RESUMEN
Objectives: The present study was designed to evaluate the role of chest ultrasound in the diagnosis of acute pulmonary embolism (PE) and determine its accuracy using multi-detector CT-pulmonary angiography (MD-CTPA) as a gold standard technique for PE diagnosis. Patients and methods: A prospective case-control study was performed with 75 patients who presented to the emergency department of Minia Cardiothoracic University Hospital with clinical suspicion of PE. All patients were evaluated clinically and by laboratory tests to assess the risk of PE. Thoracic ultrasound (TUS) was then performed for all patients for signs suggestive of PE. Finally, MD-CTPA was performed to confirm or exclude the presence of PE. Results: Patients were subdivided into two groups according to the result of MD-CTPA; group I (patients with PE) and group II (control group without PE). In our study, PE was present in the lower lobe in 75% of cases, then in the middle in 13% and in the upper lobe in 3.8% of cases. The majority of lesions in TUS were wedge-shaped lesions. No vascular flow was detected in 83% of PE-confirmed patients. The current study revealed that TUS has 81.25% sensitivity, 95% specificity, 98.3% positive predictive value, 77.2% negative predictive value and 87% accuracy in the diagnosis of PE. Univariate regression analysis revealed that the presence of wedge-shaped pleural-based lesions in grayscale US and the absence of flow signals by colour Doppler sonography (CDS) increase the possibility of PE. Wedge-shaped pleural-based lesions increase the possibility of PE by 1.48 times (P=0.0001), and the absence of flow signals by CDS increases the possibility of PE by 92.89 times (P=0.00001). Multivariate regression analysis revealed that adding absent flow signals by CDS to wedge-shaped pleural-based lesions by grayscale US increases the possibility of a PE diagnosis by 50.28 times (P=0.001). Conclusion: Chest ultrasound is a simple, safe, noninvasive, inexpensive, bedside diagnostic radiological technique that can be used in the emergency department for suspected PE or as an alternative to MD-CTPA when CTPA is contraindicated. Wedge-shaped lesions and the absence of flow signals by CDS increase the diagnostic value of ultrasound for PE.
RESUMEN
The aim of this study is to measure the degree of compliance with hand hygiene practices among health-care workers (HCWs) in intensive care facilities in Aseer Central Hospital, Abha, Saudi Arabia, before and after a multimodal intervention program based on WHO strategies. Data were collected by direct observation of HCWs while delivering routine care using standardized WHO method: "Five moments for hand hygiene approach". Observations were conducted before (February-April 2011) and after (February-April 2013) the intervention by well-trained, infection-control practitioners during their routine visits. The study included 1182 opportunities (observations) collected before and 2212 opportunities collected after the intervention. The overall, hand hygiene compliance increased significantly from 60.8% (95% CI: 57.9-63.6%) before the intervention to reach 86.4% (95% CI: 84.9-97.8%) post-intervention (P=0.001). The same trend was observed in different intensive care facilities. In logistic regression analyses, HCWs were significantly more compliant (aOR=3.2, 95% CI: 2.6-3.8) after the intervention. Similarly, being a nurse and events after patient contact were significant determinants of compliance. It is important to provide sustained intensified training programs to help embed efficient and effective hand hygiene into all elements of care delivery. New approaches like accountability, motivation and sanctions are needed.