Final answer:
Inhaled anesthetics like isoflurane, sevoflurane, desflurane, and halothane generally decrease systemic vascular resistance (SVR) by inducing vasodilation.
Step-by-step explanation:
The effect of inhaled anesthetics such as isoflurane (iso), sevoflurane (sevo), desflurane (des), and halothane (halo) on systemic vascular resistance (SVR) is generally to decrease SVR. These agents induce vasodilation, which leads to a decrease in the resistance offered by systemic blood vessels. Therefore, the use of these inhaled anesthetics typically results in a slight to significant decrease in systemic vascular resistance depending on the agent and dose used, thereby potentially lowering the blood pressure during anesthesia.