Created by nurses, for nurses. Hello everybody and welcome to the NRSNG channel. Today, we re going to talk about beta blockers. We re gonna talk about what beta blockers are, why they re given and some of the side effects and nursing considerations when giving beta blockers. Okay. So, if you want to download this presentation, and view a special handout about beta blockers, you can go to NRSNG /BETA. What we ll have on there is, we ll have some of the handouts.
From this presentation specifically discussing what are beta blockers, why they re given and you can have that in a PDF file that you can download free. So, go ahead and go to NRSNG /BETA and you ll be able to get that. Okay, when talking about beta blockers, first and foremost, what we need to talk about is we need to talk about the sympathetic nervous system. Okay, so we need to understand what exactly is being blocked. Right? Alright. So, with beta blockers, so, there s sympathetic.
Nervous system, what we have here is we have several different actual receptor sites. so, with our sympathetic, there we go, sympathetic nervous system or the SNS, what we re basically talking about is our fight or flight system, okay? So, the sympathetic nervous system is the fight or flight response. And what we have is we have several receptor sites in various locations throughout the body that respond adrenaline and noradrenaline, and when they are stimulated by adrenaline and noradrenaline, they have this fight or flight.
Response. okay, so that is our sympathetic nervous system, sns or fight or flight system. So, what we have here, is we have alpha receptors, there are couples of those alpha 1, alpha 2. We also have beta receptors, Beta 1, 2, and 3, we re not gonna talk about 3 at all. And then we also have dopaminergic receptors. So, what happens is, when there is a stimulus, you know when a lion jumping out at you, a test coming up, cute girl, cute boy, whatever, what happens is, this SNS would be stimulated and you ll have that fight or flight response.
And, that s going to stimulate alpha 1, alpha 2, beta 1, beta 2 receptors. okay? so, that s what s gonna happen there. So, specifically, we need to talk about what are beta receptors, okay? So, beta receptors. We have beta receptors, right? Okay. Okay, so we have beta 1 and we have beta 2. Okay, so our beta 1 receptors are found primarily in our heart. Okay, so we have these beta 1 receptors, and what they do is they are basically in charge of heart rate, contractility,.
And conduction of the heart. okay, so they re gonna act on sa node and av node and they re gonna affect heart rate, conduction and the contraction in the heart. So, that s our beta 1. The beta 2 receptors, on the other hand, are found primarily in the lungs. What they re gonna deal with this is, they re gonna deal with like a brochodilation. Okay, so, when the beta 1 receptors are stimulated, you re gonna see an increase heart rate, increased conduction and increased contractility. When beta 2 receptors are stimulated, you re gonna see bronchodilation. Okay? So, an easy way.
To remember this is beta 1, okay, you have one heart, beta 2, you have two lungs. okay, so, actions of the beta receptors include, now this is specific to the heart. Actions of beta 1 receptors in the heart, they re gonna increase cardiac output, they re gonna do that in a couple of ways. They re gonna do that by increasing heart rate in SA node, that is referred to as Chronotropic effect. So, chronotropic, chronological, think time, that s gonna increase heart rate. That s gonna increase atrial contractility, so contractility.
Is inotropic effect. with that, just remember that junction is a positive inotrope, so it s gonna increase that contractility. So, it s also gonna increase the conduction automaticity of the AV node and it s gonna increase conduction automaticity of ventricles. Okay. So, that s basically what beta blockers or beta receptors are. Okay, so, when we re talking about beta blockers, usually, we re referring to beta 1, that s what we re going to talk about today anyway, we re gonna talking about beta 1 receptor.