conservative therapy ranges from parenteral nutrition , gastric drainage , and antibiotics to interventional techniques such as implantation of covered stents and closure with clips .
esophageal stenting or clipping of esophageal leaks often has to be combined with simultaneous external drainage 1 
 2 .
endoscopic vacuum therapy ( evt ) has been reported as a novel treatment option for esophageal leakage 3 
 4 .
most retrospective studies of the technology summarize heterogeneous cases of anastomotic insufficiency and spontaneous and iatrogenic perforation 5 
 6 
 7 
 8 
 9 
 10 
 11 .
we gained experience with evt since 2005 and the aim of this paper is to present our results in treatment of iatrogenic perforation of the esophagus in a series of 10 patients .
between 2007 and 2014 , 10 patients from our clinic were found to have iatrogenic perforation caused by endoscopic procedures ( 7 male/3 females ) , aged 28 to 82 years . since 2007 ,
open pore drainage consisting of a gastric tube and open pore polyurethane foam ( v.a.c .
, san antonio , usa ; endo - sponge , b. braun melsungen ag , melsungen , germany ; suprasorbcnp wundschaum , lohmann  &  rauscher gmbh  &  co. kg , neuwied , germany ) was used for therapy .
the foam fixed at the tip of the tube was placed solely by endoscopic means with a grasper ( fig .  1  a , fig .  2  a ) .
the open pore foam adheres to the tissue when connected with an electronic vacuum device ( kci v.a.c .
freedome , kci usa inc . , san antonio , texas , usa , setting : 125  mmhg , continuous , intensity 10 ) .
intraluminal ( il ) and intracavitary ( ic ) variants of therapy have been described previously in detail 12 .
open pore polyurethane foam ( pu ) fixed at tip of drainage tube ( t ) , endoscope ( e ) , grasper ( g ) , b open pore drainage
. left : short polyurethane foam ( pu ) for intracavitary evt ; right : long pu for intraluminal evt ; endoscope ( e ) ; drainage tube ( t ) . 

esophageal placement of open pore drainage ( polyurethane foam [ pu ] , suture [ s ] , drainage tube [ t ] , grasper [ g ] .
b after 2 days of intracavitary evt ( wound edges [ we ] of perforation defect ) .
c after 3 days of intraluminal evt ( wound edges [ we ] stick together ) .
d 8 days after a 5-day treatment with evt ( erosion pattern has disappeared and a tiny scar [ sc ] is the residuum of the perforation defect [ esophageal lumen { l } ] ) .
otherwise , the open pore foam was placed directly intraluminally onto the epithelium of the esophagus covering the perforation area .
contamination of the wound with gastric fluids and saliva was eliminated . wound secretion and edema
b after application of vacuum suction , the esophageal lumen collapses around and with the open pore foam .   for intraluminal evt , we used foam that measured of 1.5 to 2  cm in diameter and up to 12  cm in length . for intracavitary placement ,
the tube exited nasally and , if necessary , a nasolabial suture was placed to prevent dislocation .
drainage was removed orally in the first 2 to 5 days simply by withdrawing the tube to allow endoscopic inspection of the inner wound .
if the area of perforation was free of inflammation and granulation closed or covered the inner wound , the therapy was discontinued .
when endoscopic control showed regular intracorporeal wound healing , a patient was started on a soft diet .
after completion of vacuum therapy , follow - up endoscopies were performed to monitor the healing process .
all perforations were diagnosed endoscopically in median time on the same day or within 24 hours after a perforation event .
esophageal perforations were located from the cricopharyngeus ( 4 out of 10 ) to the esophagogastric junction ( 2 out of 10 ) .
eight patients were treated with intraluminal evt ( il ) , one with intracavitary evt ( ic ) and one patient with both types of treatment ( conversion from intracavitary to intraluminal therapy)(video 1 ) .  
after removal of the foam , epithelial tissue that had come into contact with it during evt showed a typical pimpled erosion pattern ( fig . 
2  d ) . in some patients , we observed open pores obstructed partly by viscous saliva or slime .
six of the 10 patients were ventilated during the treatment period , four of them only during the placement procedures .  

systemic antibiotics were given in eight cases but as shown in the table , there were no ventilation - associated morbidities .
no dilation of defects no ventilation - associated problems surgical therapy of ulcus ventriculi bleeding clinically asymptomatic patient did not consent to follow - up endoscopy . in all patients
treated with intraluminal evt , the wound edges were found to be closed on the first control endoscopy ( fig . 
one asymptomatic patient did not consent to follow - up endoscopy . in all 10 patients ( 100  % ) , the perforation leakages were healed in a median of 5 ( 3    7 ) days after administration of evt .
no extra endoscopic intervention ( clip , stent ) or other surgical procedures were necessary .
the healing process was closely monitored by control endoscopy ; a second cycle of evt was not necessary in any of the patients .
in contrast to anastomotic insufficiency , sudden transmural injury results in a localized inflammation in cases of early iatrogenic perforation .
but if saliva , gastric , and choline secretions or infective fluids are brought into continuous contact with extraluminal tissue through the perforation due to the physiologic intrathoracic negative pressure , development of mediastinitis can be promoted . in our limited series
, we were able to start evt immediately after diagnosis within 24 hours after a perforation event .
recent studies with evt show a success rate of 85  % to 95  % for use of the approach to treat esophageal anastomotic insufficiencies and perforations in more than 120 patients 7 
 8 
 9 
 10 
 11 
 12 .
endoscopic stenting for sealing esophageal leaks is an established method with over 20 years of clinical experience .
however , in six of our patients , perforations were located either ciropharyngeal or near the esophagogastric junction . in those locations ,
limitations of stent therapy have been described , due to dislocation , migration , persisting leakage and foreign body sensation 13 .
we suppose that stenting would not have been an optimal treatment in these cases . to date , two studies comparing stenting with evt both have suggested that evt has an advantage over use of stents in terms of outcomes for sealing esophageal leaks 9 
 10 .  
few published reports exist about experience with closure of early - detected esophageal perforation use the over - the - scope - clip method .
the procedure seems to be successful but also appears to be associated with considerable risks 14 .
we suspect that our short treatment duration ( median 5 days ) and success rate of 100  % also depends on the parameters of the negative pressure we use .
two technical prerequisites exist for evt : open pore drainage and negative pressure . based on our experience with the technology
, we believe that it is important to ensure the best suction effect and adherence of the foam within tissue -specific parameters .
permanent suction works with multiple open pores , even if some of them may be obstructed .
since we began performing evt on the esophagus in 2006 , we have continued to successfully use the same electronic device .
we assume that these modern devices may be not suitable for evt in the esophagus .   in 2008
intraluminal vacuum application resulted in occlusion of the esophagus lumen and contraction of adjacent tissue .
the procedure was easy to perform and feasible in nine of 10 patients with iatrogenic perforation .
we have observed that swallowing viscous saliva can result in blockage of open pores in the foam .
our observations suggest , however , that the blockage was not complete and that drainage was still effective .
however , blockage of the foam may increase risk that the vacuum will be ineffective .
therefore , we recommend routine endoscopic examination of patients undergoing evt 3 days after the procedure or in case of any irregular symptoms .  
surgical monitoring following evt is the same as after any other superficial surgical procedure : inspection of the wound is necessary to supervise wound healing .  
six of the patients in our series were ventilated during the treatment period to avoid swallowing of saliva and to ensure effective suction of tissue .
this might be one of the disadvantages of evt , yet in our series , we did not observe any comorbidities caused by the short periods of ventilation .   because the duration of treatment with evt was short , all of the patients in our series received parenteral nutrition . in cases of anastomotic insufficiency , because the treatment duration was significantly longer , we use adapted feeding tubes 5 .  
because none of the patients required external thoracic drainage , it appears that by combining evacuation and a sealing effect , evt resulted in sufficient drainage in all cases .
the advantages of evt are its easy application throughout the whole length of the esophagus from the cricopharyngeus to the esophagogastric junction and the ability to simultaneously close and promote internal drainage in one endoscopic step .  the treatment period is short and no complications have been observed .  
our study suggests that evt will play an important role in endoscopic management of all types of esophageal perforation .
 
 background and study aims : endoscopic vacuum therapy ( evt ) has been reported as a novel treatment option for esophageal leakage . 
 we present our results in the treatment of iatrogenic perforation with evt in a case series of 10 patients . 
 patients and methods : an open pore polyurethane drainage was placed either intracavitary through the perforation defect or intraluminal covering the defect zone . 
 application of vacuum suction with an electronic device ( continuous negative pressure , 125  mmhg ) resulted in defect closure and internal drainage . 
 
 results : esophageal perforations were located from the cricopharyngeus ( 4/10 ) to the esophagogastric junction ( 2/10 ) . evt was feasible in all patients . 
 eight patients were treated with intraluminal evt , one with intracavitary evt , and one with both types of treatments . 
 all perforations ( 100  % ) were healed in within a median of ( 3    7 ) days . 
 no stenosis occurred , no complications were observed , and no additional operative treatment was necessary . 
 
 conclusions : our study suggests that intraluminal evt will play an important role in endoscopic management of esophageal perforation . 
Introduction
Patients and methods
Results
Discussion