This study aims to evaluate the impact of different norepinephrine doses on the accuracy of the peripheral perfusion index in predicting tissue perfusion in septic shock patients. Primary outcome: * Correlation between peripheral perfusion index Secondary outcomes: * Peripheral perfusion index accuracy to predict the tissue perfusion . * Peripheral perfusion index accuracy to predict mortality.
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Correlation between Peripheral Perfusion Index and ( Central venous oxygen saturation , and lactate clearance).
Timeframe: Before initiation of vasopressor therapy, 5 minutes, 30 minutes, 1 hour, 2 hours, and 6 hours post-initiation of vasopressor therapy