Assessing parenteral diuretic treatment of decompensated heart failure in the community

Diuretic Treatment in Patients with Heart Failure: Current Evidence and Future Directions - Part I: Loop Diuretics

PURPOSE OF REVIEW

Fluid retention or congestion is a major cause of symptoms, poor quality of life, and adverse outcome in patients with heart failure (HF). Despite advances in disease-modifying therapy, the mainstay of treatment for congestion-loop diuretics-has remained largely unchanged for 50 years. In these two articles (part I: loop diuretics and part II: combination therapy), we will review the history of diuretic treatment and the current trial evidence for different diuretic strategies and explore potential future directions of research.

RECENT FINDINGS

We will assess recent trials including DOSE, TRANSFORM, ADVOR, CLOROTIC, OSPREY-AHF, and PUSH-AHF amongst others, and assess how these may influence current practice and future research. There are few data on which to base diuretic therapy in clinical practice. The most robust evidence is for high dose loop diuretic treatment over low-dose treatment for patients admitted to hospital with HF, yet this is not reflected in guidelines. There is an urgent need for more and better research on different diuretic strategies in patients with HF.

From Oral to Subcutaneous Furosemide: The Road to Novel Opportunities to Manage Congestion

The steadily rising prevalence of heart failure (HF) and the associated increase in health care expenditures represent a significant burden for patients, caregivers, and society. Ambulatory management of worsening congestion is a complex undertaking that requires diuretic escalation, yet clinical success is often hindered by the progressively declining bioavailability of oral agents. Once beyond a threshold, patients with acute on chronic HF often require hospital admission for intravenous diuresis. A novel, pH neutral formulation of furosemide that is administered by a biphasic drug delivery profile (80 mg total over 5 ​hours) via an automated, on-body infusor was designed to overcome these limitations. Early studies have shown that it has equivalent bioavailability with comparable diuresis and natriuresis to the intravenous formulation, leads to significant decongestion, and improvement in quality of life. It was shown to be safe and is well tolerated by patients. Although there is one ongoing clinical trial, available data have demonstrated the potential to shift hospital-administered, intravenous diuresis to the outpatient setting. Reduction in the need for recurrent hospital admissions would be highly desirable by most patients with chronic HF and would lead to a significant reduction in health care expenditures. In this article, we describe the rationale and evolution of this novel PH neutral formulation of furosemide administered subcutaneously, summarize its pharmacokinetic and pharmacodynamic profiles, and review emerging clinical trials demonstrating its clinical safety, efficacy, and potential to reduce health care expenditures.

Intravenous diuretic administration in the home environment

Chronic heart failure is a condition associated with ageing, affecting 1-2% of the adult population, raising to 70% of the adult population over 70 years of age. Diuretics are often the first-line treatment for patients with symptomatic heart failure, not just oedema. Traditionally, intravenous (IV) diuretic therapy has been administered only in hospitals. In 2012, the British Heart Foundation ran a pilot study investigating the effectiveness of IV diuretic administration within the home. Since then, there has been an increase in these services. This article examines the advantages and disadvantages of this service, whether community nurses are best placed to deliver this, and what the benefits to the patient might be.

Administration of label and off-label drugs by the subcutaneous route in palliative care: an observational cohort study

BACKGROUND

The marketing authorisation for many injectable drugs used in palliative care does not cover the frequently preferred subcutaneous route. Consequently, subcutaneous off-label drug administration is often practised.

AIM

To assess the use, safety and tolerability of subcutaneous label and subcutaneous off-label drug administration in a Danish hospice.

MATERIAL AND METHODS

Retrospective data from hospice inpatient records registered with subcutaneous drug administration. Prospective data of subcutaneous drug administration registered to hospice inpatients over a period of 2 months.

RESULTS

Drugs were administered subcutaneously to 90% of patients in both studied cohorts. Thirty different drugs were administered subcutaneously. Ten (33%) drugs were authorised for subcutaneous administration, 14 (47%) for intramuscular and 6 (20%) for intravenous administration only. A search in major palliative literature and scientific publications revealed that 11 of the 20 subcutaneous off-labelled drugs were administered with little to no support from these sources. In seven patients, 11 adverse drug reactions (ADRs) were registered. ADRs were all minor local reactions and led to drug discontinuation in two patients only.

CONCLUSION

Subcutaneous drug administration was frequently used in the hospice. Two-thirds of the drugs were administered subcutaneously off-label. The findings of only a few and minor ADRs indicate that the drugs identified in this study, although often subcutaneously off-label and with little support from palliative literature, were administered with acceptable safety and tolerability. Off-label treatment practised in the clinic should be identified, reported and serve as inspiration for future scientific research and incentives for extension of marketing authorisations.

Subcutaneous furosemide for the treatment of heart failure: a state-of-the art review

The prevalence of heart failure (HF) is on the rise. By 2030, over eight million Americans (46% increase from current prevalence) will have heart failure. In the USA, approximately 30 billion dollars is spent annually on heart failure and this number will likely double in 2030. Thus, HF represents a significant economic burden. Acute decompensated heart failure (ADHF) is a clinical spectrum, which refers to increasing symptoms and signs of heart failure prompting an emergency room visit or hospitalization. In ADHF, inpatient administration of intravenous diuretic is the standard of care due to the variability in the absorption of oral diuretics. Within 30 days, 25-30% of these patients are readmitted with recurrent ADHF. Recent efforts have focused in reducing HF readmission, and thereby decreasing costs; hence, innovative outpatient treatment options have emerged. Subcutaneous furosemide use will potentially overcome the need to place intravenous lines, reduce associated expenses, and enable management of ADHF at home. This review presents data on the pharmacodynamics and pharmacokinetics of subcutaneous furosemide, scientific evidence on the use of this therapy in the palliative and hospice population, and its experimental use as an outpatient therapy and/or as a bridge from inpatient to home.

Subcutaneous fluid and drug delivery: safe, efficient and inexpensive

Patients with difficult venous access or oral intolerance and clinical situations with inadequate response to oral therapy have generated the need for alternative routes of delivery for drugs and fluids.

The purpose of this study was to conduct a systematic review examining the evidence for subcutaneous (SC) administration of drugs and/or fluids.

We used a broad search strategy using electronic databases CINAHL, EMBASE, PubMed and Cochrane library, key terms and ‘Medical Subject Headings’ (MeSH) such as ‘subcutaneous route’, ‘hypodermoclysis’ and the name/group of the most used drugs via this route (e.g. ‘ketorolac, morphine, ceftriaxone’, ‘analgesics, opioids, antibiotics’).

We conclude that the SC route is an effective alternative for rehydration in patients with mild–moderate dehydration and offers a number of potential advantages in appropriately selected scenarios. Experience of administering drugs by this route suggests that it is well tolerated and is associated with minimal side-effects.