Israel Medical Association Journal

Background: During an influenza pandemic, clinicians need easily available clinical and laboratory criteria to distinguish influenza from similar respiratory illnesses. We compared A/H1N1/2009-polymerase chain reaction (PCR)-positive and matched PCR-negative hospitalized patients with suspected H1N1 influenza to identify factors that could assist physicians at patient admission.

Objectives: To identify factors significantly associated with A/H1N1/2009 infection.

Methods: A group of 145 patients with PCR-confirmed A/H1N1 2009 influenza admitted between 27 May 2009 and 3 December 2009 was matched with 145 PCR-negative patients by age, epidemiological week and pregnancy status. Epidemiological and clinical parameters and radiological findings on initial chest X-ray were compared between the two groups.

Results: Asthma (PCR+ 26%, PCR- 12%, P = 0.006) and military service (PCR+ 13%, PCR- 4%, P = 0.15) were associated with PCR-positive status in non-pregnant patients. At presentation, fever, cough, myalgia and fulfilling the pandemic influenza case definition were significantly more frequent in non-pregnant PCR+ patients (62/90/43/59% in PCR+ versus 38/69/30/35% in PCR-). In pregnant patients, fever and fulfilling the case definition were significantly associated with PCR-positive status. Mean leukocyte and absolute lymphocyte counts were significantly lower in both pregnant and non-pregnant PCR-positive patients. Significantly more PCR-negative non-pregnant patients (43% vs. 22% PCR+, P = 0.004) had abnormal chest X-ray (CXR) findings on presentation. In PCR-positive patients, patchy consolidation and interstitial infiltrates were the most common abnormalities.

Conclusions: Under the conditions generated by the A/H1N1/2009 pandemic, radiological findings did not distinguish reliably between influenza and other febrile respiratory illnesses. Asthma, military service, the pandemic case definition (particularly fever, cough and myalgia) and lymphopenia were associated with confirmed H1N1 infection.
 

Attention deficit hyperactivity disorder (ADHD) is among the most prevalent chronic health disorders affecting school-age children. The disorder is the subject of much debate for several reasons, the major one being the diagnostic process, which in some aspects is unstructured and can be relatively easily biased. The impact of undiagnosed or misdiagnosed ADHD on the lives of many children can be severe. Therefore, it is important to understand the complexities of the diagnostic procedure in ADHD, including the cultural bias effect, the limitations of the DSM-IV-TR definitions, the effect of comorbid conditions on the diagnostic process, the gene-environment interactions, and the need to compose an objective, more accurate, and generally accepted diagnostic battery of tests. This review addresses the diagnostic difficulties of ADHD and considers some steps that would make ADHD a more easily identifiable disorder.
 

Idiopathic pulmonary arterial hypertension (IPAH) is an isolated small-vessel disease comprising vasoconstriction, remodeling and thrombosis of small pulmonary arteries. However, there is evidence that IPAH[1] does not respect anatomic boundaries and might extend into large vessels such as large central thrombi. On the other hand, chronic thromboembolic pulmonary hypertension (CTEPH) represents a distinct category of pulmonary hypertension as it is thought to be due to an occlusion of the major pulmonary arteries following a thromboembolic event. However, it is currently evident that in most patients, there is a concomitant small-vessel disease. The involvement of both small and large vessels in both IPAH and CTEPH[2] together with a high incidence of silent thromboembolic events might create difficulties in identifying the true cause of pulmonary hypertension. An accurate diagnosis of the cause determines the management and prognosis. Patients with CTEPH can potentially be offered curative surgery in the form of pulmonary endarterectomy; however, oxygen, vasodilators, anticoagulation, and lung transplantation are more feasible options for IPAH.

Background: Major advances in the treatment of perinatal asphyxial–hypoxic ischemic encephalopathy followed the translation of hypothermia animal studies into successful randomized controlled clinical trials that substantially influenced the current standard of care.

Objectives: To present our preliminary experience with the first cases of clinical application of therapeutic hypothermia for PA-HIE[1] in what we believe is the first report on non-experimental hypothermia for PA-HIE from Israel.

Methods: We reviewed the medical records, imaging scans, electroencephalograms and outcome data of the six identified asphyxiated newborns who were managed with hypothermia in our services in 2008–2009.

Results: All asphyxiated newborns required resuscitation and were encephalopathic. Systemic hypothermia (33.5ºC) was begun at a median age of 4.2 hours of life (range 2.5–6 hours) and continued for 3 days. All six infants showed a significantly depressed amplitude integrated electroencephalography background, and five had electrographic seizures. One infant died (16%) after 3.5 days. Major complications included fat necrosis and hypercalcemia (n=1), pneumothorax (n=1), and meconium aspiration syndrome (n=2). None of the infants developed major bleeding. Neurodevelopmental follow-up of the five surviving infants at median age 7.2 months (4.1–18.5 months) revealed developmental delays (Battelle screening), with their motor scores ranging from -1 to +1 standard deviation (Bayley scale). None developed feeding problems, oculomotor abnormalities, spasticity or seizures.

Conclusions: Our preliminary experience with this novel modality in a large Tel Aviv neonatal service is consistent with the clinical findings of published trials.

Background: Most aspects of attention-deficit/hyperactivity disorder diagnosis rely on subjective judgment. Computerized continuous performance tests are designed to improve the validity of the process but are controversial due to low odds ratios. There is a need to find more definitive measures of assessment.

Objectives: To test the validity and reliability of a new tool, a computerized continuous performance functions test, which includes a multi-task approach designed to achieve a higher odds ratio of assessment.

Methods: We applied this test to 58 children aged 6–12 years: 45 were diagnosed as ADHD[1] and 13 non-ADHD children served as a control group.

Results: The CPF[2] test was able to differentiate between non-ADHD and ADHD children. CPF test results were more accurate than other continuous performance tests. The results were statistically significant in all test parameters, confirming the test's validity and reliability. 

Conclusions: The CPF test includes a combination of tasks based on an algorithm designed to test several domains of attention. In this pilot study the CPF test was found to be a valid and reliable tool for the diagnosis of ADHD in children. This test might increase the diagnostic utility of computerized tests. The research points to the need for developing a more definitive process for ADHD diagnosis.

Background: An outbreak of pertussis occurred in a daycare center with 87.5% vaccination coverage.

Objectives: To assess the effectiveness of the acellular pertussis vaccine and prevention of pertussis after chemoprophylaxis with azithromycin.

Methods: We studied 31 daycare children aged 3–5.5 years exposed to a child with pertussis. Nasopharyngeal swabs were obtained for Bordetella pertussis culture and polymerase chain reaction initially, and at days 21 and 60 of follow-up, in cases exhibiting symptoms.

Results: Of the 31 daycare children 6 (19%) tested positive for B. pertussis by PCR[1], 4 of whom had not been vaccinated against the disease. Of the two vaccinated children who contracted pertussis, one had milder symptoms and the other was asymptomatic. The incidence of pertussis was significantly lower in the vaccinated group (2/27) than in the unvaccinated group (4/4) (P = 0.000), with efficacy of the vaccine calculated to be 92.5%. Azithromycin chemoprophylaxis was taken only by 14 of the 25 exposed children (56%). On day 21 follow-up, there was no further laboratory-diagnosed B. pertussis cases in any of the exposed children, regardless of whether or not chemoprophylaxis was taken.

Conclusions: Based on the children’s clinical manifestations and PCR findings a pertussis outbreak had occurred in the daycare center studied. Our findings support the importance of pertussis vaccination since all the unvaccinated children in the daycare center contracted the infection.