coronary artery bypass graft

• 冠動脈バイパス

関

CABG、coronary artery bypass、coronary artery bypass graft surgery、coronary artery bypass grafting、coronary bypass

WordNet

1. cause to grow together parts from different plants; "graft the cherry tree branch onto the plum tree" (同)engraft, ingraft
2. the act of grafting something onto something else (同)grafting
3. (surgery) tissue or organ transplanted from a donor to a recipient; in some cases the patient can be both donor and recipient (同)transplant
4. (botany) the trumpet-shaped or cup-shaped outgrowth of the corolla of a daffodil or narcissus flower
5. one or more circles of light seen around a luminous object
6. a long cigar with blunt ends
7. (anatomy) any structure that resembles a crown in shape
8. a major thoroughfare that bears important traffic
9. a blood vessel that carries blood from the heart to the body (同)arteria, arterial blood vessel
10. surrounding like a crown (especially of the blood vessels surrounding the heart); "coronary arteries"
11. avoid something unpleasant or laborious; "You cannot bypass these rules!" (同)short-circuit, go_around, get_around
12. a surgically created shunt (usually around a damaged part)

PrepTutorEJDIC

1. (つぎ木の)つぎ穂;つぎ木 / (皮被・内臓・骨などの)移植片 / (木に)〈つぎ穂〉‘を'つぐ,(体に)〈移植片〉‘を'移植する《+『名』+『on』(『upon』,『in』,『into』)+『名』》 / …‘を'結合させる《+『名』+『together』》 / (…に)つぎ木する,移植する《+『on』(『upon』,『in』,『into』)+『名』》
2. 収賄,汚職;贈賄;〈C〉汚職で得たもの / 汚職する,収賄する
3. コロナ(皆既日食のときに見える光冠) / (太陽・月などの)かさ
4. 動脈 / (道路・水路・鉄道などの)勘線,(通信の)主チャンネル
5. 冠状動脈の / 心臓の / 冠状動脈血栓(けっせん)症(coronary thrombosis)

Wikipedia preview

出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2017/03/23 15:16:10」(JST)

wiki ja

[Wiki ja表示]

冠動脈バイパス移植術（かんどうみゃくバイパスいしょくじゅつ、英: coronary artery bypass grafting、CABG）とは虚血性心疾患に対し行われる手術である。最初に行われたCABGは大動脈と冠動脈を繋ぐ冠動脈大動脈バイパス移植術（かんどうみゃくだいどうみゃくバイパスいしょくじゅつ, 英: aortocoronary bypass、A-Cバイパス）であり現代でも広く行われているが、後述するようにその他にも様々な方法によるバイパス術が行われている。

概要

虚血性心疾患は、心臓の筋肉（心筋）への酸素供給量が低下し、需要量を下回ることによって起こる。心筋への酸素供給量が低下する原因の一つに冠動脈の狭窄、閉塞による血流量の低下が挙げられる。冠動脈バイパス術は狭窄した冠動脈の遠位側に大動脈（または内胸動脈）から血管をつなぎ、狭窄部をバイパスすることで血流量の回復をはかる手術である。

歴史

1967年にアメリカクリーブランドのクリーブランドクリニックで、アルゼンチン人のルネ・ファバローロが世界で初めて成功した。

術式

虚血性心疾患の治療方法としてはカテーテルを用いた経皮的冠動脈形成術(PCI)もあり、こちらは血管内治療と呼ばれ、いわゆる一般に考えられるような「皮膚を切開する手術」の必要がなく侵襲が低い（患者の体力的負担が軽い）。しかし、PCIが不可能な（もしくは危険で出来ない）病変があり治療に限界がある。 治療の流れとしてはまず血管造影を行い、PCIが可能な病変であればPCIを行い、不可能なものはCABGへと移行していくことになる。 手術は日本においては基本的に全身麻酔下で行われる。施設によっては硬膜外麻酔で行うところもあるが日本では一般的ではない（国情によって異なる）。手術の手順としては以下の通り。

• 開胸（胸骨正中切開）
• 心膜切開、心臓露出、（オンポンプの場合は）カニュレーションの準備
• 上記と並行してバイパスに使う血管（グラフトと呼ぶ）の採取
• グラフトの末梢側（冠動脈）への吻合
• グラフトの中枢側（大動脈）への吻合（トップエンドが大動脈の場合のみ）
• グラフトの血流をダイレクトエコーで確認
• 止血、ドレーン挿入、ペースメーカーリード装着、閉胸、閉創

このうちグラフトに用いられる血管と、グラフトの冠動脈への縫合に関しては何通りかの方法があるため後述する。

人工心肺装置を使用する方法

詳細は「人工心肺装置」を参照

人工心肺による体外循環を使用し心臓を停止させて縫合を行う黎明期から施されている術式。

人工心肺装置を使用しない方法

従来、常に動いている心臓に太さ数ミリメートルの血管を縫いつけるのは非常に困難であった。しかし、近年スタビライザーという器具が開発され、縫合する部位のみ動きを止めることで心臓が動いている状態のまま手術することが可能となった。この術式を選択する医師も増えてきている。なおこの方法はオフポンプCABG(OPCAB＝オプキャブ)と呼ばれている。

OPCABの利点・欠点

人工心肺を使用しないことで人工心肺使用時のリスクを回避できることである。また、動脈硬化がひどく人工心肺を使用できないような場合でも手術が行える。欠点としては心臓の動きを抑えることで心臓の働きが低下してしまうため、心臓の機能に余裕がない場合手術が行えないことや手術操作中に一時的に冠動脈の血流が減少し不整脈が生じる可能性があること、術者の技量が要求されることなどである。

意見が分かれる項目

CABGに関して、現時点で明確に定まっていない事柄に関して解説する。現在根拠となるデータを集めるべく各国で研究、調査が行われており、標準的な治療方法が確立するまでは時間を要する。

• 人工心肺の必要が無いことから悪影響が少ない（低侵襲）手術方法として期待されたOPCABであったが、確実性に疑問を持たれていることも事実である。人工心肺を使用した方が手術の合併症が少ない、グラフトの開存性が勝っているなど、優れた結果が出ているという報告もある。

グラフトに用いられる血管

静脈を使う場合（静脈グラフト）と動脈を使う場合（動脈グラフト）に大別される。静脈グラフトは古くから用いられていたが、長期間追跡調査によれば静脈グラフトは動脈グラフトよりも開存率が低い。動脈グラフトは、橈骨動脈など使用部位によりグラフトの攣縮（れんしゅく）による血流の低下が問題とされてきたが、塩酸ジルチアゼム製剤など血管拡張薬の進歩により治療成績は改善してきている。

• 静脈グラフト

大伏在静脈

• 動脈グラフト

内胸動脈、橈骨動脈、胃大網動脈

内胸動脈にグラフトをつなぐ（延長する）場合もある。

関連項目

• 静脈血栓塞栓症

脚注

外部リンク

wiki en

[Wiki en表示]

"Heart bypass" redirects here. For the technique to take over the function of the heart and lungs during surgery, see Cardiopulmonary bypass.

Coronary artery bypass surgery
Intervention
Early in a coronary artery bypass operation, during vein harvesting from the legs (left of image) and the establishment of cardiopulmonary bypass by placement of an aortic cannula (bottom of image). The perfusionist and heart-lung machine are on the upper right. The patient's head (not seen) is at the bottom.
ICD-10-PCS	021209W
ICD-9-CM	36.1
MeSH	D001026
MedlinePlus	002946

Coronary artery bypass surgery, also known as coronary artery bypass graft (CABG, pronounced "cabbage") surgery, and colloquially heart bypass or bypass surgery, is a surgical procedure to restore normal blood flow to an obstructed coronary artery.

There are two main approaches. In one, the left internal thoracic artery (internal mammary artery) is diverted to the left anterior descending branch of the left coronary artery. In the other, a great saphenous vein is removed from a leg; one end is attached to the aorta or one of its major branches, and the other end is attached to the obstructed artery immediately after the obstruction to restore blood flow.

It is performed to relieve angina unsatisfactorily controlled by maximum tolerated anti-ischemic medication, prevent or relieve left ventricular dysfunction, and/or reduce the risk of death. It does not prevent heart attacks. This surgery is usually performed with the heart stopped, necessitating the usage of cardiopulmonary bypass; however, two alternative techniques are also available allowing CABG to be performed on a beating heart either without using the cardiopulmonary bypass deemed as "off-pump" surgery or performing beating surgery using partial assistance of the cardiopulmonary bypass called as "on-pump beating" surgery. The latter gathers the advantages of the on-pump stopped and off-pump while minimizing their respective side-effects.

This surgery is often indicated when coronary arteries have a 50% to 99% obstruction. The obstruction being bypassed is typically due to arteriosclerosis, atherosclerosis, or both. Arteriosclerosis is characterized by thickening, loss of elasticity, and calcification of the arterial wall, most often resulting in a generalized narrowing in the affected coronary artery. Atherosclerosis is characterized by yellowish plaques of cholesterol, lipids, and cellular debris deposited into the inner layer of the wall of a large or medium-sized coronary artery, most often resulting in a focal partial obstruction in the affected artery. Each can limit blood flow if it causes a cross-sectional narrowing of at least 50%.

Terminology

Three coronary artery bypass grafts, a LIMA to LAD and two saphenous vein grafts – one to the right coronary artery system and one to the obtuse marginal system.

There are many variations in terminology, in which one or more of "artery", "bypass" or "graft" is left out. The most frequently used acronym for this type of surgery is CABG (pronounced 'cabbage'), pluralized as CABGs (pronounced 'cabbages'). Initially the term aortocoronary bypass (ACB) was more popularly used to describe this procedure. CAGS (coronary artery graft surgery, pronounced phonetically) should not be confused with coronary angiography (CAG).

Number of arteries bypassed

Illustration depicting single, double, triple, and quadruple bypass

The terms single bypass, double bypass, triple bypass, quadruple bypass and quintuple bypass refer to the number of coronary arteries bypassed in the procedure. In other words, a double bypass means two coronary arteries are bypassed (e.g., the left anterior descending (LAD) coronary artery and right coronary artery (RCA)); a triple bypass means three vessels are bypassed (e.g., LAD, RCA and left circumflex artery (LCX)); a quadruple bypass means four vessels are bypassed (e.g., LAD, RCA, LCX and first diagonal artery of the LAD) while quintuple means five. Left main coronary artery obstruction requires two bypasses, one to the LAD and one to the LCX. Bypass of more than four coronary arteries is uncommon.

A coronary artery may be unsuitable for bypass grafting if it is small (< 1 mm or < 1.5 mm), heavily calcified, or located within the heart muscle rather than on the surface. A single obstruction of the left main coronary artery is associated with a higher risk for a cardiac death and usually receives a double bypass.

The surgeon reviews the coronary angiogram prior to surgery and identifies the number of obstructions, the percent obstruction of each, and the suitability of the arteries beyond the obstruction(s) as targets. The presumed number of bypass grafts needed as well as the location for graft attachment is determined in a preliminary fashion prior to surgery, but the final decision as to number and location is made at surgery via direct examination of the heart.

Medical uses

• The 2004 ACC/AHA CABG guidelines state CABG is the preferred treatment for:
  • Disease of the left main coronary artery (LMCA).
  • Disease of all three coronary vessels (LAD, LCX and RCA).
  • Diffuse disease not amenable to treatment with a PCI.
• The 2005 ACC/AHA guidelines further state that CABG is the preferred treatment with other high-risk patients such as those with severe ventricular dysfunction (i.e. low ejection fraction), or diabetes mellitus.

Benefits

• Bypass surgery can provide relief of angina when the location of partial obstructions precludes improving blood flow with stents.
• There is no survival benefit with bypass surgery vs. medical therapy in stable angina patients.
• Bypass surgery does not prevent future myocardial infarctions.

Age per se is not a factor in determining risk vs benefit of CABG.

Results compared to stent placement

CABG or stent placement is indicated when medical management - anti-anginal medications, statins, antihypertensives, smoking cessation, and /or tight blood sugar control in diabetics - do not satisfactorily relieve ischemic symptoms.

• Both PCI and CABG are more effective than medical management at relieving symptoms, (e.g. angina, dyspnea, fatigue).
• CABG is superior to PCI for some patients with multivessel CAD
• The Surgery or Stent (SoS) trial was a randomized controlled trial that compared CABG to PCI with bare-metal stents. The SoS trial demonstrated CABG is superior to PCI in multivessel coronary disease.
• The SYNTAX trial was a randomized controlled trial of 1800 patients with multivessel coronary disease, comparing CABG versus PCI using drug-eluting stents (DES). The study found that rates of major adverse cardiac or cerebrovascular events at 12 months were significantly higher in the DES group (17.8% versus 12.4% for CABG; P=0.002). This was primarily driven by higher need for repeat revascularization procedures in the PCI group with no difference in repeat infarctions or survival. Higher rates of strokes were seen in the CABG group.
• The FREEDOM (Future Revascularization Evaluation in Patients With Diabetes Mellitus—Optimal Management of Multivessel Disease) trial will compare CABG and DES in patients with diabetes. The registries of the nonrandomized patients screened for these trials may provide as much robust data regarding revascularization outcomes as the randomized analysis.
• A study comparing the outcomes of all patients in New York state treated with CABG or percutaneous coronary intervention (PCI) demonstrated CABG was superior to PCI with DES in multivessel (more than one diseased artery) coronary artery disease (CAD). Patients treated with CABG had lower rates of death and of death or myocardial infarction than treatment with a coronary stent. Patients undergoing CABG also had lower rates of repeat revascularization. The New York State registry included all patients undergoing revascularization for coronary artery disease, but was not a randomized trial, and so may have reflected other factors besides the method of coronary revascularization.
• A meta-analysis with over 6000 patients showed that coronary artery bypass was associated with lower risk for major adverse cardiac events compared to drug-eluting stenting. However, patients had a higher risk of stroke events.

Outcomes

Prognosis following CABG depends on a variety of factors, and successful grafts typically last 8–15 years. In general, CABG improves the chances of survival of patients who are at high risk (generally triple or higher bypass), though statistically after about five years the difference in survival rate between those who have had surgery and those treated by drug therapy diminishes. Age at the time of CABG is critical to the prognosis, younger patients with no complicating diseases doing better, while older patients can usually be expected to suffer further blockage of the coronary arteries.

Grafts can become diseased and may partially or completely occlude - that is, lose their patency - in the months to years after bypass surgery is performed. A graft is considered patent if there is normal flow through the graft: flow begins to diminish with around a 70 percent stenosis in the graft.

Graft patency is dependent on a number of factors, including the type of graft used (internal thoracic artery, radial artery, or great saphenous vein), the size of the coronary artery that the graft is anastomosed with, and, of course, the skill of the surgeon(s) performing the procedure. Arterial grafts (e.g. LITA, radial) are far more sensitive to rough handling than the saphenous veins and may go into spasm if handled improperly.

Generally the best patency rates are achieved with the in-situ left internal thoracic artery (the proximal end is left connected to the subclavian artery) with the distal end being anastomosed with the coronary artery (typically the left anterior descending artery or a diagonal branch artery). Lesser patency rates can be expected with radial artery grafts and "free" internal thoracic artery grafts (where the proximal end of the thoracic artery is excised from its origin from the subclavian artery and re-anastomosed with the ascending aorta). Saphenous vein grafts have worse patency rates, but are more available, as the patients can have multiple segments of the saphenous vein used to bypass different arteries.

Veins that are used either have their valves removed or are turned around so that the valves in them do not occlude blood flow in the graft. LITA grafts are longer-lasting than vein grafts, both because the artery is more robust than a vein and because, being already connected to the arterial tree, the LITA need only be grafted at one end. The LITA is usually grafted to the left anterior descending coronary artery (LAD) because of its superior long-term patency when compared to saphenous vein grafts.

Complications

CABG associated

• Postperfusion syndrome (pumphead), a transient neurocognitive impairment associated with cardiopulmonary bypass. Some research shows the incidence is initially decreased by off-pump coronary artery bypass, but with no difference beyond three months after surgery. A neurocognitive decline over time has been demonstrated in people with coronary artery disease regardless of treatment (OPCAB, conventional CABG or medical management). However, a 2009 research study suggests that longer term (over 5 years) cognitive decline is not caused by CABG but is rather a consequence of vascular disease. Loss of mental function is a complication of bypass surgery in elderly people, and might influence procedure cost benefit considerations. Several factors may contribute to immediate cognitive decline. The heart-lung blood circulation system and the surgery itself release a variety of debris, including bits of blood cells, tubing, and plaques. For example, when surgeons clamp and connect the aorta to tubing, resulting emboli block blood flow and cause mini strokes. Other heart surgery factors related to mental damage may be events of hypoxia, high or low body temperature, abnormal blood pressure, irregular heart rhythms, and fever after surgery.
• Nonunion of the sternum; internal thoracic artery harvesting increases the sternum devascularization risk.
• Myocardial infarction due to embolism, hypoperfusion, or graft failure.
• Late graft stenosis, particularly of saphenous vein grafts due to atherosclerosis causing recurrent angina or myocardial infarction.
• Acute renal failure due to embolism or hypoperfusion.
• Stroke, secondary to embolism or hypoperfusion.
• Vasoplegic syndrome, secondary to cardiopulmonary bypass and hypothermia
• Graft failure: grafts last 8–15 years, and then need to be replaced.
• Pneumothorax: An air collection around the lung that compresses the lung
• Hemothorax: Blood in the space around the lungs
• Pericardial tamponade: Blood collection around the heart that compresses the heart and causes poor body and brain perfusion. Chest tubes are placed around the heart and lung to prevent this. If the chest tubes become clogged in the early post operative period when bleeding is ongoing this can lead to pericardial tamponade, pneumothorax or hemothorax.
• Pleural effusion: Fluid in the space around the lungs. This can lead to hypoxia which can slow recovery.
• Pericarditis
• Lower extremity edema, extravasation, inflammation, and eccymoses from vein harvest; entrapment of up to 9 pounds (4.1 kg) of fluid in the extremity is common. This is managed with a thigh length compression stocking, elevation of the limb, and early and frequent slow walking; as well as avoidance of standing in place, sitting, and bending the leg at the knee more than a few degrees.

Open heart surgery associated

• Post-operative atrial fibrillation and atrial flutter.
• Anemia - secondary to blood loss, plus the anemia of inflammation, inflammation being inevitable with opening the chest plus harvesting of leg vein(s) for grafting. A fall in the hemoglobin from normal preoperative levels (e.g. 15) to postoperative levels of 6 to 10 are inevitable. There is no benefit from transfusions until the hemoglobin falls below 7.5. Institutions should establish protocols to ensure transfusions are not given unless the hemoglobin falls below 7.5 without some additional compelling reason(s).
• Delayed healing or refracture of sternum - the sternum is bifurcated logitudinally (a median sternotomy) and retracted to access the heart. Failure to follow "sternal precautions" following surgery could result in delayed healing or refracture of the sternum which was sutured at the closure of the chest wound:
  • Hold a pillow against the chest whenever getting out of or into a chair or bed; or coughing, sneezing, blowing nose, or laughing, in order to oppose the intrathoracic outward force created by these activities on the healing sternum.
  • Avoid using the pectoral muscles, such as by pushing on the chair arms to assist one's self out of a chair, or by using the arms to assist in sitting down. Proper standing technique is to rock three times in the chair and then stand to provide momentum for moving the center of gravity from the sitting to the standing position. Proper sitting technique is to slowly lower the bottom toward the chair seat using gluteus and quadriceps muscles ("legs only") without grabbing the chair arms. Second, patients should avoid lifting objects utilizing the pectoral muscles: carrying light objects with arms extended down at sides, and lifting light objects with the elbows pressed to the chest and using the biceps, are acceptable. Also, avoid using the arms overhead.
  • Avoid sitting in the car front seat (no driving) for at least four weeks: the explosion of the deployment of an airbag could refracture the sternal union.

General surgery associated

• Infection at incision sites
• Sepsis
• Deep vein thrombosis
• Anesthetic complications such as malignant hyperthermia
• Keloid scarring
• Chronic pain at incision sites
• Chronic stress related illnesses

Procedure

Illustration of a typical coronary artery bypass surgery. A vein from the leg is removed and grafted to the coronary artery to bypass a blockage.

Coronary artery bypass surgery during mobilization (freeing) of the right coronary artery from its surrounding tissue, adipose tissue (yellow). The tube visible at the bottom is the aortic cannula (returns blood from the HLM). The tube above it (obscured by the surgeon on the right) is the venous cannula (receives blood from the body). The patient's heart is stopped and the aorta is cross-clamped. The patient's head (not seen) is at the bottom.

1. The patient is brought to the operating room and moved onto the operating table.
2. An anaesthetist or anesthesiologist places intravenous and arterial lines and injects an analgesic, usually fentanyl, intravenously, followed within minutes by an induction agent (usually propofol or etomidate) to render the patient unconscious.
3. An endotracheal tube is inserted and secured by the anaesthetist and mechanical ventilation is started. General anaesthesia is maintained with an inhaled volatile anesthetic agent such as isoflurane.
4. The chest is opened via a median sternotomy and the heart is examined by the surgeon.
5. The bypass grafts are harvested – frequent vessels are the internal thoracic arteries, radial arteries and saphenous veins. When harvesting is done, the patient is given heparin to inhibit blood clotting.
6. In the case of "off-pump" surgery, the surgeon places devices to stabilize the heart.
7. In the case of "on-pump" surgery, the surgeon sutures cannulae into the heart and instructs the perfusionist to start cardiopulmonary bypass (CPB). Once CPB is established, there are two technical approaches: either the surgeon places the aortic cross-clamp across the aorta and instructs the perfusionist to deliver cardioplegia with a cooled potassium mixture to stop the heart and slow its metabolism or performing bypasses on beating state (on-pump beating).
8. One end of each vein graft is sewn on to the coronary arteries beyond the obstruction and the other end is attached to the aorta or one of its branches. For the internal thoracic artery, the artery is severed and the proximal intact artery is sewn to the LAD beyond the obstruction. Aside the latter classical approach, there are emerging techniques for construction of composite grafts as to avoiding connecting grafts on the ascending aorta (Un-Aortic) in view of decreasing neurologic complications.
9. The heart is restarted; or in "off-pump" surgery, the stabilizing devices are removed. In cases where the aorta is partially occluded by a C-shaped clamp, the heart is restarted and suturing of the grafts to the aorta is done in this partially occluded section of the aorta while the heart is beating.
10. Protamine is given to reverse the effects of heparin.
11. Chest tubes are placed in the mediastinal and pleural space to drain blood from around the heart and lungs.
12. The sternum is wired together and the incisions are sutured closed.
13. The patient is moved to an intensive care unit (ICU) or cardiac universal bed (CUB) to recover. Nurses in the ICU monitor blood pressure, urine output, respiratory status, and chest tubes for excessive or no drainage. Excessive drainage suggests continued bleeding which may require re-operation to manage; no drainage suggests an obstructed tube, which can result in cardiac tamponade and/or pneumothorax which can be lethal.
14. After awakening and stabilizing in the ICU for 18 to 24 hours, the person is transferred to the cardiac surgery ward. If the patient is in a CUB, equipment and nursing is "stepped down" appropriate to the patient's progress without having to move the patient. Vital sign monitoring, remote rhythm monitoring, early ambulation with assistance, breathing exercises, pain control, blood sugar monitoring with intravenous insulin administration by protocol, and anti-platelet agents are all standard of care.
15. The patient without complications is discharged in four or five days.

Minimally invasive technique

Alternate methods of minimally invasive coronary artery bypass surgery have been developed. Off-pump coronary artery bypass (OPCAB) is a technique of performing bypass surgery without the use of cardiopulmonary bypass (the heart-lung machine). Avoidance of aortic manipulation may be achieved through the "anaortic" or no-touch OPCAB technique, which has been shown to reduce stroke and mortality compared to on-pump CABG. Further refinements to OPCAB have resulted in minimally invasive direct coronary artery bypass surgery (MIDCAB), a technique of performing bypass surgery through a 5 to 10 cm incision.

Choice of source of grafts

Heart bypass patient showing almost invisible residual scarring. Left: days after operation. Middle: chest scar, two years later. Right: leg scar from harvested vein, two years later.

The choice of vessel(s) is highly dependent upon the particular surgeon and institution. Typically, the left internal thoracic artery (LITA) (previously referred to as left internal mammary artery or LIMA) is grafted to the left anterior descending artery and a combination of other arteries and veins is used for other coronary arteries. The right internal thoracic artery (RITA), the great saphenous vein from the leg and the radial artery from the forearm are frequently used; in the U.S., these vessels are usually harvested endoscopically, using a technique known as endoscopic vessel harvesting (EVH). The right gastroepiploic artery from the stomach is infrequently used given the difficult mobilization from the abdomen.

Follow up

• Acute - patients without complications are typically seen 3–4 weeks post operatively, at which time driving may be resumed and formal cardiac rehabilitation begun to increase aerobic endurance and muscular strength.
• Chronic -
  • a cardiac stress test at five years is recommended, even in the absence of cardiac symptoms.
  • an intensive medical regimen including statins, aspirin, and aerobic exercise is essential to delaying the progression of plaque formation in both the native and grafted vessels.

• Illustration depicting coronary artery bypass surgery (double bypass)

• Illustration of Single bypass

• Illustration of Double bypass

• Illustration of Triple bypass

• Illustration of Quadruple bypass

Number performed

CABG is one of the most common procedures performed during U.S. hospital stays; it accounted for 1.4% of all operating room procedures performed in 2011. Between 2001 and 2011, however, its volume decreased by 46%, from 395,000 operating procedures performed in 2001 to 213,700 procedures in 2011.

Between 2000 and 2012, the number of CABG procedures carried out decreased across the majority of OECD countries. However, there remained substantial variation in the rate of procedures, with the U.S. carrying out four times as many CABG operations per 100,000 people as Spain. These differences do not appear to be closely related to the incidence of heart disease, but may be due to variation in financial resources, capacity, treatment protocols and reporting methods.

History

• The first coronary artery bypass surgery was performed in the United States on May 2, 1960, at the Albert Einstein College of Medicine-Bronx Municipal Hospital Center by a team led by Robert H. Goetz and the thoracic surgeon, Michael Rohman with the assistance of Jordan Haller and Ronald Dee. In this technique the vessels are held together with circumferential ligatures over an inserted metal ring. The internal mammary artery was used as the donor vessel and was anastomosed to the right coronary artery. The actual anastomosis with the Rosenbach ring took fifteen seconds and did not require cardiopulmonary bypass. The disadvantage of using the internal mammary artery was that, at autopsy nine months later, the anastomosis was open, but an atheromatous plaque had occluded the origin of the internal mammary that was used for the bypass.
• Soviet cardiac surgeon, Vasilii Kolesov, performed the first successful internal mammary artery–coronary artery anastomosis in 1964. However, Goetz has been cited by others, including Kolesov, as the first successful human coronary artery bypass. Goetz's case has frequently been overlooked. Confusion has persisted for over 40 years and seems to be due to the absence of a full report and to misunderstanding about the type of anastomosis that was created. The anastomosis was intima-to-intima, with the vessels held together with circumferential ligatures over a specially designed metal ring. Kolesov did the first successful coronary bypass using a standard suture technique in 1964, and over the next five years he performed 33 sutured and mechanically stapled anastomoses in Leningrad (now St. Petersburg), USSR.
• René Favaloro, an Argentine surgeon, achieved a physiologic approach in the surgical management of coronary artery disease—the bypass grafting procedure—at the Cleveland Clinic in May 1967. His new technique used a saphenous vein autograft to replace a stenotic segment of the right coronary artery. Later, he successfully used the saphenous vein as a bypassing channel, which has become the typical bypass graft technique we know today; in the U.S., this vessel is typically harvested endoscopically, using a technique known as endoscopic vessel harvesting (EVH).
• Soon Dudley Johnson extended the bypass to include left coronary arterial systems.
• In 1968, doctors Charles Bailey, Teruo Hirose and George Green used the internal mammary artery instead of the saphenous vein for the grafting.

Cost

According to the CDC, the average cost of hospitalization (only) associated with a coronary bypass operation in the United States in 2013 was $38,707, for an aggregate hospitalization cost of $6.4 billion. The International Federation of Healthcare Plans has estimated the average cost of hospitalization and physician fees for a coronary bypass operation in various countries as shown in the Table below.

Country	Cost
United States	$75,345
Australia	$42,130
New Zealand	$40,368
Switzerland	$36,509
Argentina	$16,492
Spain	$16,247
Netherlands	$15,742
India	$1,583

See also

• Angioplasty
• Cardiothoracic surgery
• Dressler's syndrome
• Hybrid coronary revascularization
• Totally endoscopic coronary artery bypass surgery
• Chest tube

References

External links

• A BBC film showing a patient undergoing a double bypass operation.
• Cleveland Clinic page on coronary artery bypass surgery

UpToDate Contents

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• 1. 冠動脈バイパス術：長期的臨床転帰 coronary artery bypass graft surgery long term clinical outcomes
• 2. 安定冠動脈疾患患者ににおける血行再建術：冠動脈バイパス移植術と経皮的冠動脈形成術の比較 revascularization in patients with stable coronary artery disease coronary artery bypass graft surgery versus percutaneous coronary intervention
• 3. 冠動脈バイパス術後の合併症予防のための内科的治療 medical therapy to prevent complications after coronary artery bypass graft surgery
• 4. 冠動脈バイパス術の心臓以外の早期合併症 early noncardiac complications of coronary artery bypass graft surgery
• 5. 低侵襲冠動脈バイパス術：定義および技術的な問題 minimally invasive coronary artery bypass graft surgery definitions and technical issues

English Journal

• Shrunken Pore Syndrome is associated with a sharp rise in mortality in patients undergoing elective coronary artery bypass grafting.

• Dardashti A1, Nozohoor S1, Grubb A2, Bjursten H1.
• Scandinavian journal of clinical and laboratory investigation.Scand J Clin Lab Invest.2016 Feb;76(1):74-81. doi: 10.3109/00365513.2015.1099724.
• Shrunken Pore Syndrome was recently suggested for the pathophysiologic state in patients characterized by an estimation of their glomerular filtration rate (GFR) based upon cystatin  C, which is lower or equal to 60% of their estimated GFR based upon creatinine, i.e. when eGFRcystatin  C �
• PMID 26647957

• The right Marginal Vessel Bypass Emerging After Right Coronary Artery Stenting.

• Arslantaş U1, Kalkan ME2, Acar RD2, Pala S2, İzgi İA2.
• International journal of cardiology.Int J Cardiol.2016 Jan 15;203:791. doi: 10.1016/j.ijcard.2015.10.189. Epub 2015 Oct 31.
• PMID 26595785

• Frequency, clinical and angiographic characteristics, and outcomes of high-risk non-ST-segment elevation acute coronary syndromes patients with left circumflex culprit lesions.

• Halim SA1, Clare RM1, Newby LK2, Lokhnygina Y1, Schweiger MJ3, Hof AW4, Hochman JS5, James SK6, White HD7, Widimsky P8, Betriu A9, Bode C10, Giugliano RP11, Harrington RA12, Zeymer U13.
• International journal of cardiology.Int J Cardiol.2016 Jan 15;203:708-13. doi: 10.1016/j.ijcard.2015.11.036. Epub 2015 Nov 10.
• BACKGROUND: The relationship between culprit vessel, infarct size, and outcomes in non-ST-segment elevation acute coronary syndromes (NSTE ACS) is unclear. In some reports, the left circumflex artery (LCX) was more often the culprit at angiography than the right coronary artery (RCA) or left anterio
• PMID 26587725

Japanese Journal

• 8. 左小開胸からの多枝OPCAB(<特集>本邦における低侵襲心臓手術の現況)

• 日本外科学会雑誌 117(2), 130-135, 2016-03-01
• NAID 110010047832

• CABGクリニカルパス対象患者在院日数延長症例の要因検討

• 日本クリニカルパス学会誌 = Journal of Japanese Society for Clinical Pathway 18(2), 121-128, 2016
• NAID 40020893880

• Is Bilateral Internal Mammary Arterial Grafting Beneficial for Patients Aged 75 Years or Older?

• Circulation Journal 80(8), 1756-1763, 2016
• NAID 130005166116

Related Links

• coronary artery bypass graft - definition of coronary artery ...

coronary artery bypass graft n. Abbr. CABG A surgical procedure in which a section of vein or other conduit is grafted between the aorta and a coronary artery below the region of an obstruction in that artery. coronary artery bypass ...

• Coronary Artery Bypass Graft: Facts about Heart Bypass Surgery

Read about heart bypass surgery (coronary artery bypass graft surgery, CABG) including how coronary artery disease is diagnosed, treated, recovery time, risks and complications, and the long term results after CABG.

Related Pictures

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★リンクテーブル★

リンク元	「coronary bypass」「冠状動脈バイパス移植片」
拡張検索	「minimally invasive coronary artery bypass graft surgery」「coronary artery bypass grafting」
関連記事	「graft」「grafting」「coronary」「bypass」「corona」

「coronary bypass」

　　[★]

• 冠動脈バイパス

関

CABG、coronary artery bypass、coronary artery bypass graft、coronary artery bypass graft surgery、coronary artery bypass grafting

「冠状動脈バイパス移植片」

　　[★]

英

coronary artery bypass graft

「minimally invasive coronary artery bypass graft surgery」

　　[★] 超低侵襲心臓バイパス手術

「coronary artery bypass grafting」

　　[★] 冠動脈バイパス術 CABG

「graft」

　　[★]

• n

• 移植片、グラフト

• v.

• 移植する、(植物)接木する

関

cell transplant、engraft、engraftment、explant、grafting、implant、implantation、organ graft、organ transplant、tissue graft、tissue transplant、transfer、transplant、transplant recipient、transplantation

　 　 　 　 　

「grafting」

　　[★]

• n.

• 移植、移植法、移植術

関

engraft、engraftment、graft、implant、implantation、transfer、transplant、transplantation

「coronary」

　　[★]

• adj.

• 冠血管の、冠状動脈の

関

coronary artery、coronary vessel

　 　

「bypass」

　　[★]

• n.

• バイパス、迂回

• v.

• バイパスする、迂回する

　 　

「corona」

　　[★] コロナ帯