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1 Prophylactic Surgery: Why, When, and How?
11
complications that may develop due to the dis­ease with PS especially the anxiety that occurs due to the risk of cancer relieves and the QoL increases.
1.2 In Conclusion
Prophylactic surgery aims to eliminate the target organ before the life-threatening disease devel­ops, increase the expected survival, and prevent the decrease in the quality of life. The term “pro­phylactic surgery,“which indicates preventing the probable event before it occurs, has become more popular and gained importance by the cur­rent advances in medical literature, surgical tech­niques, and biomedical equipment.
Experienced centers should follow up the patients with genetic predispositions, and advanced diagnostic tools and specialist doc­tors.
Early diagnosis will result in a higher chance of cure, more comprehensive surgery, fewer com­plications, less mortality, lower cost, longer sur­vival, and improved quality of life.
Increasing the detectability of mutant genes, mainly in genetically inherited cancers, will result in high surveillance, prevention, and surgi­cal interventions for prophylactic purposes will become more important.
Surgical resections will begin to be per­formed in a different size, with a minimally invasive surgery technique. As the pathophys­iology of the diseases is well understood, PS will nd more application areas in our future lives and surgical clinics with its wide variety of dimensions.
Prophylactic surgery will take its place in the future as a discipline with a corporate identity that adopts a multidisciplinary approach.
The cost-effective dimension of PS will appear as new problems that should be evaluated in the future by insurance companies and health service providers.
Legal, ethical, social, and psychological dimensions of prophylactic initiatives will need to be examined with wide and multicentric center participation.
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Minimally Invasive Procedures and Prophylactic Surgery
ViktorJustin andSelmanUranues
2
2.1 Introduction
The aim of preventive surgery is to preclude the development of diseases and/or their long-term effects, and consequently to reduce morbidity and mortality. In this context, the old dogmas “primum nihil nocere(rst, do no harm) and the cure must not be worse than the disease” are of highest importance. A procedure that aims to prevent a disease can be considered as being highly elective, and morbidity as well as complication rates must be as low as possible and acceptable. These procedures are often per­formed on active healthy persons in working age and thus should aim to be effective in prophylaxis with minimal strain on patient health and quality of life. That also includes fast recovery resulting in early reintegration into daily life and minimal socio-economic cost.
V. Justin Department of Surgery, Section for Surgical Research, Medical University of Graz, Graz, Austria
Klinik Donaustadt, Vienna Healthcare Group, Vienna, Austria e-mail: viktor.justin@gesundheitsverbund.at
S. Uranues (*) Department of Surgery, Section for Surgical Research, Medical University of Graz, Graz, Steiermark, Austria e-mail: selman.uranues@medunigraz.at
2.2 Historical Remarks
While surgical interventions date back millennia, modern surgery started with the onset of anaes­thesia and the rst ether narcosis in 1846 [1]. Almost at the same time, Semmelweis published his observations on puerperal fever leading to a new understanding of post-operative infections [2]. While Semmelweis was mainly ignored, fur­ther research by Pasteur, Koch and Lister led to the general use of antisepsis and consequently to the further improvement of surgical outcomes [3,
4]. The discovery of antimicrobial therapy was
another milestone for better surgical outcomes enabling major surgeries for all kinds of indi­cations [5]. Following decades of continuous development, the advent of minimally invasive procedures marked the next revolution in surgery. While the rst laparoscopy for diagnostic indica­tions was described in the early 1900s [6], its ther­apeutic use was only slowly implemented after several years of (at times erce) discussions in the 1980s, with laparoscopic appendectomy and cholecystectomy being the rst indications [7, 8]. Since then minimally invasive surgery (MIS) has gained wide use with the constant development of new technologies including reduced port sur­gery, which aims at a reduction in the number and size of the ports. The use of robotic techniques has led to an additional expansion of the arma­mentarium of the minimally invasive surgeons.
© The Author(s), under exclusive license to Springer Nature Switzerland AG 2021 O. N. Dilek et al. (eds.), Prophylactic Surgery, https://doi.org/10.1007/978-3-030-66853-2_2
15
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V. Justin and S. Uranues
2.3 Learning Curve inMinimally Invasive Surgery
Mastering a surgical skill requires time and intensive training, which can be described by a learning curve, a concept initially postulated in aviation. In surgery, talent is supplementary and does not replace training and experience [9]. While there is no strict denition, learning curves are usually drawn by comparing patient outcomes and/or measures of efciency (com­plications, duration of operations, rate of con­version, adequate oncological resection, etc.) to surgeon experience or case load [10]. While often wrongly used, a steep learning curve implies fast mastering of a procedure, while complex opera­tions need higher caseloads resulting in a lon­ger and gradually inclining curve. An acceptable standard is reached when a surgeon is able to perform the procedure independently and com­petently. From here on, further experience only slightly improves outcomes leading to a plateau that has to be maintained by a certain annual case load. Interestingly, a so-called secondary learning curve has been observed, describing a temporary decline in performance after a certain level has been reached. This may be explained by more complex cases, or overestimation of own competence and skill. Finally, a certain deterioration in performance may be observed with advancing age.
In a comparative study of individuals with­out surgical expertise, laparoscopic surgery was perceived to be more difcult to learn than open surgery [11]. To reach a stable skill level in MIS, about 30–80 cases as necessary for colorectal surgery, 80 cases for thoracoscopic anatomic lung segmentectomy and 150 cases in esopha­gectomy [10, 12, 13]. However, these numbers may vary substantially depending on pre-existing skills, annual case load and previous expertise. This can be illustrated by results for the imple­mentation of minimally invasive pancreatic sur­gery, where centres with high expertise in open surgery reported good results after a very short learning curve of ten cases, while centres with a low annual number of resections per surgeon had worse outcomes [1416]. Apart from pos-
sible short- and long-term morbidity, surgical complications may also have a signicant impact on psychosocial well-being even long after the operation [17].
Consequently, preventive minimally invasive surgery should not serve as a learning proce­dure and should only be undertaken by skilled surgeons who have mastered the learning curve for the respective indication and are performing these procedures on a regular basis.
2.4 Surgical Stress Response
By its very nature, surgery is invasive and as such triggers a surgical stress response that impacts a variety of organ systems (Fig. 2.1). Cortisol levels increase due to raised adrenal stimulation via adrenocorticotropic hormones (ACTH), resulting in immunomodulation and increased insulin resistance, and thus elevated glucose levels [18, 19]. The resulting post-oper­ative hyperglycaemia has been shown to be a signicant risk factor for surgical site infections and consequent morbidity [20]. Immunological changes leading to immunosuppression, such as a reduction of natural killer cell toxicity, and t-cell responses have been observed [21, 22]. Post-operative metabolism tends to increase cat­abolic characteristics with proteolysis especially affecting muscle tissue [23]. Apart from surgical trauma, other factors such as patient comorbidi­ties as well as the type of anaesthesia, including perioperative analgesia and uid support, may inuence stress response [18]. Concepts such as
fast-track surgery and enhanced recovery after surgery (ERAS) have been proposed to reduce
morbidity [2426]. While these should be incor­porated into clinical practice generally and in preventive indications specically, they will not be further discussed here.
MIS has been shown to reduce operative trauma signicantly. Post-operative cortisol levels are lower after minimally invasive sur­gery indicating a lower neuro-hormonal stress response [2729]. A randomized trial in patients undergoing lobectomy for peripheral broncho­genic carcinoma observed a signicantly lower
2 Minimally Invasive Procedures and Prophylactic Surgery
17
Fig. 2.1 Surgical stress response. (Adapted from [18] with permission from Elsevier)
Anesthesia
Regional
Perioperative
medication
vs. General
Surgical
trauma
Influenced i.a. by
approach modality:
vs. open
MIS
Surgical
stress
response
Neuroendocrine
Metabolic lmmunological Hematological
Preexisting
conditions
Diabetes, arterial hypertension etc.
grade of leucodepletion and a reduced degree of immunosuppression (as measured by T-helper cell depression and NK cell numbers) after video­assisted thoracic surgery (VATS) compared to open surgery [21]. Similar results in favour of minimal invasive surgery have been reported in several indications including oesophageal resec­tions [30], cholecystectomy [28], colorectal [31
33] and hepatic surgery [34].
2.5 Perioperative andShort-Term Outcomes
MIS usually yields longer operative times [35]. However this difference is often no longer than several minutes and seems to decrease with expe­rience [14]. Estimated blood loss has been shown to be signicantly lower both in laparoscopy and thoracoscopy [3540] Conversion rates to open surgery vary according to indications and patient selection criteria but generally lie around 10% and below in dedicated centres for visceral, tho­racic, gynaecological and urologic MIS [4143].
In laparoscopic pancreatic surgery however con­version rates up to 34% are still reported [14]. The risk of severe post-operative complications (Clavien-Dindo IIIb or higher) does not differ signicantly between open and minimally inva­sive surgery [44].
Post-operative pain has been reported to be lower after MIS [28, 45] as well as the rate of surgical site infections (SSI) [36, 45, 46]. A meta- analysis found that SSI can be reduced by 70–80% in obese patients when laparoscopy is employed [47]. The duration of hospital stays is shorter after MIS and leads to a quicker return to daily life [14, 35, 45, 48, 49].
2.6 Long-Term Outcomes
Long-term procedure–related complications depend on the respective primary operation. In abdominal surgery, formations of adhesions and subsequent bowel obstruction, as well as devel­opment of incisional hernia, are of major concern [50]. A review of more than 440,000 abdominal
18
ab
V. Justin and S. Uranues
operations showed a higher incidence of small bowel obstruction (SBO) after open cholecystec­tomy (7.1% vs. 0.2%), abdominal hysterectomy (15.6% vs. 0.0%) and adnexal operations (23.9% vs.0.0%) when compared to their laparoscopic “counterpart” [51]. Incisional hernia occurs in about 9.9% of cases after elective laparotomy (11% midline vs. 4.7% transverse incision; p = 0.006) and statistically is thus signicantly more often than in laparoscopy (0.7%; p=0.001) [52]. Apart from individual risk factors for inci­sional hernia such as obesity and smoking, a his­tory of SSI additionally increases the incidence of hernias.
While complications remain the most deci­sive factor for impaired post-operative quality of life, certain studies also indicate a higher post­operative QOL in minimally invasively operated individuals [5356].
In order to round up this chapter with a practi­cal example, applicable data from a meta- analysis from Tan etal. [57] will be utilized. A 38-year- old man, whose father died of colon cancer at age 40, has been tested positive for hereditary nonpol­yposis colorectal cancer (HNPCC). He has been
informed extensively and—nearing the age of his father’s diagnosis—desires prophylactic colec­tomy. He is physically active and healthy, with a history of hypertension on his medical record. Your institution is a dedicated high- volume lapa­roscopic colorectal centre. You schedule him for laparoscopic proctocolectomy with ileo-rectal J-pouch anastomosis with protective ileostomy closed after 6weeks.
The operation went as planned (Fig.2.2) and took 3.2 h, about 30 min longer than the open approach. Estimated intraoperative blood loss was 336 mL (as opposed to 412 mL in open surgery) and no blood products were needed. Bowel function recovered after 2days, an aver­age 2days earlier than after open surgery. He is one of 85% who do not develop an anastomotic leak and leaves the hospital after 6days (a mean of 2.6days earlier than he would have with open surgery). The small skin incision at the speci­men extraction site heals without complications (Fig.2.3). When you see him again after 6months, he reports 3–5 bowel movements per day with­out strong urgency. As you adhere to compliance policy at your institution, all he can give you is a
Fig. 2.2 Specimen after laparoscopic proctocolectomy: intraoperative (a) and back-table (b) view
2 Minimally Invasive Procedures and Prophylactic Surgery
Fig. 2.3 Two-year follow-up after laparoscopic proce­dure shown in Fig.2.2
big “thank you” and a rm handshake. And while this case may be idealized: Is not that what you would want for all your patients?
2.7 Conclusions
Given adequate resources and a high level of skill, minimally invasive surgery is the desirable approach in prophylactic indications. Operative trauma, post-operative pain and the risk of long­term complications (SBO, hernia) are reduced, while fewer surgical site infections and shorter length of hospital stay can be observed.
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