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Journals
Year of Publication
1.  The role of asthma guidelines in achieving current control and reducing future risk 
Annals of Thoracic Medicine  2012;7(4):173-174.
doi:10.4103/1817-1737.102143
PMCID: PMC3506097  PMID: 23189094
2.  Authors’ reply 
Annals of Thoracic Medicine  2012;7(3):171-172.
PMCID: PMC3425055  PMID: 22924081
3.  Budesonide and fluticasone and adrenal suppression 
doi:10.4103/1817-1737.102188
PMCID: PMC3506108  PMID: 23189105
4.  High resolution computed tomography in cotton-induced lung disease 
Annals of Thoracic Medicine  2012;7(4):253-254.
doi:10.4103/1817-1737.102189
PMCID: PMC3506109  PMID: 23189106
5.  Sleep medicine: Present and future 
Annals of Thoracic Medicine  2012;7(3):113-114.
doi:10.4103/1817-1737.98841
PMCID: PMC3425040  PMID: 22924066
6.  Serum hepcidin and chronic obstructive pulmonary disease 
doi:10.4103/1817-1737.98855
PMCID: PMC3425054  PMID: 22924080
7.  The Saudi initiative for asthma – 2012 update: Guidelines for the diagnosis and management of asthma in adults and children 
Annals of Thoracic Medicine  2012;7(4):175-204.
This an updated guidelines for the diagnosis and management of asthma, developed by the Saudi Initiative for Asthma (SINA) group, a subsidiary of the Saudi Thoracic Society. The main objective of SINA is to have updated guidelines, which are simple to understand and easy to use by non-asthma specialists, including primary care and general practice physicians. This new version includes updates of acute and chronic asthma management, with more emphasis on the use of Asthma Control Test in the management of asthma, and a new section on “difficult-to-treat asthma.” Further, the section on asthma in children was re-written to cover different aspects in this age group. The SINA panel is a group of Saudi experts with well-respected academic backgrounds and experience in the field of asthma. The guidelines are formatted based on the available evidence, local literature, and the current situation in Saudi Arabia. There was an emphasis on patient–doctor partnership in the management that also includes a self-management plan. The approach adopted by the SINA group is mainly based on disease control as it is the ultimate goal of treatment.
doi:10.4103/1817-1737.102166
PMCID: PMC3506098  PMID: 23189095
Asthma; asthma control test; guidelines; Saudi Arabia
8.  Effects of the pneumoperitoneum and Trendelenburg position on respiratory mechanics in the rats by the end-inflation occlusion method 
Annals of Thoracic Medicine  2012;7(4):205-209.
PURPOSE:
To describe the consequences of the cranial displacement of the diaphgram occurring during pneumoperitoneum (Pnp) and/or Trendelenburg (Tnd) position on respiratory mechanics. Possible addictive effects and the changes of the viscoelastic respiratory system resistance were studied, which were not extensively described before.
METHODS:
The end-inflation occlusion method was applied on eight rats. It allows us to determine mechanical parameters such as respiratory system static elastance, the ohmic resistance due to frictional forces in the airways, and the additional viscoelastic impedance due to tissues deformation. Measurements during mechanical ventilation were taken in controls (supine position), after 20–25° head-down tilting (Tnd), after abdominal air insufflation up to 12 mmHg abdominal pressure in the supine position (Pnp), and combining Tnd + Pnp. Tnd and Pnp modalities were similar to those commonly applied during surgical procedures in humans.
RESULTS:
We confirmed the previously described detrimental effects on respiratory mechanics due to the diaphgram displacement during both Pnp and Tnd. The increment in the total resistive pressure dissipation was found to depend primarily on the effects on the viscoelastic characteristics of the respiratory system. Data suggesting greater effects of Pnp compared to those of Tnd were obtained.
CONCLUSION:
The cranial displacement of the diaphgram occurring as a consequence of Pnp and/or Tnd, for example during laparoscopic surgical procedures, causes an increment of respiratory system elastance and viscoelastic resistance. The analysis of addictive effects show that these are more likely to occur when Pnp + Tnd are compared to isolated Tnd rather than to isolated Pnp.
doi:10.4103/1817-1737.102168
PMCID: PMC3506099  PMID: 23189096
Pneumoperitoneum; rat; respiratory mechanics; trendelenburg position
9.  The utility of endobronchial ultrasound-guided transbronchial needle aspiration in mediastinal or hilar lymph node evaluation in extrathoracic malignancy: Benign or malignant? 
Annals of Thoracic Medicine  2012;7(4):210-214.
OBJECTIVE:
Newly arising enlarged or hypermetabolic mediastinal/hilar lymph nodes (LNs) in patients with previously diagnosed extrathoracic malignancies raise suspicion of metastasis. Relatively high proportion of these LNs is due to a benign condition. We aimed to determine frequency of malignant LNs and role of endobronchial ultrasound-guided transbronchial needle aspiration (EBUS-TBNA) for clarification of the origin of suspicious LNs in these patients.
METHODS:
Consecutive patients with a known extrathoracic malignancy and suspected hilar/mediastinal LN were included in this prospective study. Computed tomography (CT) of thorax and positron emission tomography-CT of all patients were taken. LNs with short axis >1 cm at CT of thorax and SUV ≥ 2.5 were accepted suspicious for malignancy. All patients underwent EBUS-TBNA for pathological verification of LNs. Patients with benign diagnosis either underwent invasive procedures or were followed up. The results were evaluated for frequency of malignant hilar/mediastinal LNs and sensitivity, specificity, and diagnostic values of EBUS-TBNA.
RESULTS:
A total of 48 cases with a mean age of 57.4±11.6 were included. All cases had the diagnosis of an extrathoracic malignancy. 78 LNs were aspirated with EBUS-TBNA in 48 cases (1.62 LNs/patient). The mean short axis of aspirated LNs was 1.51±0.63. Results of EBUS-TBNA revealed malignancy in 15 cases (31.2%), tuberculosis in six cases (12.5%), sarcoidosis in four cases (8.3%), and reactive adenitis in 23 cases (48%). The sensitivity, specificity, and negative predictive value of EBUS-TBNA for malignancy were 83.3%, 100%, and 90.9%, respectively. When both benign and malignant diseases were considered, sensitivity, specificity, negative predictive value, and diagnostic accuracy of EBUS-TBNA were 89.2%, 100%, 86.9%, and 93.7%, respectively.
CONCLUSIONS:
The ratio of benign LNs in patients with extrathoracic malignancies is relatively high. EBUS-TBNA is a safe, minimally invasive, and effective method for clarification of intrathoracic LNs.
doi:10.4103/1817-1737.102171
PMCID: PMC3506100  PMID: 23189097
Endobronchial ultrasound; extrathoracic malignancy; fine needle aspiration; lymph nodes; mediastinal diseases
10.  Role of therapeutic thoracentesis in tuberculous pleural effusion 
Annals of Thoracic Medicine  2012;7(4):215-219.
CONTEXT:
Prevalence of tuberculous pleural effusion is very high in the Asian subcontinent but very few studies have come up from this part of the world about the course of recovery of pulmonary functions after institution of anti-tubercular therapy (ATT) and thoracentesis.
AIMS:
To study initial lung function impairment, changes over time after institution of ATT and thoracentesis and residual abnormalities left at the end of six months of treatment.
SETTINGS AND DESIGN:
Randomized open level interventional study over two years in 52 patients at a tertiary level teaching hospital.
METHODS:
The study population was divided into two equal groups, A (therapeutic thoracentesis) and B (diagnostic thoracentesis). Spirometry, chest radiograph and ultrasonography of thorax were done initially and at each follow-up visit up to six months. Statistical analysis was done (P value < 0.05 considered significant).
RESULTS:
Both groups were comparable initially. After six months none in group A and five patients in group B had minimal pleural effusion. During follow up, mean percentage predicted of FEV1 and FVC increased more in A than in B and the differences were statistically significant (P < 0.05). Pleural thickening, initially absent in both groups, was found to be more in B as compared to A at subsequent follow-up visits and this was statistically significant (P < 0.05).
CONCLUSIONS:
Thoracentesis should be considered in addition to anti-TB treatment, especially in large effusions, in order to relieve dyspnea, avoid possibility of residual pleural thickening and risk of developing restrictive functional impairment.
doi:10.4103/1817-1737.102176
PMCID: PMC3506101  PMID: 23189098
Lung function; residual pleural thickening; thoracentesis; tuberculous pleural effusion
11.  Diagnostic value of ex vivo pleural fluid interferon-gamma versus adapted whole-blood quantiferon-TB gold in tube assays in tuberculous pleural effusion 
Annals of Thoracic Medicine  2012;7(4):220-225.
BACKGROUND:
Noninvasive diagnosis of pleural tuberculosis (TB) remains a challenge due to the paucibacillary nature of the disease. As Mycobacterium tuberculosis (MTB)-specific T cells are recruited into pleural space in TB effusion; their indirect detection may provide useful clinical information.
OBJECTIVES:
Evaluation of pleural fluid interferon (INF)-γ levels vs Quantiferon–TB Gold In tube assay (QFT- IT) in blood and its adapted variants, using pleural fluid or isolated pleural fluid cells in the diagnosis of pleural TB.
METHODS:
Thirty-eight patients with pleural effusion of unknown etiology presented at Assiut University Hospital, Egypt, were recruited. Blood and pleural fluid were collected at presentation for INF-γ assays. Ex vivo pleural fluid INF-γ levels, QFT-IT in blood and its adapted variants were compared with final diagnosis as confirmed by other tools including blind and/or thoracoscopic pleural biopsy.
RESULTS:
The final clinical diagnosis was TB in 20 (53%), malignancy in 10 (26%), and effusion due to other causes in eight patients (21%). Ex vivo pleural fluid INF-γ levels accurately identified TB in all patients and were superior to the QFT-IT assays using blood or pleural fluid (70 and 78% sensitivity, with 60 and 83% specificity, respectively). QFT-IT assay applied to isolated pleural fluid cells had 100% sensitivity and 72% specificity. The optimal cut-off obtained with ROC analysis was 0.73 for TB Gold assay in blood assay, 0.82 IU/ml for the cultured pleural fluid assay, and 0.94 for isolated pleural cells assay.
CONCLUSION:
The ex vivo pleural fluid INF-γ level is an accurate marker for the diagnosis of pleural TB. QFT- IT assay in peripheral blood or its adapted versions of the assay using pleural fluid and/or washed pleural fluid cells had no diagnostic advantage over pleural fluid INF-γ in the diagnosis of pleural TB.
doi:10.4103/1817-1737.102181
PMCID: PMC3506102  PMID: 23189099
Diagnosis; interferon-γ; interferon-γ release assays; quantiferon–TB gold in tube assay; tuberculous effusion
12.  Relation of oxidant-antioxidant imbalance with disease progression in patients with asthma 
Annals of Thoracic Medicine  2012;7(4):226-232.
CONTEXT:
Asthma is a chronic airway disorder which is associated to the inflammatory cells. Inflammatory and immune cells generate more reactive oxygen species in patients suffering from asthma which leads to tissue injury.
AIMS:
To investigate the role of oxidant-antioxidant imbalance in disease progression of asthmatic patients.
SETTINGS AND DESIGN:
In this study, 130 asthmatic patients and 70 healthy controls were documented.
METHODS:
For this malondialdehyde level, total protein carbonyls, sulfhydryls, activity of superoxide dismutase (SOD), catalase, glutathione peroxidase (GPx), total blood glutathione, and total antioxidant capacity (FRAP) were measured.
STATISTICAL ANALYSIS USED:
Analysis of the data was done using unpaired student t test and one-way ANOVA analysis. P < 0.05 was considered significant.
RESULTS:
The present work showed that the systemic levels of MDA (4.19 ± 0.10 nmol/ml, P < 0.001) and protein carbonyls (1.13 ± 0.02 nmol/mg, P < 0.001) were found to be remarkably higher in asthmatic patients while protein sulfhydryls (0.55 ± 0.01 mmol/l, P < 0.05) decreased as compared to controls (2.84 ± 0.12 nmol/ml, 0.79 ± 0.02 nmol/mg and 0.60 ± 0.02 mmol/l, respectively). We also observed decrease in activities of SOD (2047 ± 50.34 U/g Hb, P < 0.05), catalase (4374 ± 67.98 U/g Hb, P < 0.01), and GPx (40.97 ± 1.05 U/g Hb, P < 0.01) in erythrocytes compared to control (2217 ± 60.11 U/g Hb, 4746 ± 89.94 U/g Hb, and 48.37 ± 2.47 U/g Hb, respectively). FRAP level (750.90 ± 21.22 μmol/l, P < 0.05) in plasma was decreased, whereas total blood glutathione increased (0.94 ± 0.02 mmol/l, P < 0.05) as seen in control (840.40 ± 28.39 μmol/l and 0.84 ± 0.04 mmol/l).
CONCLUSIONS:
This work supports and describes the hypothesis that an imbalance between oxidant-antioxidant is associated to the oxidative stress which plays a significant role in severity of the disease.
doi:10.4103/1817-1737.102182
PMCID: PMC3506103  PMID: 23189100
Antioxidants; asthma; oxidants; oxidative stress; reactive oxygen species
13.  Patient-related independent clinical risk factors for early complications following Nd: YAG laser resection of lung cancer 
Annals of Thoracic Medicine  2012;7(4):233-237.
INTRODUCTION:
Neodymium:yttrium aluminum garnet (Nd:YAG) laser resection is one of the most established interventional pulmonology techniques for immediate debulking of malignant central airway obstruction (CAO). The major aim of this study was to investigate the complication rate and identify clinical risk factors for complications in patients with advanced lung cancer.
METHODS:
In the period from January 2006 to January 2011, data sufficient for analysis were identified in 464 patients. Nd:YAG laser resection due to malignant CAO was performed in all patients. The procedure was carried out in general anesthesia. Complications after laser resection were defined as severe hypoxemia, global respiratory failure, arrhythmia requiring treatment, hemoptysis, pneumothorax, pneumomediastinum, pulmonary edema, tracheoesophageal fistulae, and death. Risk factors were defined as acute myocardial infarction within 6 months before treatment, hypertension, chronic arrhythmia, chronic obstructive pulmonary disease (COPD), stabilized cardiomyopathy, previous external beam radiotherapy, previous chemotherapy, and previous interventional pulmonology treatment.
RESULTS:
There was 76.1% male and 23.9% female patients in the study, 76.5% were current smokers, 17.2% former smokers, and 6.3% of nonsmokers. The majority of patients had squamous cell lung cancer (70%), small cell lung cancer was identified in 18.3%, adenocarcinoma in 3.4%, and metastases from lung primary in 8.2%. The overall complication rate was 8.4%. Statistically significant risk factors were age (P = 0.001), current smoking status (P = 0.012), arterial hypertension (P < 0.0001), chronic arrhythmia (P = 0.034), COPD (P < 0.0001), and stabilized cardiomyopathy (P < 0.0001). Independent clinical risk factors were age over 60 years (P = 0.026), arterial hypertension (P < 0.0001), and COPD (P < 0.0001).
CONCLUSION:
Closer monitoring of patients with identified risk factors is advisable prior and immediately after laser resection. In order to avoid or minimize complications, special attention should be directed toward patients who are current smokers, over 60 years of age, with arterial hypertension or COPD.
doi:10.4103/1817-1737.102184
PMCID: PMC3506104  PMID: 23189101
Bronchoscopy; interventional pulmonology; laser resection; lung cancer; Nd:YAG laser; treatment
14.  Abrupt withdrawal of inhaled corticosteroids does not result in spirometric deterioration in chronic obstructive pulmonary disease: Effect of phenotyping? 
Annals of Thoracic Medicine  2012;7(4):238-242.
BACKGROUND AND OBJECTIVE:
Some studies show a decline of FEV1 only one month after withdrawal of inhaled corticosteroids (ICS), while others show no decline. We speculate that the presence of an asthma phenotype in the Chronic Obstructive Pulmonary Disease (COPD) population, and that its exclusion may result in no spirometric deterioration.
METHODS:
We performed a prospective clinical observation study on 32 patients who fulfilled the Global Initiative for Chronic Obstructive lung disease definition of COPD (Grade II-IV). They were divided into two phenotypic groups. 1. Irreversible asthma (A and B) (n = 13): A. Asthma: Bronchial biopsy shows diffuse thickening of basement membrane (≥ 6.6 μm). B. Airflow limitation (AFL) likely to be asthma: KCO > 80% predicted if the patient refused biopsy. 2. COPD (A and B) (n = 19): A. COPD: hypercapneic respiratory failure with raised bicarbonate, panlobular emphysema with multiple bullas, or bronchial biopsy showing squamous metaplasia and epithelial/subepithelial inflammation without thickening of the basement membrane. B. AFL likely to be COPD: KCO < 80% predicted.
RESULTS:
The asthma phenotype was significantly younger, had a strong association with hypertrophy of nasal turbinates, and registered a significant improvement of FEV1 (350 ml) vs a decline of - 26.5 ml in the COPD phenotype following therapy with budesonide/formoterol for one year. Withdrawal of budesonide for 4 weeks in the COPD phenotype resulted in FEV1 + 1.33% (SD ± 5.71) and FVC + 1.24% (SD ± 5.32); a change of <12% in all patients.
CONCLUSIONS:
We recorded no spirometric deterioration after exclusion of the asthma phenotype from a COPD group.
doi:10.4103/1817-1737.102185
PMCID: PMC3506105  PMID: 23189102
Asthma; COPD; radiology and other imaging; respiratory function tests
15.  Clinical characteristics of amyloidosis with isolated respiratory system involvement: A review of 13 cases 
Annals of Thoracic Medicine  2012;7(4):243-249.
BACKGROUND:
Isolated pulmonary amyloidosis is a very rare disease.
METHODS:
We retrospectively reviewed the records of patients with pathologically proven isolated pulmonary amyloidosis treated at our hospital from 1990 to 2011.
RESULTS:
There were 9 males and 4 females with a mean age of 54.7 years (range, 45–72 years) and the mean course of disease was 46.5 months (range, 5 months–15 years). The most common symptoms were cough (10/13), expectoration (8/13), hemoptysis (4/13), chest tightness (12/13), dyspnea (10/13), chest pain (3/13), fever (5/13), and body weight loss (2/13). Radiological findings included tracheal stenosis (2/13), bronchial stenosis with atelectasis (5/13), pulmonary nodules (3/13), lung consolidation (1/13), and lymph node enlargement with pleural effusion (2/13). Treatments included endotracheal stenting, endoscopic resection of tracheal and bronchial lesions, lung resection, and drug therapy with glucocorticoids, antineoplastic agents, or antibiotics. Four patients died of the disease within 1 year of diagnosis, 2 died of pneumonia at 3–4 years after original treatment, and the remaining patients are alive with follow-up ranging from 3 to 15 years.
CONCLUSIONS:
Isolated pulmonary amyloidosis is a rare disease with a relatively high mortality and its various manifestations make diagnosis challenging. Surgical resection of lesions and chemotherapy tend to be effective treatments.
doi:10.4103/1817-1737.102186
PMCID: PMC3506106  PMID: 23189103
Amyloidosis; colchicines; mediastinum; melphalan; isolated pulmonary amyloidosis; respiratory system
16.  Bilateral congenital lobar emphysema: A rare cause for respiratory distress in infancy 
Annals of Thoracic Medicine  2012;7(4):250-252.
We report a rare case of bilateral congenital lobar emphysema in a 2-month-old male infant who presented with severe respiratory distress leading to respiratory failure. Plain chest X-ray and later high-resolution CT scan of the chest revealed that both the right middle and the left upper lobes were emphysematous. Surgical excision of the affected lobes has been done successfully in two sequential operations of right middle lobectomy followed by left upper lobectomy which resulted in significant improvement of respiratory status. In this report, the presentation, diagnosis, and surgical management of this rare condition are discussed.
doi:10.4103/1817-1737.102187
PMCID: PMC3506107  PMID: 23189104
Congenital lobar emphysema; Infant; lobectomy; respiratory distress
17.  Role of ATP binding and hydrolysis in the gating of the cystic fibrosis transmembrane conductance regulator 
Annals of Thoracic Medicine  2012;7(3):115-121.
The CFTR gene is unique within the ATP-binding cassette (ABC) protein family, predominantly of transporters, by coding a chloride channel. The gating mechanism of ABC proteins has been characterized by the ATP Switch model in terms cycles of dimer formation and dissociation linked to ATP binding and hydrolysis, respectively. It would be of interest to assess the extent that Cystic Fibrosis Transmembrane Conductance Regulator (CFTR), a functional channel, fits the ATP Switch model for ABC transporters. Additional transporter mechanisms, namely those of Pgp and HlyB, are discussed for perspective. Literature search of databases selected key references in comparing and contrasting the gating mechanism. CFTR is a functional chloride channel facilitating transmembrane anion flow down electrochemical gradients. A dysfunctional CFTR protein results in cystic fibrosis, a fatal pleiotropic disease currently managed symptomatically. Understanding the gating mechanism will help target drug development aimed at alleviating and curing the disease.
doi:10.4103/1817-1737.98842
PMCID: PMC3425041  PMID: 22924067
ATP-binding cassette proteins; cystic fibrosis transmembrane conductance regulator; cystic fibrosis; gating mechanism
18.  Predicting tobacco use among high school students by using the global youth tobacco survey in Riyadh, Saudi Arabia 
Annals of Thoracic Medicine  2012;7(3):122-129.
OBJECTIVE:
To identify the predictors that lead to cigarette smoking among high school students by utilizing the global youth tobacco survey in Riyadh, Kingdom of Saudi Arabia (KSA).
METHODS:
A cross-sectional study was conducted among high school students (grades 10–12) in Riyadh, KSA, between April 24, 2010, and June 16, 2010.
RESULTS:
The response rate of the students was 92.17%. The percentage of high school students who had previously smoked cigarettes, even just 1–2 puffs, was 43.3% overall. This behavior was more common among male students (56.4%) than females (31.3%). The prevalence of students who reported that they are currently smoking at least one cigarette in the past 30 days was 19.5% (31.3% and 8.9% for males and females, respectively). “Ever smoked” status was associated with male gender (OR = 2.88, confidence interval [CI]: 2.28–3.63), parent smoking (OR = 1.70, CI: 1.25–2.30) or other member of the household smoking (OR = 2.11, CI: 1.59–2.81) who smoked, closest friends who smoked (OR = 8.17, CI: 5.56–12.00), and lack of refusal to sell cigarettes (OR = 5.68, CI: 2.09–15.48).
CONCLUSION:
Several predictors of cigarette smoking among high school students were identified.
doi:10.4103/1817-1737.98843
PMCID: PMC3425042  PMID: 22924068
Adolescents; cigarettes; Saudi Arabia; tobacco
19.  MMP1-1607(1G>2G) polymorphism and the risk of lung cancer in Lebanon 
Annals of Thoracic Medicine  2012;7(3):130-132.
CONTEXT:
Matrix metalloproteinases (MMPs) are a family of enzymes that degrade various components of the extracellular matrix and are involved in the development and progression of cancer. Lung cancer is the most commonly diagnosed cancer in Lebanon. MMP1 is responsible for degrading stromal collagens, which enhance the ability of neoplastic cells to cross basal membrane of both the endothelium and the vascular endothelium. A recent meta-analysis has suggested that the MMP1-1607 2G allele may be associated with an increased risk for certain types of cancers.
AIM:
This study was undertaken to investigate the association between guanine insertion polymorphism in the MMP1 promoter and the susceptibility to lung cancer in the Lebanese population.
SETTINGS AND DESIGN:
This case-control study was conducted on 41 patients with lung cancer and 51 age-matched healthy controls, recruited from different regions of Lebanon.
METHODS:
Cases were histologically confirmed lung cancer patients obtained from different hospitals in Lebanon. Controls were healthy unrelated individuals with no history of cancer or genetic diseases. All subjects were genotyped for MMP1 -1607(1G>2G) polymorphism using polymerase chain reaction-restriction fragment length polymorphism method (PCR-RFLP).
RESULTS:
No statistically significant differences were found when genotype and allele distribution of MMP1 -1607(1G>2G) polymorphism were compared between patients with lung cancer and controls [P= 0.6 by chi-squared test on a 3×2 contingency table; allelic P=0.61, OR (95% CI) = 1.18 (0.60-2.31)].
CONCLUSION:
Our data shows that MMP1 promoter polymorphism is not associated with lung cancer susceptibility in the Lebanese population.
doi:10.4103/1817-1737.98844
PMCID: PMC3425043  PMID: 22924069
Lebanon; lung cancer; MMP1; polymorphism
20.  Prevalence of short sleep duration and its association with obesity among adolescents 15- to 19-year olds: A cross-sectional study from three major cities in Saudi Arabia 
Annals of Thoracic Medicine  2012;7(3):133-139.
BACKGROUND:
Adequate sleep has been considered important for the adolescent's health and well being. On the other hand, self-imposed sleep curtailment is now recognized as a potentially important and novel risk factor for obesity. The present study aimed to assess the prevalence of short sleep duration and its association with obesity among Saudi adolescents.
METHODS:
This is a school-based cross-sectional study with self-reported sleep questionnaires. It was conducted during the years 2009/2010 in three cities in Saudi Arabia; Al-Khobar, Jeddah, and Riyadh. Participants were 2868 secondary-school males (1379) and females (1389) aged 15 to 19 years, randomly selected using a multistage stratified sampling technique. Measurements included weight, height, waist circumference, BMI, and sleeping duration. Logistic regression analysis while adjusted for age, gender, and location was used to examine the associations between sleep duration and obesity measures.
RESULTS:
The mean (SD) of sleep duration was 7.2 (1.6) hours/day with no significant differences between males and females. About 31% of the participants obtain less than 7 hours of sleep per day, while approximately 50% of the sample gets less than 8 hours of daily sleep. Two-way ANCOVA results while controlling for the effect of age revealed a significant gender by school-type interaction (P<0.001). In addition, adequate sleep duration increased the odds of having normal weight (adjusted odds ratios = 1.28, 95% CI = 1.08-1.50, P = 0.003).
CONCLUSION:
The present study observed a high prevalence of short sleep duration among Saudi adolescents 15- to 19-year olds and that short sleep duration was significantly associated with increased risk of overweight and obesity. Future interventions should investigate whether adopting a healthy lifestyle by adolescents with short sleep duration would improve their sleeping habits or not.
doi:10.4103/1817-1737.98845
PMCID: PMC3425044  PMID: 22924070
Adolescents; obesity; Saudi Arabia; sleep duration; waist circumference
21.  Comparison of the effect of high-dose inhaled budesonide and fluticasone on adrenal function in patients with severe chronic obstructive pulmonary disease 
Annals of Thoracic Medicine  2012;7(3):140-144.
INTRODUCTION:
Chronic obstructive pulmonary disease (COPD) is a leading cause of respiratory-related morbidity and mortality. Inhaled steroids are frequently used in patients with moderate to severe disease and may lead to adrenal suppression.
OBJECTIVES:
The aim of this study was to compare the effect of inhaled budesonide/formoterol with inhaled fluticasone/salmeterol in severe COPD.
METHODS:
It was a prospective open-label crossover study of 22 patients. Adrenal suppression was measured by overnight urinary cortisol/creatinine ratio. The measurements were taken while patients were on either combination for at least 4 weeks.
RESULTS:
A total of 12 patients completed the study. The mean age was 64 years (8 males, 4 females). The mean FEV1 was 1 L (range, 0.5-1.8). There was no significant difference in adrenal suppression measured by overnight urinary cortisol/creatinine ratio (budesonide 5.2 ± 4.3, fluticasone 4.7 ± 3.1; 95% CI -2.2 to 1.2; P = 0.52) and urinary cortisol concentration (budesonide 51 ± 53, fluticasone 43 ± 31 [nmol/l]; 95% CI -35 to 20; P = 0.56).
CONCLUSION:
Inhaled budesonide and fluticasone have no significantly different effect on adrenal function in moderate to severe COPD. The adverse event profile of high-dose inhaled steroids should not influence the choice of medication.
doi:10.4103/1817-1737.98846
PMCID: PMC3425045  PMID: 22924071
Adrenal suppression; COPD; cortisol-creatinine ratio; inhaled corticosteroids
22.  The use of thoracoscopy to enhance medical students’ interest and understanding of thoracic anatomy 
Annals of Thoracic Medicine  2012;7(3):145-148.
AIM:
To develop a video-based educational tool designed for teaching thoracic anatomy and to examine whether this tool would increase students’ stimulation and motivation for learning anatomy.
METHODS:
Our video-based tool was developed by recording different thoracoscopic procedures focusing on intraoperative live thoracic anatomy. The tool was then integrated into a pre-existing program for first year medical students (n = 150), and included cadaver dissection of the thorax and review of clinical problem scenarios of the respiratory system. Students were guided through a viewing of the videotape that demonstrated live anatomy of the thorax (15 minutes) and then asked to complete a 5-point Likert-type questionnaire assessing the video's usefulness. Apart from this, a small group of entirely different set of students was divided into two groups, one group to view the 15-minute video presentation of thoracoscopy and chest anatomy and the other group to attend a 15-minute lecture of chest anatomy using radiological images. Both groups took a 10-item pretest and post-test multiple choice questions examination to assess short-term knowledge gained.
RESULTS:
Of 150 medical students, 119 completed the questionnaires, 88.6% were satisfied with the thoracoscopic video as a teaching tool, 86.4% were satisfied with the quality of the images, 69.2% perceived it to be beneficial in learning anatomy, 96.2% increased their interest in learning anatomy, and 88.5% wanted this new teaching tool to be implemented to the curriculum. Majority (80.7%) of the students increased their interest in surgery as a future career. Post-test scores were significantly higher in the thoracoscopy group (P = 0.0175).
CONCLUSION:
Incorporating live surgery using thoracoscopic video presentation in the gross anatomy teaching curriculum had high acceptance and satisfaction scores from first year medical students. The video increased students’ interest in learning, in clinically applying anatomic fact, and in surgery as a future career.
doi:10.4103/1817-1737.98847
PMCID: PMC3425046  PMID: 22924072
Medical students; thoracic anatomy; thoracoscopy
23.  Micrometastasis in non–small-cell lung cancer: Detection and staging 
Annals of Thoracic Medicine  2012;7(3):149-152.
BACKGROUND:
The clinical relevance of bone marrow micrometastasis (BMM) in non–small-cell lung cancer is undetermined, and the value of such analyses in advanced stage patients has not been clearly assessed previously. This study was conducted to estimate the accuracy of both polymerase chain reaction (PCR) and immunohistochemistry (IHC) in micrometastases detection and determine the best site for bone marrow biopsy in order to find micrometastasis.
METHODS:
This prospective cross-sectional study was performed in the Department of Thoracic Surgery, Alzahra University Hospital from September 2008 to June 2009. To evaluate the bone marrow, a 3-cm rib segment and an aspirated specimen from the iliac bone prior to tumor resection were taken. PCR and IHC were performed for each specimen to find micrometastasis.
RESULTS:
Of 41 patients, 14 (34%) were positive for BMM by PCR compared with two positive IHC (4.8%). All BMMs were diagnosed in rib segments, and iliac specimens were all free from metastatic lesion. Our data showed no significant association between variables such as age, sex, histology, tumor location, side of tumor, involved lobe, smoking, or weight loss and presence of BMM.
CONCLUSION:
PCR could use as a promising method for BMM detection. BMM in a sanctuary site (rib) is not associated with advanced stages of lung cancer. In addition, when predictor variables such as age, sex, histology, tumor location, smoking, or weight loss are analyzed, no correlation can be found between micrometastasis prevalence and any of those variables.
doi:10.4103/1817-1737.98848
PMCID: PMC3425047  PMID: 22924073
IHC; lung cancer; micrometastasis; PCR
24.  Effect of drinking Arabian Qahwa on fractional exhaled nitric oxide levels in healthy nonsmoking Saudi adults 
Annals of Thoracic Medicine  2012;7(3):153-156.
OBJECTIVES:
Fractional exhaled nitric oxide (FENO) is an emerging marker of inflammation in respiratory diseases. However, it is affected by a number of confounding factors. We aimed to study the effect of drinking Arabian Qahwa on FENO in non-smoking Saudi healthy adults.
METHODS:
We recruited 12 nonsmoker healthy male adults aged 36.6 ± 2.7 (21-50) years. All subjects were free from acute respiratory infections or allergies and had normal ventilatory functions and serum IgE levels. At 8 am in the morning, their baseline values of FENO were recorded. They had not taken tea or coffee in the morning and had taken similar light breakfast. They were given three cups of Arabian Qahwa to drink and then after every 30 minutes, serial levels of FENO were recorded.
RESULTS:
Average FENO levels at baseline were 28.73 ± 9.33 (mean ± SD) parts per billion (ppb). The mean FENO levels started to decrease significantly after 30 minutes of drinking Arabian Qahwa (P=0.002). This decrease in FENO level was further observed till two hours after Qahwa drinking and then it started to increase in next 90 minutes but still was significantly lower than the baseline (P=0.002). The mean FENO level recorded after 4 hours was 27.22 ± 10.22 (P=0.039).
CONCLUSIONS:
FENO levels were significantly lowered by intake of Arabian Qahwa and this effect remains for about 4 hours. Therefore, history of recent Qahwa intake and abstinence is essential before performance of FENO and its interpretation.
doi:10.4103/1817-1737.98849
PMCID: PMC3425048  PMID: 22924074
Arabian Qahwa; adults; fractional exhaled nitric oxide; non smoker
25.  Novel approach for the management of sub-massive pulmonary embolism 
Annals of Thoracic Medicine  2012;7(3):157-161.
BACKGROUND:
Right ventricular (RV) dysfunction has been identified as a poor prognostic indicator in sub-massive pulmonary embolism (SPE). We hypothesized that using selective vasodilator agent is beneficial in improving RV function in patients with this condition.
METHODS:
We used inhaled prostacyclin analogue (Iloprost, Ventavis®) in five patients with SPE. Helical computerized tomography angiogram was confirmatory for pulmonary embolism and echocardiography was used to evaluate the RV status. All patients received inhaled Iloprost, 2.5 to 5 μg every 4 hours for 3 weeks.
RESULTS:
Patients were prospectively followed for 3 months. They were assessed at baseline before starting Iloprost treatment and at 3 days, 3 weeks, and 3 months after treatment. All patients showed significant improvement in their functional class, Borg dyspnea score, NT pro-BNP level, and echocardiographic parameters.
CONCLUSION:
In SPE, directing therapy toward decreasing pulmonary vascular resistance improves the associated pulmonary hemodynamic compromise and improves RV function.
doi:10.4103/1817-1737.98850
PMCID: PMC3425049  PMID: 22924075
Iloprost; pulmonary hypertension; pulmonary vascular resistance; right ventricular function; sub-massive pulmonary embolism

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