Oral Complications of Chemotherapy and Head/Neck Radiation (PDQ®): Supportive care - Health Professional Information [NCI] - Conditions Affected By Both Chemotherapy and Head / Neck Radiation
In cancer patients, loss of appetite can also occur secondary to mucositis, xerostomia, taste loss, dysphagia, nausea, and vomiting. Quality of life is compromised as eating becomes more problematic. Oral pain with eating may lead to selection of foods that do not aggravate the oral tissues, often at the expense of adequate nutrition. Nutritional deficiencies can be minimized by modifying the texture and consistency of the diet and by adding more frequent meals and snacks to increase calories and protein. Ongoing nutrition assessment and counseling with a registered dietitian should be part of the patient's treatment plan.
Many patients who receive radiation therapy alone are able to tolerate soft foods; however, as treatment progresses, most patients must transition to liquid diets using high-calorie, high-protein liquid nutritional supplements, and some may require enteral feeding tubes to meet their nutritional needs. Almost all patients receiving concurrent chemotherapy and radiation therapy will become fully dependent on enteral nutritional support within 3 to 4 weeks of therapy. Numerous studies have demonstrated the benefit of enteral feedings initiated at the onset of treatment, before significant weight loss has occurred.[22,23]
Oral nutrition is reinstituted after treatment has concluded and the radiated site has adequately healed. Oral nutrition often requires a team approach. The assistance of a speech and swallowing therapist to assess for any swallowing dysfunction resulting from surgery or treatment is often necessary and beneficial in easing the transition back to solid foods. The number of tube feedings can be decreased as a patient's oral intake increases, with tube feeding being discontinued when 75% of a patient's nutrition needs are being met orally. Although most patients will resume adequate oral intake, many will continue to experience chronic complications such as taste changes, xerostomia, and varying degrees of dysphagia that can affect their nutritional status and quality of life.[20,21]
Cancer patients undergoing high-dose chemotherapy and/or radiation therapy can experience fatigue related to either the disease or its treatment. These processes can produce sleep deprivation or metabolic disorders that collectively contribute to compromised oral status. For example, the fatigued patient will likely have impaired compliance with mouth care protocols designed to otherwise minimize risk of mucosal ulceration, infection, and pain. In addition, biochemical abnormalities are likely involved in many patients. The psychosocial component can also play a major role, with depression contributing to overall fatigue. (Refer to the PDQ summary on Fatigue for more information.)
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