Review Article

Anesthesia Management for Carotid Endarterectomy: Review Article

10.32596/ejcm.galenos.2019.00010

  • Fulya Yılmaz

Received Date: 23.02.2019 Accepted Date: 22.05.2019 EJCM 2019;7(2):50-59

Atherosclerotic carotid artery disease is responsible from 20% to 25% of ischemic stroke events. Open carotid surgery and stent insertion are two main types of treatment procedures. Carotid endarterectomy (CEA) can be performed under general anaesthesia, regional anaesthesia (interscalen block, cervical plexus block either by landmark technique or by US guidance), combination of general and regional anaesthesia, regional anaesthesia with combination of periferic block. The aim of all anesthesic techniques is to prevent pain during the three painful periods (1. Skin incision, 2. Insertion of a retromandibular retractor, 3. Perivascular preparation) during CEA). All techniques have their own advantages and disadvantages. But there is no certain data about which one is superior to other. There is no consensus on anaesthetic choice for CEA. At present regional anaesthesia versus general anaesthesia for patients undergoing CEA is still debate topic. Improvements in medical theraphy, use of cerebral monitoring, better timing for surgery after ischemic events, better surgical techniques, increased use of ultrasound for regional anaesthesia improve procedural outcomes. Despite these improvements, anaesthesia management is still deciding according to surgeon and anaesthesiologist preferences, the patient’s satisfaction and the conditions in the hospitals where we work.

Keywords: Carotid endarterectomy, anaesthesia techniques, general anaesthesia, cervical plexus block, local anaesthesia

Introduction

Atherosclerotic carotid artery disease, which leads to cerebrovasculer diseases by embolization of atheromatous material or thrombotic occlusion, responsible from 20% to 25% of ischemic stroke events(1-4). Open carotid surgery and stent insertion are two main types of treatment procedures(5). Carotid endarterectomy (CEA) was first reported at St. Mary’s Hospital, London, in 1954(1,6) and since 1970, CEA accepted as the best treatment option in patients who has high grade carotid artery stenosis(7). While CEA is accepted as “gold standart” in symptomatic patients with stenosis >70%; there is still a controversy in management of asymptomatic patients(2,3,5,8,9). Stent insertion for carotid stenosis was first reported by Kerber et al. in 1980, approximately 30 years after the CEA(6). Two main types of techniques are used in CEA: ventrojugular approach (the standart surgical technique) and retrojugular approach (improve patient tolerance and facilitate the surgical procedure)(5). CEA is a preventive surgery and useful in symptomatic patients if the operation can be done within two weeks. On the other hand, patients undergoing CEA have so many comorbidities and prone to intraoperative hemodynamic fluctuations(6,10,11-13). Although anaesthesiologists have a very limited time to optimize the patient, they should also select the most appropriate method for anaesthesia management(10,14).

CEA can be performed under general anaesthesia, regional anaesthesia [interscalen block, cervical plexus block either by landmark technique or by ultrasound (US) guidance], combination of general and regional anaesthesia, regional anaesthesia with combination of periferic block(8,10). The aim of all anesthesic techniques is to prevent pain during the three painful periodss (1. Skin incision, 2. Insertion of a retromandibular retractor, 3. Perivascular preparation) during CEA(15). All techniques have their own advantages and disadvantages. But there is no certain data about which one is superior to other(8-10,16-18). Radak et al. conducted a study to answer the question “Should the guidelines now be updated for CEA?”. They reported that improves after CEA procedures can be explained by improvements in medical therapy, more appropriate timing of CEA, the use of local anaesthesia and the se of preoperative cerebral monitoring and as well as improves in surgical techniques(6).

The General versus Local Anaesthesia which is the only large randomized control study comparing general anaesthesia (GA) and regional anaesthesia (RA) (Landmark guided superficial cervical plexus block or deep cervical plexus block) for CEA, conclude that there is no difference in myocardial infarction (MI), death and stroke when comparing GA with RA. On the contrary shunt requirement was 50% in GA group, 14% in RA group(19). Moulakakis et al.(20) advocate to perform a study, compared CEA under RA without shunting, even if patients manifest neurological symptoms, compared with CEA under GA without shunting, answer the question: “The role of shunting in preventation of stroke.”   

NSQIP (National Surgical Quality Improvement Program) study compared 30-day postoperative MI, stroke, and mortality between CEA under RA or local anaesthesia (LA) and CEA under GA. NSQIP study analysis suggests that CEA under GA has an increased risk of postoperative MI. They prefer patients to undergo CEA either by RA or LA, who have risk for postoperative MI(4).

Malik et al. demonstrated that the use of RA versus GA in CEA is associated with decreased risk of postoperative pneumonia and reduced need for perioperative blood transfusions(18). Markovic et al. reported that type of anaesthesia does not affect the outcome of surgical treatment of CEA but regional techniques are related with fewer respiratory complications, later requirement for first postoperative analgesic and awake patient after surgery (who can continue oral theraphy earlier)(21). Lobo et al. reviewed their 10 year practice of GA and locoregional anaesthesia for CEA. They showed that the number of studies about impact of anaesthesia type (evaluating delirium, cognitive impairment and quality of life after surgery) is very small. This indicates a need for randomized studies(22).

Cross-clemp intolerance (CCI) is a rare event during CEA. Hypertension and symptomatic carotid stenosis were independent and significant risk factors for CCI. Recently, in selective patients, carotis artery stending (CAS) has been used as alternative treatment for CEA who developed CCI during CEA. If patient has risk factors for CCI, GA is more suitable option as anaesthesic method because of risk for shunting or conversion to CAS(23). On the other hand, Dellaretti et al. demonstrated that locoregional anaesthesia is a safe method for identifying patients with CCI and the mean degree of contralateral carotis stenosis was associated with CCI(24). Several CREST (Carotid Revascularization Endarterectomy versus Stenting Trial) showed that CAS was associated with a significantly higher risk of stroke, CEA is associated with higher incidence of MI. In other CREST study performed by Hye et al. reported that risk of periprocedural MI was similar in patients undergoing CEA under RA and those undergoing CAS. But the risk was doubled in CEA under GA compared to the patients undergoing CAS(25). Hoefer et al. assessed early sympathetic activity during CEA in ultrason guided-intermediate cervical plexus block with GA. Although, United States-Information and Communications Policy Bureau (US-ICPB) is a feasible, effective and safe form of RA for CEA; it induces temporary intraoperative hypertension and increase the stress hormone levels(26).


Anaesthesia methods for carotid endarterectomy:

1. General anaesthesia: GA is still the most preferred anaesthetic technique for CEA(1,27).


Advantages of GA are:

* Control of ventilation (Tight control of arterial carbon dioxide concentration)(1,3, 9,14,28)

* Cerebral protection afforded by volatile anaethesia (especially during the cross-clamp)(1,2,9,10,25,29)

* Airway security (Anaesthetist preference)(1,7,9,10,28)

* Excellent and comfortable operation conditions (especially in patients with high carotid bifurcation)(3,7,10,25,29)

* Prevent myocardial ischemia(10)

* Less stressful than a regional procedure(3,25)

* Prevent patients from coughing and straining(10)

* Possibility of inducing hypothermia if required(9)


Disadvantages of GA are:

* GA necessitates shunt insertion more commonly than RA techniques(3,7,30)

* Requires brain monitoring (stump pressure, somatosensory evoked potential, transcranial Doppler, EEG and near-infrared spectroscopy, juguler venous oxygen,cerebral oximetry)(3,7,9,14,30). These methods shows poor sensitivity and specificity according to awake patient, in terms of requirement for shunt placement(9,11).

* Anaesthetic-induced circulatuar depression is associated with labile blood pressure(3) and necessitates greater vasopressor support (to ensure adequate cerebral perfusion pressure during carotid cross-clemping)(3,7)

* Higher incidence in postoperative neurocognitive dysfunction(7,27,28)

Only general anaesthesia: General anaesthesia can be performed by intubation (preferred) or by laryngeal mask airway (in difficult airway circumstance) for CEA(7,10). General anaesthesia can be managed using inhaled or total intravenous agents Cerebral metabolic rate reductions are similar with propofol and halogenated volatile agents but cerebral blood flow is lower with propofol than halogenated volatile agent(27).

Kuzkov et al. reported that sevoflurane (induction and maintenance of anaesthesia with sevoflurane) is better than propofol (Total intravenous anaesthesia with propofol) to improve early postoperative cognitive dysfunction(31). Wang et al. results offers low-dose sevoflurane with propofol in patients undergoing CEA reduces the incidence of myocardial injury in symptomatic patients after CEA(32).

Tsujikawa et al. reported that low-dose dexmedetomidine improves hemodynamic stability during the emergence and the recovery phases of general anaesthesia in patients undergoing CEA, in their randomized double-blind placebo-control trial(29).

General anaesthesia with superficial cervical plexus block: Addition of superficial-CPB to general anaesthesia provides lower VAS scores at discharge from the postoperative care unit(5).

Combined general anaesthesia with regional anaesthesia: Recent studies reported that the quality of block should be evaluated according to the “patient satisfaction”. So new trend is combination of RA with GA(9).

General anaesthesia with cooperative patient: It is like “wake-up” test performed during neurosurgical surgeries(1,9). Anaesthesia is induced and maintained with propofol and remifentanil. Before clamping, doses of drugs are reduced until patient obey the verbal comments(1). It was first used by Baldinelli during CEA(9). The first pilot study, performed by Luchetti, reported that it guaranteed more stable hemodynamic conditions, better patient comfort and more effective analgesia as compared to superficial cervical plexus block alone during CEA(33). Then Bevilacqua defined a new technique: “Cooperative Patient General Anaesthesia” (Co.PA.Ge.A.), which is similar to Luchetti technique. In this technique, LA is injected to the anterior borer of sternocleidomastoid muscle, instead of superficial cervical plexus block. In these three studies remifentanil was used as opioid in general anaesthesia application and demonstrated as safe and with low rate of conversion to GA(9).

Regional anaesthesia: “Right dose of the right drug placed in the right place” is a sentence that describes the “gold standart” in every nerve block(1,9).


Advantages of regional anaesthesia are:

* Awake patient is the gold standart cerebral function monitoring(1,3,9,11,12,14,17,28,34)

* Reduce cardiac and respiratory related morbidity(1,3,30,34),

* Lower shunt insertion rate(1,3,9,16,25,30),

* Shorten hospital stay(1,3,14,17,25,27,34),

* Lower cost(1,3,25, 27),

* Improves outcomes after surgery (better postoperative analgesia, reduce blood loss, lower risk of tromboembolic events)(1,14,25),

* Safer(1),

* Safe method to identify the patients at risk for cross-clamp intolerance(1,3,12),

Hemodynamic stability(9,10,12,17,25,28),

* Preserved cerebral autoregulation(3,10,28,30),

* Reduce vasopressor requirement(28),

* Reduces operative time(25),

* Disadvantages of regional anaesthesia are:

* Needs patient collaboration(3,7,28),

* Procedural complications (diaphragmatic and vocal cord paralysis, neural injuries, epidural, subaracnoid or intravascular injection of local anaesthetics)(7),

* Urgent conversion of regional anaesthesia into general anaesthesia(7,9,35),

* Anxiety during the operation(9,35).

Cervical epidural block: For CEA an epidural catheter is sited at C6-C7 level and a dilue LA solution is injected (exp: 0.25% bupivacaine)(14). It provides suitable operation conditions but associated with major anesthetic complications (dural tap, epidural hematoma, direct spinal cord damage)(10,14). But conversion to general anaesthesia is higher because of higher techniqual failure rate and higher rate of life-threatening complications(5,14,36,37). Hakl et al. compared cervical epidural block and cervical plexus block (superficial and deep blocks) for failure rate and the frequency of anaesthesia related complications. Although both methods were acceptable for CEA, anaesthesia related complications are lower with CPB. Failure rates were similar between the groups(37).

Posterior cervical paravertebral block: Single injection, at C4 level, using nerve stimulator for blocking C2-4 dermatomes is another anaesthetic technique for CEA. By this technique, accidental vascular injury or injection is low(14).

Cervical plexus block (CPB): CPB is commonly accepted RA technique for CEA(16). Cervical plexus formed by anterior rami of four upper servical spinal nerves. It has two branches. 1. Superficial branches: provides cutaneous innervations to the head and anterolateral neck; 2. Deep branches: innervates muscles of the anterior neck, the anterior and middle scalen and the diaphragm(5,10,14). Carotid surgery requires blockade of C2-C3-C4 cervical nerves(5,11,38). Cervical fascia classified as superficial and deep fascia. Deep cervical fascia has three layers: Superficial layer (investing layer), middle layer and deep layer(39). Figure 1 is showing the sides of injection for CPBS(34). Regional anaesthesia can be performed by landmark technique or Ultrasound (US) guidance(1). There is a difficulty in classifiying the CPBs when landmark technique is used. Because exact location of the needle cannot known. If needle perforates the investing layer of the neck, this block should be termed as “intermediate block” instead of “superficial block”. CPBs can be performed more thoroughly and safely by US-guidance(39). US guidance during performing the block, permits direct visualization of nerve and other structures(1,9,17,38,39), observation of the needle and LA spreading during injection(9,17,38,39), increases the efficiency (faster onset and longer duration) and success rate, lower puncture related complications (avoidance of accidental vascular puncture), reduces LA dose (prevents tissue swallowing)(3,7,9-11,15,17,38-41). Disadvantages of CPB are palsy of the vagus nerve (which causes hoarseness, difficulty in swallowing, respiratory distress and are not clinically significant), conversion to general anaethesia because of block related complications or inadequate analgesia(1). One of the major complication of RA is the need for urgent convertion to GA especially with cervical epidural block and deep servical block(1,3,8,10). Indications for conversion from RA to GA are both surgery (loss of consciousness at carotid clamping, shunt related complications) and anaesthesia (block failure, pain and restlessness, claustrophobia, systemic toxicity of LA, airway obstruction, accidental subarachnoid injection, diaphragmatic or vocal cord paralysis causing respiratory distress) related(8). Pandit et al conducted a study to assess the complication rates associated with superficial (or intermediate) and deep (or combined deep plus superficial/intermediate)(34). They conclude that superficial/intermediate block is safer than any method that employs a deep injection. The main reason to convert GA with deep cervical plexus block (DCPB)/ deep combined CPB is direct complication of the block. Blocks combined with SCPB provides better analgesia. Pasin et al. reported that RA is the first-choice in their center(8). In their practice, CEA under RA is safe and associated with very low rate of conversion to GA. The exact concentration and volume of LA for nerve blocks is still debated(9). The block that was performed with lower dose LA under US-guidance is effective as that LA has to surround the entire nerve, “Doughnut sign”, for successful block(9). Clinicians may prefer one block to another but there is no consensus which one is the best(34).

a. Superficial cervical plexus block (SCPB): Local anaesthetic is administered to posterior border of sternocleidomastoid muscle, superficial to the investing layer of deep cervical fascia(1,10,14,34,41,42). It is a simple subcutaneous injection with an easy technique as described by Murphy and Scott(9,34,35,41). SCPB can be performed under traditional or US-guidance technique. Nevertheless, the success rate of the techniques, onset time and total anaesthesia related times are similar(9,14). The advantages US-guided technique over landmark technique are visualize the spread of LA and avoid accidental puncture of structures(14). While large volumes (20-30 mL) of LA are used for SCPB by landmark technique; lower volumes (10-15 mL) of LA are used for SCPB by US-guidance(26). It only provides analgesia, not paralyze the muscles(9,10,14). According to Hariharan et al. experience, when SCPB is used alone, there is an increased need for supplementation of LA infiltration, especially during the dissection of the distal portion of ICA(43).

SCPB is associated with lower complication rates(10). Complications related with SCPB are hematoma, infection, local anesthetic toxicity and inadvertent intravascular injection(1).

b. Intermediate cervical plexus block (ICPB): In 2003 Pandit et al. in 2004, Telford and Stoneham defined “intermediate-CPB” as the injection of LA between the superficial and deep cervical fascia(9,14,38,39,42,44). Local anaesthetic is administered under the investing layer of the deep fascia and superficial to the prevertebral fascia(1,10,34). ICPB can be performed by landmark (loss of resistance or pop technique) or US-guided technique(38,42). Choquet first described US-guided ICPB(9). US-guided ICPB can be performed anterior or posterior approach. Up to date, only one study described the technique of US-ICPB for CEA by using anterior approach. Authors reported that anterior approach is easy to perform than posterior approach(38, 39,42). Complications of ICPB are similar with SCPB(1,42). The authors showed that the deep cervical fascia is permeable(9,42). It means that ICPB is safer than deep-CPB(9,42), paralyzes the muscles like deep cervical plexus block(1,9,14,42) but it doesn’t associated with serious complications like deep cervical plexus block(9,10,14,42). Theoretically, expectation from ICPB is to reduce the complications related with DCPB(14,38).

Leblanc et al. reported that ICPB by US-guidance was safe (even in patients receiving antitrombotic agents), simple to perform, provide effective anaesthesia (with real-time neurological assessment and adequate haemodynamic stability) for CEA(12).

Barone et al. reported that ICPB by landmark technique is feasible, effective and safe for CEA with low perioperative and postoperative complication rates(44).

c. Deep cervical plexus block (DCPB): Local anaesthetic is administered under deep cervical fascia to cervical transverse process(1,14) either by one single injection or multiple injection (three separate injections)(10,14,16,34,42). The number of injections does not influence LA absorption as reflected by the Cmax and Tmax. Single injection technique can cause less pain during block and may be associated less systemic absorbtion of LA(45); but there is no relationship between the number of injections and overall block efficacy(14). DCPB can be performed by landmark or US-guided technique(9). There are two approach for US guided technique: vertebral artery loop which can be easily identified by US, represents an accurate landmark for C2 transvers process(9,14) or the longus capitis can be identified as a landmark(9). It provides exact analgesia but it is technically difficult and associated with serious complications (epidural, subarachnoid, subdural or vertebral arter injection, seizures, recurrent laryngeal nerve palsy, phrenic nerve palsy, large neck hematoma, Horner’s syndrome, higher convertion rate to GA(1,3,5,9,10,14,17,44). By the introduction of US-guidance technique, the DCPB has become a relatively safe and simple procedure(42).

While performing a deep CPB increasing number of injection from 1 to 3, increasing the injected volume from from 10 to 40 mL, observing a paresthesia, using neurostimulation or US guidance would not confor any clinically advantage over superficial CPB alone(5).

C1. Continous deep cervical plexus block: This block is considered in high risk cases in which the procedure is expected to prolong(14).

Combined block: Combined blocks appears as equally efficacious as SCPB(14).

a. Superficial and deep cervical block: If locoregional anaethesia is choiced for CEA, combined superficial and deep CPB is preferred(44). Although some authors demonstrated that combined superficial and deep CPB is more effective in producing muscle relaxation; others demonstrated that CEA can be successfully performed under S-CPB alone or combined block(9,14). Muscle relaxation with DCPB has not been shown to be important clinically(42). Kavaklı et al. compared combined block (US-guided superficial and deep CPB) with US-ICPB for CEA(38). Based on their result, combined block requires less analgesic requirement, provides lower VAS scores and higher patient satisfaction than US-ICPB.

b. Intermediate and deep cervical block: Another form of combined block(14,34).

c. US-guided ICPB combined with carotid sheath infiltration: Madro et al. compare infiltration anaesthesia with US-guided ICPB combined with carotid sheath infiltration for CEA. They reported that combined block improves patient and surgeon comfort, safer, relatively simple, easy to master, requires little time to perform(36).

US-guided carotid sheat block: Injection of LA to the carotid artery by US-guidance, the place of the operation, called as carotid sheat block instead of cervical plexus block by Casutt et al(11,17,41). But Martusevicius et al. named the block as “locoregional anaesthesia” and Rössel et al. named the block as “perivascular regional anaesthesia”. All authors reported that US-guided carotid sheat block can be performed rapidly, sufficient for surgery, lower supplemental LA during surgery and an alternative approach with lower complication rate(9,11,17).

US-guided high interscalene plexus block: High-resolution US-guided (17.5-MHz device) high interscalene plexus block for CEA was first reported by Roessel et al. Although they reported that they were not encountered with complications, the small study group (n=14) does not allow meaningful conclusion regarding safety of the procedure(46).

Regional anaesthesia with combination of peripheric block: Performing peripheral blocks with US-guidance reduce incidence of LA toxicity compared to peripheral blocks that were performed without US-guidance(38). Combining S-CPB with fascial nerve block may reduce the pain associated with prolonged use of retractor at the cephalic end of the incision(9). Seidel et al. combined US-guided ICPB with new subplatsymal injection technique for peripheral fascial nerve block(15). They reported that US-guided block is feasible, associated with high success rates, especially during initial skin incision. In another study, Seidel et al. combined US-guided ICPB with perivascular LA infiltration; but they reported no clinical benefits of an additional periarterial LA infiltration(40). Blocking mandibular division of trigeminal nerve by intraoral approach, alleviate the submandibular and dental pain which does not respond to administration of LA. It may be useful in patients with high carotid bifurcation or where atheromatous plaque extends cranially in the internal carotid artery(14,47). Ozturk et al. compared the effect of combining CPB (US-guided SPCB and DCPB) with mandibular block for CEA. They reported that combining CPB with mandibular block provides better intraoperative pain control (lower intraoperative VAS scores, reduces intraoperative supplemental LA needs and intravenous analgesic requirement) and greater patient satisfaction than cervical plexus alone(47).

Awake test under regional anaesthesia with sedation: Anxiety, uncomfortable neck position, traction pain are the problems that we encounter when we use RA alone for CEA(28,47). Sedation can be administered as supplement to regional blocks to overcame these limitations. Sedative agents have been used are: opioids (remifentanil, fentanyl), alfa-2-agonists (clonidine, dexmeditomidine), propofol(3,5,14), midazolam(5), historically, butyrophenones (droperidol, haloperidol)(3,14) or with their combinations (midazolam-fentanyl)(5). “Awake test” is the most reliable method for detecting hypoperfusion(28). Studies in literature that compare RA with sedation with dexmedetomidine versus conventional sedation (fentanyl, remifentanyl or midazolam), prefers dexmedetomidine as sedative agent for CEA with RA. Because dexmedetomidine is a selective alpha-2 adrenoreceptor agonist with sedative, analgesic and anesthetic sparing effects. It does not suppress the respiratory function, maintains hemodynamic stability and patients can be awakened easily after cessation of its use(14,28,29).

2. Local anaesthesia: Local anaesthesia can be performed by two technique: Simple layer by layer to approach or four step approach (intradermal injection parallel to the anterior border of sternocleidomastoid muscle, subplatysmal injection, identification and individual infiltration of the cervical nerves and topical carotid anaesthesia)(5,14).

Bhattathiri et al. studied effect of awake CEA under local anaesthesia with sedation on peri-operative blood pressure(13). Their study showed that local anaesthesia maintains a stable blood pressure during and immediately after CEA.


Choice of local anaesthetic and adjuvants

Other issue is LA choice for RA. Lidocaine, mepivacaine, bupivacaine, ropivacaine, levobupivacaine are suitable agents for RA(1,5,48). If a mixture of LA is used, the total amount should be carefully predetermined as their toxicity is additive. Where bupivacaine offers the longest time, the mepivacaine the shortest time for first analgesic requirement(5).

Crıstallı et al. used ropivacaine versus levobupivacaine for cervical plexus block (deep and superficial block by anatomic landmark) to compare arterial blood pressure and incidence of hypotension. That reported ropivacaine as a first drug choice for CPB(48).

Adjuvants may be added to LA to enhance the block efficiency(9). Epinephrine can be added to LA solution(1,5). While epinephrine 1/200,000 (5 mcg/mL) increase the heart rate 15%, epinephrine 1/300,000 (3.75 mcg/mL or 2 mcg/kg) not(5). Clonidine, alpha-2 receptor agonist, induce direct peripheral effects on action potentials or nerve fibres, can be added as adjuvant to LA. It decreases onset time, decresases intraoperative LA and analgesic requirement(5,9,14). Fentanyl (50 mcg) accepted as an analgesic adjuvant to LA. Increase the quality and duration of the cervical block, decrease sedation requirement during CEA and delya the first analgesic requirement after operation(14). Sindjelic et al. combined 10 mL bupivacaine 0.5% and 4 mL lidocaine 2% with the addition of either fentanyl 1 mL or saline placebo for deep cervical plexus block. They reported that addition of fentanyl to LA mixture enhanced the quality and duration of CPB(49).


Conclusion

There is no consensus on anaesthetic choice for CEA. At present RA versus GA for patients undergoing CEA is still debate topic. Improvements in medical theraphy, use of cerebral monitoring, better timing for surgery after ischemic events, better surgical techniques, increased use of ultrasound for regional anaesthesia improve procedural outcomes. Despite all, anaesthesia method should be decided by considering the personal preferences of the surgeons and anesthesiologists, the patient’s satisfaction and the conditions in the hospitals where we work.


Acknowledgements

I sincerely thank for Kadir Koray BAŞ, Health Science University İzmir Bozyaka Training and Research Hospital, Clinic of General Surgery, for his guidance and encouragement in carrying out this review. I thank İbrahim Erdinç, Health Science University İzmir Bozyaka Training and Research Hospital, Clinic of Cardiovascular Surgery, for his comments on the manuscript.

Ethics

Peer-review: Externally and internally peer-reviewed.

Financial Disclosure: The author declared that this study received no financial support.

Images

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