Abstract
Purpose of Review
Elucidating the mechanisms that contribute to adverse cardiovascular (CV) outcomes and reduce quality of life among patients with cancer is paramount. Cancer, certain cancer drugs, radiation therapy, cancer-associated lifestyle disturbances, and cancer-independent comorbidities combine to predispose oncology patients to autonomic dysfunction (AD). This review will explore the assessment, etiology, and clinical implications of AD in cancer patients and will speculate on therapeutic and research opportunities.
Recent Findings
AD is particularly prevalent among patients with advanced cancer, but studies suggest increased prevalence across the entire continuum of cancer survivors compared to cancer-free controls. Data on cancer therapy-induced injury to the autonomic nervous system are limited to small studies. AD has been reported after cranial, neck, and mediastinal radiation therapy. Although AD has been shown to confer increased risk of adverse CV outcomes in cancer-free patients, the prognostic relevance of AD in oncology patients is less well investigated. Markers of AD including elevated resting heart rate (HR), reduced HR variability, and abnormal HR recovery have been associated with shorter survival times in various cancer cohorts. Furthermore, AD has been implicated in the etiology of cancer-related fatigue and exercise limitation.
Summary
Multiple risk factors predispose oncology patients to AD, which is associated with adverse outcomes, including increased mortality, exercise limitation, and fatigue among this cohort. The contribution of AD to overall morbidity and mortality in cancer survivors has largely been overlooked to date. Further investigation is necessary to better understand cancer-treatment specific autonomic injury and to evaluate the role of various pharmacological and non-pharmacological interventions with potential to tackle the sympathovagal imbalance observed in cancer survivors.
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Introduction
Advances in cancer care have improved 5-year survival for all cancer sites from 49% in 1980 to 69% currently, such that there are over 14 million people living with cancer in the USA today [1]. However, improvements in oncology outcomes are undermined by increased cardiovascular (CV) morbidity and mortality among survivors. Multiple factors contribute to increased CV risk in oncology patients, including cardiotoxicity as a consequence of various cancer therapies. Injury to myocardium, pericardium, valves, coronary arteries, and large vessels is well recognized in the aftermath of cancer treatments such as radiation therapy, anthracyclines, and targeted cancer therapies. Although the autonomic nervous system (ANS) is also susceptible to toxicity, autonomic dysfunction (AD) associated with cancer therapies and its contribution to overall morbidity and mortality in cancer cohorts is frequently overlooked. This review will explore the assessment, etiology, and clinical implications of AD in patients with cancer and will highlight therapeutic and research opportunities.
Regulation of Cardiovascular Autonomic Function
The CV ANS can be divided into intrinsic and extrinsic components [2]. The extrinsic cardiac ANS comprises fibers that mediate connections between the heart and the nervous system facilitating delicate modulation of baseline cardiac function. The intrinsic cardiac ANS consists of autonomic nerve fibers within the pericardial sac serving to integrate the signals with the underlying conduction system [3]. The extrinsic cardiac ANS comprises two limbs: the sympathetic nervous system (SNS) and the parasympathetic nervous system (PNS) [4]. Serving a predominant cardio-acceleratory function, activation of the SNS is associated with positive chronotropic and inotropic effects, a reduction of venous capacitance and constriction of resistance vessels [5]. In counterbalance, the PNS serves a predominant cardio-inhibitory function associated with negative chronotropic and inotropic effects, reduced arterial stiffness and increased venous capacitance [6•]. The dynamic interactions between these two limbs together with the integration of additional physiological inputs and reflexes serve to modulate the baseline hemodynamic and electrical functions of the heart and the vasculature [6•].
The sympathetic input to the heart is primarily derived from the major autonomic ganglia, the superior cervical and the thoracic ganglia, located adjacent to the cervical and thoracic spinal cord [7]. These ganglia house the cell bodies of most post-ganglionic neurons whose axons converge to form the superior, middle and inferior cardiac nerves that terminate on the surface of the heart. The parasympathetic input is derived from the nucleus ambiguus of the medulla oblongata, and its preganglionic fibers are carried almost entirely within the vagus nerve. The vagus nerve and its branches converge at a distinct fat pad between the superior vena cava and the aorta, the third fat pad, before continuing its course to interact with the sinoatrial and atrioventricular nodes. The extracardiac inputs of the SNS and PNS further interact with a complex network of intrinsic cardiac neurons known as the epicardial neuron plexus [2]. This provides an additional layer of regulation of autonomic function, and it is increasingly apparent that dysregulation of this layer is implicated in heart rhythm disturbances [3, 8].
The ANS is a dynamic system consisting of an intricate and interactive set of neuronal and humoral feedback mechanisms which act to modulate CV function [9]. Stress-sensitive baroreceptors are located in high-pressure systems (aortic arch and carotid sinus) and low-pressure systems (e.g., systemic veins). Stimulation of these baroreceptors in response to increases in blood pressure (BP) triggers afferent signals to the dorsal medulla of the brainstem with subsequent reduction in sympathetic tone and increase in vagal tone [10, 11]. Stimulation of chemoreceptors within the carotid body by changes in arterial levels of oxygen and carbon dioxide is associated with augmentation of sympathetic tone [6•]. The ANS is further modulated by its bidirectional feedback with the renin-angiotensin-aldosterone system (RAAS) [6•].
Assessment of Cardiovascular Autonomic Function
The complexity of the ANS is reflected by the lack of any single measure that can comprehensively measure autonomic function. Many tests for assessing autonomic function evaluate CV reflexes in response to provocative maneuvers such as regular exercise, isometric exercise, orthostatic testing, deep breathing, and the Valsalva maneuver. BP responses to orthostatic testing and Valsalva maneuver largely reflect sympathetic activity, whereas changes in HR during these stimuli as well as during deep breathing largely reflect parasympathetic modulation [12]. In addition, HR variability (HRV) measures how the RR intervals change over time, and is generally assessed by time domain or frequency domain analysis. A summary of key noninvasive tests for cardiac autonomic function are presented in Table 1. Comprehensive assessment of cardiovascular autonomic function includes incorporating data from a combination of these tests rather than relying on any one technique in isolation.
Etiology of Cardiovascular Autonomic Dysfunction Among Oncology Patients
Multiple factors frequently coexist in oncology patients which predispose to AD (Fig. 1). Direct injury to one or more components of the ANS can occur as a consequence of malignancy itself (e.g. direct tumor invasion or compression) or as a complication of cancer therapies including chemotherapy, surgery, and radiation therapy. Multiple small studies report a prevalence of AD as high as ~ 80% among patients with advanced cancer, and so AD at least in part reflects severity of illness in these patients [20,21,22,23]. In addition, AD can also reflect the burden of cancer-related or cancer-independent comorbidities, as it correlates with risk factors including diabetes and obstructive sleep apnea. Various cancer-associated lifestyle perturbations including emotional stress, sleep disturbances, weight gain, and low cardiorespiratory fitness likely contribute [24•]. Therefore, AD in cancer patients is likely a consequence of an additive or synergistic interaction between one and more of these factors. AD associated with various chemotherapies and radiation therapy is discussed further below.
Chemotherapy-Induced Autonomic Dysfunction
Neurotoxicity is a well-established adverse effect of specific cancer therapies, such as platinum compounds, vinca alkaloids, taxanes, lenalidomide, thalidomide, and bortezomib. In particular, chemotherapy-induced peripheral neuropathy is a common cause of permanent symptoms and disability in cancer survivors [25]. While AD can frequently accompany and may precede motor and sensory manifestations of peripheral neuropathy [26], systematic evaluation for autonomic involvement in oncology patients has been deficient.
Platinum Compounds
The platinum compounds (cisplatin, oxaliplatin, and carboplatin) play an important role in the treatment of many solid tumors, but they have been associated with dose-dependent peripheral neurotoxicity observed in almost half of cisplatin-treated patients and almost all patients receiving oxaliplatin to some extent [27]. However, this neurotoxicity is selective for large sensory neurons, with relative sparing of autonomic neurons [28, 29]. This sparing of the ANS is supported by some small studies that have assessed CV autonomic function. For example, baroreflex sensitivity did not differ when 90 patients with testicular cancer treated with cisplatin-based chemotherapy were compared to 44 patients with testicular cancer managed with orchiectomy alone, and 47 healthy male controls [30]. Similarly, in a study of 16 males with testicular cancer treated with cisplatin, etoposide, and bleomycin, autonomic function as assessed by HR response to both deep breathing at a rate of 6 breaths/min and to Valsalva maneuver was preserved even after high (> 400 mg/m2) doses of cisplatin [28]. In contrast, a small study that included Valsalva maneuvers before and during cisplatin treatment in 11 patients with ovarian adenocarcinoma reported a decrease in the Valsalva ratio to < 1.3 in 2 patients, suggesting occasional involvement of autonomic nerves [31]. PNS dysfunction as suggested by abnormalities in HR response to (i)Valsalva maneuver, (ii)standing up, and/or (iii)deep breathing was also observed in 10 of 28 patients treated with cisplatin, vincristine, and bleomycin for metastatic germ cell cancer, but postural hypotension to implicate sympathetic dysfunction was not seen in any of these patients [32]. However, postural hypotension was observed in 5 of 71 (7%) patients treated with cisplatin-based combination chemotherapy for metastatic germ cell cancer [33]. The values of the 30/15 ratio, a marker of parasympathetic heart innervation, were significantly reduced compared to baseline at 3–4 and 6–8 months after initiation of oxaliplatin-based chemotherapy in 36 patients with colorectal cancer, and diastolic orthostatic hypotension was more frequently observed at 6–8 months [34]. Thus, evidence for AD as a complication of exposure to platinum compounds is mixed and limited to small studies, emphasizing the need for more systematic evaluation.
Vinca Alkaloids
While vincristine is mainly associated with a dose-dependent primary sensory neuropathy, more than one-third of patients manifest signs of ANS injury characterized by orthostatic hypotension, as well as gastrointestinal and genitourinary dysfunction [29]. Small studies have reported vinca alkaloid-induced abnormal variation in BP and HR response to standing, hand grip, deep breathing, and tilt-testing [35,36,37]. Onset of autonomic injury is early following exposure, and recovery is expected following cessation of the drug. This timescale was emphasized in a study of heart rate variability (HRV) in nine children receiving vincristine treatment for acute lymphoblastic leukemia, where HRV was markedly reduced during both induction and reinduction phases, with subsequent recovery after vincristine discontinuation [13]. However, recovery time can vary for vincristine-related neuropathy from months to years [25].
Taxanes
Taxanes (paclitaxel and docetaxel) are associated with peripheral neuropathy, but the association of taxanes with autonomic phenomena is less well understood. Data are conflicting and limited to only a few small studies. In a study of 31 patients with ovarian cancer treated with paclitaxel and carboplatin, orthostatic hypotension was observed in 19% of patients at 3–4 months, which had resolved by the time of repeat assessment at 6–8 months. This study also demonstrated sustained abnormalities in alterations in cardiac rhythm in response to changes from supine to erect position, which is an assessment of parasympathetic heart innervation [38]. Impairment of HRV was observed when 24-h ambulatory ECG monitoring was performed before and 1 day after the second course of paclitaxel treatment in 14 women with breast or ovarian carcinoma, but subsequent recovery was not evaluated [39]. In contrast, docetaxel treatment did not influence parasympathetic cardiac control in 9 anthracycline-treated women with metastatic breast cancer, but abnormalities of sympathetic vascular control were observed in this small study [40]. Ekholm et al. also reported that paclitaxel altered sympathetic control of BP but did not impair vagally mediated HR responses or HRV in 18 women with ovarian or breast cancer who underwent autonomic testing before treatment and again after the second course of paclitaxel [41].
Anthracylines
Anthracyclines can exert toxic effects on the CV autonomic system in addition to toxicity at the myocyte level [42]. Autonomic testing performed in 31 women with stage II/III breast cancer treated with anthracycline-containing chemotherapy regimens and 24 women with similar stage disease treated with CMF (cyclophosphamide, methotrexate, and fluorouracil) revealed that anthracycline-treated patients exhibit a significantly higher number of abnormal tests for CV autonomic function [42]. HRV was assessed for time domain and frequency domain parameters in 20 asymptomatic breast cancer patients with normal left ventricular systolic function, who had been treated with high-dose anthracycline-based chemotherapy and radiation therapy, and abnormalities were found in 85%, particularly with parasympathetic indices [43]. Relatively low doses of epirubicin used in 40 breast cancer patients did not produce persistent alterations in HRV [44]; this may suggest that a dose-response relationship may underlie any anthracycline-mediated autonomic injury similar to that seen in myocardial injury.
Other Cancer Drugs
Bortezomib has been reported to cause an autonomic neuropathy [45, 46] in addition to the well-established major side effect of peripheral neuropathy, but the epidemiology of any bortezomib-associated autonomic injury is poorly understood. Similarly, whether autonomic injury is a feature of the neurotoxicity observed with the immunomodulatory agents, thalidomide and lenalidomide, warrants investigation.
Summary
Data on cancer therapy-induced injury to the ANS are limited to small studies, and the extent of any autonomic involvement in neurotoxicity observed with certain cancer therapies requires more systematic investigation.
Radiation-Induced Autonomic Dysfunction
Radiation-mediated injury to the myocardium, pericardium, valves, coronary arteries, and large vessels is well described; therefore, it is logical that components of the ANS included in the radiation field should also be vulnerable to injury. AD has been reported after cranial, neck, and mediastinal radiation therapy (RT) [47, 48, 49•, 50].
Cranial irradiation is associated with impaired autonomic nervous regulation of the heart (higher LF:HF ratio and diminished orthostatic LF and HF power responses to orthostatic stress; see Table 1) in a study of 29 patients treated for acute lymphoblastic leukemia in childhood who were in remission and at least 20 months following cessation of therapy [47]. Neck irradiation can cause acute, subacute, or chronic baroreflex failure as a consequence of inflammation and fibrosis of carotid arterial walls which can lead to splinting of the carotid sinus baroreceptors, attenuating the arterial baroreflex in response to changes in BP. Failure of this reflex undermines BP homeostasis and can result in labile BP, labile HR, and orthostatic intolerance [48]. Compared to matched controls, survivors of mantle radiation had an almost 4 times higher likelihood of elevated resting HR and over a 5 times higher likelihood of abnormal HR recovery following cessation of exercise, in adjusted analyses [49•]. Prevalence of these autonomic abnormalities increases with time from radiation therapy [49•]. Similarly, exercise treadmill testing and 24-h ECG monitoring in 48 Hodgkin lymphoma survivors who were a median of 14.3 year post diagnosis and who all received mediastinal irradiation, indicate AD as suggested by a monotonous HR in 57%, persistent tachycardia in 31%, and blunted hemodynamic response to exercise in 27% [50]. There was no difference in resting HR or HR recovery in a comparison of cardiorespiratory fitness in 180 early stage breast cancer patients and 180 non-cancer controls [51]. However, in a larger study that compared 448 breast cancer survivors to age- and sex-matched controls, elevated resting HR (23.7 vs 17%, p = 0.013) and abnormal HR recovery (25.9 vs 20.3%, p = 0.048) were observed with higher frequencies in the breast cancer cohort. Two-thirds of these breast cancer survivors had prior radiation therapy, and RT was associated with a higher likelihood of elevated resting HR (adjusted odds ratio 1.54 (95% confidence interval (CI) 1.09, 2.17); p = 0.02) but not abnormal HR recovery (adjusted odds ratio 1.12 (95% CI 0.79, 1.58); p = 0.53) in adjusted analyses [52].
Clinical Significance of Autonomic Dysfunction
Markers of AD such as elevated resting HR, abnormal HR recovery, and reduced HRV are robust predictors of all-cause mortality in many non-cancer populations [14, 15, 53,54,55,56,57]. AD has been shown to confer increased risk of CV morbidity and mortality in cancer-free patients [58]. However, the prognostic relevance of AD in oncology patients is less well investigated. Guo et al. compared HRV in 651 patients with cancer who had undergone 24-h Holter monitoring and observed shorter survival times among those patients with a standard deviation of normal RR intervals of 24-h recording SDNN < 70 msec, independent of age, cancer stage, and performance status [59]. In a study of 4786 patients with stage I–III breast cancer, patients with resting HR in the highest quintile (≥ 85 bpm) had a significantly higher risk of all-cause mortality compared to those in the lowest quintile (≤ 67 bpm) after adjusting for other prognostic factors (hazard ratio 1.57; 95 %CI 1.05–2.35) [60]. Abnormal HR recovery predicted a fourfold increased risk of all-cause mortality in a cohort of 263 Hodgkin lymphoma survivors who were clinically referred for exercise treadmill testing after a median interval from mediastinal radiation of 19 (12, 26) years (age-adjusted hazard ratio 4.60 (95% CI, 1.62–13.02)) [49•]. In a study of 47 male patients with advanced cancer, a Ewing test score (see Table 1) of > 2 was associated with shorter survival [23].
In addition to prognostic relevance, AD appears to have significant functional implications for cancer patients (Fig. 1), having been implicated in the etiology of cancer-related fatigue which is common in patients undergoing cancer treatment and can persist for many years. Breast cancer survivors with reduced HRV report higher levels of fatigue [61, 62]. AD also likely contributes to exercise limitation which can undermine quality of life in cancer survivors. Elevated resting HR and abnormal HR recovery were each associated with mean reductions of ~ 1 metabolic equivalent in exercise capacity during exercise treadmill testing in Hodgkin lymphoma survivors treated with mediastinal radiation after adjusting for potential confounders [49•]. Breast cancer survivors with these abnormalities demonstrate similar reductions in exercise capacity [52].
Therapeutic Opportunities
The ANS warrants consideration as a potential therapeutic target to improve outcomes in cancer patients. However, clinical trials to inform practice are lacking. Randomized controlled trials of agents such as vitamin E, calcium and magnesium infusions, n-acetylcysteine, and glutathione have demonstrated variable efficacy in the prevention of chemotherapy-induced peripheral neuropathy [63], but specific strategies to attenuate injury to the ANS have not been described. Pretreatment with fullerenol prevented doxorubicin-induced alterations in HRV in a rat model of colorectal cancer [64], but such prophylaxis studies in humans are awaited. Other pharmacological interventions that should be explored include beta blockers, RAAS antagonists, and ivabradine. Non-pharmacological interventions with potential to improve sympathovagal imbalance in cancer patients include sleep interventions, stress reduction techniques, and exercise training (Fig. 1). In particular, exercise training for prophylaxis or treatment of AD is very appealing, and there are data supporting the use of exercise training to improve autonomic function in non-cancer patients [65, 66]. For select patients with particularly advanced and symptomatic AD, interventions such as vagal nerve stimulation and carotid baroreceptor stimulation can be considered on a case by case basis [6•].
Knowledge Gaps and Research Opportunities
Risk factors that predispose to chemotherapy-induced peripheral neuropathy include age, dose intensity, cumulative dose, duration of therapy, combination with other neurotoxic therapies, and pre-existing conditions such as diabetes, alcohol abuse, and inherited neuropathies [29, 63]. Whether such factors also influence the likelihood of chemotherapy-induced AD requires investigation. AD has been described in the acute, subacute, and delayed setting in oncology patients; however, the time course, endurance, and reversibility of AD associated with various cancer therapies are poorly understood. It is uncertain if AD can identify a cohort of cancer patients at increased CV risk who warrant increased CV surveillance or risk-mitigating interventions. For example, is AD an early marker of cardiotoxicity that precedes overt myocardial dysfunction? The prognostic and functional implications of AD observed in specific cancer cohorts need to be defined, and whether interventions that target AD can improve outcomes warrant study. Finally, the extent to which AD in any given patient is a marker or mediator of CV disease is difficult to ascertain.
Conclusion
As survivorship continues to improve, understanding the mechanisms that contribute to adverse CV outcomes and reduced quality of life among patients with cancer is paramount. Multiple risk factors predispose oncology patients to AD, which is associated with adverse outcomes, including increased mortality, exercise limitation, and fatigue. The contribution of AD to overall morbidity and mortality in cancer survivors has largely been overlooked to date. There is a need for studies to better understand cancer-treatment specific autonomic injury and to evaluate the role of various pharmacological and non-pharmacological interventions with potential to tackle sympathovagal imbalance in the growing continuum of cancer survivors.
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Ben G.T. Coumbe and John D. Groarke declare that they have no conflict of interest.
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Coumbe, B.G.T., Groarke, J.D. Cardiovascular Autonomic Dysfunction in Patients with Cancer. Curr Cardiol Rep 20, 69 (2018). https://doi.org/10.1007/s11886-018-1010-y
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DOI: https://doi.org/10.1007/s11886-018-1010-y