TY - JOUR

T1 - Prognostic impact of ventilation-perfusion defects and pulmonary diffusing capacity after single lung transplantation

AU - Mohammad, Milan

AU - Kristensen, Anna Warncke

AU - Hedsund, Caroline

AU - Greve, Anders M.

AU - Perch, Michael

AU - Mortensen, Jann

AU - Berg, Ronan M.G.

PY - 2021

Y1 - 2021

N2 - Background: Ventilation-perfusion (VQ) scintigraphy and lung function testing are often used to assess allograft function after single lung transplantation (SLTX). However, it is unknown whether allograft defects on VQ scintigraphy presage all-cause mortality after SLTX. Objective: To investigate whether allograft defects on VQ scintigraphy portend poorer lung function and increased mortality after SLTX. Methods: We retrospectively identified 45 consecutive patients in which a VQ scintigraphy was performed as part of the routine workup 12 weeks after SLTX. VQ scintigraphies were scored for matched and mismatched perfusion defects in the allograft. Lung function testing was performed according to established guidelines six months after SLTX. Time to all-cause mortality was the endpoint. Results: 19 (42%) patients had matched VQ defects. After a median follow-up of 4.1 (IQR 1.5–7.9) years since SLTX, 35 (78%) had died. Those with matched defects in the allograft had lower diffusing capacity (mean 42 [SD 14] versus mean 54 [SD 18] % of predicted, p <.05) and increased mortality (univariable HR 2.06, 95% CI: 1.05–4.06, p =.04). However, in multivariate analysis, only lower post-transplantation diffusing capacity remained associated with mortality (HR 1.08, 95% CI: 1.02–1.30 per % lower diffusing capacity of predicted, p =.003). Conclusion: In SLTX patients, a lower diffusing capacity appeared to explain the increased mortality among those with matched VQ defects in the allograft.

AB - Background: Ventilation-perfusion (VQ) scintigraphy and lung function testing are often used to assess allograft function after single lung transplantation (SLTX). However, it is unknown whether allograft defects on VQ scintigraphy presage all-cause mortality after SLTX. Objective: To investigate whether allograft defects on VQ scintigraphy portend poorer lung function and increased mortality after SLTX. Methods: We retrospectively identified 45 consecutive patients in which a VQ scintigraphy was performed as part of the routine workup 12 weeks after SLTX. VQ scintigraphies were scored for matched and mismatched perfusion defects in the allograft. Lung function testing was performed according to established guidelines six months after SLTX. Time to all-cause mortality was the endpoint. Results: 19 (42%) patients had matched VQ defects. After a median follow-up of 4.1 (IQR 1.5–7.9) years since SLTX, 35 (78%) had died. Those with matched defects in the allograft had lower diffusing capacity (mean 42 [SD 14] versus mean 54 [SD 18] % of predicted, p <.05) and increased mortality (univariable HR 2.06, 95% CI: 1.05–4.06, p =.04). However, in multivariate analysis, only lower post-transplantation diffusing capacity remained associated with mortality (HR 1.08, 95% CI: 1.02–1.30 per % lower diffusing capacity of predicted, p =.003). Conclusion: In SLTX patients, a lower diffusing capacity appeared to explain the increased mortality among those with matched VQ defects in the allograft.

KW - allograft failure

KW - chronic obstructive pulmonary disease

KW - single lung transplantation

U2 - 10.1111/cpf.12676

DO - 10.1111/cpf.12676

M3 - Journal article

C2 - 33155400

AN - SCOPUS:85096677133

VL - 41

SP - 221

EP - 225

JO - Clinical Physiology and Functional Imaging

JF - Clinical Physiology and Functional Imaging

SN - 1475-0961

IS - 2

ER -