Orestis Ioannidis

Prof. Dr. Orestis Ioannidis

4th Academic Department of Surgery, School of Medicine, Faculty of Health Sciences, Aristotle University of Thessaloniki, Alexandrou Mihailidi 13, 54640 Thessaloniki, Greece
orcid

Research Focus & Metrics

Academic Career Length

18Years (2009-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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16 April 2018 in World Journal of Emergency Surgery
Verified
Journal Article
Open access
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Massimo SartelliMassimo Sartelli
Massimo Sartelli
GBGian Luca Baiocchi
Gian Luca Baiocchi
Salomone Di SaverioSalomone Di Saverio
Salomone Di Saverio
FFFrancesco Ferrara
Francesco Ferrara
FLFrancesco M. Labricciosa
Francesco M. Labricciosa
Fausto CatenaFausto Catena
Fausto Catena
Acute appendicitis (AA) is the most common surgical disease, and appendectomy is the treatment of choice in the majority of cases. A correct diagnosis is key for decreasing the negative appendectomy rate. The management can become difficult in case of complicated appendicitis. The aim of this study is to describe the worldwide clinical and diagnostic work-up and management of AA in surgical departments. This prospective multicenter observational study was performed in 116 worldwide surgical departments from 44 countries over a 6-month period (April 1, 2016–September 30, 2016). All consecutive patients admitted to surgical departments with a clinical diagnosis of AA were included in the study. A total of 4282 patients were enrolled in the POSAW study, 1928 (45%) women and 2354 (55%) men, with a median age of 29 years. Nine hundred and seven (21.2%) patients underwent an abdominal CT scan, 1856 (43.3%) patients an US, and 285 (6.7%) patients both CT scan and US. A total of 4097 (95.7%) patients underwent surgery; 1809 (42.2%) underwent open appendectomy and 2215 (51.7%) had laparoscopic appendectomy. One hundred eighty-five (4.3%) patients were managed conservatively. Major complications occurred in 199 patients (4.6%). The overall mortality rate was 0.28%. The results of the present study confirm the clinical value of imaging techniques and prognostic scores. Appendectomy remains the most effective treatment of acute appendicitis. Mortality rate is low.

1 January 2012 in World Journal of Emergency Surgery
Verified
Journal Article
Open access
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MSMassimo Sartelli
Massimo Sartelli
Fausto CatenaFausto Catena
Fausto Catena
LALuca Ansaloni
Luca Ansaloni
ALAri Leppaniemi
Ari Leppaniemi
KTKorhan Taviloglu
Korhan Taviloglu
JPJelena Petrovic
Jelena Petrovic
The CIAO Study (“C omplicated Intra-A bdominal infection O bservational” Study) is a multicenter investigation performed in 68 medical institutions throughout Europe over the course of a 6-month observational period (January-June 2012). Patients with either community-acquired or healthcare-associated complicated intra-abdominal infections (IAIs) were included in the study. 2,152 patients with a mean age of 53.8 years (range: 4–98 years) were enrolled in the study. 46.3% of the patients were women and 53.7% were men. Intraperitoneal specimens were collected from 62.2% of the enrolled patients, and from these samples, a variety of microorganisms were collectively identified. The overall mortality rate was 7.5% (163/2.152). According to multivariate analysis of the compiled data, several criteria were found to be independent variables predictive of patient mortality, including patient age, the presence of an intestinal non-appendicular source of infection (colonic non-diverticular perforation, complicated diverticulitis, small bowel perforation), a delayed initial intervention (a delay exceeding 24 hours), sepsis and septic shock in the immediate post-operative period, and ICU admission. Given the sweeping geographical distribution of the participating medical centers, the CIAO Study gives an accurate description of the epidemiological, clinical, microbiological, and treatment profiles of complicated intra-abdominal infections (IAIs) throughout Europe.

1 August 2017 in World Journal of Emergency Surgery
Verified
Journal Article
Open access
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MSMassimo Sartelli
Massimo Sartelli
FLFrancesco M. Labricciosa
Francesco M. Labricciosa
PBPAMELA BARBADORO
PAMELA BARBADORO
Leonardo PaganiLeonardo Pagani
Leonardo Pagani
LALuca Ansaloni
Luca Ansaloni
FCFausto Catena
Fausto Catena
Antimicrobial Stewardship Programs (ASPs) have been promoted to optimize antimicrobial usage and patient outcomes, and to reduce the emergence of antimicrobial-resistant organisms. However, the best strategies for an ASP are not definitively established and are likely to vary based on local culture, policy, and routine clinical practice, and probably limited resources in middle-income countries. The aim of this study is to evaluate structures and resources of antimicrobial stewardship teams (ASTs) in surgical departments from different regions of the world. A cross-sectional web-based survey was conducted in 2016 on 173 physicians who participated in the AGORA (Antimicrobials: A Global Alliance for Optimizing their Rational Use in Intra-Abdominal Infections) project and on 658 international experts in the fields of ASPs, infection control, and infections in surgery. The response rate was 19.4%. One hundred fifty-six (98.7%) participants stated their hospital had a multidisciplinary AST. The median number of physicians working inside the team was five [interquartile range 4–6]. An infectious disease specialist, a microbiologist and an infection control specialist were, respectively, present in 80.1, 76.3, and 67.9% of the ASTs. A surgeon was a component in 59.0% of cases and was significantly more likely to be present in university hospitals (89.5%, p < 0.05) compared to community teaching (83.3%) and community hospitals (66.7%). Protocols for pre-operative prophylaxis and for antimicrobial treatment of surgical infections were respectively implemented in 96.2 and 82.3% of the hospitals. The majority of the surgical departments implemented both persuasive and restrictive interventions (72.8%). The most common types of interventions in surgical departments were dissemination of educational materials (62.5%), expert approval (61.0%), audit and feedback (55.1%), educational outreach (53.7%), and compulsory order forms (51.5%). The survey showed a heterogeneous organization of ASPs worldwide, demonstrating the necessity of a multidisciplinary and collaborative approach in the battle against antimicrobial resistance in surgical infections, and the importance of educational efforts towards this goal.

15 July 2019 in World Journal of Emergency Surgery
Verified
Journal Article
Open access
PDF file
Massimo SartelliMassimo Sartelli
Massimo Sartelli
FAFikri M Abu-Zidan
Fikri M Abu-Zidan
FLFrancesco M. Labricciosa
Francesco M. Labricciosa
YKYoram Kluger
Yoram Kluger
ACand Federico Coccolini
and Federico Coccolini
Fausto CatenaFausto Catena
Fausto Catena
Timing and adequacy of peritoneal source control are the most important pillars in the management of patients with acute peritonitis. Therefore, early prognostic evaluation of acute peritonitis is paramount to assess the severity and establish a prompt and appropriate treatment. The objectives of this study were to identify clinical and laboratory predictors for in-hospital mortality in patients with acute peritonitis and to develop a warning score system, based on easily recognizable and assessable variables, globally accepted. This worldwide multicentre observational study included 153 surgical departments across 56 countries over a 4-month study period between February 1, 2018, and May 31, 2018. A total of 3137 patients were included, with 1815 (57.9%) men and 1322 (42.1%) women, with a median age of 47 years (interquartile range [IQR] 28–66). The overall in-hospital mortality rate was 8.9%, with a median length of stay of 6 days (IQR 4–10). Using multivariable logistic regression, independent variables associated with in-hospital mortality were identified: age > 80 years, malignancy, severe cardiovascular disease, severe chronic kidney disease, respiratory rate ≥ 22 breaths/min, systolic blood pressure < 100 mmHg, AVPU responsiveness scale (voice and unresponsive), blood oxygen saturation level (SpO2) < 90% in air, platelet count < 50,000 cells/mm3, and lactate > 4 mmol/l. These variables were used to create the PIPAS Severity Score, a bedside early warning score for patients with acute peritonitis. The overall mortality was 2.9% for patients who had scores of 0–1, 22.7% for those who had scores of 2–3, 46.8% for those who had scores of 4–5, and 86.7% for those who have scores of 7–8. The simple PIPAS Severity Score can be used on a global level and can help clinicians to identify patients at high risk for treatment failure and mortality.

10 July 2017 in Frontiers in Surgery
Verified
Journal Article
Open access
OIOrestis Ioannidis
Orestis Ioannidis
LKLoukiani Kitsikosta
Loukiani Kitsikosta
Dimitris TatsisDimitris Tatsis
Dimitris Tatsis
ISIoannis Skandalos
Ioannis Skandalos
ACAggeliki Cheva
Aggeliki Cheva
KTKonstantinos George Tsalis
Konstantinos George Tsalis
Background: Fournier’s gangrene is a rapidly evolving necrotizing fasciitis of the perineum and the genital area, the scrotum as it most commonly affects man in the vast majority of cases. It is polymicrobial in origin, due to the synergistic action of anaerobes and aerobes and has a very high mortality. There are many predisposing factors including diabetes mellitus, alcoholism, immunosuppression, renal and hepatic disease. The prognosis of the disease depends on a lot of factors including but not limited to patient age, disease extent and comorbidities. Methods: The current retrospective study is presenting the experience of our general surgery department in the management of Fournier’s gangrene during the last 20 years. The clinical presentation and demographics of the patients were recorded. Also we recorded the laboratory data, the comorbidities, the etiology and microbiology and the therapeutic interventions performed and we calculated the various severity indexes. Patients were divided to survivors and non survivors and all the collected data were statistically analyzed in order to assess mortality factors using univariate and then multivariate analysis. Results: In our series we treated a total of 24 patients with a mean age 58.9 years including 20 males (83.4%) and 4 females (16.6%). In most patients a delay between disease onset and seeking of medical help was noted. Comorbidities were present in almost all patients (87.5%) All patients were submitted to extensive surgical debridements and received broad spectrum antibiotics until microbioligal culture results were received. Regarding all the collected data there was no statistically significant difference between survivors and non survivors except the presence of malignancy in non survivors (p=0.036) and the lower hemoglobin (p<0.001) and hematocrit (p=0.002) in non survivors. However, multivariate analysis didn’t reveal any predictor of mortality. Conclusion: In conclusion, early diagnosis, aggressive thorough surgical treatment and administration of the proper antibiotic treatment comprise the cornerstone for the outcome of this disease. In small populations like in the present study it is difficult to recognize any predictors of mortality and even the severity indexes which take into account a lot of data cannot predict mortality.

24 May 2022 in The Lancet Global Health
Verified
Journal Article
Open access
CSCatherine A Shaw
Catherine A Shaw
RPRiinu Pius
Riinu Pius
TDThomas M Drake
Thomas M Drake
LNLisa Norman
Lisa Norman
AAAdesoji O Ademuyiwa
Adesoji O Ademuyiwa
JLJean Wilguens Lartigue
Jean Wilguens Lartigue
Early death after cancer surgery is higher in low-income and middle-income countries (LMICs) compared with in high-income countries, yet the impact of facility characteristics on early postoperative outcomes is unknown. The aim of this study was to examine the association between hospital infrastructure, resource availability, and processes on early outcomes after cancer surgery worldwide. A multimethods analysis was performed as part of the GlobalSurg 3 study—a multicentre, international, prospective cohort study of patients who had surgery for breast, colorectal, or gastric cancer. The primary outcomes were 30-day mortality and 30-day major complication rates. Potentially beneficial hospital facilities were identified by variable selection to select those associated with 30-day mortality. Adjusted outcomes were determined using generalised estimating equations to account for patient characteristics and country-income group, with population stratification by hospital. Between April 1, 2018, and April 23, 2019, facility-level data were collected for 9685 patients across 238 hospitals in 66 countries (91 hospitals in 20 high-income countries; 57 hospitals in 19 upper-middle-income countries; and 90 hospitals in 27 low-income to lower-middle-income countries). The availability of five hospital facilities was inversely associated with mortality: ultrasound, CT scanner, critical care unit, opioid analgesia, and oncologist. After adjustment for case-mix and country income group, hospitals with three or fewer of these facilities (62 hospitals, 1294 patients) had higher mortality compared with those with four or five (adjusted odds ratio [OR] 3·85 [95% CI 2·58–5·75]; p<0·0001), with excess mortality predominantly explained by a limited capacity to rescue following the development of major complications (63·0% vs 82·7%; OR 0·35 [0·23–0·53]; p<0·0001). Across LMICs, improvements in hospital facilities would prevent one to three deaths for every 100 patients undergoing surgery for cancer. Hospitals with higher levels of infrastructure and resources have better outcomes after cancer surgery, independent of country income. Without urgent strengthening of hospital infrastructure and resources, the reductions in cancer-associated mortality associated with improved access will not be realised. National Institute for Health and Care Research.