Association between pulmonary function and renal function: findings from China and Australia.

Area of Science:

• Pulmonary Medicine
• Nephrology
• Epidemiology

Background:

• The link between obstructive lung function and kidney disease is not well understood.
• This study aimed to clarify the dose-response relationship between lung function and renal function.

Purpose of the Study:

• To investigate the association between obstructive lung function parameters and the risk of impaired renal function.
• To examine the dose-response relationship in Australian and Chinese populations.

Main Methods:

• Utilized data from two independent cross-sectional studies in Australia (n=1454) and China (n=5824).
• Measured pulmonary function (FEV1, FVC) and estimated glomerular filtration rate (eGFR).
• Defined impaired renal function as eGFR <60 mL/min/1.73m².

Main Results:

• Found a non-linear relationship between lung function (FEV1, FVC) and eGFR in both populations.
• Increased risk of impaired renal function was observed when FEV1 or FVC fell below 3.05 L.
• Risk also increased with predicted FEV1 below 76-77% and predicted FVC below 79-80%.

Conclusions:

• Obstructive lung function is associated with a higher risk of reduced kidney function.
• Screening for impaired renal function in patients with obstructive lung disease is advisable, especially before prescribing potentially nephrotoxic medications.