Association of heart rate variability and baroreceptor sensitivity with biochemical markers in breast cancer patients

Background and Aim: The global burden of breast cancer is on the rise, not sparing countries undergoing rapid urbanization. India is one among the top emerging countries to be affected by this disease. Breast cancer survivors are at increased risk of developing cardiovascular complications due to autonomic dysfunction and oxidative stress. Changes in autonomic balance can be assessed by measuring resting heart rate variability (HRV) and baroreceptor sensitivity (BRS). Serum levels of malondialdehyde and inflammatory markers give an estimate of ongoing oxidative stress. Methods: A study was conducted in two groups: (i) study group consisted of women with breast cancer who have undergone modified radical mastectomy and awaiting radiotherapy and (ii) control group consisted of normal healthy age-matched volunteers. Resting HRV and BRS were measured for participants of both the groups. Estimation of serum oxidative stress markers and inflammatory markers was also done. Results: Decrease in HRV and BRS accompanied by increase in oxidative stress markers and inflammatory markers in circulation was observed in cancer patients when compared to control group. Conclusion: Autonomic dysfunction, high oxidative stress, and decreased BRS were prominent in breast cancer patients, which could expose them to future cardiovascular events.