Ioannis K Vakalopoulos

Prof. Ioannis K Vakalopoulos

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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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1 October 2015 in Hormones
Verified
Journal Article
Closed access
IVIoannis K Vakalopoulos
Ioannis K Vakalopoulos
PDPetros Dimou
Petros Dimou
IAIoannis Anagnostou
Ioannis Anagnostou
TZTheodosia Zeginiadou
Theodosia Zeginiadou
While cancer, and especially testicular cancer and Hodgkin's disease, affects male fertility in many ways, the current increase of survival of male cancer patients of reproductive age or earlier has emerged as a new challenge to their subsequent ability to father children. Cancer treatments, including surgery, radiotherapy and chemotherapy, can have a transitory as well as a permanent detrimental impact on male fertility. Gonadotoxic effects and the length of time for sperm recovery after radiotherapy depends not only on initial semen quality, but also on gonadal dosage and the delivery method after chemotherapy, on the type of regimens and dosages and on the spermatogenesis phase that each drug impacts. Combination treatment with radiotherapy and chemotherapy will induce more gonadotoxicity than either modality alone. Although efforts to prevent gonadal toxicity in cancer treatment are routinely applied, sperm cryopreservation remains the gold standard to maintain male fertility after cancer survival. Fertility preservation for prepubertal boys presents the greatest problem due to the absence of mature sperm in their gonads. In this area, research efforts are concentrated on cryopreservation of immature gametes and, in particular, techniques for their maturation and proliferation after thawing.

1 November 2013 in The Journal of Sexual Medicine
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Journal Article
Closed access
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IVIoannis K Vakalopoulos
Ioannis K Vakalopoulos
SKSpyridon Kampantais
Spyridon Kampantais
SIStavros Ioannidis
Stavros Ioannidis
LLLeonidas Laskaridis
Leonidas Laskaridis
PDPanagiotis Dimopoulos
Panagiotis Dimopoulos
VKVasileios Katsikas
Vasileios Katsikas

11 April 2012 in Advances in Urology
Verified
Journal Article
Open access
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IVIoannis K Vakalopoulos
Ioannis K Vakalopoulos
SKSpyridon Kampantais
Spyridon Kampantais
LLLeonidas Laskaridis
Leonidas Laskaridis
VCVasileios Chachopoulos
Vasileios Chachopoulos
MKMichail Koptsis
Michail Koptsis
CTChrysovalantis Toutziaris
Chrysovalantis Toutziaris
Severe persistent stress incontinence following radical prostatectomy for prostate cancer treatment, although not very common, remains the most annoying complication affecting patient’s quality of life, despite good surgical oncological results. When severe incontinence persists after the first postoperative year and conservative treatment has been failed, surgical treatment has to be considered. In these cases it is generally accepted that artificial urinary sphincter is the gold standard treatment. AUS 800 by American Medical Systems has been successfully used for more than 35 years. Recently three more sphincter devices, the Flow-Secure, the Periurethral Constrictor, and the ZSI 375, have been developed and presented in the market. A novel type of artificial urinary sphincter, the Tape Mechanical Occlusive Device, has been inserted in live canines as well as in human cadavers. These new sphincter devices are discussed in this paper focusing on safety and clinical results.

3 May 2023 in Asian Journal of Urology
Verified
Journal Article
Open access
AAAnastasios Anastasiadis
Anastasios Anastasiadis
AKAntonios Koudonas
Antonios Koudonas
GLGeorgios Langas
Georgios Langas
STStavros Tsiakaras
Stavros Tsiakaras
DMDimitrios Memmos
Dimitrios Memmos
Jean de la RosetteJean de la Rosette
Jean de la Rosette
To provide a comprehensive review on the existing research and evidence regarding artificial intelligence (AI) applications in the assessment and management of urinary stone disease. A comprehensive literature review was performed using PubMed, Scopus, and Google Scholar databases to identify publications about innovative concepts or supporting applications of AI in the improvement of every medical procedure relating to stone disease. The terms ‘‘endourology’’, ‘‘artificial intelligence’’, ‘‘machine learning’’, and ‘‘urolithiasis'’ were used for searching eligible reports, while review articles, articles referring to automated procedures without AI application, and editorial comments were excluded from the final set of publications. The search was conducted from January 2000 to September 2023 and included manuscripts in the English language. A total of 69 studies were identified. The main subjects were related to the detection of urinary stones, the prediction of the outcome of conservative or operative management, the optimization of operative procedures, and the elucidation of the relation of urinary stone chemistry with various factors. AI represents a useful tool that provides urologists with numerous amenities, which explains the fact that it has gained ground in the pursuit of stone disease management perfection. The effectiveness of diagnosis and therapy can be increased by using it as an alternative or adjunct to the already existing data. However, little is known concerning the potential of this vast field. Electronic patient records, containing big data, offer AI the opportunity to develop and analyze more precise and efficient diagnostic and treatment algorithms. Nevertheless, the existing applications are not generalizable in real-life practice, and high-quality studies are needed to establish the integration of AI in the management of urinary stone disease.

1 June 2009 in Journal of Endourology
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Journal Article
Closed access
IVIoannis K Vakalopoulos
Ioannis K Vakalopoulos
To determine statistically significant parameters that influence shockwave lithotripsy (SWL) outcome and to develop a mathematical equation to predict the possibility of a successful outcome. Radiopaque ureteral and renal stones (1997) underwent SWL in a single center using the Siemens Lithostar Plus lithotripter. Investigated variables were stone size and location; presence of multiple stones; patient sex, age, body mass index (BMI), and ureteropelvic junction (UPJ) diameter; and Double-J catheter presence. The investigation included intravenous urography or ultrasonography and plain radiography of the kidneys, ureters, and bladder (KUB). Ten percent of the patients also underwent unenhanced CT to determine stone volume and density. Patients were evaluated 3 months postoperatively by plain radiography of the KUB. Student t test, chi-square test, and multiple logistic regression analysis were used to determine statistically significant variables and to create predictive mathematical equations. Kidney, ureter, total stone-free rate, and re-treatment rate were 71%, 80.9%, 74.9% and 18%, respectively. Complications included two perirenal hematomas, one significant cardiac arrhythmia, and 3.7% stein-strasse. Statistically significant variables were patient age, sex, BMI, stone size, volume, density, multiple lithiasis, and UPJ diameter. By using statistical analysis, coefficients were calculated for each significant variable. The mathematical model calculating the probability (P) of success with a mean predictive value of about 80% is: P = 1/1 + e(-z) where e is the base of the natural logarithm and z = ct + the total of products of each coefficient multiplied by each variable value. Using the described method, similar predictive equations can be created for different lithotripters and used by computer software to aid both patient counseling and doctor decision and ensure an optimal combination of maximum efficacy and safety and minimum cost.

20 February 2011 in International Urology and Nephrology
Verified
Journal Article
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IVIoannis K Vakalopoulos
Ioannis K Vakalopoulos
GDGeorgios Dimitriadis
Georgios Dimitriadis
AAAnastasios Anastasiadis
Anastasios Anastasiadis
GGGeorgios Gkotsos
Georgios Gkotsos
DRDemetrios Radopoulos
Demetrios Radopoulos