Dimitrios Papakonstantinou

Dr. Dimitrios Papakonstantinou

University General Hospital Attikon, Athens, Attikí, Greece
orcid

Research Focus & Metrics

Academic Career Length

9Years (2018-Present)

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

Representative Publications

View All Publications
3 September 2022 in Journal of Hepatocellular Carcinoma
Verified
Journal Article
Open access
PDF file
DPDimitrios Papakonstantinou
Dimitrios Papakonstantinou
DTDiamantis I Tsilimigras
Diamantis I Tsilimigras
Tim PawlikTim Pawlik
Tim Pawlik
Hepatocellular carcinoma (HCC) is the third most common cause of cancer-related deaths worldwide with the incidence of recurrence being as high as 88% even among patients who have undergone curative-intent treatment. Despite improvements in overall survival, recurrence remains a challenge necessitating accurate reappraisal of patient and disease status. To that end, accurate staging of recurrent HCC is a necessity to provide better care for these patients. Risk factors for poor survival after HCC recurrence have been identified and include characteristics of the primary disease, such as tumor multifocality, large size (≥ 5 cm), macroscopic vascular or microscopic lymphovascular invasion, preoperative a-fetoprotein (AFP) levels, R0 resection, and the presence of impaired liver function. Close surveillance with imaging is warranted following curative-intent therapy, with magnetic resonance imaging (MRI) being the preferred approach to identify small, early recurrent HCCs. Treatment decisions at the time of recurrence involve ruling out extrahepatic disease and identifying candidates for potentially curative-intent repeat treatment options. Patients with recurrent disease are, however, very diverse in terms of tumor morphology and biologic behavior, as well as residual hepatic functional reserve. Patients with preserved liver function may benefit from repeat liver resection or ablation. Patients with recurrence within the Milan criteria may even be candidates for salvage liver transplantation, while multimodality treatment with combination of liver-directed therapies appears to enhance oncologic outcomes for individuals with advanced recurrent disease. A “one-size-fits-all” approach in staging recurrent HCC does not exist. Rather, individualized and evidence-based decision-making is necessary in order to optimize outcomes for patients with recurrent HCC.

20 March 2020 in Diseases of the Esophagus
Verified
Journal Article
Closed access
PDF file
DPDimitrios Papakonstantinou
Dimitrios Papakonstantinou
KVKonstantina Vretakakou
Konstantina Vretakakou
APAnna Paspala
Anna Paspala
EMEvangelos P Misiakos
Evangelos P Misiakos
ACAnestis Charalampopoulos
Anestis Charalampopoulos
EPEmmanouil Pikoulis
Emmanouil Pikoulis
Summary: Esophageal cancer is characterized by profound changes in body composition due to dysphagia and generalized cachexia. Sarcopenia or muscle wasting is a component of cachexia associated with poor postoperative performance status. The skeletal muscle index (SMI) calculated by computed tomography scans at the level of the third lumbar vertebra is an easily quantifiable and reproducible measure of sarcopenia. The aim of this meta-analysis is to investigate the impact of preoperative sarcopenia (low SMI) on postoperative complications after esophagectomy for neoplastic lesions. In this context, a comprehensive literature search was undertaken to identify studies reporting short-term postoperative outcomes in relation to their preoperative SMI values. Cumulative risk ratios (RR) and risk differences (RD) and their respective 95% confidence intervals (CIs) were calculated using a random-effect model. A total of 11 studies incorporating 1,979 total patients (964 patients with sarcopeniaversus 1,015 without sarcopenia) were included in the final analysis. The results demonstrated a significant increase in overall morbidity (RR 1.16, 95% CI 1.01–1.33), respiratory complications (RR 1.64, 95% CI 1.21–2.22) and anastomotic leaks (RR 1.39, 95% CI 1.10–1.76) in patients with sarcopenia. No statistically significant difference was noted in overall mortality (RD 0, 95% CI −0.02–0.02) or Clavien–Dindo grade III or greater complications (RR 1.17, 95% CI 0.96–1.42). The above results demonstrate the validity of the SMI as a predictive factor for post-esophagectomy complications. Although the risk associated with sarcopenia is not prohibitive for surgery, patients with low SMI require closer vigilance during their postoperative course due to the increased propensity for respiratory and anastomotic complications.

25 May 2020 in Hernia
Verified
Journal Article
Closed access
PDF file
DPDimitrios Papakonstantinou
Dimitrios Papakonstantinou
ZGZ. Garoufalia
Z. Garoufalia
SKS. Kykalos
S. Kykalos
CNC. Nastos
C. Nastos
DTD. Tsapralis
D. Tsapralis
DSD. Schizas
D. Schizas

1 February 2021 in Surgery
Verified
Journal Article
Closed access
CNConstantinos Nastos
Constantinos Nastos
DPDimitrios Papakonstantinou
Dimitrios Papakonstantinou
EKEfstratios Kofopoulos-Lymperis
Efstratios Kofopoulos-Lymperis
MPMelpomeni Peppa
Melpomeni Peppa
APAndreas Pikoulis
Andreas Pikoulis
EPEmmanouil Pikoulis
Emmanouil Pikoulis

16 December 2022 in World Journal of Emergency Surgery
Verified
Journal Article
Open access
PDF file
Belinda De SimoneBelinda De Simone
Belinda De Simone
FAFikri M. Abu-Zidan
Fikri M. Abu-Zidan
ECElie Chouillard
Elie Chouillard
SSSalomone Di Saverio
Salomone Di Saverio
MSMassimo Sartelli
Massimo Sartelli
Fausto CatenaFausto Catena
Fausto Catena
Background: The incidence of the highly morbid and potentially lethal gangrenous cholecystitis was reportedly increased during the COVID-19 pandemic. The aim of the ChoCO-W study was to compare the clinical findings and outcomes of acute cholecystitis in patients who had COVID-19 disease with those who did not. Methods: Data were prospectively collected over 6 months (October 1, 2020, to April 30, 2021) with 1-month follow-up. In October 2020, Delta variant of SARS CoV-2 was isolated for the first time. Demographic and clinical data were analyzed and reported according to the STROBE guidelines. Baseline characteristics and clinical outcomes of patients who had COVID-19 were compared with those who did not. Results: A total of 2893 patients, from 42 countries, 218 centers, involved, with a median age of 61.3 (SD: 17.39) years were prospectively enrolled in this study; 1481 (51%) patients were males. One hundred and eighty (6.9%) patients were COVID-19 positive, while 2412 (93.1%) were negative. Concomitant preexisting diseases including cardiovascular diseases (p < 0.0001), diabetes (p < 0.0001), and severe chronic obstructive airway disease (p = 0.005) were significantly more frequent in the COVID-19 group. Markers of sepsis severity including ARDS (p < 0.0001), PIPAS score (p < 0.0001), WSES sepsis score (p < 0.0001), qSOFA (p < 0.0001), and Tokyo classification of severity of acute cholecystitis (p < 0.0001) were significantly higher in the COVID-19 group. The COVID-19 group had significantly higher postoperative complications (32.2% compared with 11.7%, p < 0.0001), longer mean hospital stay (13.21 compared with 6.51 days, p < 0.0001), and mortality rate (13.4% compared with 1.7%, p < 0.0001). The incidence of gangrenous cholecystitis was doubled in the COVID-19 group (40.7% compared with 22.3%). The mean wall thickness of the gallbladder was significantly higher in the COVID-19 group [6.32 (SD: 2.44) mm compared with 5.4 (SD: 3.45) mm; p < 0.0001]. Conclusions: The incidence of gangrenous cholecystitis is higher in COVID patients compared with non-COVID patients admitted to the emergency department with acute cholecystitis. Gangrenous cholecystitis in COVID patients is associated with high-grade Clavien-Dindo postoperative complications, longer hospital stay and higher mortality rate. The open cholecystectomy rate is higher in COVID compared with non -COVID patients. It is recommended to delay the surgical treatment in COVID patients, when it is possible, to decrease morbidity and mortality rates. COVID-19 infection and gangrenous cholecystistis are not absolute contraindications to perform laparoscopic cholecystectomy, in a case by case evaluation, in expert hands. Graphical
1

2 May 2018 in Anticancer Research
Verified
Journal Article
Open access
PDF file
Nikolaos MachairasNikolaos Machairas
Nikolaos Machairas
DPDimitrios Papakonstantinou
Dimitrios Papakonstantinou
PSParaskevas Stamopoulos
Paraskevas Stamopoulos
APAnastasia Prodromidou
Anastasia Prodromidou
ZGZoe Garoufalia
Zoe Garoufalia
GSGeorgios C. Sotiropoulos
Georgios C. Sotiropoulos
Background/Aim: Tumor recurrence complicates more than half of patients at 5 years after primary hepatocellular carcinoma (HCC) resection. Repeat open liver resection (ROLR) is the standard procedure for patients eligible for repeat resection, whereas laparoscopic repeat liver resection (RLLR) has been proposed as an alternative approach. The aim of this systematic review is to evaluate studies reporting on outcomes of RLLR for recurrent HCC (rHCC). Materials and Methods: A comprehensive search of the literature was undertaken. Results: A total of 11 studies, 6 non-comparative and 5 comparative (RLLR versus ROLR), which reported outcomes for 165 patients who underwent RLLR, were included in our review. RLLRs were associated with reduced blood loss, shorter hospital stay, lower conversion to ROLR and lower morbidity rates. Conclusion: Selected patients with rHCC who undergo RLLR, benefit in terms of short-term outcomes. Larger prospective trials will elucidate the impact of RLLR on long-term outcomes and establish treatment guidelines.