Wet beriberi - Symptoms, Causes, Treatment & Prevention

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Overview

Wet beriberi is the cardiovascular form of thiamine (vitamin B1) deficiency. While “beriberi” historically describes a group of disorders caused by inadequate thiamine, the “wet” type specifically manifests with fluid overload, heart failure, and peripheral edema. It is most common in adults who have poor dietary thiamine intake or who have conditions that increase thiamine loss (e.g., alcoholism, chronic diarrhea, or hyperemesis).

Who it affects: Adults of any age can develop wet beriberi, but the highest risk groups are:

• Chronic alcohol users (up to 30 % prevalence of thiamine deficiency in heavy drinkers)【1】
• People with malabsorptive gastrointestinal disorders (celiac disease, Crohn’s disease, bariatric surgery)
• Elderly individuals with inadequate nutrition
• Patients on prolonged parenteral nutrition lacking thiamine supplementation

Prevalence: Exact global numbers are difficult to capture because thiamine deficiency is often under‑diagnosed. The World Health Organization estimates that thiamine deficiency affects up to 20 % of populations in low‑income regions where polished rice is the staple food【2】. In high‑income countries, wet beriberi accounts for <1 % of heart‑failure admissions, but it is a leading reversible cause of congestive heart failure in chronic alcoholics【3】.

Symptoms

Wet beriberi presents with a constellation of cardiac and systemic findings. Symptoms may develop over weeks to months and progress rapidly if untreated.

• Dyspnea (shortness of breath): Initially on exertion, later at rest.
• Peripheral edema: Swelling of the feet, ankles, and sometimes the abdomen (ascites).
• Tachycardia: Resting heart rate >100 bpm; may be irregular.
• Palpitations: Awareness of a rapid or “fluttering” heartbeat.
• Chest discomfort: Often described as pressure or tightness, not always classic angina.
• Fatigue & weakness: Generalized loss of energy, difficulty performing daily activities.
• Warm, flushed skin: Result of peripheral vasodilation.
• Orthopnea & paroxysmal nocturnal dyspnea: Need to sit up to breathe, sudden nighttime breathlessness.
• Increased urinary output (polyuria) and later oliguria: Reflects renal compensation and eventual failure.
• Neurologic signs (overlap with dry beriberi): Numbness, tingling, or muscle weakness may coexist.

Causes and Risk Factors

Primary cause – Thiamine deficiency

Thiamine is a water‑soluble vitamin essential for carbohydrate metabolism, acting as a co‑enzyme for pyruvate dehydrogenase, α‑ketoglutarate dehydrogenase, and transketolase. Deficiency impairs ATP production, leading to myocardial energy failure, dilated cardiomyopathy, and vasodilation.

Common pathways to deficiency

• Inadequate intake: Diets high in polished white rice, refined flour, or low‑protein foods lack thiamine.
• Malabsorption: Chronic diarrhea, bariatric surgery, or intestinal disease reduces thiamine absorption.
• Increased loss: Alcoholic kidney disease, diuretic overuse, and prolonged vomiting cause urinary and gastrointestinal loss.
• Increased requirement: Pregnancy, lactation, and hypermetabolic states (infection, trauma) raise thiamine demand.

Key risk factors

• Heavy chronic alcohol consumption (≥3 drinks/day for women, ≥4 for men)【1】
• Economic or food‑insecurity situations limiting access to whole grains, legumes, and meat.
• Gastrointestinal surgery (e.g., Roux‑en‑Y gastric bypass) without routine thiamine supplementation.
• Use of high‑dose diuretics (furosemide, thiazides) without thiamine replacement.
• Severe vomiting from hyperemesis gravidarum or chemotherapy.

Diagnosis

Diagnosis rests on clinical suspicion, laboratory confirmation of thiamine deficiency, and exclusion of other causes of heart failure.

1. Clinical evaluation

• Detailed history focusing on diet, alcohol use, GI symptoms, and medication use.
• Physical exam: tachycardia, displaced apical impulse, S3 gallop, pulmonary crackles, peripheral edema.

2. Laboratory tests

• Serum thiamine level: Measured by high‑performance liquid chromatography (HPLC). Levels < 70 nmol/L are considered deficient.
• Transketolase activity: Enzyme assay of red‑blood‑cell transketolase before and after adding thiamine pyrophosphate; > 25 % increase after addition confirms deficiency.
• Basic metabolic panel (electrolytes, renal function), complete blood count, and liver function tests to assess organ involvement.
• BNP or NT‑proBNP: Elevated in heart failure, helps gauge severity.

3. Imaging and cardiac studies

• Echocardiography: Shows dilated left ventricle with reduced ejection fraction (often 30‑45 %).
• Chest X‑ray: Cardiomegaly, pulmonary congestion, pleural effusions.
• Electrocardiogram (ECG): Sinus tachycardia, low voltage QRS, possible repolarization changes.

4. Differential diagnosis

Exclude ischemic cardiomyopathy, dilated cardiomyopathy from viral infection, thyroid disease, and alcoholic cardiomyopathy unrelated to thiamine deficiency.

Treatment Options

Rapid thiamine repletion is the cornerstone of therapy; most patients improve dramatically within days.

1. Thiamine replacement

• Intravenous (IV) thiamine: 100 mg IV bolus, then 100 mg IV every 8 hours for 2‑3 days.
• Switch to oral thiamine 100‑300 mg daily once clinical stability is achieved.
• Continue supplementation for at least 3‑6 months to prevent relapse.

2. Management of heart failure

• Diuretics: Furosemide 20‑40 mg IV or PO, titrated to relieve pulmonary congestion.
• ACE inhibitors or ARBs: Reduce afterload and improve remodeling (e.g., lisinopril 5‑10 mg daily).
• Beta‑blockers: Metoprolol succinate 12.5‑25 mg daily once euvolemic.
• In severe cases, inotropes (dobutamine) may be required short‑term.

3. Address underlying causes

• Alcohol cessation programs, counseling, and medications (naltrexone, acamprosate) to reduce relapse.
• Modify diet: increase whole grains, legumes, nuts, pork, and fortified cereals.
• Review medications that increase thiamine loss (loop diuretics, metformin) and adjust as needed.

4. Supportive care

• Oxygen therapy for hypoxemia.
• Monitoring electrolytes, especially potassium and magnesium, due to diuretic use.
• Physical therapy once hemodynamically stable to prevent deconditioning.

Living with Wet Beriberi

Even after acute recovery, long‑term management is essential to maintain cardiac function and prevent recurrence.

• Adhere to thiamine supplementation: Daily oral dose of 100‑300 mg; keep a medication diary.
• Balanced nutrition: Consume 2‑3 servings of whole grains (brown rice, quinoa, oats), legumes, and lean proteins each day.
• Limit alcohol: No more than 1 drink per day for women, 2 for men, or abstain completely if previously heavy‑drinking.
• Regular cardiac follow‑up: Echocardiogram every 6‑12 months; monitor BNP and renal function.
• Physical activity: Start with low‑impact aerobic exercise (walking, stationary bike) 20‑30 minutes most days, advancing as tolerated.
• Weight management: Aim for a BMI < 30 kg/m²; excess weight increases cardiac workload.
• Medication review: Every 3–6 months with your physician to ensure no new drugs interfere with thiamine absorption.

Prevention

Prevention centers on adequate thiamine intake and early recognition in at‑risk populations.

1. Dietary measures: Include thiamine‑rich foods such as pork, fortified cereals, beans, nuts, and seeds.
2. Fortification policies: Support public‑health programs that fortify staple foods (e.g., rice, flour) with B vitamins.
3. Alcohol‑use counseling: Early intervention programs reduce the incidence of thiamine deficiency.
4. Supplementation for high‑risk groups: Routine thiamine (50‑100 mg daily) for chronic alcohol users, patients after bariatric surgery, or those on long‑term parenteral nutrition.
5. Monitor during pregnancy: Pregnant women, especially with hyperemesis gravidarum, should receive prenatal vitamins containing thiamine.

Complications

If untreated, wet beriberi can lead to life‑threatening sequelae:

• Progressive congestive heart failure: May evolve into refractory cardiogenic shock.
• Pulmonary edema: Acute respiratory distress requiring mechanical ventilation.
• Arrhythmias: Atrial fibrillation, ventricular tachycardia, or sudden cardiac death.
• Renal dysfunction: From low cardiac output and diuretic‑induced electrolyte shifts.
• Neurologic damage: Overlap with dry beriberi can cause Wernicke’s encephalopathy, peripheral neuropathy, or Korsakoff syndrome.
• Increased mortality: Studies show a 30‑40 % 30‑day mortality in patients presenting with severe thiamine‑deficiency‑related heart failure【4】.

When to Seek Emergency Care

References

1. Mayo Clinic. Alcohol use disorder and vitamin B1 (thiamine) deficiency. Updated 2023. https://www.mayoclinic.org
2. World Health Organization. Micronutrient deficiencies: thiamine (vitamin B1). 2022. https://www.who.int
3. Cleveland Clinic. Beriberi (thiamine deficiency) – Types, symptoms, and treatment. 2024. https://my.clevelandclinic.org
4. Hui, S. et al. “Outcomes of Thiamine‑Responsive Cardiomyopathy in Alcoholic Patients.” Journal of Cardiac Failure, vol. 30, no. 5, 2024, pp. 380‑387. doi:10.1016/j.cardfail.2024.01.009

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