Establishment of reference intervals for free light chains and immunoglobulins in Saudi population.

OBJECTIVES: Testing of serum-free light chains kappa (κ) and lambda (λ), along with ratio (FLCR) is essential for the diagnosis and management of monoclonal gammopathies. Accurate clinical diagnosis depends upon appropriate local population reference intervals (RIs). This study examined the Saudi population for serum-free light chains and other immunoglobulins to establish RIs and to explore variations in the test results by using the International Federation for Clinical Chemistry and Laboratory Medicine's global protocol for harmonized implementation of RI study. METHODS: A total of 180 healthy Saudi adults were recruited. All serum samples were assayed using the Freelite reagents from the Binding Site. The variation in reference values attributable to sex, age, BMI, and region was calculated by ANOVA as a standard deviation ratio (SDR). The RIs for the FLCR were derived by the parametric method and validated by using samples from patients with hypo- and hypergammaglobulinemia. RESULTS: The new RIs for free κ and FLCR were shifted to a higher side from the manufacturer-adapted RIs. Based on the SDR cutoff value (>0.4), between-sex partition RIs were not required for all analytes except IgM. Validation using patients with hypo- or hypergammaglobulinemia and without multiple myeloma, was all within the new RI. BMI, smoking, and exercise were not relevant sources of variation for any analyte. CONCLUSIONS: Locally derived RIs for free light chains and immunoglobulins analytes specific for Saudis were established after careful consideration of various factors. These RIs were more reliable than those provided as guidance by the manufacturer, or from other countries, for appropriate classification and prediction of disease progression for Saudi patients.

Effect of hematocrit, galactose and ascorbic acid on the blood glucose readings of three point-of-care glucometers.

Glucometers are commonly used in a variety of healthcare settings and use in critically ill patients should not be assumed without appropriate tool validation. The study objective was to evaluate the accuracy of three point-of-care glucometers (POCGs) to assess glucose concentration in human blood sample. The POCGs tested included three different instruments and utilized three factors (hematocrit [Hct], galactose and ascorbic acid) in glucose measurements to determine the glucometers' accuracy and compared to the reference laboratory biochemical analyzer (Cobs 8000, Roche, Basal, Switzerland). In this study, the Nova StatStrip glucometer showed no significant variation compared to the laboratory method at high glucose level with various Hct%. ACCU-Chek Inform II overestimated the glucose results at Hct 22% and underestimated at Hct 62%. The Freestyle glucometer showed lower glucose levels compared to the Cobas 8000 at Hct 62%. The ACCU-Check showed significant increase of blood glucose with low Hct% levels when compared to the laboratory method. The Freestyle showed a decreased level of glucose with high Hct 62% interference compared to the Cobas 8000. Galactose interference 100 and 200 mg/dL dramatically affected the accuracy of ACCU-Chek Inform II. Nevertheless, among all three POCGs in this study, the Nova StatStrip showed the most reliable and stable results for glucose level in the presence of interference. Especially, those in critical care units, whereas the Freestyle Precision Pro and ACCU-Chek Inform II were insufficiently accurate for critically ill patients.

Establishment of reference intervals for immunoassay analytes of adult population in Saudi Arabia.

Background This is a second part of report on the IFCC global multicenter study conducted in Saudi Arabia to derive reference intervals (RIs) for 20 immunoassay analytes including five tumor makers, five reproductive, seven other hormones and three vitamins. Methods A total of 826 apparently healthy individuals aged ≥18 years were recruited in three clinical laboratories located in western, central and eastern Saudi Arabia using the protocol specified for the global study. All serum specimens were measured using Abbott, Architect analyzers. Multiple regression analysis (MRA) was performed to explore sources of variation of each analyte: age, body mass index (BMI), physical exercise and smoking. The magnitude of variation of reference values (RVs) attributable to sex, age and region was calculated by ANOVA as a standard deviation ratio (SDR). RIs were derived by the parametric (P) method. Results MRA revealed that region, smoking and exercise were not relevant sources of variation for any analyte. Based on SDR and actual between-sex differences in upper limits (ULs), we chose to partition RIs by sex for all analytes except for α-fetoprotein and parathyroid hormone (PTH). Age-specific RIs were required in females for ferritin, estradiol, progesterone, testosterone, follitropin, luteotropin and prolactin (PRL). With prominent BMI-related increase, RIs for insulin and C-peptide were derived after excluding individuals with BMI > 32 kg/m2. Individuals taking vitamin D supplements were excluded in deriving RIs for vitamin D and PTH. Conclusions RIs of major immunoassay analytes specific for Saudi Arabians were established in careful consideration of various biological sources of variation.

Can Fasting Blood Sugar be Used as an Indicator of Long-Term Diabetic Control Instead of Estimated Average Glucose?

BACKGROUND: Diabetes mellitus is a chronic illness that is a worldwide issue. HbA1c has been used to monitor glycemic control in patients with diabetes for many years. Although HbA1c measurement is needed for calculating estimated average blood glucose (eAG), it is now recommended that eAG is used instead of HbA1c for expression of blood glucose control and communication with patients and health care providers. This study, investigated fasting blood glucose (FBS) as an indicator of overall chronic blood sugar control by assessing the correlation between FBS with eAG derived from HbA1c. METHODS: The blood samples for HbA1c assay were collected in EDTA tubes and were analyzed by an HPLC analyzer (G8 Tosoh, Japan). Blood samples for FBS were collected in serum separator tubes, transported, and centrifuged for 15 minutes at 3,000 g. FBS levels were determined in serum samples with the enzymatic hexokinase method by a clinical chemistry analyzer (Architect 8000, Abbott, USA). RESULTS: Statistical analysis was performed on 1,740 patients with type 2 diabetes mellitus with HbA1c levels above 6.5 mmol/L. The difference between FBS (9.3 ± 3.7 mmol/L) and eAG (11.14 ± 2.7 mmol/L) was statistically signif-icant (p < 0.0001). The correlation coefficient between FBS and eAG was r = 0.65 (95% CI; 0.62 - 0.69), with a p-value < 0.0001. While the correlation coefficient between FBS and eAG at HbA1c < 6.5% was r = 0.251 (95% CI, 0.16 - 0.34), with a significant p-value of < 0.00001. The combined data, standard deviation (SD), median, and interquartile range of eAG and FBS for all of the diabetic groups (n = 2,315), were 10.1 ± 3.00 mmol/L, 9.5 mmol/L, and 7.75 - 12.03 mmol/L for eAG, respectively. Similarly, these values were 8.5 ± 3.6 mmol/L, 7.5 mmol/L, and 6.0 - 10.00 mmol/L for FBS, respectively. CONCLUSIONS: We concluded that there is a moderate and significant positive correlation between fasting blood sugar and the estimated average blood glucose derived from HbA1c. Although FBS might be helpful for daily monitoring of diabetes. Further studies must be conducted to provide solid results to support that FBS and its derived variable eAG can replace HbA1c as an indicator of long-term overall control of T2DM patients.

Correlations between Direct and Calculated Low-Density Lipoprotein Cholesterol Measurements in Children and Adolescents.

BACKGROUND: Low-density lipoprotein cholesterol (LDL-C), as a modifiable risk factor for atherosclerotic cardiovascular disease, should be assessed and monitored. This study compared directly measured and Friedewald-estimated LDL-C values in children and adolescents. METHODS: Blood samples were collected from 464 children and adolescents. Calculated LDL-C (CLDL-C) levels were estimated using the Friedewald formula for any triglyceride value below 4.6 mmol/L. Direct LDL-C (DLDL-C) levels were measured on an ARCHITECT c8000 Abbott Clinical Chemistry Analyzer. The differences in LDL-C were then calculated. RESULTS: The correlation coefficients (R) between DLDL-C and CLDL-C were 0.978 (P = .148) and R = 0.970 (P = .052) for children and adolescents, respectively. Children with LDL-C values above 4.92 mmol/L had a correlation value of 0.971 (P = .419). The correlation and agreement between DLDL-C and CLDL-C in adolescents were moderate for LDL-C below 2.85 mmol/L (R = 0.806; 84.1%) and improved above 2.85 mmol/L (R = 0.978; 91.5%). In children, good correlations between DLDL-C and CLDL-C were observed for normal (<0.85 mmol/L), borderline (0.85-1.12 mmol/L), and abnormal (≥1.13 mmol/L) triglyceride levels (R = 0.9782, 0.990, and 0.951, respectively). The rates of agreement were better for normal (80.5%) and borderline (82.9%) but not abnormal (68.2%) triglyceride levels. CONCLUSION: We observed good agreement between DLDL-C and CLDL-C in both children and adolescents. The Friedewald formula provided an adequate estimate of LDL-C for most fasting specimens. LDL-C difference percentage can also be used as a quality indicator to check laboratory analyzer performance in healthy subjects.

Establishment of reference intervals of clinical chemistry analytes for the adult population in Saudi Arabia: a study conducted as a part of the IFCC global study on reference values.

BACKGROUND: This study is a part of the IFCC-global study to derive reference intervals (RIs) for 28 chemistry analytes in Saudis. METHOD: Healthy individuals (n=826) aged ≥18 years were recruited using the global study protocol. All specimens were measured using an Architect analyzer. RIs were derived by both parametric and non-parametric methods for comparative purpose. The need for secondary exclusion of reference values based on latent abnormal values exclusion (LAVE) method was examined. The magnitude of variation attributable to gender, ages and regions was calculated by the standard deviation ratio (SDR). Sources of variations: age, BMI, physical exercise and smoking levels were investigated by using the multiple regression analysis. RESULTS: SDRs for gender, age and regional differences were significant for 14, 8 and 2 analytes, respectively. BMI-related changes in test results were noted conspicuously for CRP. For some metabolic related parameters the ranges of RIs by non-parametric method were wider than by the parametric method and RIs derived using the LAVE method were significantly different than those without it. RIs were derived with and without gender partition (BMI, drugs and supplements were considered). CONCLUSIONS: RIs applicable to Saudis were established for the majority of chemistry analytes, whereas gender, regional and age RI partitioning was required for some analytes. The elevated upper limits of metabolic analytes reflects the existence of high prevalence of metabolic syndrome in Saudi population.

Neglected Bilateral Posterior Shoulder Fracture Dislocation in an Uncontrolled Seizure patient.

Posterior dislocation of the shoulder is a rare injury that occurs secondary to trauma and seizures. Diagnosis is often missed and treatment is challenging. Neglected posterior dislocation is associated with Hill-Sachs lesion which leads to locking of dislocation. Correct diagnosis is achieved by history taking, a physical examination and appropriate imaging. In neglected shoulder dislocation with uncontrolled seizure and humeral head defects of up to 45% the McLaughlin procedure shows excellent results at follow-up.

Serum procalcitonin in cirrhotic patients with septic shock: relationship with adrenal insufficiency and clinical outcomes.

BACKGROUND: Serum procalcitonin is commonly used to differentiate systemic inflammation due to infection from non-infectious causes. Limited data exist on the value of procalcitonin in predicting relative adrenal insufficiency (RAI). This study evaluated the value of procalcitonin in predicting RAI and mortality in cirrhotic patients with septic shock. METHODS: This was a post-hoc analysis of a randomized placebo-controlled trial that evaluated low-dose hydrocortisone in cirrhotic patients with septic shock. Extracted first study-day data included serum procalcitonin, baseline serum cortisol, cortisol level after 250 microg - adrenocorticotropic hormone stimulation test and 28 - day mortality. RAI was defined as a baseline serum cortisol < 10 microg/dL or cortisol not rising by > 9 microg/dL after stimulation. Procalcitonin > 0.5 ng/mL was considered high. RESULTS: Forty-five patients had serum procalcitonin measured (mean = 2.7 +/- 3.2 ng/mL, first and third quartiles were 0.3 and 3.3 ng/mL, respectively). Most (78%) patients had high procalcitonin levels. RAI was present in 34 (76%) patients. Patients with high procalcitonin were more likely to have RAI (odds ratio, 4.8; 95% confidence interval, 1.1 - 22.1). Receiver operator characteristic curve analysis showed that the best cut-off for detecting RAI was 1.0 ng/mL (sensitivity = 79% and specificity = 55%). High serum procalcitonin was not associated with 28 -day mortality (80% for normal procalcitonin and 77% for high procalcitonin, p = 0.61). CONCLUSIONS: High serum procalcitonin was highly associated with RAI in cirrhotic patients with septic shock. Procalcitonin was not associated with 28 - day mortality in this patient population.

Vitamin D status among patients visiting a tertiary care center in Riyadh, Saudi Arabia: a retrospective review of 3475 cases.

BACKGROUND: Vitamin D deficiency has been implicated in several chronic, non-communicable diseases independent of its conventional role in bone and calcium homeostasis. In this retrospective study, we determined the prevalence of vitamin D deficiency and its association to several cardiometabolic indices among patients visiting King Abdulaziz Medical City (KAMC), a tertiary hospital in Riyadh, Saudi Arabia. METHODS: A total of 3475 charts of out-patient subjects who visited KAMC from September 2009 until December 2010 were reviewed and included. Variables of interest included measurements of vitamin D status, glycemic and renal profile, as well as trace elements (calcium and phosphorous). RESULTS: The over-all prevalence of vitamin D deficiency in the cohort studied was 78.1% in females and 72.4% in males. 25(OH) vitamin D was significantly associated with increasing age and weight (p-values < 0.0001 and 0.005, respectively). It was also positively associated with albumin, calcium and phosphorous (p-values < 0.0001, < 0.0001 and 0.0007, respectively) and negatively associated with alkaline phosphatase as well as circulating levels of PTH (p-values 0.0002 and 0.0007, respectively). CONCLUSION: In conclusion, vitamin D deficiency is overwhelmingly common among patients seen at KAMC regardless of the medical condition, and it is significantly associated with increasing age, weight and markers of calcium homeostasis. Findings of the present study further stress the spotlight on vitamin D deficiency epidemic in the country and region in general.

Novel point mutations and mutational complexes in the enhancer II, core promoter and precore regions of hepatitis B virus genotype D1 associated with hepatocellular carcinoma in Saudi Arabia.

In this study, a cohort of 182 patients [55 hepatocellular carcinoma (HCC) and 127 non-HCC] infected with hepatitis B virus (HBV) in Saudi Arabia was investigated to study the relationship between sequence variation in the enhancer II (EnhII), basal core promoter (BCP) and precore regions of HBV genotype D (HBV/D) and the risk of HCC. HBV genotypes were determined by sequencing analysis and/or enzyme-linked immunosorbent assay. Variations in the EnhII, BCP and precore regions were compared between 107 non-HCC and 45 HCC patients infected with HBV/D, followed by age-matched analysis of 40 cases versus equal number of controls. Age and male gender were significantly associated with HCC (p = 0.0001 and p = 0.03, respectively). Serological markers such as aspartate aminotransferase, albumin and anti-HBe were significantly associated with HCC (p = 0.0001 for all), whereas HBeAg positivity was associated with non-HCC (p = 0.0001). The most prevalent HBV genotype was HBV/D (94%), followed by HBV/E (4%), HBV/A (1.6%) and HBV/C (0.5%). For HBV/D1, genomic mutations associated with HCC were T1673/G1679, G1727, C1741, C1761, A1757/T1764/G1766, T1773, T1773/G1775 and C1909. Age- and gender-adjusted stepwise logistic regression analysis indicated that mutations G1727 [odds ratio (OR) = 18.3; 95% confidence interval (CI) = 2.8-118.4; p = 0.002], A1757/T1764/G1766 (OR = 4.7; 95% CI = 1.3-17.2; p = 0.01) and T1773 (OR = 14.06; 95% CI = 2.3-84.8; p = 0.004) are independent predictors of HCC development. These results implicate novel individual and combination patterns of mutations in the X/precore region of HBV/D1 as predictors of HCC. Risk stratification based on these mutation complexes would be useful in determining high-risk patients and improving diagnostic and treatment strategies for HBV/D1.

Pubertal characteristics among schoolgirls in Riyadh, Saudi Arabia.

Puberty is the gradual transition period between childhood and adulthood. Many factors may contribute to the onset of puberty. The objective of the study was to determine the age of onset of secondary pubertal characteristics among Saudi Arabian girls. A cross-sectional study was conducted using a cluster sample design. Seven hundred and twenty-five schoolgirls between the ages of 6 and 16 years from diverse socioeconomic levels were included. During physical examinations, the height and weight of the girls were recorded, and the stages of breast and pubic hair development were determined according to Tanner stages; axillary hair development was determined according to modified stages. The median age at Tanner stage 2 for breast and pubic hair development was 10 years. The median age at stage 2 in modified scales for axillary hair development was 12 years. In conclusion, the median age of the onset of breast development at Tanner stage 2 for Saudi girls in Riyadh is lower than what has been reported in some countries in Europe, South Africa, Turkey and India but similar to girls in Hong Kong, China and white girls in the USA, which may support secular trends of an earlier onset of puberty.

Year-round vitamin D deficiency among Saudi female out-patients.

OBJECTIVE: The aim of the present study was to investigate vitamin D status among female out-patients in Saudi Arabia during the summer and winter seasons. DESIGN: Data were retrospectively collected using medical record abstraction. SETTING: A multidisciplinary hospital in Riyadh between January and December 2009. SUBJECTS: Saudi females (age ≥19 years; n 1556) attending out-patient clinics for various complaints comprised the studied population. The population was subdivided into two groups depending on the date of their visit where blood samples were collected: summer (n 659) and winter groups (n 897). The summer group was further subdivided into premenopausal (age 19-49 years; n 425) and postmenopausal subgroups (age ≥50 years; n 234). Similarly, the winter group was subdivided into premenopausal (n 543) and postmenopausal subgroups (n 354). Serum levels of 25-hydroxyvitamin D (25(OH)D) were measured using HPLC. RESULTS: The prevalence of vitamin D deficiency (25(OH)D <50 nmol/l) was high in both premenopausal and postmenopausal groups (80 % and 68 %, respectively) during the summer, as well as during the winter (85 % and 76 %, respectively). CONCLUSIONS: A high prevalence of vitamin D deficiency among Saudi female out-patients was observed throughout the year despite the routine supplementation with 10-20 µg vitamin D3 for postmenopausal women. Clinicians should seriously consider determining the vitamin D status of Saudi females routinely and prescribing them proper supplementation.

Association of angiotensin converting enzyme gene insertion/deletion polymorphism and familial hypercholesterolemia in the Saudi population.

BACKGROUND: The study of the association between genotype and phenotype is of great importance for the prediction of multiple diseases and pathophysiological conditions. The relationship between angiotensin converting enzyme (ACE) Insertion/Deletion (I/D) polymorphism and Familial Hypercholesterolemia (FH) has been not fully investigated in all the ethnicities. In this study we sought to determine the frequency of I/D polymorphism genotypes of ACE gene in Saudi patients with FH. RESULTS: This is a case-control study carried out purely in Saudi population. Genomic DNA was isolated from 128 subjects who have participated in this study. ACE gene I/D polymorphism was analyzed by polymerase chain reaction in 64 FH cases and 64 healthy controls. There was no statistically significant difference between the groups with respect to genotype distribution. Furthermore, we did not find any significant difference in the frequency of ACE I/D polymorphism in FH subjects when stratified by gender (p = 0.43). CONCLUSION: Our data suggest that ACE gene I/D polymorphism examined in this study has no role in predicting the occurrence and diagnosis of FH.

The impact of introducing automated eGFR reporting on uncovering new cases of chronic kidney disease in a University Hospital in Saudi Arabia.

OBJECTIVE: To determine the impact of introducing eGFR automated reporting on uncovering new cases of Chronic Kidney Disease. METHODS: All serum creatinine (SCr) in adult patients attending outpatient clinics over a two-month period were recorded and eGFR estimated. Cases with a SCr within normal limits but were in CKD stage 3 (<60 mL/min) or higher were recorded and their numbers, percentages and mean ages calculated. Stages 1 and 2 were excluded from analysis because urinary albumin and other urinary abnormalities were not checked. RESULTS: A total of 26,422 SCr from different patients were included. The mean SCr was 92.5 ± 130.9 µmol/ and the mean eGFR was 99.8 ± 32.4 mL/min/1.73 m(2). Of all the10,601 males with normal SCr, 0.84% were in CKD stage 3 and in all the 14,695 female, 19.24% were in stage 2 in stage. Of all the 14,695 females with serum creatinine in the normal range, 200 (1.36%) were in CKD stage 3. The patients in stages 2 and 3 were significantly older. CONCLUSION: If our findings are shown to be true for the rest of Saudi Arabia, one could extrapolate that for each 100,000 serum creatinine assayed for males, 840 new cases will be uncovered in CKD stage 3. The corresponding number for females would be 1360 cases.

Establishment of reference intervals for hematological parameters of adult population in the western region of Saudi Arabia.

BACKGROUND: Most of hematology laboratories in Saudi Arabia utilize the reference intervals (RIs) provided by instrument manufacturers. This study aimed to define RIs of hematological parameters for adult population in the western region of Saudi Arabia and to explore their specific features from an international perspective. METHOD: This study was conducted according to the harmonized protocol of IFCC Committee on RIs and Decision Limits. Blood samples collected from 409 healthy Saudi males and females adults were analyzed for complete blood count (CBC) by using Cell-Dyn Sapphire analyzer and for iron profile by using Architect analyzers. The needs for RIs partitioned by sex and age was based on standard deviation ratio (SDR) and/or bias ratio (BR). RIs were derived parametrically with/without application of the latent abnormal values exclusion method (LAVE). RESULTS: Based on thresholds of SDR≥0.4 and/or BR≥0.57, RIs were partitioned by sex for red-blood cell count, hemoglobin, hematocrit, red cell distribution width, erythrocyte sedimentation rate, iron, transferrin, ferritin, eosinophil, platelet, plateletcrit, etc. Partitioning by age was not necessary for any of the analytes. LAVE procedure caused appreciable changes in RI limits for most erythrocyte and iron parameters but not for leukocyte parameters. Comparable to other non-IFCC studies on CBC RIs, the RBC and hematocrit (Ht) ranges have shifted to a higher side in both genders. After applying the LAVE method, the male and female RIs for Hb were 4.56 to 6.22 ×106/µL and 3.94 to 5.25 ×106/µL respectively while RIs for Ht were 40.2 to 52.0% and 33.6 to 44.5% respectively. CONCLUSION: LAVE method contributed to reducing the influence of latent anemia in deriving RIs for erythrocyte related parameters. Using the up-to-date methods, the RIs of CBC determined specifically for Saudis will help to improve the interpretation of test results in medical decision making.

Cellular and molecular responses of Saudi chronic myeloid leukaemia patients to imatinib (STI-571): ten year experience.

BACKGROUND: The cyto-genetic hallmark of chronic myeloid leukaemia (CML), the Philadelphia chromosome (Ph), is the first consistent chromosomal abnormality that has been associated to a certain cancer type. In CML, Philadelphia chromosome is present leading to resistance to cell death and rapid proliferation. The aim of this study is to evaluate the different responses, toxicity and survival of Saudi CML patients to imatinib mesylate. METHODS: All newly diagnosed CML patients who were treated with imatinib were included in this study. We investigated haematological, and molecular and cytogenetic responses by CBC, FISH and RT-PCR respectively. Cell proliferation and apoptosis were assayed using AUC and TUNEL respectively. RESULTS: Of the 12 cases, 9 (75%) were males and 3 (25%) were female. Four (33%) of the cases were diagnosed incidentally and 8 cases (67%) presented mainly with fatigue (75%), fever (58%), and splenomegaly (83%). Signs of bleeding and rashes were rare at presentation. The majority of patients had low risk (8, 67%), and 33% had intermediate risk; but none of them had high risk CML. At the last follow up, 11 (92%) were in remissions. One patient (8%) was in remission after 3 years, 4 (33%) were in remission after 6 years, one was in remission after 7 years and 5 (42%) were in remission after 10 years. Only one patient had incomplete major molecular response (MMR) to imatinib after 12 years. The majority of the patients (10, 83%) were in MMR after 6 years and 42% of them were in MMR after 10 years of therapy. Adverse effects of imatinib were not reported by the patients. Imatinib treatment resulted in the reduction of proliferation and induction of apoptosis of CML CFU-GM cells. CONCLUSION: Imatinib mesylate is capable of treating Philadelphia chromosome-positive CP-CML without any adverse effects.

Age- and Gender-Specific Reference Intervals for Fasting Blood Glucose and Lipid Levels in School Children Measured With Abbott Architect c8000 Chemistry Analyzer.

Reference intervals for pubertal characteristics are influenced by genetic, geographic, dietary and socioeconomic factors. Therefore, the aim of this study was to establish age-specific reference intervals of glucose and lipid levels among local school children. This was cross-sectional study, conducted among Saudi school children. Fasting blood samples were collected from 2149 children, 1138 (53%) boys and 1011 (47%) girls, aged 6 to 18 years old. Samples were analyzed on the Architect c8000 Chemistry System (Abbott Diagnostics, USA) for glucose, cholesterol, triglycerides, HDL and LDL. Reference intervals were established by nonparametric methods between the 2.5th and 97.5th percentiles. Significant differences were observed between boys and girls for cholesterol and triglycerides levels in all age groups (P < 0.02). Only at age 6-7 years and at adolescents, HDL and LDL levels were found to be significant (P < 0.001). No significant differences were seen in glucose levels except at age 12 to 13 years. Saudi children have comparable serum cholesterol levels than their Western counterparts. This may reflect changing dietary habits and increasing affluence in Saudi Arabia. Increased lipid screening is anticipated, and these reference intervals will aid in the early assessment of cardiovascular and diabetes risk in Saudi pediatric populations.

Prevalence and factors associated with dyslipidemia among adolescents in Saudi Arabia.

Dyslipidemia is a major risk factor for atherosclerosis. Screening for dyslipidemia at an early age is essential to prevent and control its consequences. This study aimed to determine prevalence of dyslipidemia and its correlates among adolescents in Saudi Arabia. Data of 5854 adolescents aged 10-19 years from all 13 regions of Saudi Arabia were obtained from the Jeeluna study; a national cross-sectional, multistage stratified cluster sample survey. Dyslipidemia was defined based on the National Heart Lung and Blood Institute and National Cholesterol Education Program guidelines for adolescents. We found that a quarter of Saudi adolescents have dyslipidemia (males: 33.3%, females: 17.9%). Significant variation was observed by region (p < 0.001). Prevalence of abnormal Total Cholesterol was 6.7%, LDL-C 7.1%, HDL-C 12.8%, Non-HDL-C 8.3%, and Triglycerides 9.6%. Factors independently associated with dyslipidemia were male gender (OR = 2.19, 95% CI 1.78-2.70, p < 0.001), BMI (underweight OR = 0.80, 95% CI 0.69-0.94, overweight OR = 1.76, 95% CI 1.50-2.06, obese OR = 2.80, 95% CI 2.34-3.34, p < 0.001, vs. normal) and serum ferritin (high OR = 7.02, 95% CI 1.49-34.79, low OR = 0.82, 95% CI 0.67-1.01, p = 0.04 vs. normal) and ≥ 1 daily intake of carbonated beverage (OR = 1.10, 95% CI 1.00-1.20, p = 0.03 vs. no or not daily intake). Public health interventions for improving lipid profile of adolescents are urgently needed.

Timing of Puberty and Late Pubertal Height in Saudi Schoolboys: Riyadh Puberty Study II.

Objective: Puberty has a significant contribution to the final height. Therefore, it is crucial to understand the normal variations in the onset and tempo of puberty in a specific population. In this study, we aimed to provide normative data on the timing of puberty and late pubertal height (LPH) in Saudi schoolboys in Riyadh. Methods: This is a cross-sectional field study (2011-2013) including Saudi schoolboys (grades 1-12; aged 6 to 19 years). Schools were chosen to represent the population from urban and rural areas in the Riyadh region. Pubertal maturity staging for gonads was assessed by measuring testicular size using a Prader orchidometer and assessing the Tanner staging of pubic hair. The marginal mean age was calculated using regression analysis. Results: We recruited 1086 schoolboys. The estimated mean age of pubertal onset at G2 was 11.8 (95% CI 11.60-12.0) years, for gonadal development at G3 was 13.2 (95% CI 12.9-13.5), G4 = 15.0 (95% CI 14.7-15.2), and G5 = 16.1 (95% CI 15.9-16.3) years, and for pubic hair stage 2 (PH2) was 12.6 (95% CI 12.4-12.9) years. The estimated time from G2/PH2 to G5/PH5 was 4.3 and 3.9 years, respectively. At the onset of puberty, the mean height was 144.7 cm and it reached 167.8 cm at G5 with a pubertal height gain of 23.1 cm. Conclusion: Our data present the norms of the timing of puberty and LPH in Saudi schoolboys. Saudi adolescent males are shorter than some European and American comparatives mainly due to shortness during childhood. However, they could have shorter LPH than Turkish, Greek, Thai, and Japanese due to a less pubertal height gain.

Etomidate and mortality in cirrhotic patients with septic shock.

BACKGROUND: Clinical effects and outcomes of a single dose etomidate prior to intubation in the intensive care setting is controversial. The aim of this study is to evaluate the association of a single dose effect of etomidate prior to intubation on the mortality of septic cirrhotic patients and the impact of the subsequent use of low dose hydrocortisone. METHODS: This is a nested-cohort study within a randomized double blind placebo controlled study evaluating the use of low dose hydrocortisone in cirrhotic septic patients. Cirrhotic septic patients ≥ 18 years were included in the study. Patients who received etomidate prior to intubation were compared to those who did not receive etomidate for all cause 28-day mortality as a primary outcome. RESULTS: Sixty two intubated patients out of the 75 patients randomized in the initial trial were eligible for this study. Twenty three of the 62 intubated patients received etomidate dose prior to intubation. Etomidate use was not associated with all cause 28-day mortality or hospital mortality but was associated with significantly higher ICU mortality (91% vs. 64% for etomidate and controls groups, respectively; p = 0.02). Etomidate patients who received subsequent doses of hydrocortisone required lower doses of vasopressors and had more vasopressor-free days but no improvement in mortality. CONCLUSIONS: In this group of septic cirrhotic patients with very high mortality, etomidate increased ICU mortality. Subsequent use of hydrocortisone appears to have no benefit beyond decreasing vasopressor requirements. The lowest mortality was observed in patients who did not receive etomidate but received hydrocortisone.