Causal contribution of malignancy to anomalous baroreflex functionality in patients with cancer: An overlooked aspect of cardio-oncology
Fang, C.; Tsai, C.-Y.; Chien, C.-Y.; Chan, S. H. H.
Show abstract
The current trend in cardio-oncology places major emphasis on circulatory toxicity induced by cancer therapy. Whether malignancy itself is a direct contributing factor to cardiovascular dysfunctions and baroreflex dysregulation in patients with cancer, however, has rarely appeared in literature. The present study addressed this largely overlooked aspect of cardio-oncology by evaluating blood pressure, heart rate and baroreflex functionality before and after curative surgery in patients with oral cavity squamous cell carcinoma (OSCC). We found that these patients exhibited reduced baroreflex-mediated sympathetic vasomotor tone and augmented cardiac vagal baroreflex, and such inherent anomalies were readily reversed to levels of healthy controls after surgical removal of the primary tumor. It is concluded that by being more prone to hypotension and bradycardia, anomalous baroreflex functionality causally induced by malignancy predisposes patients with cancer to detrimental cardiovascular abnormalities that may be further exacerbated by cancer therapy.
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