MP03-14: Effect of ethnicity on stone composition and outcomes in New Zealand: A retrospective analysis of Percutaneous Nephrolithotomy at Auckland Hospital.
Friday, May 15, 2020
7:00 AM – 9:00 AM
Jessica Hunter, Eden Park, Zulfadhly Zainal Bahren, Nadya York
Introduction: New Zealand is an ethnically diverse country with a large number of Maori and Pacific Islanders (PI). Inferior health outcomes for Maori and PI continue to persist. Our objective was to assess impact of ethnicity on percutaneous nephrolithotomy (PCNL) rates, stone composition and clearance at New Zealand’s highest volume stone centre.
Methods: A retrospective analysis of all patients who underwent PCNL from January 2013 to May 2017 at Auckland Hospital was performed. PCNL rates and stone analysis were reviewed and grouped by ethnicity. Stone clearance by primary stone type was assessed.
Results: A total of 247 patients underwent PCNL during study period. The ethnicity data is summarised in table 1. NZ Europeans are under-represented and PI over-represented compared to census data. The predominant stone type was grouped by ethnicity (Graph 1). European and Asian patients were more likely to develop calcium oxalate stones, whereas Maori and PI patients were more likely to form struvite stones. Complete clearance rate for each stone type (assessed by x-ray, CT, or intra-operatively) is summarised in Table 2.
Conclusions: We found over-representation of Maori and PI patients with large stones requiring PCNL. These patients were more likely to develop struvite stones, further complicated by lower clearance rates. Further efforts toward reducing burden of recurrent kidney stone disease for Maori and PI are warranted. Source of
