hydrocortisone + norepinephrine

Hydrocortisone + norepinephrine is a combination therapy used primarily in the management of septic shock and other forms of vasodilatory shock. Hydrocortisone is a synthetic glucocorticoid that exerts anti-inflammatory and immunosuppressive effects by binding to the glucocorticoid receptor, inhibiting phospholipase A2, NF-kappa B, and other inflammatory transcription factors, while promoting anti-inflammatory gene expression. Norepinephrine (noradrenaline) is an endogenous catecholamine that acts as a potent vasopressor by stimulating alpha-1 and alpha-2 adrenergic receptors to induce vasoconstriction, thereby increasing systemic vascular resistance and blood pressure. The combination has been shown to improve hemodynamic stability in patients with septic shock who require escalating doses of norepinephrine; addition of hydrocortisone can reduce 28-day mortality, improve resolution of shock, increase hemodynamic responsiveness, decrease recurrence of shock within 72 hours, shorten ICU/hospital stay, and increase ventilator-free days. Mechanistically, hydrocortisone may also potentiate the vascular response to catecholamines like norepinephrine by inhibiting catechol-O-methyl transferase (COMT), reducing breakdown of these agents.