心Disease: Warning Signs of Cardiovascular Disease

Theheartis like any other muscle in the body. It needs an adequate blood supply to provide oxygen so that the muscle can contract and pump blood to the rest of the body. Not only does the heart pump blood to the rest of the body, but it also pumps blood to itself via the coronary arteries. These arteries originate from the base of theaorta(the major blood vessel that carries oxygenated blood from the heart) and then branch out along the surface of the heart.

When one or more coronary arteries narrow, it may make it difficult for adequate blood to reach the heart, especially duringexercise. This can cause the heart muscle to ache like any other muscle in the body. Should the arteries continue to narrow, it may take less activity tostressthe heart and provoke symptoms. The classic symptoms ofchest painor pressure andshortness of breath经常传播到肩膀,手臂,和/或neck due toatheroscleroticheart disease(ASHD) orcoronary artery disease(CAD) are called心绞痛.

Should one of the coronary arteries become completely blocked -- usually due to a plaque that ruptures and causes ablood clotto form -- blood supply to part of the heart may be lost. This causes a piece of the heart muscle to die. This is called aheart attackormyocardial infarction(myo=muscle + cardia=heart + infarction= tissue death).

心血管病, for this article, will be limited to describing the spectrum ofatherosclerosisorhardening of the arteriesthat ranges from a minimal blockage that may produce no symptoms to complete obstruction that presents as a myocardial infarction. Other topics, such asmyocarditis, heart valve problems, andcongenital heart defectswill not be covered.

心or cardiovascular disease is the leading cause of death in the United States and often can be attributed to lifestyle factors that increase the risk of atherosclerosis or narrowing of arteries.Smoking, along with poorly controlledhypertension(high blood pressure), anddiabetes, causes inflammation and irritation of the inner lining of the coronary arteries. Over time,cholesterolin the bloodstream can collect in the inflamed areas and begin the formation of plaque. This plaque can grow and as it does, the diameter of the artery narrows. If the artery narrows by 40% to 50%, blood flow is decreased enough to potentially cause the symptoms of心绞痛.

In some circumstances, the plaque can rupture or break open, leading to the formation of ablood clotin the coronary artery. This clot can completely occlude or block the artery. This prevents oxygen-rich blood from being delivered to the heart muscle beyond that blockage and that part of the heart muscle begins to die. This is a myocardial infarction or heart attack. If the situation is not recognized and treated quickly, the affected part of the muscle cannot be revived. It dies and is replaced byscartissue. Long term, this scar tissue decreases the heart's ability to pump effectively and efficiently and may lead to ischemiccardiomyopathy(ischemic=decreased blood supply + cardio=heart + myo=muscle + pathy=disease).

心muscle that lacks adequate blood supply also becomes irritable and may not conduct electrical impulses normally. This can lead to abnormal electrical heart rhythms including ventricular tachycardia and ventricularfibrillation. These are the heart arrhythmias associated withsudden cardiac death.

• The classic symptoms of angina, orpainfrom the heart, are described as a crushingpainor heaviness in the center of the chest withradiationof the pain to the arm (usually the left) or jaw. There can be associated shortness of breathsweatingandnausea.
• The symptoms tend to be brought on by activity and get better with rest.
• Some people may haveindigestionandnauseawhile others may have upper abdominal, shoulder, orback pain.
• Unstable angina is the term used to describe symptoms that occur at rest, waken the patient fromsleep, and do not respond quickly tonitroglycerinor rest.

Other heart (cardiovascular) disease symptoms and signs

Not all pain fromheart diseasehave the same signs and symptoms. The more we learn about heart disease, the more we realize that symptoms can be markedly different in different groups of people. Women, people who havediabetes, and the elderly may have different pain perceptions and may complain of overwhelmingfatigueandweaknessor a change in their ability to perform routine daily activities likewalking, climbing steps, or doing household chores. Some patients may have no discomfort at all.

最常见的心血管疾病的症状become worse over time, as the narrowing of the affected coronary artery progresses over time and blood flow to that part of the heart decreases. It may take less activity to cause symptoms to occur and it may take longer for those symptoms to get better with rest. This change inexercisetolerance is helpful in making the diagnosis.

Often the first signs andsymptoms of heart diseasemay be a heart attack. This can lead to crushing chest pressure, shortness of breath,sweating, and perhaps sudden cardiac death.

There are risk factors that increase the potential to develop plaque within coronary arteries and cause them to narrow. Atherosclerosis (athero=fatty plaque + sclerosis=hardening) is the term that describes this condition. Factors that put people at increased risk for heart disease are:

• Smoking
• High blood pressure(hypertension)
• High cholesterol
• Diabetes
• Family history of heart problems, especiallyheart attacksandstrokes
• Obesity

Since cardiovascular disease,peripheral artery disease, andstrokeshare the same risk factors, a patient who is diagnosed with one of the three has increased risk of having or developing the others.

The diagnosis of cardiovascular disease begins by taking the patient's history. The health-care professional needs to understand the patient's symptoms and this may be difficult. Often, health-care professionals ask aboutchest pain,但病人可能否认因为疼痛y perceive their symptoms as pressure or heaviness. Words also may have different meanings for different people. The patient may describe their discomfort as sharp, meaning intense, while the health-care professional may understand that term to mean stabbing. For that reason, it is important for the patient to be allowed to take the time to describe the symptoms in their own words and have the health-care professional try to clarify the terms being used.

The health-care professional may ask questions about the quality and quantity of pain, where it is located, and where it might travel or radiate. It is important to know about the associated symptoms including shortness of breath, sweating, nausea,vomiting, andindigestion, as well as malaise orfatigue.

The circumstances surrounding the symptoms are also important.

• Are the symptoms brought on by activity?
• Do they get better with rest?
• Since symptoms began, does less activity provoke onset of the symptoms?
• Do the symptoms wake the patient?

These are questions that may help decide wither the angina is stable, progressing, or becoming unstable.

• With stable angina, the activity that is required to initiate the symptoms does not fluctuate. For example, a patient may state that their symptoms are brought on by climbing up two flights of stairs or walking one mile.
• Progressive angina would find the patient stating that the symptoms are brought on by less activity than previously.
• In the case of unstable angina, symptoms may arise at rest or wake the patient fromsleep.

Risk factors for cardiovascular disease should be assessed including the presence ofhigh blood pressure, diabetes, high cholesterol,smokinghistory, and family history of cardiovascular disease. A past history ofstrokeor peripheral artery disease are also important risk factors to be assessed.

Physical examination may not necessarily help make the diagnosis of heart disease, but it can help decide whether other underlying medical problems may be the cause of the patient's symptoms.

有一些线索表明物理考试the presence of narrowed arteries to the heart and coronary artery disease, for example, they the doctor may:
Check forhigh blood pressure.
Palpate. (feel) for the pulses in the wrists andfeetto see if they are present, and if they are normal in their amplitude and force. Lack of pulses may signal a narrowed or blocked artery in the arm or leg. If one artery is narrowed, perhaps others, like the coronary arteries in the heart, also may be narrowed
Auscultating or listening to the neck, abdomen and groin for bruits. A bruit is the sound produced within a narrowed artery due to turbulence caused when decreased blood flow occurs across the narrowed area. Bruits can be heard easily with a stethoscope in the he carotid artery in the neck, the abdominal aorta, and the femoral artery .Check sensation in the feet for numbness, decreased sensation, andperipheral neuropathy.

Moreover, many other important conditions may need to be considered as the cause of symptoms. Examples include those arising from the lung (pulmonary embolus), the aorta (aortic dissection), theesophagus(GERD), and the abdomen (peptic ulcerdisease,gallbladder disease).

After the history and physical examination are complete, the health-care professional may require more testing if heart disease is considered a potential diagnosis. There are different ways to evaluate the heart anatomy and function; the type and timing of a test needs to be individualized to each patient and their situation.

Most often, the health-care professional, perhaps in consultation with a cardiologist, will order the least invasive test possible to determine whether coronary artery disease is present. Although heart catheterization is the gold standard to define the anatomy of the heart and to confirm heart disease diagnosis (either with partial or complete blockage or no blockage), this is an invasive test and not necessarily indicated for many patients.

Electrocardiogram(EKG,ECG)

The heart is an electrical pump and electrodes on the skin can capture and record the impulses generated as electricity travels throughout the heart muscle. Heart muscle that has decreased blood supply conducts electricity differently than normal muscle and these changes can be seen on the EKG.

A normal EKG does not exclude cardiovascular disease and coronary artery blockage; there may be narrowing of the coronary arteries that has yet to cause heart muscle damage. An abnormal EKG may be a "normal" variant for that patient and the result has to be interpreted based upon the patient's circumstances.

If possible, an EKG should be compared to previous tracings looking for changes in the electrical conduction patterns.

Stresstests

It would make sense that during exercise, the heart is asked to work harder and if the heart could be monitored and evaluated during that exercise, a test might uncover abnormalities inheart function. That exercise may occur by asking the patient to walk on a treadmill or ride a bicycle while at the same time, an electrocardiogram is being performed. Medications (adenosine,persantine, dobutamine) can be used to stimulate the heart if the patient is unable to exercise because of poor conditioning, injury, or because of an underlying medical condition.

Echocardiography

Ultrasoundexamination of the heart to evaluate the anatomy of the heart valves, the muscle, and its function may be performed by a cardiologist. This test may be ordered alone or it may be combined with a stress test to look at heart function during exercise.

Nuclear imaging

A radioactive tracer that is injected into a vein can be used to indirectly assess blood flow to the heart. Technetium orthalliumcan be injected while a radioactive counter is used to map out how heart muscle cells absorb the radioactive chemical and how it is distributed in heart muscle cells may help determine indirectly whether a blockage exists. An area of the heart with no uptake would suggest that the area is not getting enough blood supply. This test may also be combined with an exercise test.

Cardiaccomputerized tomography(CT) andmagnetic resonance imaging(MRI)

Using these scans, the anatomy of the coronary arteries can be evaluated, including how much calcium is present in the artery walls and whether blockage or artery narrowing are present. Each test has its benefits and limitations and the risks and benefits of considering a CT or MRI depends upon a patient's situation.

Cardiac catheterization

Cardiac catheterization is the gold standard for coronary artery testing. A cardiologist threads a thin tube through an artery in the groin, elbow, or wrist into the coronary arteries. Dye is injected to assess the anatomy and whether blockages are present. This is called acoronary angiogram.

If a blockage exists, it is possible thatangioplastymay be performed. Using the same technique as theangiogram, a balloon is positioned at the site of the obstructing plaque. When the balloon is inflated, the plaque is squashed into the wall of the artery to re-establish blood flow. Astentmay then be placed across the previously narrowed segment of artery to prevent it from narrowing again.

Cardiologists are specialists who treat cardiovascular heart disease. In addition to confirming the diagnosis using a heart catheterization, they often can perform angioplasty to dilate or open a narrowed or blocked artery and restore blood supply to the heart muscle. As well, cardiologists help manage patients with chest pain to minimize the risk of future heart muscle damage.

Cardiothoracic surgeons operate on the heart and performcoronary artery bypasssurgery if the coronary arteries are severely blocked and the patient is not a candidate to have angioplasty. These surgeons also repair or replace heart valves and perform other surgeries that involve the structure of the heart.

Primary care practitioners, including those in family medicine, internal medicine specialists, and women's health, often help make the initial diagnosis of heart disease and can manage stable patients who do not need invasive procedures or interventions. These providers also work to help minimize potential risk factors for heart disease, so that it does not develop, or if it is already present, to minimize the progression of the artery blockages.

Emergency physicians often make the diagnosis of angina when a patient presents with symptoms of heart disease. As well, when patients present to the ER with symptoms of a heart attack, they work as a team with the cardiologists to treat the patient quickly to restore blood supply to the dying heart muscle.

The goal of treating cardiovascular disease is to maximize the patient's quantity and quality of life.

• Preventionis the key to avoid cardiovascular disease and optimize treatment.
• Once plaque formation has begun, it is possible to limit its progression by maintaining a healthy lifestyle with routine exercise,diet, and by aiming for lifetime control of high官网地址bwin, high cholesterol, and diabetes.

Medical Treatment

• Aspirinmay be used for its antiplatelet activity, making platelets (one type of blood cell that helps blood clot) less sticky and decreasing the risk of a heart attack. The decision to use aspirin routinely depends upon whether other risk factors for heart disease are present.
• Medications may be prescribed in patients with heart disease to maximize blood flow to the heart and increase the efficiency of the pumping function of the heart.
• Beta-blockermedications help block the action of adrenaline on the heart, slowing the heart rate. These medications also help the heart beat more efficiently and decrease the oxygen requirements of the heart muscle during work.
• Calcium channel blockersalso help the heart muscle contract and pump more efficiently.
• Nitrateshelp dilate arteries and increase blood flow to the heart muscle. They may be short-acting (Nitrostat) to treat acute angina symptoms or long-acting preparations (Imdur) may be prescribed for prevention.
• Should there be significant stenosis or narrowing of the coronary arteries, angioplasty and/or stenting (described above) may be considered to open the blocked areas. These procedures are performed in conjunction with cardiac catheterization. Depending upon the patient's anatomy and the extent of the blockage present,coronary artery bypass graft手术(CABG) may be required.
• If a stent is placed, otherantiplatelet medicationslike clopidogrel (Plavix) may be prescribed.

The goal of treating cardiovascular disease is to maximize the person's quantity and quality of life. Prevention is the key to avoiding cardiovascular disease and optimizing treatment. Once plaque formation has begun, it is possible to limit its progression by making these lifestyle changes:

• Maintain a healthy lifestyle with routine exercise
• Quit smoking
• Eat a heart-healthydietsuch as theMediterranean Diet.
• Aim for lifetime control of high blood pressure, high cholesterol, and diabetes.

It may take 10 to15 years from the beginning of a plaque formation in a coronary artery to narrow that artery to constrict blood flow.

The American Heart Association and the American College of Cardiology have developed guidelines so that healthcare professionals may counsel and treat their patients to decrease the risk of developing heart disease. New attention is being paid to the role of weight reduction, diet, exercise, and the use of cholesterol-lowering medications calledstatins.

In the past, the goal for statindrugslikeatorvastatinwas to lower the blood cholesterol level to a specific number, and statins were prescribed for patients with highcholesterol levelsor those who had hadheart attacks. The new guidelines recommend that more patients may benefit from these statin drugs. Rather than having specific cholesterol numbers as a goal, the new goal is to lower the blood cholesterol level by 50% in high-risk patients and by 30% to 50% in those who are at lower risk to develop heart disease. You and your doctor should discuss which goals are best for your condition.

For patients with a history of heart attack,transient ischemic attack(TIA), orstroke, statins may be appropriate for patients with highLDL cholesterollevels (the “bad” cholesterol), for example, those who havetype 2 diabetes, and those who have a 10-year risk of a heart attack greater than 7.5%. You and your healthcare professional may estimate risk by using the American Heart Association and American College of Cardiology's ASCVD (Atherosclerotic Cardiovascular Disease) Risk Calculator.

Preventing cardiovascular disease is a lifelong commitment to controlling blood pressure, and high cholesterol, quitting smoking, and diabetes. Now, new opportunities exist to decrease risk even further with these new guidelines. These are also the steps to take to decrease the risk ofstrokeand peripheral artery disease.

• An estimated 15.5 million people in the United States have coronary artery disease.
• Each year, 1.5 million patients suffer anacute myocardial infarctionand more than 600,000 people die.
• With a better understanding of the different signs and symptoms of heart disease, especially the "atypical" symptoms experienced by women and the elderly, the diagnosis of heart disease has improved.
• The prognosis for the patient is better when diagnosis and treatment are initiated early.
• Educating the public about early access to emergency services when a patient develops acute chest pain can help save lives.
• The goal of the treatment of heart disease is to maximize longevity and quality of life.