**Clinical Reasoning : Hypercholesterolemia | Osmosis โ€” Transcript & Summary | SozAI** Source: https://sozai.app/transcript/clinical-reasoning-hypercholesterolemia-osmosis/ Overview of hypercholesterolemia, cholesterol types, diagnosis, risk factors, and treatment options including lifestyle changes and medications. ## Key Takeaways - LDL cholesterol is the most important indicator of cardiovascular risk. - Lifestyle changes are essential but often insufficient alone for high LDL levels. - Statins are the first-line pharmacological treatment for hypercholesterolemia. - Additional medications are available for statin intolerance or insufficient LDL reduction. - Severe familial hypercholesterolemia may require specialized treatments like LDL apheresis. ## What the video covers - Cholesterol is essential for cell membranes and hormone synthesis, mostly recycled via bile acids in the intestines. - LDL (low-density lipoprotein) is often called bad cholesterol because high levels contribute to atherosclerosis; HDL (high-density lipoprotein) is considered good cholesterol as it helps remove cholesterol from tissues. - Hypercholesterolemia diagnosis involves measuring total cholesterol, LDL, HDL, and triglycerides, with specific thresholds indicating risk. - Lifestyle modifications such as exercise, weight loss, smoking cessation, and reducing saturated fat intake are first-line interventions. - Lipid-lowering medications are prescribed based on LDL levels and cardiovascular risk factors, with statins as the primary treatment. - Statins lower LDL and triglycerides while raising HDL; doses vary based on patient history and LDL response. - Other medications include ezetimibe, fibrates, bile acid sequestrants, and niacin, each with specific mechanisms and side effects. - Familial hypercholesterolemia may require advanced treatments like LDL apheresis for severe cases. - Regular cholesterol testing is recommended every 5 years for adults over 20 to monitor cardiovascular risk. - Managing LDL is critical to preventing cardiovascular events such as heart attacks and strokes. Answers ## Questions about this video What is the difference between LDL and HDL cholesterol? LDL cholesterol carries cholesterol to peripheral tissues and can contribute to plaque formation in arteries, increasing cardiovascular risk. HDL cholesterol helps remove cholesterol from tissues and transports it back to the liver, which can help reduce atherosclerosis. When should someone start cholesterol testing? It is recommended that adults aged 20 or older have their cholesterol levels tested every 5 years to monitor risk for cardiovascular disease. What are the main treatment options for hypercholesterolemia? Treatment includes lifestyle modifications such as diet and exercise, and lipid-lowering medications like statins, ezetimibe, fibrates, bile acid sequestrants, and niacin, depending on LDL levels and cardiovascular risk. ## Full Transcript โ€” Download SRT & Markdown 00:04 Speaker A Cholesterol is a lipid molecule that helps maintain the structure of cell membranes and is a precursor to steroid hormones, bile acids, and vitamin D. Although every day some new cholesterol comes in through the diet, most of the cholesterol we need is obtained through recycling existing cholesterol. Most of that recycling happens in the intestines and is facilitated by bile acids, which help us reabsorb LDL cholesterol and bring it back into the bloodstream. There are two main types of cholesterol: HDL or high-density lipoprotein, which is sometimes called good cholesterol, and LDL or low-density lipoprotein, which is sometimes called bad cholesterol. But good and bad is overly simplistic, and like all things, the subtleties matter. LDL is produced by the liver, and it carries cholesterol out to the rest of the body. If all of the cholesterol from LDL is not completely distributed to the peripheral cells, then HDL brings some of that cholesterol back from the peripheral tissues and sends it to the liver. Now, what makes LDL bad and HDL good is that whenever there's a high blood concentration of LDL, LDL can be ingested by macrophages that sit along vessel walls, forming atherosclerotic plaques. Over decades, large atherosclerotic plaques can lead to myocardial infarctions, strokes, and peripheral vascular disease. That's why we want to keep LDL blood levels under control. On the other hand, HDL can remove cholesterol from cells, and that can help reverse the process of atherosclerosis. A diagnosis of hypercholesterolemia requires measuring total cholesterol, LDL cholesterol, HDL cholesterol, and triglycerides. Cholesterol is measured either as mg per deciliter or millimoles per liter of blood, and it's recommended to test cholesterol every 5 years for people age 20 or older. Hypercholesterolemia is defined as having cholesterol levels that predict a higher risk of atherosclerosis and cardiovascular disease. The total blood cholesterol is, get this, the total amount of cholesterol in your blood, and it includes the LDL, HDL, and VLDL, and it should be below 200 mg per deciliter or 5.2 millimoles per liter. The HDL level should be above 60 mg per deciliter or 1.55 millimoles per liter, and the LDL level should be below 100 to 130 mg per deciliter or 3.3 millimoles per liter in most individuals, or below 70 mg per deciliter or 1.8 millimoles per liter in people who have previously had a cardiovascular event. And of the three, total cholesterol, LDL, and HDL, the LDL is the most relevant indicator of risk. Finally, triglycerides are also often measured along with cholesterol because elevated triglycerides can contribute to atherosclerosis, and having elevated triglycerides is specifically termed hypertriglyceridemia rather than hypercholesterolemia. Now, first off, individuals with hypercholesterolemia should make lifestyle modifications such as exercise and weight loss to achieve a healthy BMI between 18.5 and 25, avoid cigarettes and tobacco products, and reduce consumption of saturated fats, so eating fewer animal products like meat and dairy. Usually, individuals with a very elevated LDL or with a combination of moderately elevated LDL and other risk factors for cardiovascular disease are prescribed lipid-lowering medications. Common risk factors for cardiovascular disease include being a man over the age of 45 or a woman over the age of 50 with HDL cholesterol less than 40 mg per deciliter or 1 millimole per liter, having diabetes, hypertension, a family history of coronary artery disease and hypercholesterolemia, and cigarette smoking. To be more specific, individuals with an LDL above 190 mg per deciliter or 4.9 millimoles per liter, or those with an LDL above 160 mg per deciliter or 4.1 millimoles per liter with two or more additional risk factors, are started on medication. Treatment is also started in individuals with an LDL above 130 mg per deciliter or 3.4 millimoles per liter with asymptomatic coronary artery disease, as well as individuals above 70 mg per deciliter or 1.8 millimoles per liter who have previously had a cardiovascular event. There are five main classes of lipid-lowering medications: statins, selective cholesterol absorption inhibitors like ezetimibe, fibrates, bile acid sequestrants, and niacin. The first option are statins, and they're generally the first choice in most situations. They lower LDL and triglycerides and raise the HDL. In patients that have never had a cardiovascular event, a low to moderate dose of a statin is used, like 10 to 20 mg of atorvastatin or 5 to 10 mg of rosuvastatin. LDL is usually measured 6 weeks after starting statin therapy to see if there's a response and then done every 6 to 12 months thereafter. The goal is to get the LDL below 100 mg per deciliter or 2.6 millimoles per liter. If the LDL remains above that level, then one option is to gradually increase the statin dose up to 40 to 80 mg of atorvastatin or 20 to 40 mg of rosuvastatin. On the other hand, for patients with a previous cardiovascular event, lifelong high-dose statin therapy with 40 to 80 milligrams of atorvastatin or 20 to 40 mg of rosuvastatin is used regardless of baseline LDL levels. Now, even at maximum doses of statins, some individuals still can't reach their LDL goal, so that's where it may be helpful to add on another lipid-lowering medication, and the choice is mainly based on the potential side effects of each medication. In addition, statins can cause side effects like muscle pain and myopathy, increased risk of diabetes mellitus, and elevated transaminases like an ALT. So if statin therapy isn't well tolerated, then that's another reason to try a different lipid-lowering medication. Next up, there's selective cholesterol absorption inhibitors like ezetimibe, which lower LDL by preventing cholesterol absorption in the intestine. So their main side effect is diarrhea. Ezetimibe is recommended as second-line therapy for those intolerant of statins or as an add-on therapy to statins for those unable to achieve the LDL goal on statins alone. After statins and ezetimibe, if more add-on therapy is needed or if those two aren't well tolerated, then there are a few other options. One is fibrates. They increase HDL levels and also lower triglycerides. Fibrates also decrease LDL, though generally to a lesser degree than statins, so that's why they're typically used in combination with statins or ezetimibe if they aren't effective at reaching their LDL goal by themselves. However, similar to statins, fibrates also cause myopathy and elevated transaminases, so if those are a concern, then it's better to choose another different lipid-lowering medication. The next option would be bile acid sequestrants like cholestyramine, which lower LDL by preventing cholesterol absorption in the intestine as well, and again, the main side effect is diarrhea. Bile acid sequestrants are sometimes preferred because they don't cause myopathy. Finally, there's niacin, which lowers LDL levels and increases HDL levels and is sometimes used in addition to another lipid-lowering medication as a last resort. However, research hasn't shown that adding niacin further lowers the risk of heart disease, so it may not continue to get recommended for hypercholesterolemia in the coming years. The main side effect of niacin is facial flushing, which can be blocked by taking 300 mg of aspirin half an hour before taking niacin. Some people, including some young individuals, have familial hypercholesterolemia and then develop severe hypercholesterolemia. They're often unable to lower their LDL levels with diet and commonly use lipid-lowering medications, so they sometimes need LDL apheresis, which is where a person's blood is passed through an apparatus that filters out LDL and returns the remainder of the blood to the circulation. The procedure takes 2 to 4 hours and must be repeated regularly every few weeks. Another option for individuals who can't do regular LDL apheresis is liver transplantation. A new liver has the functional hepatic LDL receptors that are often absent in familial hypercholesterolemia. Finally, there are some individuals who can't achieve an LDL below 160 mg per deciliter or 4.10 millimoles per liter even with th 00:21 Speaker A recycling existing cholesterol most of that recycling happens in the intestines and is facilitated by bile acids which help us reabsorb ABB cholesterol and bring it back into the bloodstream there are two main types of cholesterol HDL or high density 00:40 Speaker A lipoprotein which is sometimes called good cholesterol and LDL or low density lipoprotein which is sometimes called bad cholesterol but good and bad is overly simplistic and like all things the subtleties matter LDL is produced by the liver and it carries cholesterol out to 00:59 Speaker A the rest of the body if all of the cholesterol from LDL is not completely distributed to the peripheral cells then HDL brings some of that cholestrol back from the peripheral tissues and sends it to the liver now what makes LDL bad and HDL 01:15 Speaker A good is that whenever there's a high blood concentration of LDL LDL can be ingested by macroasia that sit along vessel walls forming atherosclerotic plaques over decades large atherosclerotic plaques can leave to myocardial infarctions strokes and peripheral vascular disease that's why 01:36 Speaker A we want to keep LDL blood levels under control on the other hand HDL can remove cholesterol from cells and that can help reverse the process of atherosclerosis a diagnosis of hyper cholesterolemia requires measuring total cholesterol LDL cholesterol HDL 01:54 Speaker A cholesterol and triglycerides cholesterol is measured either as Mig per deciliter or milles per liter of blood and it's recommended to test cholesterol every 5 years for people age 20 or older hyper cholesterolemia is defined as having cholesterol levels that 02:14 Speaker A predict a higher risk of atherosclerosis and cardiovascular disease the total blood cholesterol is get this the total amount of cholesterol in your blood and it includes the LDL HDL and vldl and it should be below 200 MGS per deciliter or 5.2 milles per 02:35 Speaker A liter the HDL level should be above 60 mg per decil or 1.55 millimes per liter and the LDL level should be below 10030 mg per dcil or 3.3 mes per liter in most individuals or below 70 mg per decil or 02:54 Speaker A 1.8 milles per liter in people who have previously had a cardiovascular event and of the three total cholesterol LDL and HDL the LDL is the most relevant indicator of risk finally triglycerides are also often measured along with cholesterol 03:12 Speaker A because elevated triglycerides can contribute to atherosclerosis and having elevated triglycerides is specifically termed hypertriglyceridemia rather than hyper cholesterolemia now first off individ jeels with Hyper cholesterolemia should make lifestyle modifications such as exercise and weight loss to achieve a 03:36 Speaker A healthy BMI between 18.5 and 25 avoid cigarettes and tobacco products and reduce consumption of saturated fats so eating fewer animal products like meat and dairy usually individuals with a very elevated LDL or with a combination of moderately elevated LDL and other risk 03:59 Speaker A factors for for cardiovascular disease are prescribed lipid lowering medications common risk factors for cardiovascular disease include being a man over the age of 45 or a woman over the age of 50 with HDL cholesterol less than 40 Mig per de or 1 Millo per liter 04:19 Speaker A having diabetes hypertension a family history of coronary artery disease in hyper cholesterolemia and cigarette smoking to be more specific individuals with an LDL above 190 mg per decil or 4.9 Mill per liter or those with an LDL above 160 mg per deciliter or 4.1 m per 04:41 Speaker A liter with two or more additional risk factors are started on medication treatment is also started in individuals with an LDL above 130 mg per deciliter or 3.4 milles per liter with asymptomatic coronary artery disease as well as individuals above 70 mg per de 05:00 Speaker A or 1.8 m per liter who have previously had a cardiovascular event there are five main classes of lipid lowering medications statins selective cholesterol absorption Inhibitors like a zmb fibrates bile acid sequestrants and nasin the first option are statins and 05:24 Speaker A they're generally the first choice in most situations they lower LDL and triglycerides and L rais the HDL in patients that have never had a cardiovascular event a low to moderate dose of a Statin is used like 10 to 20 05:39 Speaker A mg of atorvastatin or 5 to 10 mg of Rua Statin LDL is usually measured 6 weeks after starting Statin therapy to see if there's a response and then done every 6 to 12 months thereafter the goal is to get the LDL 05:56 Speaker A below 100 mg per decil or 2.6 m per liter if the LDL remains above that level then one option is to gradually increase the Statin dose up to 40 to 80 Mig of atorvastatin or 20 to 40 Mig of 06:14 Speaker A rosuvastatin on the other hand for patients with a previous cardiovascular event lifelong highd does statin therapy with 40 to 80 milligram of atorvastatin or 20 to 40 Mig of rosuvastatin is used regardless of Baseline LDL levels now even at maximum doses of 06:31 Speaker A statins some individuals still can't reach their LDL goal so that's where it may be helpful to add on another lipid lowering medication and the choice is mainly based on the potential side effects of each medication in addition statins can cause 06:47 Speaker A side effects like muscle pain and myopathy increased risk of diabetes meletus and elevated transaminases like and ALT so if Statin therapy isn't well tolerated then that's another reason to try a different lipid lowering medication next up there's selective 07:08 Speaker A cholesterol absorption Inhibitors like aetam which lower LDL by preventing cholesterol absorption in the intestine so their main side effect is diarrhea aetam is recommended as second line therapy for those intolerant of statins or as an add-on therapy to 07:26 Speaker A statins for those unable to achieve the LDL goal on St St alone after statins and a Zam if more add-on therapy is needed or if those two aren't well tolerated then there are a few other options one is fibrates they 07:43 Speaker A increase HDL levels and also lower triglycerides fibrates also decrease LDL though generally to a lesser degree than statins so that's why they're typically used in combination with statens or a zib if they aren't effective at reaching their LDL goal by themselves however 07:59 Speaker A similar to statins fibrates also cause myopathy and elevated transaminases so if those are a concern then it's better to choose another different lipid lowering medication the next option would be bile acid sequestrant like cholestyramine which lower LDL by preventing 08:19 Speaker A cholesterol absorption in the intestine as well and again the main side effect is diarrhea bile acid sequestrant are sometimes preferred because they don't cause myopathy finally there's nasin which lowers LDL levels and increases HDL levels and is sometimes used in addition 08:41 Speaker A to another lipid lowering medication as a last resort however research hasn't shown that adding nasin further lowers the risk of heart disease so it may not continue to get recommended for hypocholesterolemia in the coming years the main side effect of niin is 08:58 Speaker A facial flushing which can be blocked by taking 300 mg of aspirin half an hour before taking niin some people including some young individuals have familial hyper cholesterolemia and then develop severe hypercholesterol emia they're often unable to lower their LDL levels with 09:19 Speaker A diet and commonly use lipid lowering medications so they sometimes need LDL apheresis which is where a person's blood is passed through an apparat that filters out LDL and Returns the remainder of the blood to the circulation the procedure takes 2 to 4 09:36 Speaker A hours and must be repeated regularly every few weeks another option for individuals who can't do regular LDL apheresis is liver transplantation a new liver has the functional hepatic LDL receptors that are often absent in familial hyper cholesterolemia finally there are some 09:57 Speaker A individuals who can't achieve an LDL below 160 mg per dcil or 4.10 Mill per liter even with the commonly used lipid lowering medications LDL apheresis and aren't candidates for liver transplantation in these situations there are two novel lipid lowering 10:15 Speaker A agents called LPI or mipomersen which may be tried these medications are given as last resort due to cost and risk of hepatotoxicity all right as a quick recap the total blood cholesterol level should be below 200 mg per decil or 5.2 10:34 Speaker A Mill per liter the HDL level should be above 60 mg per dcil or 1.55 m per liter and the LDL level should be below 130 mg per decil or 3.3 Mill per liter or below 70 mg per decil or 1.8 Mill per liter in 10:54 Speaker A individuals who have previously had a cardiovascular event statins are generally the first and best choice given to most individuals Zam is recommended as second line therapy for those intolerant of statins or unable to achieve Target LDL levels on statins alone fibrates are 11:13 Speaker A generally used as accessory therapy in combination with statins if a zamid fails bile acid sequestrant are occasionally used as an adjunct to the statins as an alternative to the fibrates to avoid the additional risk of myopathy finally niin is sometimes used in 11:32 Speaker A addition to another lipid lowering medication individuals that are unable to lower their LDL levels with diet and establish lipid lower therapy may get LDL apheresis liver transplantation or treatment with two novel lipid lowering agents called lopi or mipomersen Topics: hypercholesterolemia cholesterol LDL HDL statins atherosclerosis cardiovascular disease lipid-lowering medications familial 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