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Pulmonary Vascular Disease |

Pulmonary Artery Diameter on Thoracic CT Scan and Its Relationship to Pulmonary Artery Pressure

Mohammad Khalid*, MD; Sarfraz Saleemi, MD; Abdullah AlDalaan, MD; Mohammad Zeitouni, MD; Abdullah Mobeireek, MD; Maher Bazarbashi, MD
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King Faisal Specialist Hospital & Research Center, Riyadh, Saudi Arabia


Chest. 2012;142(4_MeetingAbstracts):823A. doi:10.1378/chest.1382247
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Abstract

SESSION TYPE: DVT/PE/Pulmonary Hypertension Posters I

PRESENTED ON: Wednesday, October 24, 2012 at 01:30 PM - 02:30 PM

PURPOSE: To assess the relationship between the degrees of pulmonary artery pressure (PAP) measured by Doppler echocardiography (DE) and pulmonary artery diameter (PAD) and its ratio to ascending aorta (PA/AO) on thoracic CT scan

METHODS: Forty eight patients with diagnosis of pulmonary hypertension diagnosed on Doppler echocardiography who had contrasted CT scan of chest were included in the study. The patients were grouped into mild, moderated and severe pulmonary hypertension based on the degree of pulmonary artery pressure. Diameter of main pulmonary artery on contrasted thoracic CT scan just above the bifurcation and its ratio to the diameter of ascending aorta at the same level was measured. Statistical analysis was made to determine the relationship between the degree of PAP and measurements of PAD and PA/AO ratio.

RESULTS: Mean systolic PAP was 86(±32) mmHg while mean PA diameter was 36(±4) mm and mean PA/AO ratio 1.35(±0.2). All study subjects regardless of degree of pulmonary hypertension had PA diameter ≥ 29 mm (upper limit of normal) and PA/AO ratio >1.0. There was poor correlation between degree of PA pressure and PA diameter (R2 = 0.05) or degree of PA pressure and PA/AO ratio (R2 = 0.16) in study group. The correlation between PAD and PAP or PA/AO .ratio was also weak when calculated for mild, moderate and severe PH groups.

CONCLUSIONS: Although increased PAD and PA/AO ratio on contrasted thoracic CT scan is a strong indicator of pulmonary hypertension, there is no correlation between the severity of PAP measured by Doppler echocardiography and PAD or PA /AO ratio.

CLINICAL IMPLICATIONS: Pulmonary artery diameter on thoracic CT scan is not reliable to assess the severity of pulmonary hypertension. Other methods such as Doppler Echocardiography and Right Heart Catheterization should be used to measure the degree of pulmonary artery pressure.

DISCLOSURE: The following authors have nothing to disclose: Mohammad Khalid, Sarfraz Saleemi, Abdullah AlDalaan, Mohammad Zeitouni, Abdullah Mobeireek, Maher Bazarbashi

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King Faisal Specialist Hospital & Research Center, Riyadh, Saudi Arabia

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