Search PubMed⌕ Search

Biomedical subjects

B Khalil

Publications and source records attributed to B Khalil.

7 recordsLinked to original sources
PubMed1997

Line-Mixing Effects in Q Branches of CO2

A theoretical model based on the energy corrected sudden (ECS) approximation is used in order to account for line-mixing effects in Delta left and right arrow Pi infrared Q branches of 12C16O2. Its quality is demonstrated by comparisons with numerous laboratory spectra of CO2-He and CO2-N2 mixtures: three Q branches in the 4 and 17 μm regions are investigated at room temperature in a wide pressure range. The influence of mixing between Q(J) lines associated with odd and even values of the rotational quantum number J is demonstrated and analyzed in detail. It is shown that, in contrast to available fitting law approaches, the ECS model correctly predicts the influence of the parity of the rotational quantum numbers J and J' on coupling between the Q(J) and Q(J') lines. Comparisons between the effects of collisions of CO2 with N2 and He are made and analyzed. They show that these two systems involve different line couplings within the Q branch. Copyright 1997 Academic Press. Copyright 1997Academic Press

Journal Article↗
PubMed1996

Aortoesophageal fistula and double aortic arch: two important points in management.

Two children with double aortic arch and aortoesophageal fistula (AEF) are reported to warn of this lethal complication of double aortic arch and to stress important points in the diagnosis and management. A review of the records of 30 children with double aortic arch disclosed two patients who had AEF. The first patient had respiratory distress and repair of a vascular ring (double aortic arch) at 5 weeks of age. At 9 weeks of age, because of difficulty with tracheal extubation, aortopexy was performed. Ten days later, profuse upper gastrointestinal bleeding required control by a Sengstaken-Blakemore (SB) tube. Thoracotomy and repair AEF was accomplished successfully under cardiopulmonary bypass. The second patient had hepatomegaly and Pseudomonas sepsis. Endotracheal and nasogastric intubation was necessary, and subsequently the double aortic arch was demonstrated by magnetic resonance imaging (MRI). On the 48th day of hospitalization, life-threatening upper gastrointestinal hemorrhage required insertion of an SB tube. Cardiopulmonary bypass allowed successful repair of the AEF. Both children are alive, after 3 and 2 years (respectively). These patients demonstrate that AEF must be diagnosed clinically (no imaging technique is effective); its history and physical presentation are typical. The SB tube is effective for controlling the hemorrhage until cardiopulmonary bypass can be performed to allow repair.

Airway Obstruction↗
PubMed1996

Celiac disease in Arabs.

A systematic study of celiac disease in a defined population of Arab children has not been previously reported. We therefore performed a prospective study to determine the incidence and clinical presentation of celiac disease in Jordanian children. A total of 34 (12 boys and 22 girls) cases were diagnosed over a period of 36 months. Nine cases were clustered in three families. The incidence was calculated to be 1:2,800 live births. The mean age at presentation was 4.6 years (range 0.3-13), but it was 8.4 years at the time of diagnosis. Diarrhea was the main initial symptom in 15 (44%) patients. Other signs and symptoms included recurrent abdominal pain in five patients (14%), short stature in four (12%), abdominal distension in three (9%), constipation in three (9%), pallor and recurrent mouth ulcers in two patients each. At the time of diagnosis, 24 (71%) had hypochromic microcytic anemia, and nine (26%) had rickets. The relatively high incidence of celiac disease may be related to the large wheat consumption in this population (135 kg/head/year), and the late onset could be related to the widespread prevalence of prolonged breast-feeding in Jordan (12 months) and late introduction of cereals (6.2 months) in children with late presentation. The delay in diagnosis might be due to the presence of other diseases clinically resembling celiac disease in our community.

Adolescent↗
PubMed1995

Prevalence of Helicobacter pylori in patients with gall stones before and after cholecystectomy: a longitudinal study.

Fifty six patients with gall stones were enrolled in this study to assess the presence of Helicobacter pylori in gastric mucosa before and after cholecystectomy. Samples were taken from gastric juice and antral mucosa through endoscopy performed on these patients before and after the operation. Gastric juice was examined for bile salt concentration as an indicator of duodenogastric reflux. Antral mucosa was studied for the presence of H pylori and inflammatory response. Duodenogastric reflux was significantly increased (p < 0.001) and H pylori significantly decreased (p < 0.01) in the postoperative period. Mucosal inflammation and its activity were less in the postoperative period but the differences did not reach statistically significant values.

Adult↗
PubMed1985

Cholangio-venous reflux as a cause of recurrent hyperamylasemia in choledochal dilatation with anomalous pancreaticobiliary ductal union: an experimental study.

Cylindrical choledochal dilatation, associated with anomalous pancreaticobiliary ductal union, causes recurrent episodes of right hypochondrial pain, vomiting, and fever. The symptoms are very often accompanied by hyperamylasemia, which is generally considered to be due to acute pancreatitis. However, our clinical experience and experimental studies have led us to the conclusion that pancreatitis is not the sole cause of hyperamylasemia. In this paper we report our further investigations of the cause of the hyperamylasemia. In 22 mongrel adult dogs, intracholedochal infusion was performed under a continuous hydrostatic pressure of 20 cm H2O for 2 hours. Solutions of amylase from three different sources and a lipase were used in the range of concentrations found clinically in the bile within a cylindrical choledochal dilatation. In the 3 groups, hyperamylasemia was proven by quantitative estimation of serum amylase level and/or by the changes in specific amylase isozymes. Lipase was also shown to transfer into the blood stream. In an additional experiment on 5 dogs, only the extrahepatic biliary tree, including the gallbladder, was infused with a solution of amylase from Bacillus subtilis. This produced no increase in the serum amylase. Our experiments suggest that amylase passes from the hepatocholedochal system into the blood stream. This phenomenon has long been known as cholangiovenous reflux.

Amylases↗