Drug therapy of chronic heart failure in the elderly: the current state of clinical-trial evidence

Benefits of heart failure-specific pharmacotherapy in frail hospitalised patients: a cross-sectional study

OBJECTIVES

Up to 50% of heart failure (HF) patients may be frail and have worse clinical outcomes than non-frail patients. The benefits of HF-specific pharmacotherapy (beta-blockers, ACE-inhibitors/angiotensin-receptor-blockers and mineralocorticoid-receptor-antagonist) in this population are unclear. This study explored whether HF-specific pharmacotherapy improves outcomes in frail hospitalised HF patients.

DESIGN

Observational, multicentre, cross-sectional study.

SETTINGS

Tertiary care hospitals.

PARTICIPANTS

One thousand four hundred and six hospitalised frail HF patients admitted between 1 January 2013 and 31 December 2020.

MEASURES

The Hospital Frailty Risk Score (HFRS) determined frailty status and patients with HFRS ≥5 were classified as frail. The primary outcomes included the days alive and out of hospital (DAOH) at 90 days following discharge, 30-day and 180-day mortality, length of hospital stay (LOS) and 30-day readmissions. Propensity score matching (PSM) compared clinical outcomes depending on the receipt of HF-specific pharmacotherapy.

RESULTS

Of 5734 HF patients admitted over a period of 8 years, 1406 (24.5%) were identified as frail according to the HFRS and were included in this study. Of 1406 frail HF patients, 1025 (72.9%) received HF-specific pharmacotherapy compared with 381 (27.1%) who did not receive any of these medications. Frail HF patients who did not receive HF-specific pharmacotherapy were significantly older, with higher creatinine and brain natriuretic peptide but with lower haemoglobin and albumin levels (p<0.05) when compared with those frail patients who received HF medications. After PSM frail patients on treatment were more likely to have an increased DAOH (coefficient 16.18, 95% CI 6.32 to 26.04, p=0.001) than those who were not on treatment. Both 30-day (OR 0.30, 95% CI 0.23 to 0.39, p<0.001) and 180-day mortality (OR 0.43, 95% CI 0.33 to 0.54, p<0.001) were significantly lower in frail patients on HF treatment but, there were no significant differences in LOS and 30-day readmissions (p>0.05).

CONCLUSION

This study found an association between the use of HF-specific pharmacotherapy and improved clinical outcomes in frail HF hospitalised patients when compared to those who were not on treatment.

TRIAL REGISTRATION NUMBER

ANZCTRN383195.

[Pharmacological treatment of cardiovascular diseases in old age : Geriatic perspective]

Cardiovascular diseases have the highest prevalence in advanced age. Nevertheless, older age groups are frequently underrepresented in randomized controlled trials (RCT). Consequently, in many cases the evidence is often insufficient. Therefore, recommendations from guidelines can only be transferred to this age group to a limited extent. Due to the complexity and vulnerability of geriatric patients, individual considerations in pharmacological therapy are often required. In the following article, the pharmacotherapy of some relevant cardiovascular diseases is discussed from the perspective of a geriatric treatment approach.

Kardiologische Therapie im Alter aus geriatrischer Sicht

Kardiovaskuläre Erkrankungen, wie Arteriosklerose, arterielle Hypertonie, Herzinsuffizienz oder Vorhofflimmern, haben die höchste Prävalenz im fortgeschrittenen Lebensalter. Als Grundlage für die pharmakologische Therapie dienen jeweils die aktuellen Leitlinien. Allerdings bedarf es aufgrund der Komplexizität und Vulnerabilität geriatrischer Patienten eines individuellen Behandlungsansatzes, welcher sich im Einzelfall von Leitlinien unterscheiden kann. Im folgenden Beitrag werden einige relevante kardiovaskuläre Erkrankungen aus der Perspektive eines geriatrischen Behandlungsansatzes beleuchtet sowie Empfehlungen ausgesprochen.

Influence of patient age and comorbid burden on clinician attitudes toward heart failure guidelines

BACKGROUND

Clinical practice guidelines have been criticized for insufficient attention to the unique needs of patients of advanced age and with multiple comorbid conditions. However, little empiric research is available to inform this topic.

METHODS

We conducted telephone interviews with staff physicians and nurse practitioners in 4 VA health care systems. Respondents were asked to rate the usefulness of national heart failure guidelines for patients of different ages and levels of comorbid burden on a 5-point scale and to comment on the reasons for their ratings.

RESULTS

Of 139 clinicians contacted, 65 (47%) completed the interview. Almost half (49%) were women, and 48 (74%) were general internists or family practitioners. On a 5-point scale assessing the usefulness of clinical practice guidelines for heart failure, the mean (SD) response ranged from 4.4 (0.7) for patients younger than 65 years with few comorbid conditions to 3.5 (1.2) for patients older than 80 years with multiple comorbid conditions (P<0.001). The difference in perceived usefulness varied more by patient age than by degree of comorbidity (P = 0.02). Four major concepts underlay the perceived usefulness of guidelines across different patient types: (1) harm of treatment and complexity of the patient's clinical condition and pharmacologic needs, (2) expected benefits of treatment, (3) patient preferences and abilities, and (4) confidence in the validity of guideline recommendations.

CONCLUSION

Clinicians perceive heart failure guidelines to be substantially less useful in patients of older age and with greater comorbid burden. Concerns about the clinical and pharmacologic complexity of these patients and the expected benefits of drug therapy were commonly invoked as reasons for this skepticism.

Heart failure treatment in the elderly

Heart failure is a growing epidemic, particularly in the elderly. As a consequence, we will see a greater number of elderly patients with heart failure in our practices. Elderly heart failure patients have not been well studied. Data suggest that most medical and other therapies are appropriate for elderly individuals. This article identifies the available data regarding treatment of heart failure in elderly patients.

Age and receipt of guideline-recommended medications for heart failure: a nationwide study of veterans

BACKGROUND

Older patients often receive less guideline-concordant care for heart failure than younger patients.

OBJECTIVE

To determine whether age differences in heart failure care are explained by patient, provider, and health system characteristics and/or by chart-documented reasons for non-adherence to guidelines.

DESIGN AND PATIENTS

Retrospective cohort study of 2,772 ambulatory veterans with heart failure and left ventricular ejection fraction <40% from a 2004 nationwide medical record review program (the VA External Peer Review Program).

MAIN MEASURES

Ambulatory use of ACE inhibitors, angiotensin receptor blockers (ARBs), and beta blockers.

RESULTS

Among 2,772 patients, mean age was 73 +/- 10 years, 87% received an ACE inhibitor or ARB, and 82% received a beta blocker. When patients with explicit chart-documented reasons for not receiving these drugs were excluded, 95% received an ACE inhibitor or ARB and 89% received a beta blocker. In multivariable analyses controlling for a variety of patient and health system characteristics, the adjusted odds ratio for ACE-inhibitor and ARB use was 0.43 (95% CI 0.24-0.78) for patients age 80 and over vs. those age 50-64 years, and the adjusted odds ratio for beta blocker use was 0.66 (95% CI 0.48-0.93) between the two age groups. The magnitude of these associations was similar but not statistically significant after excluding patients with chart-documented reasons for not prescribing ACE inhibitors or ARBs and beta blockers.

CONCLUSIONS

A high proportion of veterans receive guideline-recommended medications for heart failure. Older veterans are consistently less likely to receive these drugs, although these differences were no longer significant when accounting for patients with chart-documented reasons for not prescribing these drugs. Closely evaluating reasons for non-prescribing in older adults is essential to assessing whether non-treatment represents good clinical judgment or missed opportunities to improve care.

Endogenous and exogenous cardiac glycosides: their roles in hypertension, salt metabolism, and cell growth

Cardiotonic steroids (CTS), long used to treat heart failure, are endogenously produced in mammals. Among them are the hydrophilic cardenolide ouabain and the more hydrophobic cardenolide digoxin, as well as the bufadienolides marinobufagenin and telecinobufagin. The physiological effects of endogenous ouabain on blood pressure and cardiac activity are consistent with the "Na(+)-lag" hypothesis. This hypothesis assumes that, in cardiac and arterial myocytes, a CTS-induced local increase of Na(+) concentration due to inhibition of Na(+)/K(+)-ATPase leads to an increase of intracellular Ca(2+) concentration ([Ca(2+)](i)) via a backward-running Na(+)/Ca(2+) exchanger. The increase in [Ca(2+)](i) then activates muscle contraction. The Na(+)-lag hypothesis may best explain short-term and inotropic actions of CTS. Yet all data on the CTS-induced alteration of gene expression are consistent with another hypothesis, based on the Na(+)/K(+)-ATPase "signalosome," that describes the interaction of cardiac glycosides with the Na(+) pump as machinery activating various signaling pathways via intramembrane and cytosolic protein-protein interactions. These pathways, which may be activated simultaneously or selectively, elevate [Ca(2+)](i), activate Src and the ERK1/2 kinase pathways, and activate phosphoinositide 3-kinase and protein kinase B (Akt), NF-kappaB, and reactive oxygen species. A recent development indicates that new pharmaceuticals with antihypertensive and anticancer activities may be found among CTS and their derivatives: the antihypertensive rostafuroxin suppresses Na(+) resorption and the Src-epidermal growth factor receptor-ERK pathway in kidney tubule cells. It may be the parent compound of a new principle of antihypertensive therapy. Bufalin and oleandrin or the cardenolide analog UNBS-1450 block tumor cell proliferation and induce apoptosis at low concentrations in tumors with constitutive activation of NF-kappaB.

Endogenous and exogenous cardiac glycosides and their mechanisms of action

Cardiac glycosides have been used for decades to treat congestive heart failure. The recent identification of cardiotonic steroids such as ouabain, digoxin, marinobufagenin, and telocinobufagin in blood plasma, adrenal glands, and hypothalamus of mammals led to exciting new perspectives in the pathology of heart failure and arterial hypertension. Biosynthesis of ouabain and digoxin occurs in adrenal glands and is under the control of angiotensin II, endothelin, and epinephrine released from cells of the midbrain upon stimulation of brain areas sensing cerebrospinal Na(+) concentration and, apparently, the body's K(+) content. Rapid changes of endogenous ouabain upon physical exercise may favor the economy of the heart by a rise of intracellular Ca(2)(+) levels in cardiac and atrial muscle cells. According to the sodium pump lag hypothesis, this may be accomplished by partial inhibition of the sodium pump and Ca(2+) influx via the Na(+)/Ca(2+) exchanger working in reverse mode or via activation of the Na(+)/K(+)-ATPase signalosome complex, generating intracellular calcium oscillations, reactive oxygen species, and gene activation via nuclear factor-kappaB or extracellular signal-regulated kinases 1 and 2. Elevated concentrations of endogenous ouabain and marinobufagenin in the subnanomolar concentration range were found to stimulate proliferation and differentiation of cardiac and smooth muscle cells. They may have a primary role in the development of cardiac dysfunction and failure because (i) offspring of hypertensive patients evidently inherit elevated plasma concentrations of endogenous ouabain; (ii) such elevated concentrations correlate positively with cardiac dysfunction, hypertrophy, and arterial hypertension; (iii) about 40% of Europeans with uncomplicated essential hypertension show increased concentrations of endogenous ouabain associated with reduced heart rate and cardiac hypertrophy; (iv) in patients with advanced arterial hypertension, circulating levels of endogenous ouabain correlate with BP and total peripheral resistance; (v) among patients with idiopathic dilated cardiomyopathy, high circulating levels of endogenous ouabain and marinobufagenin identify those individuals who are predisposed to progressing more rapidly to heart failure, suggesting that endogenous ouabain (and marinobufagenin) may contribute to toxicity upon digoxin therapy. In contrast to endogenous ouabain, endogenous marinobufagenin may act as a natriuretic substance as well. It shows a higher affinity for the ouabain-insensitive alpha(1) isoform of Na(+)/K(+)-ATPase of rat kidney tubular cells and its levels are increased in volume expansion and pre-eclampsia. Digoxin, which is synthesized in adrenal glands, seems to counteract the hypertensinogenic action of ouabain in rats, as do antibodies against ouabain, for example, (Digibind) and rostafuroxin (PST 2238), a selective ouabain antagonist. It lowers BP in ouabain- and adducin-dependent hypertension in rats and is a promising new class of antihypertensive medication in humans.