Physiological Science Services

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Presentation transcript:

Physiological Science Services Dr. Sampath Gunawardena Department of Physiology Faculty of Medicine University of Ruhuna

Physiological Science Services Lung function tests (Spirometry) Nerve conduction studies (Electroneurogram/electromyogram) Electroencephalogram (EEG) Electrocardiogram (ECG) Hearing tests (Audiometry) Visual field testing (Perimetry) Serum osmolality /urine osomolality Oesophageal pH /oesophageal manometry

Examinations and procedures Lung function tests (spirometry ) To diagnose obstructive airways disease or restrictive lung diseases Patient is allowed to rest before the test Proper instructions/demonstration of the procedure before doing the test Same procedure repeated three times and best readings are taken

Spirometer

Safety Issues Spreading infections – e.g. TB Always use a new mouth-piece Use a disposable turbine or wash the reusable turbine after use Patient’s fitness

Calibration Best if the flow rate is calibrated Usually volume calibration is done Some newer machines say not compulsory to calibrate 3 L Calibration Syringe

Issuing of the Report

Issuing of the Report contd… It is important to note whether the patient properly followed the instructions when doing the test (Encourage and cheer-up the patient) Make a note on the report regarding this Poor attempt may look like restrictive lung disease! Always give a feedback to the patient regarding his or her test result

Quality control and Quality Assurance Quality control – to make sure the machine is able to measure the required parameters correctly (Calibration) Quality Assurance – covers wider area –to make sure that in each of the patient when the testing is done whether all the efforts are taken to obtain a correct reading (including quality control) – Effort, repeatability, elimination of technical or patient errors etc

Issues with other tests

ECG Leads should be placed at the proper place Good contact with the skin – Using ECG paste, cleaning the suction cups Look at the calibration signal (1mv = 10mm) Proper grounding Cables and connections should be maintained

Perimetry Calibration – Intensity of the light should be tested for correct lumens. If required bulb has to be replaced Accurate instructions – Not to move the eye – examiner can check it. To press the button as soon as a light is seen Patient may feel sleepy in the dark environment and not respond

Audiometry Calibration – for pure tone correct frequency/decibel sound Proper instructions Examiner should master the technique

Serum / Urine osmolality Calibration of the equipment (different osmlarities – 100, 300, 500, 850, 2000 mosm/kg) – Zero calibration with distilled water Storing the sample properly – do not allow to evaporate- Readings may be erroneously high

Take home message Calibration and maintenance of equipment is important as with any other instrument A good interaction between patient and investigator is vital in obtaining correct results The End