's blood pressure is noted to be on the lower side, fluctuating around 98/60 mmHg, raising concerns about the balance between diuresis and maintaining adequate perfusion. The clinical team deliberates on whether to adjust the diuretic therapy further or to consider additional interventions, such as inotropic support, to optimize cardiac output while closely monitoring for any new complications that may arise. The next steps will involve ongoing reassessment of the patient's hemodynamic status and respiratory function to determine the most appropriate course of action.

Section 4

As the evening progresses, the patient's status changes, prompting the nursing team to conduct a thorough reassessment. The patient begins to experience increased shortness of breath, and the respiratory rate climbs back to 28 breaths per minute. Oxygen saturation decreases slightly to 90% despite being on 4 liters of supplemental oxygen. Auscultation of the lungs reveals that crackles have become more pronounced, indicating worsening pulmonary congestion. Additionally, the patient reports a new onset of palpitations and increased chest discomfort, which are concerning for potential cardiac complications. The team notes a slight increase in jugular venous distention compared to earlier assessments, suggesting that despite ongoing diuresis, fluid overload continues to challenge the patient's cardiovascular system.

In response to these changes, new diagnostic tests are ordered, including a repeat chest X-ray and an arterial blood gas (ABG) analysis. The chest X-ray shows bilateral pulmonary edema, confirming the suspected increase in fluid retention in the lungs. The ABG results reveal a pH of 7.34, PaCO2 of 48 mmHg, and PaO2 of 62 mmHg, indicating a respiratory acidosis with moderate hypoxemia. These findings suggest that the patient's respiratory function is deteriorating, likely due to the increased workload on the heart and the accumulation of fluid in the lungs. The telemetry monitor now shows more frequent premature ventricular contractions, which correlate with the patient's reported palpitations, highlighting the need for careful cardiac monitoring and adjustment of the management plan.

Given these developments, the clinical team discusses potential adjustments to the treatment regimen. Consideration is given to initiating inotropic support to enhance cardiac contractility and improve cardiac output. Additionally, there is deliberation about the potential benefits of adjusting the diuretic therapy to more effectively manage fluid overload while minimizing the risk of further lowering blood pressure. The team remains vigilant, ready to implement these changes while carefully monitoring the patient's hemodynamic status and respiratory function. The situation underscores the importance of close observation and timely intervention to prevent further complications and stabilize the patient's condition.

Section 5

The nursing team quickly implements the discussed interventions, beginning with the initiation of inotropic support to enhance cardiac contractility. They start a low-dose infusion of dobutamine, closely monitoring the patient's blood pressure and heart rate to assess the response to treatment. Over the next few hours, the patient exhibits a modest improvement in cardiac output, as evidenced by a slight increase in systolic blood pressure and a reduction in heart rate to 98 beats per minute. However, the patient's oxygen saturation remains at 91%, and respiratory distress is still apparent, though slightly improved. The nursing team notes that the jugular venous distention has not significantly decreased, indicating persistent fluid overload.

To address the ongoing fluid retention, the team decides to adjust the diuretic regimen. They increase the dose of intravenous furosemide, aiming to optimize fluid removal while carefully monitoring electrolyte levels and renal function. Subsequent laboratory tests reveal a slight improvement in the patient's renal function with a creatinine level of 1.6 mg/dL, down from 1.8 mg/dL earlier. Electrolytes show a potassium level of 3.8 mEq/L, a sodium level of 133 mEq/L, and a chloride level of 96 mEq/L, all within acceptable ranges, which provides reassurance that the intensified diuretic therapy is being tolerated well.

Despite these adjustments, the patient begins to experience new complications. The frequency of premature ventricular contractions increases, prompting the team to initiate a continuous infusion of amiodarone to stabilize the cardiac rhythm. Additionally, the patient reports feeling more fatigued and dizzy, which raises concerns about potential hypotension or worsening cardiac output. Vital signs show a blood pressure of 94/58 mmHg and a further decrease in PaO2 to 60 mmHg on an arterial blood gas analysis. These findings suggest that while some aspects of the patient's condition are being managed effectively, the balance between fluid removal and maintaining hemodynamic stability remains precarious. The clinical team recognizes the need for ongoing assessment and potential further adjustments to the treatment plan to address these evolving challenges.