Validation of a suprasternal pressure transducer for apnea classification during sleep

STUDY OBJECTIVES: To validate a new method of evaluation of respiratory efforts during polysomnographic recordings. Setting: NA PARTICIPANTS: 26 patients with sleep apnea syndrome, either during diagnostic assessment (n=16) or under nasal continuous positive airway pressure (n=10). METHODS: This method consists of measuring suprastemal pressure by a pressure transducer placed over the trachea above the sternal notch (Pst). It was compared to the reference method (ie, esophageal pressure) during the same polysomnogram. RESULTS: The analysis was based on 3,261 episodes of apnea, classified as obstructive in 2,556 cases, mixed in 347 cases, and central in 358 cases according to the esophageal pressure monitor. The concordance between the two methods was very good, with a sensitivity of Pst of 99.4% for the detection of apneas with respiratory efforts and a specificity of 93.6%. Twenty-three (6.4%) of the 358 central apneas were classified by Pst as apneas with respiratory efforts and 18 of the 353 central apneas classified by Pst were actually apneas with respiratory efforts on the esophageal pressure monitor. CONCLUSION: The suprasternal pressure transducer, which presents a good sensitivity and a good specificity for identification of respiratory efforts, can be used to classify apneas during polysomnographic recordings in clinical practice.     

Genotypic exploration of a hospital neonatal outbreak due to Klebsiella pneumoniae producing extended-spectrum-betalactamase]

BACKGROUND: The aim of the study was to explore nosocomial neonatal outbreak of Klebsiella pneumoniae producing extended-spectrum-betalactamase by macrorestriction genotyping. PATIENTS AND METHODS: Over a 25 days period, a hospital neonatal outbreak due to Klebsiella pneumoniae producing extended-spectrum-betalactamase affected 14 newborn infants admitted to a university hospital in Sousse (Tunisia). We collected 21 strains of Klebsiella pneumoniae producing extended-spectrum-betalactamase. Susceptibility testing to 17 antibiotics was determined. Macrorestriction genotyping of strains was determined by pulsed-field-electrophoresis. Neonatal intensive care unit survey was undertaken. RESULTS: A macrorestriction genotyping subdivided 21 strains into 3 clonally groups. Only cefoxitin, colistin, imipenem, amikacin and quinolons were active on the whole of strains. All infected babies died. The hygiene insufficiency and contamination of transfusion products at the time of their dividing in neonatal intensive care unit were incriminated. Handholding due to work overcharge was the main cause of bacterial diffusion. CONCLUSION: Multiclonal outbreak of Klebsiella pneumoniae producing extended-spectrum-betalactamase appeared following hygiene insufficiency related to work overcharge.     

Genetic analysis of HAV strains in Tunisia reveals two new antigenic variants

To evaluate the genetic variability of hepatitis A virus (HAV) isolates in Tunisia, serum samples were collected from 99 patients in different Tunisian areas in 2003 containing 92 cases with acute hepatitis, five with severe acute hepatitis and two with fulminant hepatitis. The entire VP1 gene was amplified and sequenced. Sequences were then aligned and a phylogenetic analysis was performed. Additionally, the amino acid (aa) sequence of the VP1 was determined. The analysis of Tunisian HAV isolates revealed that all the isolates were sub-genotype IA with 96.4%–99.8% of identity and showed the emergence of two novel antigenic variants. The Tun31-03 antigenic variant, with a 38 aa deletion containing Met156, Val171, Leu174 and Ala176 and located between 150 and 187 aa of the VP1 protein where neutralization escape mutations, was found. The second antigenic variant, Tun36-03, was isolated from a patient with fulminant hepatitis and presented a substitution of Thr by Pro at position 10 of the VP1 protein. This amino acid is located in a peptide presenting an antigenically reactive epitope of the VP1 protein. This substitution has never been described previously.     

Place du Bilan Médical Périodique dans les Soins de Santé de Base en Tunisie

The objective of primary health care is to reduce mortality and morbidity. This kind of care was very efficient in communicable diseases, malnutrition and maternal and neonatal diseases; however, their impact on non communicable diseases and mental disorders control is not obvious. In Tunisia, primary health care was introduced in the early 1980s; a lot of progress were notified in particular in health of mothers and children in particular, but only slightly in non communicable diseases control and mental health promotion. Therefore, a new approach would be strongly recommended to remedy this situation. The Medical Periodic Check-up (MPC) implemented in North America would have a positive impact in the prevention and management of non communicable diseases. What would be the place of this MPC in primary health care in Tunisia? The MPC has two main objectives: the prevention of specific diseases and health promotion. However, despite its efficiency and usefulness, the MPC could be costly, especially for countries with limited resources. Current evidence suggests that the most appropriate approach would be to take periodic preventive health visits tailored to the level of risk. The frequency of visits depends on the age, sex and state of health of the individual. In conclusion, there are strong arguments in favor of the introduction of MPC in primary health care in Tunisia, especially among adults in non communicable diseases control strategy. However, it''s highly be recommended that the BMC should be oriented according to the risk levels in order to optimize resources. It is also important to educate and the public, especially women and young adults, to benefit from periodic medical and dental examinations.