Tuesday, 13 July 2010

Low potassium level

Low potassium level
The normal potassium level in the blood is 3.5 to 5.0 mEq/L (milliequivalent per liter). Any level below 3.5 mEq/L is called as "low potassium level". Out of 5 people hospitalized in the United States, 1 has a low potassium level. When the potassium level drops to less than 2.5 mEq/L then the condition is life-threatening and in need of emergency medical attention. The effects of low potassium in the body is the formation of a potentially fatal state called as "Hypokalemia". Severe conditions of this disease leads to:

  • serious arrhythmias
  • muscle weakness and myalgia
  • disturbed heart rhythm
  • more risk of hyponatremia with confusion and seizures
Signs and symptoms of low potassium
The symptoms of low potassium are usually mild and at times vague. It is not unusual to have more than one symptom concerning the kidneys, muscles, nerves, heart and gastrointestinal tract. Some of the common symptoms are:
  • weakness or tiredness
  • cramping in arm or leg muscles. This is sometimes severe enough to make it impossible to move arms or legs, similar to paralysis
  • abdominal cramping or bloating
  • nausea or vomiting
  • tingling or numbness
  • passing large quantity of urine or a frequent sensation of thirst
  • irregular psychological behavior like depression, psychosis, delirium, confusion or seeing or hearing things (hallucinations)
  • fainting due to low blood pressure
  • palpitations
  • constipation
  • abnormal heart rhythms (arrhythmias)
Severe hypokalemia is not linked with any symptoms, but may cause:
  • muscle weakness – inability to exert force with one's muscles to the expected degree
  • myalgia or muscle pain
  • disturbed heart rhythm including ectopy (disturbance of the electrical conduction system of the heart where beats arise from the wrong part of the heart muscle)
  • serious arrhythmias (electrical activity of the heart is irregular i.e. faster or slower than normal)
  • greater risk of hyponatremia (an electrolyte disturbance in humans when the sodium concentration in the plasma decreases below 135 mmol/L) with confusion and seizures
The changes in the electrocardiogram pertaining to hypokalemia are:
  • U waves
  • flattened (notched) T waves
  • ST depression
  • prolonged QT interval
Potassium is an electrolyte present in the intracellular fluid and is present in abundant quantity. It regulates the neuromuscular activity of the skeletal, cardiac and smooth muscle. So, when the potassium level becomes low, it results in muscle malfunction and muscle twitchings. Also the heart contracts prematurely. As the muscles that assist in breathing become weak and lead to respiratory arrest. The kidneys become unable to concentrate urine and this leads to excessive urination and thirst. The bowel motility is also hindered. If it becomes very slow, there may be signs of a paralytic ileus. This means that the intestines are somewhat paralyzed due to a decrease in the peristalsis. Sometimes low potassium leads to anorexia. In this, there is a decreased sensation of appetite. Presence of adrenal tumors and hypertension cause the renal potassium stores to be depleted and make the person susceptible to hypokalemia. Use of chemotherapy also causes hypokalemia.

Sometimes bodybuilders take diuretics before competitions to get rid of excess water. This throws out electrolytes from their body. This causes the potassium level to get dangerously low. If this condition is accompanied by starvation, then there may be number of physical problems as well as hypokalemia.

Infants and young children having gastrointestinal ailments that lead to prolonged vomiting and diarrhea can die due to cardiac arrest when the potassium level becomes very low. This is because large quantity of potassium is present in gastric fluids and this is lost during vomiting.


Es la falta de potasio, un electrolito que es necesario en numerosas funciones vitales, tales como: metabolismo celular, equilibrio ácido-base y presión osmótica, síntesis de proteínas y glúcidos y sistemas de transmisión neuromuscular
La cantidad mínima diaria necesaria es de 0.5 mg./kg. que puede verse cubierta con la habitual alimentación diaria.

Por qué se produce su falta
· Gran consumo de laxantes o diuréticos.
· Gran consumo de regaliz o de tabaco de mascar.
· Problemas hormonales: hiperaldosteronismo, afección en la cual la glándula suprarrenal segrega demasiada hormona aldosterona, que aumenta la reabsorción de sodio y agua y la liberación de potasio en los riñones.
· Problemas metabólicos de origen renal.
Hipertensión Arterial Maligna.
Insuficiencia cardíaca.
Síndrome de Cushing (un trastorno que ocurre cuando el cuerpo se expone a niveles altos de la hormona cortisol; también sucede si se toma demasiado cortisol u otras hormonas esteroides).
Exceso de glucocorticoides (se prescriben en los casos de inflamación articular).
 Síndrome paraneoplásico ( manifestaciones del cáncer en sitios que no están directamente afectados por la enfermedad maligna).
Tratamiento intenso con algunos antibióticos.
· Vómitos o diarreas intensos.

Debilidad y calambres musculares, alteraciones neuromusculares, parálisis, parálisis digestiva, insuficiencia respiratoria, trastornos cardiacos y cambios endocrinos.

Exceso de potasio
Su exceso ocasiona problemas: debilidad muscular y hasta paro cardiaco.

Alimentos ricos en potasio
Las cifras son en miligramos de potasio por cada 100 gramos del alimento:
Garbanzos 1.200 mg.
Almendras 700 mg.
Acelgas, espinacas 600 mg.
Banana 400 mg.
Pescado blanco (merluza) 300 mg.
Carnes 300 mg.
Tomate 270 mg.
Yoghurt 190 mg.
Leche 150 mg.
Se halla en gran cantidad en alcauciles,  apios, champiñones, coles, coliflores, endibias, escarolas, lechugas, puerros, zanahorias, dátiles y en general todas las legumbres y frutos secos.