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In Hypertension, Global Endothelial Calcium Underlies a Protective Mechanism that Limits Arterial Vasoconstriction.

In small arteries, increased vascular reactivity contributes to the raised blood pressure that characterizes established hypertension. Endothelial function is altered in hypertension and may confer protection against the increased vascular reactivity but the precise mechanisms involved are unresolved. Here, in isolated small mesenteric arteries from hypertensive SHR (arterial BP, 190 ± 4 mmHg) and age‐matched normotensive WKY (arterial BP, 120 ± 4 mmHg) rats, the mechanisms of altered endothelial function were examined using simultaneous measurement of arterial contraction and endothelial Ca2+ signalling in large fields (~2000) of cells.