George Vretzakis

ORCID: 0000-0001-5682-2925
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About
Contact & Profiles
Research Areas
  • Hemodynamic Monitoring and Therapy
  • Cardiac, Anesthesia and Surgical Outcomes
  • Anesthesia and Pain Management
  • Anesthesia and Sedative Agents
  • Traumatic Brain Injury and Neurovascular Disturbances
  • Airway Management and Intubation Techniques
  • Cardiac and Coronary Surgery Techniques
  • Blood transfusion and management
  • Heart Rate Variability and Autonomic Control
  • Abdominal Surgery and Complications
  • Trauma, Hemostasis, Coagulopathy, Resuscitation
  • Optical Imaging and Spectroscopy Techniques
  • Cerebrovascular and Carotid Artery Diseases
  • Renal function and acid-base balance
  • Anesthesia and Neurotoxicity Research
  • Cardiovascular Syncope and Autonomic Disorders
  • Respiratory Support and Mechanisms
  • Pain Management and Opioid Use
  • Aortic aneurysm repair treatments
  • Hernia repair and management
  • Spine and Intervertebral Disc Pathology
  • Shoulder Injury and Treatment
  • Vascular Procedures and Complications
  • Neurosurgical Procedures and Complications
  • Nausea and vomiting management

University of Thessaly
2007-2018

University Hospital of Larissa
2008-2018

Aristotle University of Thessaloniki
2004-2017

G. Papanikolaou General Hospital
2014

University Hospital of Ioannina
2010-2014

University Hospital of Alexandroupolis
2003-2011

Democritus University of Thrace
2005-2011

European Society of Anaesthesiology
2005

San Diego Cardiac Center
2004

In-Q-Tel
2002-2004

Abstract Background Blood transfusions are common in cardiac surgery, but have been associated with increased morbidity and long-term mortality. Efforts to reduce blood product use during surgery include fluid restriction minimize hemodilution, protocols guide transfusion decisions. INVOS is a modality that monitors brain tissue oxygen saturation, could be useful guiding decisions transfuse. However, the role of (brain saturation) as part an algorithm direct has not evaluated. This study was...

10.1186/1749-8090-8-145 article EN cc-by Journal of Cardiothoracic Surgery 2013-06-07

Pruritus is the most common side effect of intrathecal morphine for postoperative pain relief. Activation central 5-hydroxytryptamine subtype 3 (5-HT3) receptors one its possible mechanisms. The role 5-HT3 antagonists in prevention pruritus has not been clearly established. In a prospective, randomized, double-blind, placebo-controlled study, we evaluated efficacy prophylactic administration ondansetron and dolasetron morphine-induced pruritus. patients were randomized into groups to receive...

10.1213/01.ane.0000181338.35454.6a article EN Anesthesia & Analgesia 2005-10-11

Aspiration of subglottic secretions is a widely used intervention for prevention ventilator-associated pneumonia. However, using the Hi-Lo Evac endotracheal tube (Hi-Lo Evac; Mallinckrodt; Athlone, Ireland) (Evac ETT), dysfunction suction lumen and subsequent failure to aspirate are common. Our objective in this study was determine causes experienced with ETT.We studied 40 adult patients intubated ETT. In all cases which observed, port examined visually flexible bronchoscope.Dysfunction...

10.1213/01.ane.0000278155.19911.67 article EN Anesthesia & Analgesia 2007-10-01

Abstract Background Cardiac surgery is a major consumer of blood products, and hemodilution increases transfusion requirements during cardiac under CPB. As intraoperative parenteral fluids contribute to hemodilution, we evaluated the hypothesis that fluid restriction reduces packed red-cell (PRC) use, especially in transfusion-prone adults undergoing elective surgery. Methods 192 patients were randomly assigned restrictive (group A, 100 pts), or liberal B, 92 pts) intravenous administration....

10.1186/1749-8090-5-7 article EN cc-by Journal of Cardiothoracic Surgery 2010-02-24

Introduction . The prognostic value of age, physical status, and duration surgery on perioperative course has been extensively studied. However, the impact deep hypnotic time (time when Bispectral Index values are less than 40) not well evaluated. Methods We designed an observational study to clarify relative influence (DHT) outcome. Eligible participants were mentally stable patients over 18 years old scheduled for elective major abdominal surgery. In total, 248 enrolled. Data analyzed...

10.1155/2015/829151 article EN cc-by Anesthesiology Research and Practice 2015-01-01

Interscalene brachial plexus block (ISB) may be followed by cardiovascular instability. Until date, there is no clear picture available about the underlying mechanisms of ISB. In this study, we aimed to determine changes in heart rate variability (HRV) parameters after ISB and differences between right- left-sided ISBs.We prospectively studied 24 patients operated for shoulder surgery sitting position divided them into two respective groups: R (right-sided = 14 pts) L (left-sided 10 pts)....

10.4097/kjae.2013.64.5.432 article EN cc-by-nc Korean journal of anesthesiology 2013-01-01

Introduction. Pain after cardiac surgery affects long-term patient wellness. This study investigated the effect of preoperative pregabalin on acute and chronic pain elective with median sternotomy. Methods. Prospective double blind study. 93 patients were randomly assigned into three groups: Group 1 received placebo, 2 oral 75 mg, 3 150 mg. Data collected 8 hours, 24 months postoperatively. Results. Patients receiving required fewer morphine boluses (10 in controls versus 6 4 2, <mml:math...

10.1155/2017/2753962 article EN cc-by Anesthesiology Research and Practice 2017-01-01

Epithelial-myoepithelial tumors of the lung are rare neoplasms whose biological behavior and clinical course still remain to be defined. carcinoma (EMCa) is a low-grade malignant tumour. According literature, most commonly occurs in salivary glands, particularly parotic gland, but it can also occur unusual locations such as breast, lachrymal nose, paranasal sinus, lung, bronchus and, our case, trachea. There no many documented case reports primary myoepithelial We report 34-year-old man...

10.3978/j.issn.2072-1439.2013.11.17 article EN PubMed 2014-03-01

Existing data suggest that obesity correlates with airway hyper-reactivity. However, the incidence of bronchospasm during bariatric surgery in obese patients has not been well studied.This was a prospective observational study comparing 50 versus non undergoing elective laparoscopic over 2 year period. Bronchospasm detected clinically by auscultation and confirmed measuring peak pressure mechanical ventilation. Blood gases were measured at predetermined time intervals intraoperatively....

10.1186/s40064-016-2054-3 article EN SpringerPlus 2016-04-12

There is evidence from previous studies that deeper anaesthetic levels reduce postoperative pain along with analgesic requirements. The aim of this study was to confirm observation during major urological procedures under sevoflurane anaesthesia.Seventy ASA I or II patients undergoing radical prostatectomy nephrectomy were randomly allocated into two groups: the L-BIS group BIS (bispectral index scale) values kept within a range 20-30 and H-BIS 50-60. Sevoflurane main agent used, inhalation...

10.1097/eja.0b013e328337cbf4 article EN European Journal of Anaesthesiology 2010-08-03
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