Hypokalemia

I just got off the hospital for Hypokalemia. I had a dangerously low level of potassium that left my leg muscles practically paralyzed for some time. My legs were too weak I literally cannot stand on my own two feet. I found myself in the Emergency Room palpitating and having a hard time breathing. After several days in the hospital, the doctors were able to find out the primary causes of my condition. One of which is Renal tubular acidosis, where my kidneys let pass too much potassium and Multiple Nodular Goiter which induces Hyperthyroidism also causing Potassium in my body to deplete. I found this article below regarding this condition.

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Hypokalemia

Author: David Garth, MD, Attending Physician, Department of Emergency Medicine, Mary Washington Hospital

SOURCE: http://emedicine.medscape.com/article/767448-overview

Introduction

Background

Potassium is one of the body's major ions. Nearly 98% of the body's potassium is intracellular. The ratio of intracellular to extracellular potassium is important in determining the cellular membrane potential. Small changes in the extracellular potassium level can have profound effects on the function of the cardiovascular and neuromuscular systems.1,2,3

The kidney determines potassium homeostasis, and excess potassium is excreted in the urine.

The reference range for serum potassium level is 3.5-5 mEq/L, with total body potassium stores of approximately 50 mEq/kg (ie, approximately 3500 mEq in a 70-kg person).

Hypokalemia is defined as a potassium level less than 3.5 mEq/L.

Moderate hypokalemia is a serum level of 2.5-3 mEq/L.

Severe hypokalemia is defined as a level less than 2.5 mEq/L.

Pathophysiology

Hypokalemia may result from conditions as varied as renal or GI losses, inadequate diet, transcellular shift (movement of potassium from serum into cells), and medications.

Frequency

United States

As many as 20% of hospitalized patients are hypokalemic; however, hypokalemia is clinically significant in only about 4-5% of these patients. Severe hypokalemia is relatively uncommon.

Up to 14% of outpatients who undergo laboratory testing are found to be mildly hypokalemic.

Approximately 80% of patients who are receiving diuretics become hypokalemic.

Sex

Incidence is equal in males and females.

Clinical

History

The history may be vague. Patients are often asymptomatic, particularly with mild hypokalemia. Symptoms are often due to the underlying cause of the hypokalemia rather than the hypokalemia itself. Hypokalemia should be suggested by a constellation of symptoms that involve the GI, renal, musculoskeletal, cardiac, and nervous systems. The patient's medications should be reviewed to ascertain whether any of them could cause hypokalemia.

Common symptoms include the following:

• Palpitations
• Skeletal muscle weakness or cramping
• Paralysis, paresthesias
• Constipation4
• Nausea or vomiting
• Abdominal cramping
• Polyuria, nocturia, or polydipsia
• Psychosis, delirium, or hallucinations
• Depression

Physical

Findings that are consistent with severe hypokalemia may include the following:

• Signs of ileus
• Hypotension
• Ventricular arrhythmias5
• Cardiac arrest
• Bradycardia or tachycardia
• Premature atrial or ventricular beats
• Hypoventilation, respiratory distress
• Respiratory failure
• Lethargy or other mental status changes
• Decreased muscle strength, fasciculations, or tetany
• Decreased tendon reflexes
• Cushingoid appearance (eg, edema)

Causes

• Renal losses
• Renal tubular acidosis
• Hyperaldosteronism
• Magnesium depletion
• Leukemia (mechanism uncertain)
• GI losses (source may be medical or psychiatric6 , ie, anorexia or bulimia)
• Vomiting or nasogastric suctioning
• Diarrhea
• Enemas or laxative use
• Ileal loop
• Medication effects
• Diuretics (most common cause)
• Beta-adrenergic agonists
• Steroids
• Theophylline
• Aminoglycosides
• Transcellular shift
• Insulin
• Alkalosis
• Malnutrition or decreased dietary intake, parenteral nutrition