Efficacy and Safety of Levosimendan in Patients With Acute Decompensated Heart Failure: A Real-World Evidence

INTRODUCTION:

Heart failure (HF) is a clinical syndrome characterized by the reduced capacity of the left ventricle of the heart to pump or fill with blood, often leading to inadequate cardiac output and compensatory mechanisms such as neurohormonal activation and increased left ventricular filling pressures. Globally, HF affects an estimated 64.3 million people, marking it one of the major public health concern. Acute decompensated heart failure (ADHF), a clinical stage of HF, characterized by a rapid deterioration of symptoms and necessitates immediate medical attention. ADHF is particularly associated with high morbidity and mortality rates, significant healthcare utilization, and adverse long-term outcomes. ADHF contributes significantly to hospital admissions, especially among patients with heart failure with reduced ejection fraction (HFrEF). In high-income countries such as the United States and Europe, ADHF accounts for over one million hospitalizations annually. Alarmingly, approximately 24% of these patients are readmitted within 30 days, and 50% experience rehospitalization within six months. The recurrence of HF exacerbations often leads to a worsening prognosis, progressive multiorgan dysfunction, and increased mortality, with one in six patients succumbing within 30 days of hospitalization.

The burden of HF is even more in low- and middle-income countries (LMICs), including Bangladesh, though data is limited. In LMICs, delayed diagnosis, resource limitations, and late-stage presentation exacerbate the challenges of HF management. Bangladesh is experiencing a rising prevalence of cardiovascular diseases, with HF emerging as a leading cause of hospitalization and mortality along with increased life expectancy and aging of the population. Factors such as hypertension, diabetes, coronary artery disease, and rheumatic heart disease contribute significantly to the incidence of HF in the region. The healthcare infrastructure in Bangladesh is often ill-equipped to handle the complex needs of HF patients, with limited access to advanced diagnostic tools, medications, and specialized care. This leads to frequent hospitalizations and poor outcomes for patients with ADHF.

The management of ADHF involves a combination of pharmacological and non-pharmacological strategies aimed at stabilizing the patient, alleviating symptoms, and improving hemodynamic parameters. Diuretics, particularly loop diuretics, are the cornerstone of ADHF treatment, effectively reducing fluid overload. However, diuretics alone do not address the underlying pathophysiology of HF, leaving patients with severe symptoms inadequately managed. Inotropic agents such as dobutamine and dopamine are often employed to enhance cardiac output in more severe cases. Vasodilators like nitroglycerin and nitroprusside are additional options, particularly in patients with hypertension and pulmonary congestion.

Beside these pharmacotherapies, Levosimendan, a calcium-sensitizing inotropic agent, represents a significant advancement in the treatment of ADHF. Unlike traditional inotropes, Levosimendan enhances myocardial contractility without markedly increasing myocardial oxygen consumption, thereby reducing the risk of tachyarrhythmias and ischemic events. Its dual action as an inotrope and vasodilator allows it to improve both cardiac output and systemic vascular resistance, making it particularly effective in patients with severe low-output HF. Clinical evidence suggests that Levosimendan improves symptoms, reduces hospital length of stay, and, in some studies, decreases mortality. Additionally, it's unique mechanism of action and sustained hemodynamic effects-mediated through its active metabolite-offer an extended therapeutic window even after the cessation of infusion.