Ever since the Romans 2000 years ago the management of hernia surgery has remained a challenge to surgeons. Modern groin hernia treatment started with the Italian, Eduardo Bassini, around 1890 when he presented his method of repair. The most important innovations after Bassini are the Shouldice repair and introduction of prosthetic materials.
The last century has witnessed a continuous gap between, on the one hand excellent results repmted from dedicated hernia centres, and on the other outcome following hernia surgery in general surgical practice, in Sweden and elsewhere. One obstacle to quality assessment is the magnitude of hernia surgery. It is the most commonly performed procedure in Swedish general surgical practice with an incidence of around 17,000 to 20,000 repairs annually.
In 1992 a national quality register for hernia surgery was started, the Swedish Hernia Register (SHR). The general aim of this thesis is to study to what extent a quality register can be used for describing and analysing hernia surgery and can serve as a tool in the improvement process in non-specialised hospitals. Prospectively registered data in the SHR from 1992 to 1998 are the source of information for the six papers included.
The number of units participating in the SHR has increased from eight in 1992 to 65 in 2001, covering approximately 80% of units performing hernia surgery in Sweden. In January 2001 the database comprised almost 50,000 hernia repairs. Coverage of hernia operations in the SHR among participating units was high, 98%. Register participation, per se, improved the outcome of hernia surgery at aligned units during the early phase of the SHR.
In the studies forming the basis of this thesis we found that the use of mesh increased from 6 to 61% from 1992 to 1996-1998 and that the cumulative incidence of reoperation for recurrence decreased significantly during the same period. Recurrent hernia, absorbable suture, direct hernia and postoperative complication were identified as factors carrying an enhanced risk for reoperation.
SHR data show that femoral hernia is more common in females and associated with an enhanced risk for emergency operation. Mortality within 30 days of surgery, for men, was lower than that of the background population after elective inguinal hernia repair but increased after emergency operations, especially if bowel resection was undertaken.
Recurrent groin hernia still constitutes a significant quantitative problem for the surgical community, 15% of all repairs registered in 1996-1998 being repairs for recurrence. Anterior mesh repair according to Lichtenstein and laparoscopic methods were associated with a lower risk for reoperation following recurrent hernia repair.
In one hospital cohort from 1994, the recurrence rate was 10.5-14.6% 44 months after surgery, exceeding the reoperation rate by 1.7-2.3 times depending on definition of recurrence and method of follow-up. Fifteen per cent of patients in this cohort had pain related to previous hernia surgery, pain intensity being moderate or severe in 5 % of all patients followed-up.
The SHR, with reoperation as its main endpoint, may be used to describe and analyse hernia surgery and to stimulate local improvement. It has to be supplemented by questionnaire and/or physical examination in order to estimate rates of recurrence and chronic pain.
Linköping: Linköpings universitet , 2001. , 83 p.
2001-09-21, Berzeliussalen, Universitetssjukhuset, Linköping, 09:00 (Swedish)