|Year : 2020 | Volume
| Issue : 5 | Page : 4-10
Early detection of myocardial damage: A multimodality approach
Giuseppina Novo1, Cinzia Nugara2, Antonella Fava3, Antonio Mantero4, Rodolfo Citro5
1 Department of Health Promotion, Mother and Child Care, Internal Medicine and Medical Specialties, University of Palermo, Division of Cardiology University Hospital P. Giaccone, Palermo, Italy
2 Department of Health Promotion, Mother and Child Care, Internal Medicine and Medical Specialties, University of Palermo, Division of Cardiology University Hospital P. Giaccone, Palermo; Neurolesi Center IRCCS “Bonino Pulejo”, Messina, Italy
3 Department of Cardiology, University Hospital “Città della Salute e Della Scienza”, Molinette Hospital, Turin, Italy
4 EchoCardioService, Milan, Italy
5 Heart Department, University Hospital of Salerno, Salerno, Italy
|Date of Submission||14-Jan-2019|
|Date of Acceptance||17-Feb-2019|
|Date of Web Publication||10-Apr-2020|
Prof. Giuseppina Novo
Department of Health Promotion, Mother and Child Care, Internal Medicine and Medical Specialties, University of Palermo, Division of Cardiology University Hospital P. Giaccone
Source of Support: None, Conflict of Interest: None
Cardiovascular diseases are possible complications of antineoplastic treatment and may lead to premature morbidity and mortality among cancer survivors. A symptom-based follow-up is ineffective, and there are growing evidences that early detection of myocardial damage in patients treated with antineoplastic drugs is the key point to prevent the occurrence of damage and improve the prognosis of these patients. Different techniques have been proposed to monitor cardiac function in oncologic patients such as cardiac imaging (echocardiography, nuclear imaging, and cardiac magnetic resonance) and biomarkers (troponin and natriuretic peptides). The European Association of Cardiovascular Imaging/American Society of Echocardiography consensus document encourages an integrated approach to early detect cardiotoxicity.
Keywords: Cardiotoxicity, deformation imaging, early detection, echocardiography, multimodality approach
|How to cite this article:|
Novo G, Nugara C, Fava A, Mantero A, Citro R. Early detection of myocardial damage: A multimodality approach. J Cardiovasc Echography 2020;30, Suppl S1:4-10
|How to cite this URL:|
Novo G, Nugara C, Fava A, Mantero A, Citro R. Early detection of myocardial damage: A multimodality approach. J Cardiovasc Echography [serial online] 2020 [cited 2021 Mar 8];30, Suppl S1:4-10. Available from: https://www.jcecho.org/text.asp?2020/30/5/4/282278
| Introduction|| |
In recent years, chemotherapy has significantly improved the overall prognosis and survival of several oncologic patients. However, a significant proportion of cancer survivors are living with long-term adverse effects of cancer therapy, involving multiple organ systems.,, Cardiovascular diseases are one of the most frequent of these side effects and may lead to premature morbidity and mortality among cancer survivors.,
For these reasons, there is a growing interest for early detection of myocardial damage in patients treated with antineoplastic drugs in order to readily intervene with cardioprotective strategies, allow the prosecution of antineoplastic treatment, and avoid the need of its discontinuation.
Nowadays, it remains unclear which approach would be best in order to prevent chemotherapy-induced cardiotoxicity (CTX). Main proposed strategies to monitor cardiac function in oncologic patients are cardiac imaging (echocardiography, nuclear imaging, cardiac magnetic resonance [CMR]) and biomarkers (troponin, natriuretic peptides). The choice of different modalities depends on local expertise and availability. Recent available data in the literature encourage the combination of multimodality imaging techniques as well as the use of biomarkers for early detection of cancer therapeutic-related cardiac dysfunction.
| Cardiovascular Complications of Anticancer Drugs|| |
Antineoplastic treatments can induce cardiovascular damage that may appear early or, sometimes, many years after exposure. The majority of studies on CTX focus on patients treated with anthracyclines and trastuzumab. However, cardiotoxic effect has been described even for other classes of treatments such as tyrosine kinases inhibitors, antimetabolites, alkylating agents, taxanes, and radiotherapy., The most common adverse event is a reduction in left ventricular (LV) dysfunction that may progress to overt heart failure (HF); nevertheless, clinical manifestations of CTX are broad and can include arrhythmias, ischemia, valvular heart disease, pericardial disease, arterial and pulmonary hypertension, and thrombosis [Figure 1].
|Figure 1: Cardiovascular complications of anticancer drugs. TKI = tyrosine kinase inhibitors|
Click here to view
Left ventricular dysfunction and heart failure
LV dysfunction and HF are common and serious side effects of cancer treatment. A recent report from the American Society of Echocardiography (ASE) and the European Association of Cardiovascular Imaging (EACVI) proposed a decrease in the left ventricle ejection fraction (LVEF) of more than 10%, to a value <53%, for the diagnosis of cardiac toxicity, and this decrease should be confirmed by repeated cardiac imaging studies 2–3 weeks after the baseline study. The onset of dyspnea, chest pain, peripheral edema, and asthenia is usually preceded by a variable stage of subclinical myocardial dysfunction.
Coronary artery disease and peripheral artery disease
Myocardial ischemia is another side effect of several cancer therapies. The mechanisms by which these drugs cause myocardial ischemia are different and range from a direct vasospastic effect to endothelial injury and acute arterial thrombosis, to long-term changes in lipid metabolism, and consequent premature arteriosclerosis. Previous mediastinal radiotherapy may accelerate drug-related coronary damage.
Severe atherosclerotic and nonatherosclerotic peripheral artery disease in the lower extremities can occur in patients treated with inhibitors of tyrosine kinases or inhibitors of BCR-ABL kinase such as ponatinib.
Valvular and pericardial disease
Antineoplastic drugs do not directly affect cardiac valves, but valvular disease may be observed in patients with cancer for several reasons such as; radiotherapy that causes calcification and fibrosis of the aortic root, aortic cusps, mitral valve annulus, tips and commissures; and infective endocarditis due to pancytopenia associated to chemotherapy and secondary to LV dysfunction.,,,,
Acute pericarditis may occur with the use of anthracyclines, cyclophosphamide, cytarabine, and bleomycin, while chronic pericardial effusion is usually associated with radiotherapy.
Arterial hypertension (AH) is a common side effect of several vascular endothelial growth factor inhibitors such as bevacizumab, sunitinib, and sorafenib. AH is an important cardiovascular risk factor and favor the occurrence of left ventricle dysfunction.
Arrhythmias can be present at baseline in 16%–36% of treated patients with cancer.,, In these patients, we can observe different kind of rhythm disturbs that range from ventricular arrhythmias secondary to QT prolongation, electrolyte disturbances, myocardial ischemia or ventricular dysfunction, to supraventricular arrhythmias, or conduction defects.
Incidence of thromboembolic events in neoplastic patients is high and generally depend on cancer-related factors; however, some anticancer drugs such as thalidomide and cisplatin can have additional effects.,,,,
Pulmonary hypertension is a rare, but serious complication of some cancer agents and stem cell bone marrow transplantation., Dasatinib can induce severe but often reversible precapillary pulmonary hypertension.
Recently, cyclophosphamide and other alkylating agents were suggested as contributing to the development of pulmonary hypertension in oncologic patients.
| Echocardiography: from Conventional to Advanced Evaluation|| |
Echocardiography is the most frequently used technique for routine monitoring of patients treated with antineoplastic treatments. Conventional evaluation provides the use of LVEF as reference parameter before and during chemotherapic treatments., Newer echocardiographic techniques, using three-dimensional (3D) technology or contrast echocardiography, have resulted in significant improvement in the accuracy of LVEF assessment. It was demonstrated that 3D-echocardiography was suitable and reproducible for assessing changes in LV volumes and LVEF compared with CMR and was capable to detect smaller changes in LVEF (~5%).
Contrast agents demonstrated an incremental value in the measurement of LV volume and LVEF when two or more contiguous left ventricle endocardial segments are poorly visualized in apical views., Contrast-enhanced images may provide larger volumes than unenhanced images that are more reproducible with those obtained with CMR.
Unfortunately, decrease of LVEF is detectable when damage is considerable and possibility of recovery reduced, therefore, it is not suitable as an early indicator of CTX., More advanced echocardiographic modalities, in particular, myocardial deformation imaging with speckle-tracking strain analysis, show great potential for detecting early myocardial damage in asymptomatic oncologic patients.,,,, Global longitudinal strain (GLS) is very sensitive in identifying subtle loss of myocardial function.,
Recent studies demonstrated that reduction of GLS during chemotherapic treatments was predictive of CTX., In particular, Sawaya et al., in a prospective study of 81 patients with breast cancer, observed that a longitudinal strain value less negative than 19% after the completion of anthracyclines was predictive of CTX. Diagnostic accuracy increased when cardiac troponin (cTn) was also measured. Negishi et al. demonstrated that an 11% reduction of GLS since baseline value is an independent early predictor of later reductions in EF, incremental to usual predictors in patients at risk for trastuzumab-induced CTX. A recent study demonstrated that strain imaging is a powerful tool to identify an increased number of survivor with an early myocardial injury. Therefore, measuring the percentage variation of GLS between follow-up and baseline seems to be an accurate approach to early detect CTX [Figure 2].
|Figure 2: Variation of global longitudinal strain before and after anthracyclines treatments|
Click here to view
The European Society of Cardiology suggests that measurements of GLS during chemotherapy should ideally be compared with baseline value, and a relative percentage reduction of GLS of <15% from baseline is very likely to predict CTX.
3D speckle-tracking echocardiography (STE) is a promising but not yet validated advanced techniques for the evaluation of myocardial function in the clinical practice. It was demonstrated that GLS evaluated by 3D-STE was superior to biomarkers and to LVEF in predicting future development of CTX.,
Measurement of diastolic function is recommended in cancer patients, and frequently, it is impaired. However, changes in loading conditions associated with chemotherapy (e.g., nausea, vomiting, and diarrhea) can affect E/e' ratio, for these reasons the accuracy of this parameter in oncologic patients is still debated.
Finally, in cancer patients, stress echocardiography could be a further test that reveals the presence of subclinical LV dysfunction and coronary artery disease in patients with an intermediate or high pretest probability.,
In a recent study, Khouri et al. observed that left ventricle contractile reserve, expressed as delta between resting and peak GLS, was significantly lower in patients receiving anthracycline for breast cancer than in the control group. Civelli et al. demonstrated, in a population of adult women with breast cancer, the usefulness of echo stress with dobutamine in identifying subclinical LV dysfunction. In particular, the reduction in contractile reserve (reduction of FE ≥10% from baseline) has proved to be an important prognostic predictor.
| Cardiac Magnetic Resonance and Early Detection of Myocardial Damage|| |
The need for a reliable and accurate detection method for early cardiac damage has encouraged the introduction of the second-line advanced imaging modalities in oncologic patients, including CMR and CMR-based strain imaging., CMR is the gold standard for quantifying biventricular volumes and ejection fraction. In the evaluation of CTX, the added value of CMR is represented by its capability for providing information on tissue characterization, such as edema, hyperemia, fibrosis, and iron overload.
Late gadolinium enhancement is commonly used as an imaging biomarker of discrete myocardial fibrosis in cardiomyopathies, although its significance in CTX is uncertain. Using T1 relaxometry-based approaches, commonly referred to as “T1 mapping,” it is possible to measure myocardial extracellular volume, which has been shown to correlate with the degree of cardiac fibrosis.,, This technique should be a reliable and noninvasive method to detect early CTX, allowing serial monitoring of chemotherapy-induced CTX.,
Finally, LV strain assessment by CMR may be a promising method to monitor subclinical myocardial dysfunction in cancer patients receiving chemotherapy.
Nowadays, CMR is recommended for the quantification of LVEF when the acoustic window is poor at echocardiogram or when we want to confirm the measurement of LVEF before withholding a treatment, because of not wide availability and cost, unfortunately, it cannot be used routinely.
Radionuclide angiography (MUGA) was referred as the gold standard to evaluate left ventricle systolic function in patients undergoing chemotherapy for many years, but the main concern about its use regard radiation exposure. Actually, it is used as an adjunct and complementary technique to echocardiography.,
| Biomarkers|| |
Cardiac biomarkers such as cTn and N-terminal-pro-brain natriuretic peptide (NT-proBNP) are molecular markers suggested to allow earlier detection of drug-induced CTX compared to LVEF measurement.,,
Tn is a serum biomarker of cardiac damage and its elevation in oncological patients has been shown to predict the future development of CTX. Cardinale et al. demonstrated that in patients with cancer treated with high doses of anthracyclines, the increase in cTn allows discrimination between patients with a low risk of developing chemotherapy-induced CTX and those at high risk, which require strict cardiac follow-up. Moreover, troponin elevation may guide an early treatment with cardioprotective treatment with enalapril, with relevant positive consequences on patients prognosis [Table 1]. It has been shown that in a population of patients with breast cancer, the combination of high-sensitivity troponin (hsTn) with GLS measurement might provide the greatest specificity (93% when both are altered) and sensitivity (87%, when one of two parameters is altered) to predict future CTX.
|Table 1: Chronology in the occurrence of cardiac damage in patient undergoing antineoplastic treatment and possible prevention/treatment strategies|
Click here to view
The role of BNP and NT-proBNP to detect subclinical cardiac damage is still under investigation and results of published studies are controversial.,, In particular, some studies demonstrated that BNP levels increase during anticancer therapy and correlated with impairment of diastolic and systolic function.,, However, in other studies, BNP was not predictive of EF change.
Inflammation biomarkers, such as C-reactive protein, cytokines, and parameters of oxidative stress, are under investigation, but their role in early detection of myocardial damage during chemotherapy is not yet established.,,,,
| Multimodality Approach: Incremental Value in Predicting Early Cardiotoxicity|| |
There is increasing available data encouraging the combination of multimodality imaging parameters and techniques for early detection of cardiac dysfunction in oncologic patients [Figure 3].,,,,
In particular, a combination of GLS and hsTn-I showed a better accuracy for the early identification of myocardial damage and was predictive of subsequent cardiac dysfunction in patients receiving trastuzumab after anthracyclines.
EACVI/ASE consensus document encourages an integrated approach to early detect CTX, particularly a strategy that include, in addition to LVEF assessment, the calculation of GLS and the measurement of troponin at baseline and during follow-up in order to compare changes during time is proposed.
However, further studies are needed for wider validation of this approach in the clinical setting.
| Conclusions|| |
Cardio-oncology is a newly emerging branch of cardiology with the aim of monitoring, early detection, prevention, and treatment of CTX related to oncologic treatments.
Early diagnosis of myocardial damage is crucial in this setting in order to avoid overt CTX and HF and to allow the prosecution of antineoplastic treatment.
Although, in recent years, research has made a lot of progress, it is necessary to identify and validate emerging techniques in a multimodal approach in order to increase our capability to early detect myocardial damage in oncologic patients.
Financial support and sponsorship
Conflicts of interest
There are no conflicts of interest.
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