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Original Article
Cardiology
Change of voltage-gated potassium channel 1.7 expressions in monocrotaline-induced pulmonary arterial hypertension rat model
Hyeryon Lee, Kwan Chang Kim, Young Mi Hong
Clin Exp Pediatr. 2018;61(9):271-278.   Published online September 15, 2018

Purpose: Abnormal potassium channels expression affects vessel function, including vascular tone and proliferation rate. Diverse potassium channels, including voltage-gated potassium (Kv) channels, are involved in pathological changes of pulmonary arterial hypertension (PAH). Since the role of the Kv1.7 channel in PAH has not been previously studied, we investigated whether Kv1.7 channel expression changes in the lung tissue of a monocrotaline...
Neurology
Long-term prenatal stress increases susceptibility of N-methyl-D-aspartic acid-induced spasms in infant rats
Hyeok Hee Kwon, Taekwan Lee, Jinpyo Hong, Dong Woon Kim, Joon Won Kang
Clin Exp Pediatr. 2018;61(5):150-155.   Published online May 28, 2018
Purpose

Infantile spasms, also known as West syndrome, is an age-specific epileptic seizure. Most patients with this condition also exhibit delayed development. This study aimed to determine the effect of long-term prenatal stress on susceptibility to infantile spasms.

Methods

We subjected pregnant rats to acute or chronic immobilization stress. Resulting offspring received N-methyl-D-aspartic acid (15 mg/kg, intraperitoneally) on postnatal day 15, and their...

The large-conductance calcium-activated potassium channel holds the key to the conundrum of familial hypokalemic periodic paralysis
June-Bum Kim, Sung-Jo Kim, Sun-Yang Kang, Jin Woong Yi, Seung-Min Kim
Clin Exp Pediatr. 2014;57(10):445-450.   Published online October 31, 2014
Purpose

Familial hypokalemic periodic paralysis (HOKPP) is an autosomal dominant channelopathy characterized by episodic attacks of muscle weakness and hypokalemia. Mutations in the calcium channel gene, CACNA1S, or the sodium channel gene, SCN4A, have been found to be responsible for HOKPP; however, the mechanism that causes hypokalemia remains to be determined. The aim of this study was to improve the understanding...

Review Article
Hypokalemia and hyperkalemia
In-Seok Lim
Clin Exp Pediatr. 2006;49(5):470-474.   Published online May 15, 2006
Hypokalemia and hyperkalemia are the most commonly encountered electrolyte abnormalities in hospitalized patients. Because untreated hypokalemia or hyperkalemia is associated with high morbidity and mortality, it is important to recognize and treat them immediately. Hypokalemia and hyperkalemia can result from disruptions in transcellular homeostasis or in the renal regulation of K＋ excretion. Although the recognition is simple, appropriate management requires...
Original Article
The Role of Aldosterone on the Development of Renal Tubular Reabsorption in Low Birth Weight Infants
Byung Min Choi, Hoe Kyoung Koo, Jin Won Yook, Kyoung Bum Kim, Gi Young Jang, Moon Hee Kim, Kee Hwan Yoo, Young Sook Hong, Joo Won Lee, Soon Kyum Kim
Clin Exp Pediatr. 2001;44(11):1233-1242.   Published online November 15, 2001
Purpose : To determine the postnatal changes in aldosterone action on the renal tubular reabsorption in low birth weight(LBW) infants, we assessed the relation of the aldosterone concentrations to renal parameters during the first 10 days of life. Methods : Twenty LBW infants were evaluated and their gestational ages ranged from 32.4 to 39.3 weeks and their birth weights ranged from...
Identification of a Calcium-activated Potassium Channel Gene Expressed in Rat Cardiac Myocytes
In Seung Park, Hyun-Kyu Jeon, Nam Su Kim, Youn Mo Ahn, Chul-Seung Park, Ha Baik
Clin Exp Pediatr. 2000;43(7):905-912.   Published online July 15, 2000
Purpose : Calcium-activated potassium channels(KCa) may be involved in the transient outward current of the first phase of cardiac action potential. But it is still not clear whether cardiac myocytes express any KCa. We try to identify here the types of KCa expressed in rat caridac myocytes. Methods : We isolated total heart RNA from 50 rats(Spague-Dawley) and performed reverse transcription-polymerase chain reaction(RT-PCR) using specifically...
Effects of Cisapride on Action Potential Duration and on ATP-Sensitive K Channel in Guinea Pig Ventricular Muscles
Chan Uhng Joo, Young Jae Kim, Sung Ki Mun, Soo Wan Chae
Clin Exp Pediatr. 1999;42(7):953-958.   Published online July 15, 1999
Purpose : Cisapride(PrepulsidⓇ) has been recently associated with long QT syndrome. It has been reported to cause Torsades de Pointes and induce early afterdepolarization in rabbit Purkinje fibers. We investigated the electrophysiological effects of cisapride on cardiac action potential duration and ATP-sensitive K channel in papillary muscles. Methods : Cardiac action potentials in guinea pig papillary muscle were recorded with microelectrodes...
Changes in Na and K Concentrations in Human Milk: at different stage of lactation.
Byung Ryong Lee, Jae Sook Ma, Chull Sohn
Clin Exp Pediatr. 1982;25(1):1-7.   Published online January 31, 1982
The concentrations of Sodium and Potassium were measured by flame photometer in the human for milk obtained at clostral(1st 5days postpartum), early transitional (2nd 5days postpartum), late transitional (11th to 29th day postpartum) and mature milk period (1to 15 months postportum) from 92 healthy nursing mothers who delivered at term. The results were summerized as follows: 1) The concentrations of...