NIKOLAOS PAPADIMITRIOU

NIKOLAOS PAPADIMITRIOU

orcid

Research Focus & Metrics

Academic Career Length

28Years (1999-Present)

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

Representative Publications

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1 May 2006 in The Journal of Laryngology & Otology
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Journal Article
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JXJ Xenellis
J Xenellis
IKI Karapatsas
I Karapatsas
NPNIKOLAOS PAPADIMITRIOU
NIKOLAOS PAPADIMITRIOU
TNT Nikolopoulos
T Nikolopoulos
PMP Maragoudakis
P Maragoudakis
EFE Ferekidis
E Ferekidis
Objectives: Sudden sensorineural hearing loss (SSHL) remains a challenge for the clinician. In the majority of cases, no definite cause can be found and the prognosis is variable.Methods: The present study assessed 114 patients suffering from idiopathic SSHL, with regard to the prognostic value of demographic, epidemiologic, neurotologic and audiometric factors. In addition, the relationship between the identification of wave V in auditory brainstem responses and the final hearing outcome was investigated. All patients received 75 mg/day intravenous prednisolone, divided into three daily doses, for 10 days, with gradual tapering of the dose over the next 10 days.Results: The results (after one year follow up) revealed the following factors to be related to a better hearing outcome: younger age; male sex; less time elapsed between the onset of hearing loss and the beginning of treatment; and an upward-sloping or cupeloid audiogram contour. The detection of wave V early in recovery and within the first month of medical treatment might also constitute a significant favourable factor in respect to hearing recovery.Conclusions: The present study revealed that there are certain factors that affect prognosis in idiopathic SSHL. This is very important in counselling patients and may affect current clinical practice.

10 August 2023 in Cancer Research Communications
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Myrto MoutafiMyrto Moutafi
Myrto Moutafi
GKGeorgia-Angeliki Koliou
Georgia-Angeliki Koliou
GPGeorge Papaxoinis
George Papaxoinis
PEPanagiota Economopoulou
Panagiota Economopoulou
IKIoannis Kotsantis
Ioannis Kotsantis
APAmanda Psyrri
Amanda Psyrri
Purpose: We conducted a phase II randomized noncomparative window of opportunity (WOO) trial to evaluate the inhibition of cellular proliferation and the modulation of immune microenvironment after treatment with olaparib alone or in combination with cisplatin or durvalumab in patients with operable head and neck squamous cell carcinoma (HNSCC).Experimental Design: Forty-one patients with HNSCC were randomized to cisplatin plus olaparib (arm A), olaparib alone (arm B), no treatment (arm C) or durvalumab plus olaparib (arm D). The primary endpoint was to evaluate the percentage of patients in each arm that achieved a reduction of at least 25% in Ki67. Secondary endpoints included objective response rate (ORR), safety, and pathologic complete response (pCR) rate. Paired baseline and resection tumor biopsies and blood samples were evaluated for prespecified biomarkers.Results: A decrease in Ki67 of at least 25% was observed in 44.8% of treated patients, as measured by quantitative immunofluorescence. The ORR among treated patients was 12.1%. pCR was observed in 2 patients. Two serious adverse events occurred in 2 patients.Programmed death ligand 1 (PD-L1) levels [combined positive score (CPS)] were significantly higher after treatment in arms A and D. Expression of CD163 and colony-stimulating factor 1 receptor (CSF1R) genes, markers of M2 macrophages, increased significantly posttreatment whereas the expression of CD80, a marker of M1 macrophages, decreased.Conclusion: Preoperative olaparib with cisplatin or alone or with durvalumab was safe in the preoperative setting and led to decrease in Ki67 of at least 25% in 44.8% of treated patients. Olaparib-based treatment modulates the tumor microenvironment leading to upregulation of PD-L1 and induction of protumor features of macrophages.Significance: HNSCC is characterized by defective DNA repair pathways and immunosuppressive tumor microenvironment. PARP inhibitors, which promote DNA damage and “reset” the inflammatory tumor microenvironment, can establish an effective antitumor response. This phase II WOO trial in HNSCC demonstrated the immunomodulatory effects of PARP inhibitor–induced DNA damage. In this chemo-naïve population, PARP inhibitor–based treatment, reduced tumor cell proliferation and modulated tumor microenvironment. After olaparib upregulation of PD-L1 and macrophages, suggests that combinatorial treatment might be beneficial.Synopsis: Our WOO study demonstrates that preoperative olaparib results in a reduction in Ki67, upregulation of PD-L1 CPS, and induction of protumor features of macrophages in HNSCC.

1 October 1999 in Obesity Surgery
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Journal Article
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APAlexandros S. Papakonstantinou
Alexandros S. Papakonstantinou
CSCharalabos Stratopoulos
Charalabos Stratopoulos
ITIoannis Terzis
Ioannis Terzis
NPNIKOLAOS PAPADIMITRIOU
NIKOLAOS PAPADIMITRIOU
CSCharis Spiliadi
Charis Spiliadi
EHEvangelos Hadjiyannakis
Evangelos Hadjiyannakis

1 January 2022 in Acta Otorrinolaringológica Española
Verified
Journal Article
Closed access
MSMarilia Sapountzi
Marilia Sapountzi
GSGiorgos Sideris
Giorgos Sideris
EBEleni Boumpa
Eleni Boumpa
NPNIKOLAOS PAPADIMITRIOU
NIKOLAOS PAPADIMITRIOU
TNThomas Nikolopoulos
Thomas Nikolopoulos
ADAlexander Delides
Alexander Delides

28 November 2021 in Annals of Otology, Rhinology & Laryngology
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Journal Article
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GSGiorgos Sideris
Giorgos Sideris
NPNIKOLAOS PAPADIMITRIOU
NIKOLAOS PAPADIMITRIOU
GKGeorgios F. Korres
Georgios F. Korres
AKAnastasios Karaganis
Anastasios Karaganis
PMPavlos Maragkoudakis
Pavlos Maragkoudakis
ADAlexander Delides
Alexander Delides
To evaluate clinical and microbiological findings that are correlated with abscess formation in adult acute epiglottitis (AE). We reviewed 140 cases of adult AE. Demographic, clinical, imaging, and microbiological findings are analyzed for all patients with AE in comparison to those with epiglottic abscess (EA). A total of 113 patients presented with AE and 27 presented or progressed to EA (19.3%). Age, sex, seasonality, smoking, body mass index (BMI), and comorbidities were statistically insignificant between the 2 groups. Muffled voice (P < .013), respiratory distress (P < .001), and pre-existence of epiglottic cyst (P < .001) are symptoms and signs connected with abscess formation. A total of 120 patients were treated conservatively. Surgical treatment was performed on 20 patients with EA. About 72 out of 80 cultures revealed monomicrobial infection. Mixed flora was isolated in 8 patients with EA. Streptococcus was isolated in 51 out of 80 positive cultures (64%). Haemophilus Influenza (Hib) was not isolated in any sample. EA and mixed flora relates to a higher rate of airway intervention (P < .001). A high level of suspicion for abscess formation is required if clinical examination reveals dyspnea, muffled voice, or an epiglottic cyst in adult with AE. The existence of EA doubles the duration of hospitalization. EA is typically found on the lingual surface of the epiglottis. Supraglottic or deep neck space expansion should be treated surgically. EA is associated with a mixed flora and a higher rate of airway obstruction. Streptococcus is discovered to be the most common pathogen.

20 April 2025 in Journal of Audiology and Otology
Verified
Journal Article
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ILIlias Anastasios Lazarou
Ilias Anastasios Lazarou
GSGiorgos Sideris
Giorgos Sideris
NPNIKOLAOS PAPADIMITRIOU
NIKOLAOS PAPADIMITRIOU
ADAlexander Delides
Alexander Delides
George S. KorresGeorge S. Korres
George S. Korres
Third window syndrome (TWS) is an inner ear condition caused by an additional compliant point in the otic capsule that disrupts auditory and vestibular functions. Superior semicircular canal dehiscence is the most common cause, presenting with hearing loss, vertigo, and autophony, significantly impairing quality of life. This study evaluated the pathophysiology, diagnostics, treatments, and recent advancements in TWS while identifying research gaps. Using the Preferred Reporting Items for Systematic Reviews and Meta-Analyses guidelines, 70 studies from Embase, MEDLINE, Cochrane, and UpToDate databases were analyzed. TWS affects inner ear mechanics, enhancing bone conduction and reducing air conduction. Diagnosis involves clinical evaluations, high-resolution imaging, and functional tests such as vestibular evoked myogenic potentials, which are known for their high sensitivity and specificity. Management strategies range from vestibular rehabilitation and pharmacotherapy to surgical interventions, including transmastoid and middle cranial fossa approaches, which achieve over 75% success. Emerging minimally invasive techniques, such as underwater endoscopic ear surgery and round window reinforcement, show promise but carry risks like cerebrospinal fluid leakage and inconsistent symptom relief. Advancements in TWS management have improved outcomes, yet gaps remain, particularly in terms of false-positive imaging and long-term efficacy. Future studies should prioritize predictive models and minimally invasive techniques. A multidisciplinary approach is essential to improve patient care.