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Defibrillator.pptx biomedical instrument
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- 2. DEFIBRILLATOR A defibrillator isa device that gives a high energy electric shock to the heart of someone who is in cardiac arrest.This high energy shock is called defibrillation, and it’s an essential part in trying to save the life of someone who’s in cardiac arrest.A defibrillator may also be called a defib, an AED (Automated External Defibrillator) or a PAD (Public Access Defibrillator).
- 3. Defibrillation can helpwith: Ventricular tachycardia (very fast heartbeat) without a pulse. • Ventricular fibrillation (quivering of the heart muscle) which is most often the cause of sudden cardiac arrest.
- 4. A defibrillator shouldbe used when a person is in cardiac arrest. CPR should be done until you can get a defibrillator.. If you see someone having a cardiac arrest, call 999, start CPR and get someone to find a defibrillator.The emergency operator can advise you if you can’t find one. Once you get the defibrillator, turn it on and continue CPR until the device tells you to stop.
- 5. HISTORY OF DEFIBRILLATION •First demonstrated dog in 1899 by Jean louis Prevost and Frederic Batelli two Italian physiologist. • The first use on a human was in 1947 Claude Beck, professor of surgery at case west reserve universversity. • Transthoracic defibrillation was first use in human using alternating current AC.
- 6. TYPES OF DEFIBRILLATORS •Automated external defibrillators (AEDs) are found in many public spaces.They can save the lives of people who are in cardiac arrest.The unit tells the operator what to do. Even untrained people can use an AED in an emergency. Healthcare providers sometimes recommend keeping an AED at home if someone has a high risk for cardiac arrest.
- 7. • Implanted cardioverter defibrillators(ICDs) are small devices surgically placed in the chest. They are preprogramed to automatically detect cardiac arrest or a life-threatening arrhythmia.They then send a high-energy electric charge to stop the arrhythmia or restart the heart after cardiac arrest. Some ICDs also act as pacemakers by giving low- energy electrical pulses to help the heart beat at a normal rhythm. Others can send pulses of electricity to sync the rhythm of the heart’s lower chambers
- 8. • Wearable cardioverter defibrillators(WCDs) are vests with a rechargeable battery. Similar to the ICD, they automatically detect a life threatening rhythm and send an electrical charge to restore a normal rhythm.WCDs are usually for short-term use. It takes time and effort to get used to living with a defibrillator. Learn about common complications and how to minimize disruption to daily activities in the living with a defibrillator section.
- 9. HOW TO USEA DEFIBRILLATOR
- 10. HOW TO USEA DEFIBRILLATOR To use a defibrillator, follow these simple steps: Step 1:Turn the defibrillator on by pressing the green button and follow its instructions. Step 2: Peel off the sticky pads and attach them to the patient’s skin, one on each side of the chest, as shown in the picture on the defibrillator. Step 3: Once the pads have been attached, stop CPR and don’t touch the patient.The defibrillator will then check the patient’s heart rhythm.
- 11. Step 4: Thedefibrillator will decide whether a shock is needed and if so, it will tell you to press the shock button.An automatic defibrillator will shock the patient without prompt. Don’t touch the patient while they are being shocked. Step 5: The defibrillator will tell you when the shock has been delivered and whether you need to continue CPR. Step 6: Continue with chest compressions until the patient shows signs of life or the defibrillator tells you to stop so it can analyse the heartbeat again.
- 12. PRINCIPLE OF DEFIBRILLATION •Energy storage ohmic resistance capacitor is charged at relatively slow rate from Ac line. • Energy stored in capacitor Is then delivered at a relatively rapid rate to chest of the patient. • Simple arrangement involves the discharge of capacitor energy through the patient‘s own resistance. • The discharge resistance which the patient represents as purely ohmic resistance of 50 to100ohm. • This particular waveform is called ‘lown’ waveform. • The pulse width of this waveform is generally 10ms.
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- 15. AC DEFIBRILLATION • Applyinga brief(0.25 to 1sec)burst of 60HZ ac at an intensity of around 6A. • This application of an electric shock to resynchronize the heart sometimes called counter shock. • If the patient does not respond ,the burst is repeated Until defibrillation occur.This method is known as AC defibrillation.
- 16. DC DEFIBRILLATION • Acapacitor is charged to a high dcVoltage and then rapidly discharged, this method is called DC defibrillation. • The amount of energy discharge by capacitor may range between 2 to 400joules with peak value of curren20A. • A corrective shock of 750-800 volt is applied within a tenth of second.
- 17. PRECAUTIONS • The paddlesused used in the procedure Should not be placed : 1. On a women’s breast 2. Over an internal pacemaker patient. • Before the paddles is used, gel must be applied to the patient skin.
- 18. RISKS OF DEFIBRILLATION •Skin burn from the defibrillation paddles are the most common complication of defibrillation. • Other risk include injury to the heart muscle, abnormal heart rhythm and blood clots.
- 19. TROUBLE SHOOTINGS • Attachthe external and internal if the monitor reads,“No paddles”. • Check to ensure that the lead are securely attached if the monitor reads, ”No leads”. • Connect the unit of AC power if the message reads “low battery”. • Verify that the energy select Control setting are correct if the defibrillator does not charged.
- 20. Thank you Submitted by-khushi Rana (BBA(HA)2nd year) Submitted to- Anita Madam