Initial Workup for Chronic Fatigue with Poor Oral Intake, Chronic Alcohol Use, and Smoking

Immediate Priority Assessment

Evaluate for hepatic encephalopathy and liver dysfunction, as chronic alcohol use causes both liver failure and cardiac injury, with symptoms including fatigue, altered mental status, and poor oral intake, according to the American Association for the Study of Liver Diseases 1, 2
Administer IV thiamine before any glucose-containing solutions, as thiamine deficiency occurs predominantly in patients with alcohol use disorder and causes cerebral symptoms that cannot be clinically differentiated from other causes of fatigue, as recommended by the American Association for the Study of Liver Diseases 1, 2
Assess for malnutrition, as poor oral intake combined with alcohol use creates malnutrition that exacerbates fatigue, according to the American Association for the Study of Liver Diseases 1, 2
Evaluate renal function and electrolytes including sodium, as renal dysfunction and hyponatremia independently increase risk of developing encephalopathy and fatigue in patients with chronic alcohol use, as noted by the American Association for the Study of Liver Diseases 1, 2

Use a 0-10 numeric rating scale at initial evaluation, as scores of 4-10 indicate moderate to severe fatigue requiring focused evaluation, and scores of 7 or higher correlate with marked decreases in physical functioning, according to the National Comprehensive Cancer Network 4, 5
Assess fatigue onset, pattern, duration, changes over time, and interference with daily function, as this guides treatment selection and helps differentiate between multiple potential causes, as recommended by the National Comprehensive Cancer Network 4, 3
Screen for pain, emotional distress, sleep disturbance, anemia, nutritional deficiencies, activity level, medication side effects, and comorbid conditions, as these are potential contributing factors to fatigue, according to the National Comprehensive Cancer Network 4, 5

Assess for muscle wasting and signs of malnutrition, particularly in the context of poor oral intake, as recommended by the American Association for the Study of Liver Diseases 1, 2
Evaluate mental status and cognitive function, as alcohol use, thiamine deficiency, and hepatic encephalopathy all cause overlapping neurological symptoms that cannot be differentiated clinically, according to the American Association for the Study of Liver Diseases 1, 2

Never assume fatigue is solely due to one cause in this population, as chronic alcohol use affects multiple organ systems simultaneously, and each requires specific evaluation, as noted by the American Association for the Study of Liver Diseases 1, 2
Do not delay thiamine administration while awaiting laboratory results, as recommended by the American Association for the Study of Liver Diseases 1, 2
Recognize that normal ammonia levels do not exclude hepatic encephalopathy, as clinical presentation and response to therapy may be the best diagnostic support, according to the American Association for the Study of Liver Diseases 1, 2
Brain imaging should be performed in every patient with chronic liver disease and unexplained alteration of brain function to exclude structural lesions, as recommended by the American Association for the Study of Liver Diseases 1, 2

Reassess fatigue severity after treating identified causes, as failure to improve indicates need for additional evaluation, according to the American Society of Clinical Oncology 5, 3
Provide alcohol cessation counseling and support, as continued use will prevent improvement in all identified conditions, as recommended by the American Heart Association 6
Offer smoking cessation interventions, as this compounds cardiovascular and overall health risks, according to the American Heart Association 6