This study is prospective randomized trial enrolling at least 100 participants which compares efficacy and safety of two alternative methods of laparoscopic hiatal repair for large (i.e. with hiatal surface area (HSA) ranging from 10 to 20 sq.cm, which corresponds to diameter of defect from 5 to 8 cm) types I, II, and III hiatal hernias: primary crural repair and repair with partially absorbable lightweight mesh. According to the literature, rates of anatomical failure and recurrence of GERD after primary repair of large hiatal hernias reach 42 %. Mesh repair decreases rates of failures, however, polypropylene and composite PTFE meshes used most widely, result in unacceptable rates of long-term dysphagia and oesophageal strictures. Our own experience of more than 400 repairs using partially absorbable lightweight mesh Ultrapro (Ethicon) and original sub-lay technique of its fixation precluding contact of the mesh with the oesophagus, showed low recurrence rate and a few cases of long-term dysphagia. Thus, final conclusions could be established by prospective randomized study. Our hypothesis is: original technique of lightweight mesh repair is highly effective for prevention of recurrences compared to primary repair and safe in terms of mesh-related dysphagia and oesophageal strictures. The long-term results (24 months post surgery for every patient) will be studied using symptom questionnaires, quality of life and satisfaction questionnaires, barium studies, endoscopic examinations, 24-hour pH testing, and analysis of possible reoperations.

Methods of laparoscopic repair of large and giant hiatal hernias are the most challenging questions in gastrointestinal minimally invasive surgery. The literature demonstrates high rates of anatomical and functional recurrence after laparoscopic repair of large hiatal hernias, particularly following primary crural repair. Different methods of mesh repair were introduced and several trials showed their benefits. However, necessity and method of prosthetic repair remain questionable as mesh repair results in high frequency of long-term dysphagia and oesophageal strictures.

There is insufficient grade 1 evidence for choice of optimal method of repair of large hiatal hernias. Only 3 prospective randomized trials comparing prosthetic and primary hiatal repair were published by Frantzides et al (2002), Granderath et al (2005), and Oelschlager et al (2006). However, these trials could not recommend effective, safe, and relatively inexpensive method of repair. Although Frantzides et al (2002) showed statistically significant decrease of recurrence rate in composite (ePTFE) mesh arm, the study included only patients with diameter of defect 8 cm and greater, thus it is still unknown whether mesh should be used for hernias with smaller diameter of hernia defect, for example, between 5 and 8 cm. Most specialists use mesh when the diameter of the defect is just greater than 5 cm, based on their own experience and widespread literature data, including studies of Champion et al (1998, 2003). In addition, hiatal surface area (HSA), first described by Granderath et al (2007), is more sensitive measure than diameter of hiatal hernia defect, and further trials should focus on it. Finally, ePTFE prosthesis is rather expensive.

The trial of Granderath et al (2005) also was not primarily focused of relation between diameter of hernia defect and rate of recurrences. In this study, recurrence rate was also smaller in the polypropylene arm, but the rate of dysphagia was lager in the same arm. Although later these authors reported that differences between arms in rates of dysphagia and motility disorders vanished in 1 year, most of authors still consider polypropylene mesh potentially unsafe (Frantzides et al, 2010).

To remove the risk of mesh-related oesophageal complications, biological prostheses were introduced for hiatal repair, but the study of Oelschlager et al (2006) demonstrated insignificant difference in recurrence rates in prosthesis arm compared to primary repair arm, although no cases of mesh-related complications were observed in prosthesis arm. Data from the literature and international congresses suggest that biological devices cannot be widely used in the setting of large hiatal hernias due to high rate of recurrences and their high price. Data from another recent numerous publications including reviews made the same conclusions that large and giant hiatal hernias require mesh repair but search for the optimal prosthesis and fashion of its fixation is ongoing.

Hiatal repair by partially absorbable lightweight meshes is promising technique and may become an optimal because it can minimize both recurrences and oesophageal complications. Hazebroek et al (2008) reported good functional, endoscopic, and radiological outcomes in terms of esophageal complications after on-lay placement of titanium-coated lightweight polypropylene mesh (non-randomized prospective study). Our own experience of 400 repairs using lightweight mesh (Ultrapro, Ethicon) and original sub-lay technique of its fixation precluding contact of the mesh with the oesophagus, showed low recurrence rate (4,9%) and a few cases of long-term dysphagia (2,1%). Therefore, the hypothesis of our double-blind prospective randomized trial is: original technique of lightweight mesh (Ultrapro, Ethicon) repair is highly effective for prevention of recurrences compared to primary repair and safe in terms of mesh-related dysphagia and oesophageal strictures.

The study will enroll at least 100 patients with large (i.e. with hiatal surface area (HSA) ranging from 10 to 20 sq.cm, which corresponds to diameter of defect from 5 to 8 cm) types I, II, and III hiatal hernias. The chosen size of the defect is the most questionable in terms of the need for applying a mesh: when HSA is 20 sq.cm or greater the necessity of mesh repair is obvious, when it is less than 10 sq.cm usage of mesh is unreasonable. The basic eligibility criteria will be: absence of oesophageal motility disorders, absence of oesophageal shortening requiring Collis procedure, absence of peptic strictures and other factors that may independently influence the rate of recurrence and dysphagia/oesophageal strictures. Thus, the only difference between arms will be method of hiatal closure. To exclude fundoplication-related bias, standard floppy-Nissen procedure will be performed in every patient.

Every patient will be operated by single surgical team with an experience of more than 1500 laparoscopic anti-reflux procedures since 1998. The necessary ethic regulations will be saved including informed consent with the statement that patient is unaware of the method of repair (double-masked). Every patient is going to be evaluated preoperatively, 6 months, and 24 months postoperatively using symptom questionnaires, quality of life and satisfaction questionnaires, barium studies, endoscopic examinations, and 24-hour pH testing. For issue of efficacy of prosthetic repair, recurrence rate of hernia and GERD, which are the primary outcome measure, will be studied. For issue of safety of prosthetic repair, rates of short- and long-term dysphagia/oesophageal strictures/mesh erosions, which are main secondary outcome measure, will be evaluated.

Inclusion Criteria:

• Type I, II and III hiatal hernias, including complicated by GERD
• Able to undergo elective laparoscopic hiatal hernia repair
• Able to 24 months follow-up with office examinations
• Hiatal surface area (HSA) measuring 10 to 20 sq.cm (by granderath et al, 2007) which correspond to the diameter of hernia defect measuring 5 to 8 cm (the distinct size is determined intraoperatively, those with smaller or larger diameter will be excluded from the study)

Exclusion Criteria:

• Unable to undergo laparoscopic hiatal hernia repair due to: severe comorbidities (ASA III and more), previous major surgery with severe adhesions, etc.
• Cases of conversion to open surgery
• Age < 20 years and > 80 years
• BMI < 16 and > 39 kg/m2
• Pregnancy or plans for pregnancy within next 2 years (in females)
• Uncorrectable coagulopathy and immunosuppression
• Oesophageal motility disorders
• Oesophageal peptic strictures
• Oesophageal diverticula, other types (i.e. non-reflux) of chronic esophagitis, connective tissue disorders (e.g. scleroderma)
• Oesophageal shortening (determined intraoperatively as inability to achieve intra-abdominal length of oesophagus at least 3 cm in spite of intramediastinal oesophageal mobilization)
• Barrett's oesophagus
• History of oesophageal/gastric/duodenal surgery including vagotomy
• Relapsing course of ulcer disease/hyperacid gastritis including complicated by delayed gastric/duodenal emptying