Resumen

ARANDIA VALDEZ, Rubén; TERCEROS MACHUCA, Mario  y  CAMPUZANO JIMENEZ, Sandra. HIPERKALEMIA Y BRADICARDIA EN UN RECIEN NACIDO PREMATURO PEQUEÑO PARA LA EDAD GESTACIONAL Y DE MUY BAJO PESO. Gac Med Bol [online]. 2005, vol.28, n.2, pp. 67-71. ISSN 1012-2966.

The potassium is the main intracellular catión. The homeostasis of potassium is essential in the hidroelectrolític balance. The homeostasis of potassium this regulated by renal and nonrenal factors (hormones, acid state base, osmolaridad of the extracellular liquid and pharmacological agents). The acid state base has individual importance in the premature ones, in them, the metabolic acidosis. respiratory acidosis or mixed, are common phenomena. The main regulator of potassium is the kidney. The potassium has two important functions within the organism: roll in the cellular metabolism and main determinant of the potential of plasmátic membrane rest. Like consequence, the alterations of the homeostasis of potassium affect the bioeléctric processes of the organism, when depolarizing the excitable cells, among them: the muscular contraction, nervous conduction and electrical bearing of the rate of the myocardium. In the presentation of this clinical case, case of new born of low weight for the gestacional age is described and of very low weight to the birth, this it develops bradicardia severe and apnea, all this secondary one to a process of hiperkalemia.

Palabras llave : hiperkalemia; bradicardia; premature new born.