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Aims  Angiotensin‐converting enzyme‐2 (ACE2) is the receptor for SARS‐CoV‐2. Animal studies suggest that renin–angiotensin–aldosterone system (RAAS) blockers might increase the expression of ACE2 and potentially increase the risk of SARS‐CoV‐2 infection.    Methods and Results  The effect of ACE inhibitor (ACEI) treatment on the pneumonia incidence in non‐COVID‐19 patients (25 studies, 330 780 patients) was associated with a 26% reduction of pneumonia risk (odds ratio [OR]: 0.74,  P  < .001). Pneumonia‐related death cases in ACEI‐treated non‐COVID‐19 patients were reduced by 27% (OR: 0.73,  P =  .004). However, angiotensin II receptor blockers (ARB) treatment (10 studies, 275 621 non‐COVID‐19 patients) did not alter pneumonia risk in patients. Pneumonia‐related death cases in ARB‐treated non‐COVID‐19 patients was analysed only in 1 study and was significantly reduced (OR, 0.47; 95% confidence interval, 0.30 to 0.72). Results from 11 studies (8.4 million patients) showed that the risk of getting infected with the SARS‐CoV‐2 virus was reduced by 13% (OR: 0.87,  P =  .014) in patients treated with ACEI, whereas analysis from 10 studies (8.4 million patients) treated with ARBs showed no effect (OR, 0.92,  P =  .354). Results from 34 studies in 67 644 COVID‐19 patients showed that RAAS blockade reduces all‐cause mortality by 24% (OR = 0.76,  P =  .04).    Conclusion  ACEIs reduce the risk of getting infected with the SARS‐CoV‐2 virus. Blocking the RAAS may decrease all‐cause mortality in COVID‐19 patients. ACEIs also reduce the risk of non‐COVID pneumonia. All‐cause mortality due to non‐COVID pneumonia is reduced by ACEI and potentially by ARBs.

british journal of clinical pharmacology

Comparison of infection risks and clinical outcomes in patients with and without SARS‐CoV‐2 lung infection under renin–angiotensin–aldosterone system blockade: Systematic review and meta‐analysis