Vitoon Prasongwatana

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A survey was conducted of upper urinary tract stone (UUTS) disease in an administrative subdivision of Khon Kaen Province in Thailand. Initial case screening was done by direct contact with the village health volunteers and village health communicators. A positive patient was defined as one who had had surgery for UUTS, previously been diagnosed by(More)
OBJECTIVES To assess the magnesium status and its effect on urinary citrate excretion in patients with renal stones, as they have a low muscular magnesium content. PATIENTS, SUBJECTS AND METHODS Using a magnesium-tolerance test (0.1 mmol/L MgSO4/kg body weight, delivered intravenously), the magnesium status was assessed in 17 patients with renal stones(More)
BACKGROUND Hypocitraturia is a major metabolic abnormality in rural Northeast Thais with renal stones. These people also have low serum and urinary potassium and consume a high carbohydrate and low fat diet, which together might influence the intracellular metabolism and urinary excretion of citrate. METHODS In Study A, we measured plasma and urinary(More)
Skeletal muscles surgically obtained from the stone-former group (external oblique muscle; n = 202, 82 males & 120 females), control group I (external oblique muscle; n = 5, all males), control group II (rectus abdominis muscle; n = 23, all females) and control group III (quadriceps femoris muscle; n = 11, all males) were analyzed for potassium (K), sodium(More)
Oxalate was first coprecipitated at pH 5 as calcium oxalate precipitate (COP) with excess calcium ions and ethanol. Interference in the COP, mainly calcium phosphate, was successfully removed by washing with 0.1 M acetic acid equilibrated with calcium oxalate monohydrate crystal. Since the calcium content of the washed COP showed a high correlation with the(More)
Stones removed from 120 adults and 22 children were analysed for chemical composition. Calcium oxalate was the main component of both adult (49%) and childhood (44%) stones. Calcium stones formed the major type in adults and were slightly more common in males, whereas urate/uric acid stones were predominant in children and were more common in girls. In(More)
Sixteen villages from rural areas of 8 provinces in the northeastern region of Thailand were randomly selected as study sites. Data on potassium (K) contents in 24-hour urine and serum samples of 93 healthy adult volunteer males aged 20-50 years old were completely collected and covered all 3 seasons of the year. The method of direct weighing of food was(More)
OBJECTIVE Report the relationship of composition with age and sex of the patients. MATERIAL AND METHOD A series of 426 urinary stones, 33 from the lower (LUT) and 393 from the upper urinary tract (UUT) of adults, were analyzed for their chemical composition using infrared spectroscopy. The majority of LUT stones were from males (n = 26) and in the age(More)
The effects of potassium and magnesium supplementation on urinary risk factors for renal stone disease were studied in 61 renal stone patients. The subjects were divided into four groups and supplemented for a period of one month with potassium chloride (KCl, Group 1), potassium sodium citrate (K Na citrate, Group 2), magnesium glycine (Mg glycine, Group 3)(More)