Alkaline phosphatase, but not serum phosphate, associated with increased CV risk
Alkaline Phosphatase, Serum Phosphate, and Incident Cardiovascular Disease and Total Mortality in Older Men.
Wannamethee SG, Sattar N, Papcosta O et al
Arterioscler Thromb Vasc Biol. 2013 Feb 21.
End-stage renal disease often comes with altered mineral metabolism such as changes in alkaline phosphatase (ALP) and circulating phosphate concentrations [1-3]. Several studies have linked elevated circulating phosphate levels and serum ALP levels to increased coronary calcification and cardiovascular risk in persons with chronic kidney disease [1-4]. Also for the general population serum phosphate has been described to be associated with increased risk of cardiovascular disease (CVD) [5-9]. However, some studies did not find an association between phosphate and coronary heart disease (CHD) events in the general population [7,8,10]. Population studies that looked at ALP and CVD, found a that increased levels are associated with increased CVD mortality and hospitalization [11-13]. ALP is associated with a marker of inflammation , but the role of inflammation in the relationship between ALP and CVD is unclear.
This prospective study investigated the association between serum phosphatase and ALP with CHD risk, stroke, CVD mortality and total mortality, in 3381 men aged 60 to 79 year, without a history of myocardial infarction or stroke.
High ALP was significantly associated with increased risk of major CHD events and CVD events and CVD mortality, which could partly be explained by CV risk factors and inflammation.
Serum phosphatise was only significantly associated with CVD mortality not due to CHD or stroke (HR:1.35 [1.01, 1.83]; P=0.04), but showed no associations with CHD or stroke risks.
ALP and serum phosphate were both associated with increased total mortality, even after adjustment for inflammation and exclusion of men with chronic kidney disease.
This study confirms some earlier findings on the associations of ALP and phosphate with CHD/CVD events and total mortality, and extends these findings to older men without CVD. The authors discuss the potential contribution of inflammation, but further research is needed to elucidate the nature of the association between ALP and phosphate with CHD and CVD outcomes.
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We have examined the association between serum phosphate and alkaline phosphatase (ALP) with incident cardiovascular disease (CVD) outcomes and total mortality in older men.
Approach and Results
A prospective study of 3381 men, aged 60 to 79 years, without a history of myocardial infarction or stroke followed up for an average 11 years during which there were 605 major CVD events (fatal coronary heart disease and nonfatal myocardial infarction, stroke, and CVD death) and 984 total deaths. ALP but not serum phosphate was associated with increased risk of coronary heart disease and overall CVD events which persisted after adjustment for CVD risk factors and markers of inflammation and after exclusion of men with chronic kidney disease (adjusted hazard ratio per SD, 1.19 [1.05, 1.34]; P=0.007 and 1.10 [1.01, 1.21]; P=0.04). In contrast, serum phosphate was only associated with increased CVD mortality owing to noncoronary heart disease or stroke causes (adjusted hazard ratio per SD, 1.35 [1.01, 1.83]; P=0.04). Both raised phosphate and ALP were associated with significantly increased total mortality after full adjustment and exclusion of men with chronic kidney disease.
ALP but not serum phosphate is associated with coronary heart disease risk in elderly men. High levels of ALP and serum phosphate are both associated with increased total mortality.