Subcutaneous furosemide in advanced heart failure: service improvement project

The Role of Subcutaneous Furosemide in Heart Failure Management: A Systematic Review

BACKGROUND

Acute decompensated heart failure (ADHF) patients with symptomatic congestion often require in-hospital admission for intravenous (IV) diuretic, impacting both patient well-being and healthcare expenses. Subcutaneous (SC) furosemide has a potential to facilitate outpatient management of ADHF patients. Thus, this study aims to assess the efficacy and safety of SC furosemide utilization, offering a potential alternative to traditional IV administration.

METHODS

A systematic search was conducted until April 14 2024 across scientific databases. This review included studies comparing SC furosemide with oral and IV formulations in adult HF patients.

RESULTS

This study analyzed 687 patients from 20 studies. The results demonstrate that SC furosemide can effectively manage symptomatic congestion in HF patients and results in significant cost reductions, symptom relief, and improved quality of life. Although further investigation into mortality rates is needed, SC furosemide demonstrates efficacy comparable to IV furosemide in diuresis and weight loss, with similar bioavailability and natriuretic effects. Adverse events are generally minor, predominantly related to skin irritation. Innovative strategies, such as developing isotonic alkaline solutions and improved infusion devices, are being explored to address these challenges.

CONCLUSION

SC furosemide offers a promising alternative for managing ADHF, particularly in symptomatic HF patients with volume overload. The integration of SC furosemide into routine clinical practice and future guidelines, could optimize the management of HF, reducing hospital admission and improving patient outcomes.

Human Factors Validation of a Wearable, On-Body Infusor for Subcutaneous Administration of Furosemide

Purpose

Furoscix® (subcutaneous furosemide) is administered using a wearable On-Body Infusor (OBI) and is approved for the treatment of congestion associated with heart failure (HF). The purpose of this study was to assess the safe and effective use of the OBI and Instructions for Use (IFU) by patients with HF, caregivers, and healthcare practitioners (HCPs).

Methods

Sixty participants (patients, n=30; caregivers, n=15; HCPs, n=15) were evaluated on completion of OBI use tasks and IFU knowledge tasks in a simulated use environment. Fifteen of the patients received OBI/IFU training before evaluation.

Results

Overall, 893/900 (99.2%) use tasks and 2211/2220 (99.6%) knowledge tasks were completed successfully, without differences due to training. The most common (n=6) use error was failure to wipe skin or cartridge tip with an alcohol wipe. Errors were due to forgetfulness/misinterpretation rather than IFU clarity.

Conclusion

The subcutaneous furosemide OBI can be safely and effectively used by patients, caregivers, and HCPs, regardless of training.

Short subcutaneous infusions for symptom control in palliative medicine

OBJECTIVES

To investigate the efficacy and safety of short subcutaneous infusions (SSCIs) for refractory symptoms in the palliative setting.

METHODS

A retrospective chart review of SSCIs in a single palliative care centre over an 18-month period. All clinical notes, medication administration records and infusion monitoring documentation were examined to ascertain therapeutic aim, efficacy and tolerability.

RESULTS

111 patients received one or more SSCIs, 28 in the community and 83 in the inpatient hospice (21% of all admissions). SSCIs were used for a wide variety of reasons including loading doses (to achieve steady state and, thus, symptom relief, sooner), as required doses (for medications too irritant to give as bolus SC injections) and regular maintenance doses (where continuous subcutaneous infusion (CSCI), were unnecessary). 84 single drug SSCIs types and 51 admixtures SSCIs types (2 or more medications) were given. One infusion was poorly absorbed, but SSCIs were otherwise well tolerated.

CONCLUSIONS

SSCIs appear to be a promising additional option for administering medicines that are too irritant or large in volume for SC bolus injection. For medications with longer half-lives (eg, phenobarbital, valproate, levetiracetam), SSCI loading doses would be expected to achieve steady state and, thus, symptom relief, sooner than CSCIs alone.

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.

Subcutaneous Furosemide: A Novel to Euvolemia

Furoscix, a subcutaneous pH-neutral formulation of furosemide, obtained US Food and Drug Administration approval in October 2022 for adult patients with New York Heart Association class II and class III chronic heart failure. This approval marks an anticipated potential shift in the traditional management of decongestive therapy in chronic heart failure patients from the confines of the hospital to more accessible outpatient or home-based care. In this review, we will summarize existing evidence regarding the use of subcutaneous furosemide in comparison to both oral and intravenous formulations, highlighting the demonstrable benefits of its application in both outpatient and inpatient settings, and also discuss several factors that may limit its use.

Advanced heart failure: parenteral diuretics for breathlessness and peripheral oedema - systematic review

BACKGROUND

Advanced heart failure patients suffer with breathlessness and peripheral oedema, which are frequently treated with parenteral diuretics despite limited evidence.

AIM

To analyse the effectiveness of parenteral diuretics on breathlessness and peripheral oedema in advanced heart failure patients.

METHODS

We searched Embase, MEDLINE(R), PsycINFO, CINAHL and CENTRAL from their respective inceptions to 2021, and performed handsearching, citation searching and grey literature search; limited to English publications. Selection criteria included parenteral (intravenous/subcutaneous) diuretic administration in advanced heart failure patients (New York Heart Association class III-IV). Two authors independently assessed articles for inclusion; one author extracted data. Data were synthesised through narrative synthesis or meta-analysed as appropriate.

RESULTS

4646 records were screened; 6 trials (384 participants) were included. All were randomised controlled trials (RCTs) comparing intravenous continuous furosemide infusion (CFI) versus intravenous bolus furosemide infusion (BFI). Improvement in breathlessness and peripheral oedema (two studies, n=161, OR 2.80, 95% CI 1.45 to 5.40; I2=0%), and increase in urine output (four studies, n=234, mean difference, MD 344.76, 95% CI 132.87 to 556.64; I2=44%), were statistically significant in favour of CFI. Significantly lower serum potassium was found in BFI compared with CFI (three studies, n=194, MD -0.20, 95% CI -0.38 to -0.01; I2=0%). There was no difference between CFI and BFI on reduction in weight, renal function or length of hospital stay.

CONCLUSIONS

CFI appears to improve congestion in advanced heart failure patients in the short term. Available data came from small trials. Larger, prospective RCTs are recommended to address the evidence gap.

Subcutaneous Drugs and Off-label Use in Hospice and Palliative Care: A Scoping Review

BACKGROUND

Subcutaneous drug administration is an interesting approach for symptom control in hospice and palliative care. However, most drugs have no marketing authorization for subcutaneous administration and are therefore used off-label. In order to meet the requirements of a safe and effective drug therapy, especially in highly vulnerable patients, it is essential to investigate the scope of evidence of these common practices.

OBJECTIVES

The purpose of this scoping review was to provide an overview of available data on the tolerability and/or effectiveness of subcutaneously administered and off-label used drugs.

METHOD

We performed a scoping review according to the PRISMA extension to identify data available on the tolerability and/or effectiveness of 17 predefined drugs that are commonly administered subcutaneously in Swiss hospices and hospice-like institutions and that have no marketing authorization (off-label use).

RESULTS

The scoping review identified 57 studies with most data available on their tolerability (68% local, 54% systemic), clinical effects (82%), details on dosage (96%) and routes of application (100%). Information on pharmacokinetic properties was mostly missing and only available for fentanyl, levetiracetam, midazolam, and ondansetron. For seven drugs, less than five articles were identified and no studies on codeine or clonazepam were available.

CONCLUSION

This work provides an overview of current evidence on subcutaneous and off-label used drugs in hospice and palliative care. Although both are common practices, evidence on tolerability and effectiveness, particularly pharmacokinetic data, is limited and the identified information gaps need to be closed. This work establishes a basis for further research in this area.

Multimodal Strategies for the Diagnosis and Management of Refractory Congestion. An Integrated Cardiorenal Approach

Refractory congestion is common in acute and chronic heart failure, and it significantly impacts functional class, renal function, hospital admissions, and survival. In this paper, the pathophysiological mechanisms involved in cardiorenal syndrome and the interplay between heart failure and chronic kidney disease are reviewed. Although the physical exam remains key in identifying congestion, new tools such as biomarkers or lung, vascular, and renal ultrasound are currently being used to detect subclinical forms and can potentially impact its management. Thus, an integrated multimodal diagnostic algorithm is proposed. There are several strategies for treating congestion, although data on their efficacy are scarce and have not been validated. Herein, we review the optimal use and monitorization of different diuretic types, administration route, dose titration using urinary volume and natriuresis, and a sequential diuretic scheme to achieve a multitargeted nephron blockade, common adverse events, and how to manage them. In addition, we discuss alternative strategies such as subcutaneous furosemide, hypertonic saline, and albumin infusions and the available evidence of their role in congestion management. We also discuss the use of extracorporeal therapies, such as ultrafiltration, peritoneal dialysis, or conventional hemodialysis, in patients with normal or impaired renal function. This review results from a multidisciplinary view involving both nephrologists and cardiologists.