Key result
Anthracycline-containing chemotherapy in breast cancer survivors was associated with significantly prolonged inter-atrial electromechanical delay (19.7 vs 14.7 ms, p=0.001) and impaired diastolic function compared to healthy controls.
Why the study?
Does anthracycline-containing chemotherapy prolong atrial electromechanical delay and impair mechanical function in patients with breast cancer compared to healthy subjects?
Case-Control (n=95)
Single-blind
No
Does anthracycline-containing chemotherapy prolong atrial electromechanical delay and impair mechanical function in patients with breast cancer compared to healthy subjects?
Absolute Event Rate: 19.7% vs 14.7%
p-value: p=0.001
Anthracycline therapy in breast cancer patients is associated with prolonged atrial electromechanical delay and impaired diastolic function, which may contribute to the development of atrial arrhythmias.
May signal elevated atrial arrhythmia risk post-anthracycline therapy; leaves open whether targeted screening alters outcomes in breast cancer survivors.
BACKGROUND:: Atrial electromechanical delay (EMD) is used to predict atrial fibrillation, measured by echocardiography. OBJECTIVES:: The aim of this study was to assess atrial EMD and mechanical function after anthracycline-containing chemotherapy. METHODS:: Fifty-three patients with breast cancer (48 ± 8 years old) who received 240 mg/m2of Adriamycin, 2400 mg/m2 of cyclophosphamide, and 960 mg/m2 of paclitaxel were included in this retrospective study, as were 42 healthy subjects (47 ± 9 years old). Echocardiographic measurements were performed 11 ± 7 months (median 9 months) after treatment with anthracyclines. RESULTS:: Left intra-atrial EMD (11.4 ± 6.0 vs. 8.1 ± 4.9, p=0.008) and inter-atrial EMD (19.7 ± 7.4 vs. 14.7 ± 6.5, p=0.001) were prolonged; LA passive emptying volume and fraction were decreased (p=0.0001 and p=0.0001); LA active emptying volume and fraction were increased (p=0.0001 and p=0.0001); Mitral A velocity (0.8 ± 0.2 vs. 0.6 ± 0.2, p=0.0001) and mitral E-wave deceleration time (201.2 ± 35.6 vs. 163.7 ± 21.8, p=0.0001) were increased; Mitral E/A ratio (1.0 ± 0.3 vs. 1.3 ± 0.3, p=0.0001) and mitral Em (0.09 ± 0.03 vs. 0.11 ± 0.03, p=0.001) were decreased; Mitral Am (0.11 ± 0.02 vs. 0.09 ± 0.02, p=0.0001) and mitral E/Em ratio (8.8 ± 3.2 vs. 7.6 ± 2.6, p=0.017) were increased in the patients. CONCLUSIONS:: In patients with breast cancer after anthracycline therapy: Left intra-atrial, inter-atrial electromechanical intervals were prolonged. Diastolic function was impaired. Impaired left ventricular relaxation and left atrial electrical conduction could be contributing to the development of atrial arrhythmias. FUNDAMENTO:: Atraso eletromecânico atrial (AEA) é utilizado para prever fibrilação atrial, medido pela ecocardiografia. OBJETIVOS:: O propósito deste estudo era verificar o AEA e a função mecânica após quimioterapia com antraciclinas. MÉTODOS:: Cinquenta e três pacientes com câncer de mama (48 ± 8 anos) que receberam 240 mg/m2 de adriamicina, 2400 mg/m2 de ciclofosfamida, e 960 mg/m2 de paclitaxel foram incluídas neste estudo retrospectivo, além de 42 indivíduos saudáveis (47 ± 9 anos). Medidas ecocardiográficas foram realizadas por aproximadamente 11 ± 7 meses (média de 9 meses) após tratamento com antraciclinas. RESULTADOS:: AEA esquerdo intra-atrial (11,4 ± 6,0 vs. 8,1 ± 4,9, p=0,008) e AEA interarterial (19,7 ± 7,4 vs. 14,7 ± 6,5, p=0,001) foram prolongados; Volume de esvaziamento passivo e fracionamento de AE diminuíram (p=0,0001 e p=0,0001); Volume de esvaziamento ativo e fracionamento de AE (p=0,0001 e p=0,0001); Tempo de aceleração mitral A (0,8 ± 0,2 vs. 0,6 ± 0,2, p=0,0001) e de desaceleração de onda-E mitral (201,2 ± 35,6 vs. 163,7 ± 21,8, p=0,0001) aumentarão; Razão mitral E/A (1,0 ± 0,3 vs. 1,3 ± 0,3, p=0,0001) e mitral Em (0,09 ± 0,03 vs. 0,11 ± 0,03, p=0,001) diminuíram; Razão mitral Am (0,11 ± 0,02 vs. 0,09 ± 0,02, p=0,0001) e mitral E/Em (8,8 ± 3,2 vs. 7,6 ± 2,6, p=0,017) aumentaram nos pacientes. CONCLUSÕES:: Em pacientes com câncer de mama após terapia com antraciclina: intervalos eletromecânicos intra-atriais esquerdos, intra-atriais foram prolongados. A função diastólica foi prejudicada. O relaxamento ventricular esquerdo foi prejudicado, e a condução elétrica atrial esquerda pode estar contribuindo para o desenvolvimento de arritmias atriais.
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Yaylalı et al. (2016) conducted a case-control in Breast Cancer (n=95). Anthracycline-containing chemotherapy vs. Healthy controls was evaluated on Inter-atrial electromechanical delay (ms) (p=0.001). Anthracycline-containing chemotherapy in breast cancer survivors was associated with significantly prolonged inter-atrial electromechanical delay (19.7 vs 14.7 ms, p=0.001) and impaired diastolic function compared to healthy controls.
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