The Measurements of End-tidal Carbondioxide Levels
Condition: Other Disorders of the Eye Following Cataract Surgery
MeSH terms: Cataract
Study type: Observational

Summary: 
      Purpose: The aim of this retrospective study is to investigate the end tidal carbon dioxide
      pressure (ETCO2) values in order to determine the carbon dioxide accumulation under drape and
      to investigate it's hemodynamic effects based on anesthetic and surgical records in eye
      surgeries under local anesthesia.

      Methods: The data were collected from anesthetic records of the patients who were followed
      with noninvasive capnograph (Capnostream 20 p, Oridion®, Israel) by the anesthesiology
      department in the operating room at Duzce University Faculty of Medicine Hospital during the
      period of January 2016 to December 2016.

      Collected data from the 42 patients' records were systolic, diastolic and mean arterial
      pressures, operation duration, total local anesthetic and, heart rate, ST segment analysis,
      ETCO2 pressure, pulse oximeter values.

      The time periods of collected datas were determined as: after the anesthesia and before drape
      closure (baseline level), at 10th, 15th, 20th, 45th of the surgery and 5 minutes after drape
      removal.
    

Detailed description: 
      After approval from the Duzce Faculty of Medicine Noninvasive Researches Ethics Committee
      (02.01.2017), the datas were collected patients anesthetic forms who were followed with
      capnograph (Capnostream 20 p, Oridion, Israel) by the anesthesiology department for eye
      surgery in the operating room at Duzce University Faculty of Medicine Hospital during the
      period of 01 January 2016 to 31 December 2016. It was observed that 42 patient records met
      the study criteria. Demographic and clinical datas were abstracted from anesthetic and
      clinical records.

      Age, weight, height of the patients, operation types, operation duration times, local
      anesthetic performing types, noninvasive systolic, diastolic and mean arterial pressures,
      cardiac rates, ST segment analysis (Datex Ohmeda monitor, GE Health Care, Finland) ( This
      monitor use for the routine monitorisation in the eye surgery operating room in our hospital)
      systolic, diastolic and mean arterial pressure measurements, end tidal carbon dioxide levels,
      pulse oximeter values were extracted from anesthetic forms retrospectively.

      Arrhythmia recordings were evaluated as (yes / no) over time periods. Surgical field was
      covered with reusable cotton fabric drape or dispossible surgical adhesive plastic drape
      (SteriDrape, 3M). We included the patients records who were covered with the same kind of
      drapes (SteriDrape, 3M). We excluded records with another type of drapes usage or without any
      data about drape type to provide the homogenisation and clearity of the results.

      Datas were collected from the anesthetic forms which time periods were determined as the
      baseline, before closing drape, at 10th, 15th, 20th, 45th minutes after covering and 5
      minutes after drape removal. Records with pulmonary disease, diabetes mellitus and sedative
      usage, alcohol usage were excluded from the study.

      The comparisons were made with patients basal status and time periods statistically.
    

Observational model: Case-Control
Time perspective: Retrospective
Sampling method: Non-Probability Sample
Study population: 
        the patients who were followed with capnograph (Capnostream 20 p, Oridion, Israel) by the
        anesthesiology departhment in the operating room at Duzce University Faculty of Medicine
        hospital during the period of January 2016 to December 2016 was collected.
      
Keywords: End-tidal carbondioxide; surgery drapes; carbondioxide accumulation; eye surgery