Radiological findings of pneumonia in patients with swine-origin influenza A virus (H1N1)

Abstract

In our series, the most frequent pneumonia patterns observed during S-OIV (H1N1) virus were interstitial changes and patchy ground-glass appearance, mostly bilateral, and located in the lower lung zones. CT, performed in severely ill patients, confirmed the ARDS identified with chest X-rays, better depicting the features and extent of lung abnormalities.

‘Presenting CXR phenotype of H1N1’ flu compared with contemporaneous non-H1N1, community acquired pneumonia, during pandemic and post-pandemic outbreaks’

“…In addition to Aviram's early series, a number of further small studies of hospitalised H1N1 patients went on to demonstrate bilateral, 'patchy' and lower zone predominance as the dominant imaging findings [13][14][15][16][17], with some studies also supporting our findings of a predominantly peripheral distribution [6,11,[16][17][18][19]. Peripheral opacification on the chest X-ray is an atypical pattern for viral pneumonias [20] making this a useful defining and discriminatory feature.…”

H1N1 influenza A virus Related Pneumonia and Respiratory Failure

“…In a study, major radiological signs were reported as interstitial changes, ground glass opacities singly or together with interstitial changes, and consolidation; it was indicated that the involvement occurred particularly bilateral and in lower lobes. In the same study, ARDS signs were present in 7.5 % of the patients whilst pleural effusion attended in 10 % of the patients [2]. Similarly, the most commonly encountered signs in our study were interstitial changes, consolidation and ground glass opacities.…”

“…These signs vary and may manifest together. Symptoms of ARDS may develop in the patients, but pleural effusion is rare [2]. In a study, major radiological signs were reported as interstitial changes, ground glass opacities singly or together with interstitial changes, and consolidation; it was indicated that the involvement occurred particularly bilateral and in lower lobes.…”

H1N1 pneumonia: our experience in 50 patients with a severe clinical course of novel swine-origin influenza A (H1N1) virus (S-OIV)

“…Aree multifocali di opacità degli spazi aerei possono diventare rapidamente confluenti sulle radiografie del torace di controllo e rappresentano all'imaging una combinazione di danno alveolare diffuso, di emorragia e di polmonite in organizzazione, eventualmente con sovrapposta infezione batterica secondaria nelle fasi avanzate della malattia [1,20,22]. Il versamento pleurico è spesso assente [23]. Ci sono state poche importanti casistiche pubblicate sull'H1N1.…”