Key result
Radiographic evidence of pulmonary blood diversion to the upper lobes showed significant agreement (p<0.05) with abnormal pulmonary function estimations in patients with aortic valve disease.
Observational (n=17)
In patients with aortic valve disease, abnormal ventilation-perfusion relations correlate with radiographic evidence of pulmonary blood diversion, suggesting raised pulmonary venous pressure alters lung perfusion.
May support chest radiography for estimating pulmonary hemodynamics in aortic valve disease; hypothesis-generating and requires prospective validation.
Wasted ventilatory volume (V(D)) and its ratio to tidal volume (V(D)/V(T)) were measured at rest and during exertion in 17 patients with aortic valve disease. We considered V(D)/V(T) to indicate abnormal ventilation: perfusion relations if it did not decrease on exertion, or if the exercising value was greater than 40 per cent. Plain chest radiographs were independently examined for evidence of diversion of pulmonary blood to the upper lobes. There was significant agreement (p<0.05) between radiographic and pulmonary function estimations of abnormality. This suggests that the raised pulmonary venous pressure associated with left ventricular failure creates an abnormal pattern of blood flow through the lung, which is responsible for causing inadequate perfusion with respect to ventilation.
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Goodenday et al. (1970) conducted an observational in aortic valve disease (n=17). Chest radiograph and pulmonary function assessment was evaluated on Agreement between radiographic and pulmonary function estimations of abnormality (p=<0.05). Radiographic evidence of pulmonary blood diversion to the upper lobes showed significant agreement (p<0.05) with abnormal pulmonary function estimations in patients with aortic valve disease.
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