Post spinal hypotension is a common and potentially serious complication in patients undergoing elective caesarean delivery under spinal anaesthesia. It can lead to significant maternal and fetal morbidity if not effectively managed. Traditionally, vasopressors such as phenylephrine and norepinephrine are utilized to mitigate this issue due to their vasoconstrictive properties, which help maintain blood pressure. However, the optimal choice of vasopressor remains a subject of ongoing debate. 

Phenylephrine, a selective alpha-1 adrenergic receptor agonist, is widely used and well-documented for its efficacy in maintaining hemodynamic stability during spinal anaesthesia. Nevertheless, it is associated with reflex bradycardia and decreased cardiac output, which can be detrimental in some cases. On the other hand, norepinephrine, which acts on both alpha and beta-adrenergic receptors, has gained attention for its potential to provide more balanced hemodynamic support with less impact on heart rate and cardiac output.

This double-blind randomized controlled study aims to compare the efficacy and safety of nebulised phenylephrine versus nebulised norepinephrine in preventing post spinal hypotension in patients undergoing elective caesarean delivery. By evaluating the hemodynamic profiles, maternal and fetal outcomes, and potential side effects of these two vasopressors, this study seeks to provide evidence-based guidance for optimizing maternal care during caesarean sections