Excessive doses of beta 2 agonists can lead to effects similar to which of the following?

Excessive doses of beta-2 agonists, which are often used as bronchodilators in the management of respiratory conditions like asthma or COPD, can stimulate not only the bronchial smooth muscle but also the cardiovascular system. This stimulation can lead to an increased heart rate, a condition known as tachycardia, as well as hypertension, which is an elevation of blood pressure.

The mechanism behind this is that beta-2 receptors, when overstimulated, can cause vasodilation in some blood vessels while also increasing cardiac output. Therefore, at high doses, the resultant effect can cause a significant increase in heart rate and blood pressure, which are indicative of a sympathetic nervous system response.

This understanding is crucial for healthcare professionals administering these medications, as it highlights the potential cardiovascular side effects that can arise from overuse.