Which Airway Pressure Should Be Applied During Breath‐hold in Dogs Undergoing Thoracic Computed Tomography?

Abstract

This randomized controlled trial study aimed to identify the optimal positive pressure (PP) level that can clear atelectasis while avoiding pulmonary hyperinflation during the breath-hold technique in dogs undergoing thoracic computed tomography (CT). Sixty dogs affected by mammary tumors undergoing thoracic CT for the screening of pulmonary metastases were randomly assigned to six groups with different levels of PP during the breath-hold technique: 0 (control), 5 (PP5), 8 (PP8), 10 (PP10), 12 (PP12), and 15 (PP15) cmH2 O. The percentage of atelectatic lung region was lower in the PP10 (3.7 ± 1.1%; P = 0.002), PP12 (3.4 ± 1.3%; P = 0.0001), and PP15 (2.8 ± 0.9%; P = 0.006) groups than in the control group (5.0 ± 2.3%), and the percentage of poorly aerated lung region was lower in the PP8 (15.1 ± 2.6%; P = 0.0009), PP10 (13.0 ± 2.0 %; P = 0.002), PP12 (13.0 ± 2.2 %; P = 0.0002), and PP15 (11.1 ± 1.9%; P = 0.0002) groups than in the control group (19.8 ± 5.0). The percentage of normally aerated lung region, however, was higher in the PP10 (79.7 ± 4.1%; P = 0.005), PP12 (79.8 ± 5.1%; P = 0.0002), and PP15 (80.2 ± 4.9%; P = 0.002) groups than in the control group (73.4 ± 6.6%). A PP of 10-12 cmH2 O during the breath-hold technique should be considered to improve lung aeration during a breath-hold technique in dogs undergoing thoracic CT.

CT is helpful for the detection and presurgical planning of lung perforation in dogs with spontaneous pneumothorax induced by grass awn migration: 22 cases

“…In 17 (77.3%) patients, the lung lobes retraction was too severe for adequate evaluation and additional procedures (thoracentesis, thoracic tube placement, and continuous aspiration) were performed before further acquisitions. Positive pressure ventilation and breath hold of 12 cm H 2 O, as previously reported, were performed to reduce motion artifacts . The acquisition process was repeated 30 seconds after a 700 mg/kg handmade intravenous injection of iodinated contrast medium (Ultravist, Bayer Healthcare, Berlin, Germany) containing 350 mg/mL of iodine.…”

Utility of Computed Tomographic Angiography for Pulmonary Hypertension Assessment in a Cohort of West Highland White Terriers With or Without Canine Idiopathic Pulmonary Fibrosis

“…In our study, we chose to use a 100% FiO 2 . Indeed, in the veterinary literature, 100% FiO 2 is still commonly used during thoracic CTA procedure (36,(54)(55)(56)(57). This protocol was selected when the present study started in 2013 and was maintained throughout the study to allow obtention of comparable measures of the heart and pulmonary vasculature.…”

64-multidetector CT anatomical assessment of the feline bronchial and pulmonary vascular structures

“…21,22 Based on previous literature, a peak inspiration pressure of 15 cm H 2 O was chosen in order to avoid motion artefacts during image acquisition. 7,8,[12][13][14]23,24 Pulmonary arteries predominantly ran dorsolaterally to the corresponding bronchus, whereas pulmonary veins ran ventromedially to the corresponding bronchus. An exception was seen in the accessory lung lobe, where the pulmonary arteries ran ventrally and the pulmonary veins ran dorsally to their corresponding bronchus.…”