Israel Medical Association Journal

Background: Israel is a country with a sunny climate; however, vitamin D deficiency and insufficiency are common findings in certain populations whose exposure to sunlight is limited. Medical residency is known for long indoor working hours, thus theoretically limiting the opportunities for sun exposure.

Objectives: To evaluate whether the vitamin D status among residents in a single medical center in Tel Aviv is below the normal range.

Methods: Forty-six residents (28 females, 18 males, average age 33.9 ± 2.8 years) in three residency programs (internal medicine, general surgery/obstetrics and gynecology, pediatrics) were recruited. Demographic data, personal lifestyle, physical activity details and sun exposure duration were obtained by a questionnaire. Serum levels for 25(OH)D were analyzed by a radioimmunoassay.

Results: The mean serum 25(OH)D concentration was 29.8 ± 5.8 ng/ml. According to Institute of Medicine definitions, none of the residents were vitamin D deficient and only two residents (4%) were vitamin D insufficient (15 ng/ml each). The level of 25(OH)D was similar among the various medical specialties. The 25(OH)D levels correlated with the duration of sun exposure and the number of offspring (regression analysis: R2 = 9.2%, P < 0.04 and R2 = 8.9%, P < 0.04, respectively), but not with nutritional data, blood chemistry, or extent of physical activity. 

Conclusions: Most of the residents maintained normal or near normal 25(OH)D levels, indicating that the residency program itself did not pose a significant risk for vitamin D deficiency. 

 

Background: Human milk produced during prolonged lactation (> 1 year) is extraordinarily rich in fat and has a higher energy content than human milk produced during short lactation.

Objectives: To estimate the fatty acid (FA) profile of human milk and to test the hypothesis that the proportion of C12 and C14 (two dietary saturated FA known to most promote hypercholesterolemia) in human milk during prolonged lactation is similar to that in short lactation.

Methods: We conducted a cross-sectional study of 30 mothers of term infants lactating for more than 1 year as compared with 25 mothers of full-term infants who lactated for 2–6 months. Milk was collected by manual expression in mid-breastfeeding.

Results: The two groups did not differ in maternal height, weight, body mass index, diet, infant birth weight and gestational age, but mothers in the prolonged lactation group were significantly older. There was a significant correlation between lactation duration and C12 or C14. The percentage of all FA combined (except for C12 and C14) decreased significantly over time. In contrast, C12:0 and C14:0 combined increased significantly during lactation (R2 = 10.0%, P < 0.03).

Conclusions: Women who lactated for more than 1 year had higher C12 and C14 FA percentages in their milk than women who lactated for 2–6 months.

Background: The role of continuous renal replacement therapy in patients with acute renal failure is well recognized. CRRT[1] has also become an important modality of treatment in various acute situations without renal failure.

Objectives: To describe our experience with CRRT in acutely ill infants and children without renal failure.

Methods: We analyzed all infants and children who underwent CRRT during the years 1998-2000 in the pediatric intensive care unit and we focus our report on those who were treated for non-renal indications.

Results: Fourteen children underwent 16 sessions of CRRT. The indications for CRRT were non-renal in 7 patients (age range 8 days to 16 years, median = 6.5). Three children were comatose from maple syrup urine disease, three were in intractable circulatory failure secondary to septic shock or systemic inflammatory response, and one had sepsis with persistent lactic acidosis and hypernatremia. Three children underwent continuous hemodiafiltration and four had continuous hemofiltration. The mean length of the procedure was 35 ± 24 hours. All patients responded to treatment within a short period (2–4 hours). No significant complications were observed. Two patients experienced mild hypothermia (34°C), one had transient hypotension and one had an occlusion of the cannula requiring replacement.

Conclusion: Our findings suggest that CRRT is a safe and simple procedure with a potential major therapeutic value for treating acute non-renal diseases in the intensive care setting.