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Hyponatremia or hyponatraemia is a low concentration of sodium in the blood. [4] It is generally defined as a sodium concentration of less than 135 mmol/L (135 mEq/L), with severe hyponatremia being below 120 mEq/L. [3] [8] Symptoms can be absent, mild or severe.
Common causes in pediatric patients may be diarrheal illness, frequent feedings with dilute formula, water intoxication via excessive consumption, and enemas. [3] Pseudohyponatremia is a false low sodium reading that can be caused by high levels of fats or proteins in the blood.
It is important to note that sudden restoration of blood volume to normal will turn off the stimulus for continued ADH secretion. Hence, a prompt water diuresis will occur. This can cause a sudden and dramatic increase in the serum sodium concentration and place the patient at risk for so-called "central pontine myelinolysis" (CPM). CPM is a ...
Unsuppressed ADH causes a physiologically inappropriate increase in solute-free water being reabsorbed by the tubules of the kidney to the venous circulation leading to hypotonic hyponatremia (a low plasma osmolality and low sodium levels). [2] The causes of SIADH are commonly grouped into categories including: central nervous system diseases ...
The low GFR causes a lowered rate of osmole excretion, and an increase in the amount of water reabsorbed; thus, hyponatremia occurs when the amount of water intake exceeds the renal water excretion capacity. [2] Medications, such as thiazides and antidepressants, may exacerbate symptoms of hyponatremia. [2]
Diuretic resistance is defined as failure of diuretics to reduce fluid retention (can be measured by low urinary sodium) despite using the maximal dose of drugs. There are various causes for the resistance towards loop diuretics. After initial period of diuresis, there will be a period of "post-diuretic sodium retention" where the rate of ...
This is because co-administration of Digoxin with drugs such as thiazides and loop diuretics which can cause hypokalemia, low serum levels of potassium in the blood. This exacerbates the potential for cardiac arrhythmias because the low levels of potassium reduces the amount of K+ at the ATPase pump and increase calcium levels too much which ...
This can cause hypotension (in severe cases, shock), dizziness (from orthostatic hypotension), dehydration, and salt craving. Differently from mineralocorticoid deficiency, glucocorticoid deficiency does not cause a negative sodium balance (in fact a positive sodium balance may occur).