Ioannis Baloyiannis

Prof. Ioannis Baloyiannis

orcid

Research Focus & Metrics

Academic Career Length

20Years (2007-Present)

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

Representative Publications

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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.

26 July 2024 in Scientific Reports
Verified
Journal Article
Open access
PDF file
EBEffrosyni Bompou
Effrosyni Bompou
AVAikaterini Vassiou
Aikaterini Vassiou
IBIoannis Baloyiannis
Ioannis Baloyiannis
KPKonstantinos Perivoliotis
Konstantinos Perivoliotis
IFIoannis Fezoulidis
Ioannis Fezoulidis
GTGeorge Tzovaras
George Tzovaras
The aim of this study is to compare the diagnostic performance of magnetic resonance imaging (MRI) against computed tomography (CT) in various aspects of local staging in colon cancer patients. This study was a prospective single arm diagnostic accuracy study. All consecutive adult patients with confirmed colon cancer that met the current criteria for surgical resection were considered as eligible. Diagnostic performance assessment included T (T1/T2 vs T3/T4 and < T3ab vs > T3cd) and N (N positive) staging, serosa and retroperitoneal surgical margin (RSM) involvement and extramural vascular invasion (EMVI). Imaging was based on a 3 Tesla MRI system and the evaluation of all sequences (T1, T2 and diffusion-weighted imaging-DWI series) by two independent readers. CT scan was performed in a 128 row multidetector (MD) CT scanner (slice thickness: 1 mm) with intravenous contrast. Pathology report was considered as the gold standard for local staging. Sensitivity (SE), specificity (SP), and area under the curve (AUC) were calculated for both observers. MRI displayed a higher diagnostic performance over CT in terms of T1/T2 vs T3/T4 (SE: 100% vs 83.9%, SP: 96.6% vs 81%, AUC: 0.825 vs 0.983, p < 0.001), N positive (p < 0.001) and EMVI (p = 0.023) assessment. An excellent performance of MRI was noted in the T3ab vs T3cd (CT AUCReader1: 0.636, AUCReader2: 0.55 vs MRI AUCReader1: 0.829 AUCReader2 0.846, p = 0.01) and RSM invasion diagnosis. In contrast to these, MRI did not perform well in the identification of serosa invasion. MRI had a higher diagnostic yield than CT in several local staging parameters.

5 December 2018 in International Journal of Colorectal Disease
Verified
Journal Article
Closed access
PDF file
KPKonstantinos Perivoliotis
Konstantinos Perivoliotis
CSChamaidi Sarakatsianou
Chamaidi Sarakatsianou
SGStavroula Georgopoulou
Stavroula Georgopoulou
GTGeorge Tzovaras
George Tzovaras
IBIoannis Baloyiannis
Ioannis Baloyiannis

1 December 2020 in Free Radical Biology and Medicine
Verified
Journal Article
Closed access
Konstantinos PapanikolaouKonstantinos Papanikolaou
Konstantinos Papanikolaou
AVAristidis S. Veskoukis
Aristidis S. Veskoukis
DDDimitrios Draganidis
Dimitrios Draganidis
IBIoannis Baloyiannis
Ioannis Baloyiannis
CDChariklia K. Deli
Chariklia K. Deli
IFIoannis G. Fatouros
Ioannis G. Fatouros

9 December 2019 in Techniques in Coloproctology
Verified
Journal Article
Closed access
PDF file
IBIoannis Baloyiannis
Ioannis Baloyiannis
KPKonstantinos Perivoliotis
Konstantinos Perivoliotis
ADA. Diamantis
A. Diamantis
GTG. Tzovaras
G. Tzovaras

4 March 2020 in Langenbeck's Archives of Surgery
Verified
Journal Article
Closed access
PDF file
KPKonstantinos Perivoliotis
Konstantinos Perivoliotis
IBIoannis Baloyiannis
Ioannis Baloyiannis
CSChamaidi Sarakatsianou
Chamaidi Sarakatsianou
GTGeorge Tzovaras
George Tzovaras