Chest Pain / Angina Pectoris: Difference between revisions

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In 1772 physician William Heberden first described angina pectoris, writing: “''They who are afflicted with it are seized, while they are walking (more especially if it be up hill), with a painful and most disagreeable sensation in the breast, which seems as if it would extinguish life if it were to increase or to continue, but the moment the patient stands still all this uneasiness vanishes''”. <Cite>REFNAME1</Cite>
[[File:Heart_coronary_artery.jpg|thumb|400px|An epicardial coronary artery with a atherosclerotic narrowing]]
Stable angina (pectoris) is a clinical syndrome characterized by discomfort in the chest, jaw, shoulder, back, or arms, typically elicited by exertion or emotional stress and relieved
by rest or nitroglycerin. It can be attributed to myocardial ischemia which is most commonly caused by atherosclerotic coronary artery disease or aortic valve stenosis.  


 
Three major coronary arteries supply the heart with oxygenated blood, the right coronary artery (RCA), the left anterior descending coronary artery (LAD) and the left circumflex artery (LCx). When the coronary arteries are affected by atherosclerosis and the lumen of the coronary arteries progressively narrow, a dysbalance between myocardial oxygen supply and myocardial oxygen consumption may occur, causing myocardial ischemia.  
Stable angina (pectoris) is a clinical syndrome characterized by discomfort in the chest, jaw, shoulder, back, or arms, typically elicited by exertion or emotional stress and relieved by rest or nitroglycerin. It can be attributed to myocardial ischemia which is most commonly caused by atherosclerotic coronary artery disease.
In stable angina this imbalance mainly occurs when oxygen demand increases due to exercise, increased heart rate, contractility or wall stress.
== Introduction ==
Three major coronary arteries supply the heart with oxygenated blood, the right coronary artery (RCA), the left anterior descending coronary artery (LAD) and the left circumflex artery (LCx). When the coronary arteries are affected by atherosclerosis and the lumen of the coronary arteries progressively narrow, a dysbalance between myocardial oxygen supply and myocardial oxygen consumption might occur, causing myocardial ischemia. This imbalance mainly occurs when oxygen demand increases due to exercise, increased heart rate, contractility or wall stress.


A complete history and physical examination are essential to support the diagnosis (stable) angina pectoris and to exclude other (acute) causes of chest pain such as an acute coronary syndrome, aortic dissection, arrhythmias, pulmonary embolism, (tension) pneumothorax or pneumonia, gastroesophageal reflux or spams, hyperventilation or musculoskeletal pain. <Cite>REFNAME2</Cite>  In addition, laboratory tests and specific cardiac investigations are often necessary.
A complete history and physical examination are essential to support the diagnosis (stable) angina pectoris and to exclude other (acute) causes of chest pain such as an acute coronary syndrome, aortic dissection, arrhythmias, pulmonary embolism, (tension) pneumothorax or pneumonia, gastroesophageal reflux or spams, hyperventilation or musculoskeletal pain. <Cite>REFNAME2</Cite>  In addition, laboratory tests and specific cardiac investigations are often necessary.


== History ==
==History==
Patients often describe angina pectoris as pressure, tightness, or heaviness located centrally in the chest, and sometimes as strangling, constricting, or burning. The pain often radiates elsewhere in the upper body, mainly arms, jaw and/or back. <Cite>REFNAME3</Cite> Some patients only complain about abdominal pain so the presentation can be a specific. <Cite>REFNAME4</Cite>, <Cite>REFNAME5</Cite>
[[File:Chest_pain_areas.svg|thumb|Typical chest pain is retrosternal. Pain may radiate to the arms, jaw, and / or back.]]
Patients often describe angina pectoris as pressure, tightness, or heaviness located centrally in the chest, and sometimes as strangling, constricting, or burning. The pain often radiates elsewhere in the upper body, mainly arms, jaw and/or back. <Cite>REFNAME3</Cite> Some patients only complain about abdominal pain so the presentation can be aspecific. <Cite>REFNAME4</Cite>, <Cite>REFNAME5</Cite>


Angina pectoris however has some characteristics that can help to differentiate between other causes of (chest) pain. Angina pectoris is usually is brief and gradual in onset and offset, with the intensity increasing and decreasing over several minutes. The pain does not change with respiration or position. If patients had angina pectoris previously they are often able to recognize the pain immediately.  <Cite>REFNAME6</Cite>
Angina pectoris however has some characteristics that can help to differentiate between other causes of (chest) pain. Angina pectoris is usually is brief and gradual in onset and offset, with the intensity increasing and decreasing over several minutes. The pain does not change with respiration or position. If patients had angina pectoris previously they are often able to recognize the pain immediately.  <Cite>REFNAME6</Cite>
Angina pectoris is a manifestation of arterial insufficiency and usually occurs with increasing oxygen demand such as during exercise. As soon as the demand is decreased (by stopping the exercise for example) complaints usually disappears within a few minutes.
Another way to relieve pain is by administration of nitro-glycerine. Nitro-glycerine spray is a vasodilator which reduces venous return to the heart and therefore decreases the workload and therefore oxygen demand. It also dilates the coronary arteries and increases coronary blood flow. <Cite>REFNAME7</Cite> The response to nitro-glycerine is however not specific for angina pectoris, a similar response may be seen with oesophageal spasm or other gastrointestinal problems because nitro-glycerine relaxes smooth muscle tissue. <Cite>REFNAME8</Cite>


Angina pectoris usually occurs with increasing oxygen demand such as during exercise. As soon as the demand is decreased (by stopping the exercise for example) the angina pectoris usually disappears within a few minutes.  
Depending on the characteristics, chest pain can be identified as typical angina, atypical angina or non-cardiac chest pain, see Table 1.


Another way to relieve pain is by administration of nitro-glycerine spray. Nitro-glycerine spray is a vasodilator which reduces venous return to the heart and therefore decreases the workload and therefore oxygen demand. It also vasodilates the coronary arteries and increases coronary blood flow. <Cite>REFNAME7</Cite> The response to nitro-glycerine is however not specific for angina pectoris, a similar response may be seen with oesophageal spasm or other gastrointestinal problems because nitro-glycerine also relaxes smooth muscle. <Cite>REFNAME8</Cite>
{| class="wikitable" border="1" width="600px"
|-
! align="center" colspan="2" | Table 1. Clinical classification of chest pain <Cite>REFNAME17</Cite>
|-
|valign="top" align="left"|Typical angina (definite)
|Meets three of the following characteristics:
*Substernal chest discomfort of characteristic quality and duration
*Provoked by exertion or emotional stress
*Relieved by rest and/or nitroglycerine
|-
| valign="top"|Atypical angina (probable)
|Meets two of these characteristics
|-
| valign="top"|Non-cardiac chest pain
|Meets one or none of the characteristics
|}


{{multiple image
The classification of chest pain in combination with age and sex is helpful in estimating the pretest likelihood of angiographically significant coronary artery disease, see Table 2.
| align    = right
| direction = horizontal
| width    = 300


| image1  = Table_1_-_pretest_probabilities.png
{| class="wikitable" border="1" width="600px"
| alt1    = Table 1. Pretest probabilities of >= 50% Diameter Stenotic Coronary Artery Disease in Patients with Chest Pain
|-
| caption1 = Table 1. Pretest probabilities of >= 50% Diameter Stenotic Coronary Artery Disease in Patients with Chest Pain
! align="left" colspan = "7" | Table 2. Clinical pre-test probabilities <sup>a</sup> in patients with stable chest pain symptoms. <Cite>REFNAME20</Cite>
|-
| align="center"|
| align="center" colspan="2" bgcolor="#FFFFFF" | <b>Typical angina</b>
| align="center" colspan="2" bgcolor="#FFFFFF" | <b>Atypical angina</b>
| align="center" colspan="2" bgcolor="#FFFFFF" | <b>Non-anginal pain</b>
|-
! Age
! Men
! Women
! Men
! Women
! Men
! Women
|-
! 30-39
| align="center" bgcolor="#F0F8FF" | 59
| align="center" bgcolor="#F0F8FF" | 28
| align="center" bgcolor="#F0F8FF" | 29
| align="center" bgcolor="#FFFFFF" | 10
| align="center" bgcolor="#F0F8FF" | 18
| align="center" bgcolor="#FFFFFF" | 5
|-
! 40-49
| align="center" bgcolor="#FFCCCC" | 69
| align="center" bgcolor="#F0F8FF" | 37
| align="center" bgcolor="#F0F8FF" | 38
| align="center" bgcolor="#FFFFFF" | 14
| align="center" bgcolor="#F0F8FF" | 25
| align="center" bgcolor="#FFFFFF" | 8
|-
! 50-59
| align="center" bgcolor="#FFCCCC" | 77
| align="center" bgcolor="#F0F8FF" | 47
| align="center" bgcolor="#F0F8FF" | 49
| align="center" bgcolor="#F0F8FF" | 20
| align="center" bgcolor="#F0F8FF" | 34
| align="center" bgcolor="#FFFFFF" | 12
|-
! 60-69
| align="center" bgcolor="#FFCCCC" | 84
| align="center" bgcolor="#F0F8FF" | 58
| align="center" bgcolor="#F0F8FF" | 59
| align="center" bgcolor="#F0F8FF" | 28
| align="center" bgcolor="#F0F8FF" | 44
| align="center" bgcolor="#F0F8FF" | 17
|-
! 70-79
| align="center" bgcolor="#FF69B4" | 89
| align="center" bgcolor="#FFCCCC" | 68
| align="center" bgcolor="#FFCCCC" | 69
| align="center" bgcolor="#F0F8FF" | 37
| align="center" bgcolor="#F0F8FF" | 54
| align="center" bgcolor="#F0F8FF" | 24
|-
! >80
| align="center" bgcolor="#FF69B4" | 93
| align="center" bgcolor="#FFCCCC" | 76
| align="center" bgcolor="#FFCCCC" | 78
| align="center" bgcolor="#F0F8FF" | 47
| align="center" bgcolor="#F0F8FF" | 65
| align="center" bgcolor="#F0F8FF" | 32
|-
| colspan = "7" bgcolor="#FFFFFF"|
|-
! colspan = "7" | ECG = electrocardiogram; PTP = pre-test probability; SCAD = stable coronary artery disease.
|-
| colspan = "7" bgcolor="#FFFFFF" | <b><sup>a</sup></b> Probabilities of obstructive coronary disease shown reflect the estimates for patients aged 35, 45, 55, 65, 75 and 85 years.
*Groups in <i>white boxes</i> have a PTP <15% and hence can be managed without further testing.
*Groups in <i>blue boxes</i> have a PTP of 15–65%. They could have an exercise ECG if feasible as the initial test. However, if local expertise and availability permit a non-invasive imaging based test for ischaemia this would be preferable given the superior diagnostic capabilities of such tests. In young patients radiation issues should be considered.
*Groups in <i>light pink boxes</i> have PTPs between 66–85% and hence should have a non-invasive imaging functional test for making a diagnosis of SCAD.
*In groups in <i>dark pink boxes</i> the PTP is >85% and one can assume that SCAD is present. They need risk stratification only.
|}


| image2  = Table_2_-_classification_of_chest_pain.png
The severity of complaints can be classified according to the Canadian Cardiovascular Society as shown in Table 3
| alt2    = Table 2. Classification of Chest Pain
| caption2 = Table 2. Classification of Chest Pain


| image3  = Table_3_-_classification_of_angina_severity_according_to_the_Canadian_Cardiovascular_Society.png
{| class="wikitable" border="1" width="600px"
| alt3    = Table 3. Classification of Angina Severity According to the Canadian Cardiovascular Society
|-
| caption3 = Table 3. Classification of Angina Severity According to the Canadian Cardiovascular Society
! colspan="2" | Table 3. Classification of angina severity according to the Canadian Cardiovascular Society
}}
|-
! width="100"| ''Class''
| ''Level of Symptoms''
|-
! valign="top"| Class I
| 'Ordinary activity does not cause angina'
Angina with strenuous or rapid or prolonged exertion only
|-
! valign="top"| Class II
| 'Slight limitation of ordinary activity'
Angina on walking or climbing stairs rapidly, walking uphill or exertion after meals, in cold weather, when under emotional stress, or only during the first few hours after awakening
|-
! valign="top"| Class III
| 'Marked limitation of ordinary physical activity'
Angina on walking one or two blocks on the level or one flight of stairs at a normal pace under normal conditions
|-
! valign="top"| Class IV
| 'Inability to carry out physical activity without discomfort' or 'angina at rest'
|}


The classification of chest pain in combination with age and sex is helpful in estimating the pretest likelihood of angiographically significant coronary artery disease (Table 1).  
During angina pectoris ‘vegetative’ symptoms can occur, including sweating, nausea, paleface, anxiety and agitation. This is probably caused by the autonomic nerve system in reaction to stress. <Cite>REFNAME9</Cite>


Depending on the characteristics, chest pain can be identified as typical angina, atypical angina or non-cardiac chest pain (Table 2).
Finally, it is important to differentiate unstable angina (indicating an acute coronary syndrome or even myocardial infarction requiring urgent treatment) from stable angina. Unstable angina typically is severe, occurs without typical provocation and does not disappear with rest, and has a longer duration than stable angina. It is important to initiate prompt treatment in these patients, as described in the acute coronary syndromes chapter.
 
==Physical Examination==
There are no specific signs in angina pectoris. Physical examination of a patient with (suspected) angina pectoris is important to assess the presence of hypertension,
valvular heart disease (in particular aortic valve stenosis) or hypertrophic obstructive cardiomyopathy. It should include the body-mass index, evidence of non-coronary vascular disease which may be asymptomatic and other signs of co-morbid conditions. E.g.: absence of palpable pulsations in the dorsal foot artery is associated with an 8 fold increase in the likelihood of coronary artery disease.


Furthermore, the intensity of the pain can be classified according to the Canadian Cardiovascular Society as shown in Table 3.  
==Electrocardiogram (ECG)==
The electrocardiogram (ECG) is an important tool to differentiate between unstable angina (acute coronary syndrome) and stable angina in addition to the patient’s history. Patients with unstable angina pectoris are likely to show abnormalities on the ECG at rest, in particular ST-segment deviations.
Although a resting ECG may show signs of coronary artery disease such as pathological Q-waves indicating a previous MI or other abnormalities, many patients with stable angina pectoris have a normal ECG at rest. Therefore exercise ECG testing may be necessary to show signs of myocardial ischemia. <Cite>REFNAME10</Cite>


During angina pectoris so called vegetative symptoms can occur, including sweating, nausea, paleface, anxiety and agitation. This is probably caused by the autonomic nerve system being more active in a reaction to stress. <Cite>REFNAME9</Cite>
'''Exercise ECG testing''' is performed with gradually increasing intensity on a treadmill or a bicycle ergo-meter. Exercise increases the oxygen demand of the heart, potentially revealing myocardial ischemia by the occurrence of ST-segment depression on the ECG. <Cite>REFNAME11</Cite>


Finally, it is important to differentiate unstable angina (indicating an acute coronary syndrome or even myocardial infarction requiring urgent treatment) from stable angina. Unstable angina typically is severe, occurs and does not disappear with rest, and has a longer duration than stable angina. It is important to initiate the right treatment in these patients, as described in the acute coronary syndromes chapter.
==Laboratory Testing==
Laboratory testing in the setting of angina pectoris can be useful to differentiate between different causes of the pain, including an acute coronary syndrome in which there will be elevation of the marker of myocardial necrosis. Anaemia should be ruled out as a cause of ischemia. Renal function is important for pharmacological therapy. Moreover, it might assist in establishing a cardiovascular risk profile.


== Physical Examination ==  
==Stress Testing in Combination with Imaging==
There are no specific signs in angina pectoris. Physical examination of a patient with (suspected) angina pectoris is important to assess the presence of hypertension, valvular heart disease, or hypertrophic obstructive cardiomyopathy. It should include the body-mass index, evidence of non-coronary vascular disease which may be asymptomatic, and other signs of co morbid conditions. Absence of palpable pulsations in the dorsal foot artery is associated with an 8 fold increase in coronary artery disease.
Some patients are unable to perform physical exercise. Furthermore, in patients with resting ECG abnormalities the exercise ECG is associated with low sensitivity and specificity.  


== Electrocardiogram (ECG) ==
{| class="wikitable" border="1" width="600px"
The electrocardiogram (ECG) is an easy and important tool to differentiate between unstable angina (acute coronary syndrome) and stable angina. Patients with unstable angina pectoris are likely to show abnormalities on the ECG at rest, in particular ST-segment deviations.
|-
Although a resting ECG may show signs of coronary artery disease such as pathological Q-waves indicating a previous MI or other abnormalities, most patients with stable angina pectoris often have a completely normal ECG at rest. Therefore exercise ECG testing might be necessary to show signs of myocardial ischemia. <Cite>REFNAME10</Cite>
|colspan = "7" | <b>Table 4. Characteristics of tests commonly used to diagnose the presence of coronary artery disease. <Cite>REFNAME20</Cite></b>
|-
| bgcolor="#FFFFFF" rowspan="2"|
|align="center" colspan="2" bgcolor="#FFFFFF" | <b>Diagnosis of CAD</b>
|-
| align="center" bgcolor="#FFFFFF" | <b>Sensitivity (%)</b>
| align="center" bgcolor="#FFFFFF" | <b>Specificity (%)</b>
|-
| <b>Exercise ECG <sup>a, 91, 94, 95</sup></b>
!45–50
!85–90
|-
| <b>Exercise stress echocardiography <sup>96</sup></b>
!80–85
!80–88
|-
| <b>Exercise stress SPECT <sup>96-99</sup></b>
!73–92
!63–87
|-
| <b>Dobutamine stress echocardiography <sup>96</sup></b>
!79–83
!82–86
|-
| <b>Dobutamine stress MRI <sup>b,100</sup></b>
!79–88
!81–91
|-
| <b>Vasodilator stress echocardiography <sup>96</sup></b>
!72–79
!92–95
|-
| <b>Vasodilator stress SPECT <sup>96, 99</sup></b>
!90–91
!75–84
|-
| <b>Vasodilator stress MRI <sup>b,98, 100-102</sup></b>
!67–94
!61–85
|-
| <b>Coronary CTA <sup>c,103-105</sup></b>
!95–99
!64–83
|-
| <b>Vasodilator stress PET <sup>97, 99, 106</sup></b>
!81–97
!74–91
|-
| colspan="3" bgcolor="#FFFFFF"| <b>CAD</b> = coronary artery disease; <b>CTA</b> = computed tomography angiography; <b>ECG</b> = electrocardiogram; <b>MRI</b> = magnetic resonance imaging; <b>PET</b> = positron emission tomography; <b>SPECT</b> = single photon emission computed tomography.
|-
| colspan="3"|<b><sup>a</sup></b> Results without/with minimal referral bias.


'''Exercise ECG testing''' is performed with gradually increasing intensity on a treadmill or a bicycle ergo meter. Exercise increases the oxygen demand of the heart, potentially revealing myocardial ischemia by the occurrence of ST-segment depression on the ECG. <Cite>REFNAME11</Cite>
<b><sup>b</sup></b> Results obtained in populations with medium-to-high prevalence of disease without compensation for referral bias.


== Laboratory Testing ==
<b><sup>c</sup></b> Results obtained in populations with low-to-medium prevalence of disease.
Laboratory testing in the setting of angina pectoris can be useful to differentiate between different causes of the pain, including an acute coronary syndrome. Moreover, it might assist in establishing a cardiovascular risk profile.
|}


== Stress Testing in Combination with Imaging ==
[[File:Algorithm_for_the_initial_evaluation_of_patients_with_clinical_symptoms_of_angina.svg|thumb|right|500px|Figure 1. Algorithm for the initial evaluation of patients with clinical symptoms of angina]]
[[File:Figure_1_-_algorithm_for_the_initial_evaluation_of_patients_with_clinical_symptoms_of_angina.png|thumb|right|Figure 1. Algorithm for the initial evaluation of patients with clinical symptoms of angina]]
Some patients might be unable to perform physical exercise. Furthermore, in patients with resting ECG abnormalities, it might be difficult to interpret the exercise ECG. Finally, if the ECG made during exercise testing does not show any abnormalities angina pectoris becomes very unlikely. However, if the diagnosis is still in doubt, the following additional research may be performed.
# Exercise echocardiography means that an echocardiography is made before and during different stages up to peak exercise in order to identify wall motion abnormalities. <Cite>REFNAME12</Cite> An alternative is pharmacological stress testing using dobutamine.
# Myocardium Perfusion Scintigraphy (MPS) is able to show the perfusion of the heart during exercise and at rest based on radiopharmaceutical tracer uptake. <Cite>REFNAME13</Cite>
# Magnetic Resonance Imaging can be done with vasodilatory adenosine or stimulating dobutamine to detect wall motion abnormalities induced by ischemia during pharmacological stress. <Cite>REFNAME14</Cite>
The findings on stress testing can be used to determine the choice between medical therapy only or medical therapy and invasive assessment of the coronary anatomy in patients with stable angina. Coronary angiography is recommended based upon the severity of symptoms, likelihood of ischemic disease, and risk of the patient for subsequent mortality based on stable angina pectoris risk scores. <Cite>REFNAME15</Cite> For the algorithm for the initial evaluation of patients with clinical symptoms of angina (Figure 1).


== Coronary Angiography (CAG) ==
If the ECG made during exercise testing does not show any abnormalities myocardial ischemia becomes unlikely as cause of the complaints. If the diagnosis is still in doubt, the following additional tests may be performed.
#Exercise echocardiography means that an echocardiography is made before and during different stages up to peak exercise in order to identify wall motion abnormalities. <Cite>REFNAME12</Cite> An alternative is pharmacological stress testing using dobutamine.
Coronary angiography (CAG) can assist in the diagnosis and the identification of treatment options for stable angina pectoris. During CAG, the coronary anatomy is visualized including the presence of coronary luminal stenoses. A catheter is inserted into the femoral artery or into the radial artery. The tip of the catheter is positioned at the beginning of the coronary arteries and contrast fluid is injected. The contrast is made visible by X-ray and the images that are obtained are called angiograms.
#Myocardium Perfusion Scintigraphy (MPS) is able to show the perfusion of the heart during exercise and at rest based on radiopharmaceutical tracer uptake . <Cite>REFNAME13</Cite>
#Magnetic Resonance Imaging can be done with vasodilatory adenosine or stimulating dobutamine to detect wall motion abnormalities induced by ischemia during pharmacological stress. <Cite>REFNAME14</Cite>


If stenoses are visible, the operator will judge whether this stenosis is significant and eligible for percutaneous coronary intervention (PCI) or coronary artery bypass grafting (CABG). Ideally PCI happens immediately following the CAG but not all hospitals are entitled to carry out revascularization procedures.
The findings on stress testing can be used to determine the choice between medical therapy only or medical therapy and invasive assessment of the coronary anatomy in patients with stable angina. Coronary angiography is recommended based upon the severity of symptoms, likelihood of ischemic disease, and risk of the patient for subsequent complications including mortality based on risk scores. <Cite>REFNAME15</Cite> For the algorithm for the initial evaluation of patients with clinical symptoms of angina see Figure 1.


== Treatment ==
==Coronoary Angiography==
Stable angina pectoris can be treated by revascularization (PCI or CABG) or optimal medical therapy. The choice depends on factors such as the severity of symptoms and anatomical complexity of the lesion. Current guidelines for myocardial revascularization, recommend revascularization in patients with persistent symptoms despite optimal medical therapy. <Cite>REFNAME16</Cite> Furthermore, revascularization is indicated in case of proven large areas of myocardial ischemia, such as a left main stem stenosis, a proximal LAD stenosis or significant three vessel disease. The choice between PCI and CABG depends on the multitude of factors, and the choice should be made in a team including (interventional) cardiologists and thoracic surgeons.  
Coronary angiography (CAG) can assist in the diagnosis and the selection of treatment options for stable angina pectoris. During CAG, the coronary anatomy is visualized including the presence of coronary luminal stenoses.  A catheter is inserted into the femoral artery or into the radial artery. The tip of the catheter is positioned at the beginning of the coronary arteries and contrast fluid is injected. The contrast is made visible by X ray and the images that are obtained are called angiograms.
If stenoses are visible, the operator will judge whether this stenosis is significant and eligible for percutaneous coronary intervention (PCI) or coronary artery bypass grafting (CABG).  


== Medical Therapy ==
==Treatment==
Initial treatment of stable angina pectoris focuses on medication to keep the oxygen demand of the heart as low as possible. β blockers lower heart rate and blood pressure, decreasing the oxygen demand of the heart. <Cite>REFNAME17</Cite> Nitrates dilatate the coronary arteries so the heart receives more oxygenated blood. <Cite>REFNAME18</Cite> Antiplatelet therapy (aspirin) reduces the risk of development of a thrombus and thus subsequent (coronary) ischemic events. <Cite>REFNAME19</Cite>
Stable angina pectoris is always treated with medical therapy aimed at reducing risk and at alleviating symptoms. Current guidelines recommend revascularization in patients with persistent symptoms despite optimal medical therapy. <Cite>REFNAME16</Cite> Furthermore, revascularization is indicated in case of large areas of myocardial ischemia (such as a left main stem stenosis, a proximal LAD stenosis or significant three vessel disease) and in the presence of high-risk features such as ventricular arrhythmia, heart failure, widening of QRS during ischemia, axis deviation during ischemia or hypotension during ischemia. The choice between PCI and CABG depends on the coronary anatomy and clinical characteristics and the choice should be made in a team including (interventional) cardiologists and thoracic surgeons.  
Apart from starting medication the patient needs to minimize/control any present risk factors like smoking, overweight and drinking alcohol. See chronic coronary diseases.  


== PCI ==  
==Medical Therapy==
The procedure of PCI is similar to a CAG, except this time a catheter with an inflatable balloon will be brought at the site of the stenosis. Inflation of the balloon within the coronary artery will crush the atherosclerosis and eliminate the stenosis. To prevent the collapsing of the arteric wall and restenosis, a stent is often positioned at the site of the stenosis.  
Initial treatment of stable angina pectoris focuses on medication reducing the oxygen demand of the heart. ß blockers lower heart rate and blood pressure. <Cite>REFNAME17</Cite> Nitrates dilatate the coronary arteries and reduce venous return if used to abort an episode of pain. <Cite>REFNAME18</Cite> Antiplatelet therapy (aspirin) reduces the risk of development of a thrombus and thus acute (coronary) ischemic events. <Cite>REFNAME19</Cite>
Risk factors like smoking, overweight, hypertension, dyslipidemia and diabetes need to be treated in order to prevent disease progression and future events. See chronic coronary diseases.  


== CABG ==
==PCI==
There are circumstances in which CABG should be considered, including left main or proximal LAD stenosis or multiple vessel disease. The choice for PCI or CABG depends on multiple patient and lesion characteristics and should be discussed in a specialized heart team involving cardiologists and cardiothoracic surgeons.
The procedure of PCI is similar to a CAG, except this time a catheter with an inflatable balloon will be brought to the site of the stenosis. Inflation of the balloon within the coronary artery will crush the atherosclerosis and eliminate the stenosis. To prevent collapse of the arteric wall and restenosis, a stent is often positioned at the site of the stenosis.  
With CABG, a bypass is placed around the stenosis using the internal thoracic arteries or the saphenous veins from the legs. The bypass originates proximal from the stenosis and terminates distally from the stenosis.


==CABG==
With CABG, a bypass is placed around the stenosis using the internal thoracic arteries or the saphenous veins from the legs. The bypass originates proximal from the stenosis and terminates distally from the stenosis. The operation usually requires the use of cardiopulmonary bypass and cardiac arrest, however in certain cases the grafts can be placed on the beating heart (“off-pump” surgery)
== References ==
== References ==
<biblio>
<biblio>
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#REFNAME18 pmid=3925741
#REFNAME18 pmid=3925741
#REFNAME19 pmid=9355934
#REFNAME19 pmid=9355934
#REFNAME20 pmid=23996286
</biblio>
</biblio>
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