Beriberi (Thiamine Deficiency) Clinical Presentation
- Author: Dieu-Thu Nguyen-Khoa, MD; Chief Editor: George T Griffing, MD more...
History and Physical Examination
Most patients have no symptoms and signs of thiamine deficiency; therefore, it must be suspected in the appropriate clinical setting. Early symptoms and signs are often nonspecific and vague, such as fatigue. However, high-output cardiac failure should prompt investigation of thiamine deficiency as a cause. The same applies to neuropathic symptoms, particularly in the distal extremities.
Neurologic symptoms of thiamine deficiency are as follows:
- Poor memory, irritability, sleep disturbance
- Wernicke encephalopathy,[12] Korsakoff syndrome
- Bilateral, symmetrical lower extremities paresthesias, burning pain
- Muscle cramps
- Decreased vibratory position sensation
- Absent knee and ankle jerk
- Muscle atrophy
- Foot drop (late stage)
Cardiovascular symptoms are as follows:
- Tachycardia
- Chest pain
- Wide pulse pressure
- Heart failure[26] (orthopnea with or without edema, warm skin due to vasodilation)
- Hypotension, shock
Gastroenterologic symptoms are as follows:
- Anorexia
- Abdominal discomfort
- Constipation
Infantile beriberi symptoms are as follows[23] :
- CHF
- Aphonia
- Absent deep tendon reflex
Alcoholism
Persons with chronic alcoholism have low thiamine intake, impaired thiamine uptake and storage, accelerated destruction of thiamine diphosphate, and varying degrees of energy expenditure. Alcohol is a direct neurotoxin. The effects on the body's supply of thiamine and on brain tissue are detrimental. Persons with known alcoholism should be administered parenteral thiamine as a routine action when they present to a medical facility.
Dieting
A patient’s dieting history also may hold a clue regarding thiamine deficiency. Fad diets often do not contain the necessary amounts of thiamine.
Dialysis and high energy consumption
Dialysis also robs thiamine from the circulation. In addition, states of high energy consumption, such as hyperthyroidism, pregnancy, or severe illness, require more thiamine and other nutrients.
Bariatric weight-loss surgery
Persons with a history of gastric bypass may also have beriberi.[27, 28, 17] For bariatric surgery patients, it is believed that a deficiency occurs primarily during the first 6 months after surgery, when individuals undergo the most rapid weight loss.
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| Population | Age | Allowance, mg/day |
| Recommended Dietary Allowances (RDAs) | ||
| Boys | 9-13 years | 0.9 |
| Men | >14 years | 1.2 |
| Girls | 9-13 years | 0.9 |
| Women | 14-18 years | 1.0 |
| Women | >19 years | 1.1 |
| Pregnant/lactating women | . . . | 1.4 |
| Children | 1-3 years | 0.5 |
| Children | 4-8 years | 0.6 |
| Adequate Intakes (AIs) | ||
| Infant | 0-6 months | 0.2 |
| Infant | 7-12 months | 0.3 |

