What is the Latest on Dysphagia?
The Question
Among individuals with dysphagia, is the use of thickened liquids versus thin liquids associated with better clinical outcomes (lower risks of aspiration, pneumonia, death), hydration and quality of life?
Recommendation
Dementia and/or Parkinson's Disease
In individuals with dementia and/or Parkinson’s disease who have swallowing disorders/dysphagia, the effects of thickened liquids are uncertain. This is based on limited evidence, which suggests that thickened liquids compared to regular fluids (given in chin-down head posture) may have an immediate effect on decreasing the risk of aspiration; however, greater adverse effects (e.g. dehydration, urinary tract infection, fever and possibly pneumonia) and increased dissatisfaction with thickened fluids have been reported over three months.
Post-Stroke
In individuals with post-stroke dysphagia, limited evidence suggests no difference in the risk of pneumonia when individuals consume thin liquids, using safe swallowing strategies (such as proper positioning of the body, head or neck; oral care; intake of thin water between meals) compared with those consuming thickened liquids only. There is insufficient evidence to draw conclusions on whether the long-term use of thickened liquid is related to a higher incidence of dehydration or poorer quality of life (QoL) in this population.
Maxillary Carcinoma
In individuals with maxillary carcinoma who underwent total maxillectomy, limited evidence suggests that xanthan gum-based thickened liquid, compared to regular liquids, can improve hydration status and dysphagia-related QoL.
Additional research is required to establish a stronger quality of evidence for the risks and benefits of the use of thickened liquids for different patient populations with dysphagia.
Country-specific Guidelines
A 2022 guideline from the Danish Centre for Clinical Guidelines for oropharyngeal dysphagia provides a weak recommendation against the use of textured modified liquids based on no difference between thickened and thin fluids on the risk of pneumonia or death and reduced QoL.
The 2018 ESPEN guidelines on clinical nutrition in neurology suggests that texture-modified diets and thickened liquids may reduce aspiration in individuals with stroke and dysphagia and may lead to reduced energy and fluid intake. The guidelines acknowledge a lack of evidence on positive and adverse effects of texture-modified diets in stroke patients with dysphagia.
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