medical training - monitoring - for internal use only
TRANSCRIPT
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Medical Training- Monitoring -
For internal use only
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Objective of Presentation
• This presentation on Monitoring gives the reader an overview of current systems which can be used to monitor mechanical ventilation. It covers medical fundamentals and recognition of life-threatening situations.
• The reader will also become acquainted with the different priorities of alarms on MEDUMAT Transport.
© WEINMANN GERÄTE FÜR MEDIZIN GMBH+CO.KG, Medical Training - Monitoring, June 2008
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Contents
• Ventilation Monitoring• Pressure/Volume Curve• Capnometry /Capnography• MEDUMAT Transport Alarms
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Ventilation MonitoringEvery use of mechanical ventilation has to be monitored continuously as a check of its effectiveness and success. In addition to oxygen saturation -- the ‘sign of success’ – other measures are required for the assessment and management of the ventilation process. The following parameters can be used in an evaluation:
–Clinic–Capnometry–Expiration volumetry–Ventilation pressures–(Blood Gas Analysis)
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Important Parameters For Assessing the Quality of Ventilation
• Measurements:– Tidal volume– Respiratory Minute Volume– Respiratory rate– Maximum pressure– PEEP level
– etCO2
• Curves– Flow curve– Pressure curve– Capnography
© WEINMANN GERÄTE FÜR MEDIZIN GMBH+CO.KG, Medical Training - Monitoring, June 2008
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Pressure Curve• Composition of Pressure/Time Diagram
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Flow Curve• Composition Flow/Time Diagram
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Capnometry /Capnography
• Non-invasive continuous monitoring of CO2 portion of exhaled air
– Check position of tube
– Check ventilation
– Check circulatory function
• Sensitive monitoring process• Two different reporting means
– capnometry (numeric value)
– capnography (curve)
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Structure of CO2 Curve in Capnogram
I. Inspiration
II. CO2 of upper airways (dead space)
III. CO2 of lower airways (alveoli)
IV. Start of next inspiration
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Functional Principle of etCO2 Measurement
• Infrared spectroscopy with wave length of 426 nm • Absorption of light proportional to number of available
CO2 gas molecules
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Interpretation of CO2 Curves• Exponential decrease in PCO2
– Cardiac arrest– Pulmonary embolism– Sudden decrease in blood pressure
• Constant low etCO2– Absolute hyperventilation – Low body temperature– Centralization of shock
• Constant high etCO2– Hypoventilation
• Sudden decrease in etCO2– Accidental extubation– Faulty esophageal intubation– Disconnection
• Slant in etCO2 plateau– Bronchospasms (e.g., asthma)
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Influences on etCO2 Level
In patients depending on:
– Circulatory function and CO2 transport to lungs
– Metabolism at cellular level
– Ventilation for respiratory elimination of CO2
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Normal Capnometry /Capnography
– etCO2 in patient with normoventilation
• 4-5 Vol% = 30-35 mm Hg– Conversion:
• 1 Vol% = 7 mmHg• 1 mmHg = 0.15 Vol%
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Alarms
• Distinction between physiological and system alarms in MEDUMAT Transport
• Graduated in three (3) alarm escalation levels• Requires individual adjustment for each patient
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Alarm – High Priority
• Tidal volume high/low• Respiratory Minute Volume high/low• Apnea• Leak on patient side of device• Expiratory CO2 high/low• Inspiratory CO2 high• Airway pressure high/low• Oxygen supply low
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Alarms – Medium Priority
• Respiratory rate high• Oxygen concentration high
• CO2 Occlusion
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Alarm – Low Priority
• CO2 module defective
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Summary
• Every ventilation of a patient requires that thorough checks be made of the ventilation settings by measuring physiological parameters.
• Knowing the etCO2 numerical values and curves gives the user a greater degree of safety and certainty during ventilation of emergency patients.
• Device-specific alarms in three different priority levels indicate problems or danger.