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Selected Publication:

Type of publication: Journal Article
Type of document: Full Paper

Year: 2012

Authors: Schramel, J; Nagel, C; Auer, U; Palm, F; Aurich, C; Moens, Y

Title: Distribution of ventilation in pregnant Shetland ponies measured by Electrical Impedance Tomography.

Source: Respir Physiol Neurobiol. 2012; 180(2-3):258-262

Authors Vetmeduni Vienna:

Auer Ulrike
Aurich Christine
Moens Yves
Nagel Christina
Palm Franziska
Schramel Johannes

Vetmed Research Units
University Clinic for Small Animals, Clinical Unit of Anaesthesiology and Perioperative Intensive-Care Medicine
University Clinic for Small Animals, Clinical Unit of Obstetrics, Gynaecology and Andrology
Insemination and Embryotransfer Platform

The regional distribution of ventilation in conscious standing pregnant Shetland pony mares was investigated by Electrical Impedance Tomography (EIT). Six ponies were repeatedly examined a minimum of four weeks prior to (antepartum, AP) until three weeks after parturition (postpartum, PP). From the cross-sectional ventilation image the ventral to dorsal (V/D), left to right (L/R) ventilation distribution ratio and the relative ventilation in four horizontal regions of interest (ROI) placed symmetrically in the chest was analyzed. Antepartum V/D was 0.74 ± 0.09 on day -28 ± 3 (AP28) and decreased to 0.68 ± 0.10 on day -3 ± 2 (AP3). Postpartum V/D increased significantly (p<0.05) to 0.96 ± 0.08 on day 7 ± 2 (PP7). The L/R ventilation distribution remains unaffected. Ventilation in the most ventral ROI was significantly lower on days AP28 and AP3 compared to PP7. These results suggest that in Shetland ponies late pregnancy compromises the ventilation in ventral (dependent) lung regions. We demonstrated the feasibility of a repeated EIT measurement in standing conscious ponies.

Keywords Pubmed: Animals
Body Weight
Cross-Sectional Studies
Electric Impedance*
Postpartum Period
Pregnancy, Animal/physiology*
Pulmonary Ventilation/physiology*
Tidal Volume

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