Nikica Lesjak dr. med.

Child Surgery

Available for all questions in the field of pediatric surgery, pediatric urology and questions related to sports injuries

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Specialist in pediatric surgery with permanent employment at the Zagreb Children's Clinic, the popular Klaićeva. I started my education at the General Gymnasium in Čakovec, after that I finished the Faculty of Medicine of the University of Zagreb within the deadline, where I graduated in July 2009. I did my internship at the County Hospital in Čakovec, and after passing the professional exam at the Ministry of Health of the Republic of Croatia, I was employed as an Emergency Medical Service employee working in the field and in the emergency medicine clinic for 18 months. After that, I started secondary training at the department of abdominal surgery at the County Hospital in Čakovec and finally got a specialization in pediatric surgery at the Zagreb Clinic for Children's Diseases.

In the period of 7 years of work at Klaićeva, I gained a lot of experience working in emergency and general pediatric surgery clinics. My area of special interest is pediatric urology, and for this purpose I attended additional specialist education at one of the strongest pediatric urology centers at SickKids Hospital in Toronto, Canada under the mentorship of Professor Marty Koyl. I attended many other courses in endoscopic and laparoscopic surgery and pediatric urology in Croatia and abroad, and participated with numerous papers in many European and world congresses of pediatric surgery and urology.

Since September 2015, I have been the doctor of the Basketball Club Cibona, during the same period working with all age groups of KK Cibona, from seniors to younger cadets, I gained significant experience in the field of sports medicine and sports injuries.

WORK EXPERIENCE

14.9.2019 - specialist in pediatric surgery, Department of Urology, Clinic for Pediatric Surgery
12.3.2013. – 13.9.2018. – Clinic for Pediatric Surgery, Clinic for Pediatric Diseases Zagreb, specialist in pediatric surgery
1.9.2015. – Basketball club Cibona, club doctor
1.2.2017. – 30.6.2017. – Clinic for traumatology, KBC Sesre milosrdnice – general surgical branch of specialization, area of traumatology
2.2015. - 6.2016. - Dubrava Clinical Hospital - general surgical branch of specialization, area of abdominal, thoracic, vascular and plastic surgery
16.4.2012. – 20.12.2012. - Surgery Department of the Čakovec County Hospital, candidate for specialization in pediatric surgery
23.12.2010. – 15.04.2012. - Dom zdravlja Čakovec, doctor of medicine as part of the emergency medical assistance team
17.11.2009. – 16.11.2010. - Čakovec County Hospital, internship

COURSES

9-27.9.2019. Study stay, The Hospital for Sick Children, Toronto, Canada, work at the Department of Pediatric Urology under the mentorship of Professor Marin Koyl
14-17.3.2018. Videosurgery in pediatric urology training of advanced laparoscopic procedures, IRCAD, Strasbourg, France
19-23.2.2018. Utrecht Medical Center, The Netherlands, education in urodynamics, diagnosis and treatment of neurogenic bladder and urinary disorders under the mentorship of Professor Tom de Jong
21-22.4.2017. Elastic stable osteosynthesis of long bone fractures in children and adolescents, Cres; KBC Rijeka
5.2.2017. Spinal defects of neural tube development - prevention, diagnosis and treatment - Academy for Developmental Rehabilitation, Zagreb
26.-29.9.2016. Management strategies of pediatric neuropathic bladder; Children's Hospital Zagreb, Zagreb (Croatia)
27-28 May 2016. Update in Pediatric Colorectal and Reconstructive Surgery - Anorectal malformations, Hirschprung's disease and fecal incontinence; Children's Hospital Zagreb, Zagreb (Croatia)
20-22 April 2016. Basic laparoscopic surgery course - Aesculap Academy, Clinical Hospital Center Sestre milosrdnice, Zagreb
5.3.2016. Benign bone tumors in children, News and controversies in diagnosis and treatment; Clinic for Children's Diseases Zagreb
12.-13.2.2016. New suture materials, grafts and local flaps – Clinic for plastic, aesthetic and reconstructive surgery, Clinical Hospital Dubrava
4-5 November 2014. Additional training on the application of protection measures against ionizing radiation - Zagreb University of Health
11.4.2013. Endoscopic treatment of primary vesicoureteral reflux in children - Clinic for Children's Diseases Zagreb

PROFESSIONAL AND SCIENTIFIC PAPERS

Župančić B, Štampalija F, Lesjak N, Car A, Višnjić S, Župančić V; Dilemmas and difficulties in surgical approach to acute abdomen in children; Paediatr Croat.; 2013; 57 (suppl 1); 139-145
Župančić B, Lesjak N, Župančić V, Gliha A, Petračić I, Pašalić I, Bašković M; What else can we learn about acute scrotum?!; Paediatr Croat. 2015; 59 (Suppl 1): 119-127
Bašković M, Župančić B, Lesjak N, Vukasović I; Hypertrophic stenosis of the pylorus – a retrospective five-year analysis; Acta Med Croatica; 2016; 70:103-106
Bahtijarević Z, Štampalija F, Lesjak N, Sovic Lj, Petračić I, Bastić M, Pajić A, Župančić B; The importance of cooperation between pediatricians and pediatric surgeons in preserving a man's sexual health; Paediatr Croat. 2016;60 (Suppl 3):25-34
Višnjić S, Car A, Žganjer M, Čizmić A, Gliha A, Mesić M, Lesjak N and others; Guidelines for the establishment of intestinal continuity in the prevention and treatment of blind loop syndrome in children; Paediatria Croatica, Vol. 62 No. 1, 2018
Matić I, Čizmić A, Žganjer M, Petračić I, Lesjak N, Čizmić L and others; Hemorrhagic pseudocyst of the adrenal gland: case report and literature review; Paediatr Croat. 2018;62:135-9
Lesjak N, Petračić I, Birt A, Stipić D, Colić T, Bastić I, Štampalija F, Pajić A, Bahtijarević Z; Endoscopic treatment of primary vesicoureteral reflux at the Zagreb Children's Clinic; Paediatr Croat. 2019;63:75-81
Petračić I, Čerfalvi I, Višnjić S, Gliha A, Lesjak N; The influence of pyloric muscle thickness on changes in acid-base status in children with congenital hypertrophic stenosis of the pylorus; Paediatr Croat. 2019;63:82-6

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