Skip to main content

DEFIBRILLATOR


DEFIBRILLATOR:

  •  Ventricular Fibrillation: Ventricular fibrillation is a serious cardiac emergency resulting from asynchronous contraction of the heart muscles.

  • This uncoordinated movement of the ventricle walls of the heart may result from coronary occlusion, from electric shock or from abnormalities of body.

  • Because of this irregular contraction of the heart muscles, the ventricles cannot pump the blood effectively. It results in Life threatening condition.
  • Cardiac Arrhythmia: Any disturbance in the heart’s normal rhythmic contraction is called an arrhythmia. Mainly two types:
              1.        Tachycardia:An increase in Heart rate above normal limit is called Tachycardia.
              2.        Bradycardia:A decrease in Heart rate below normal limit is called Bradycardia.
  •  Need/Principle of Defibrillator: Ventricular fibrillation and Cardiac arrhythmia can be    converted into a more efficient rhythm by applying a high energy shock to the heart. This sudden electric shock across the heart causes all muscles to contract simultaneously.
  • The instrument used to give the shock is called a Defibrillator.
      


  •   Types of Defibrillator:


1.      Manual External Defibrillator: Machine and electrodes are external to the patient. Electrodes are placed on the chest and electric shock is delivered to the patient.
2.      Manual Internal Defibrillator: Machine is external and electrodes are held directly on the heart while thoracic cavity opens and shock is delivered.
                         3.      Automatic External Defibrillator(AED):Machine and electrodes     are external to the patient and electrodes are attached to the patient. Shock is delivered to the patient automatically when abnormal condition arises.
4.      Implantable Defibrillator: Machine and electrodes are implanted inside the patient’s
body and automatically deliver the shock when abnormal condition arises.
 
Labels:

Comments

Post a Comment

Popular posts from this blog

MICROPROCESSOR BASED VENTILATOR

Microprocessor based Ventilator   Figure shows the block diagram of microprocessor controlled ventilator.(given below). It consists of two inter-connected systems: The Pneumatic flow system and an Electronic control system. The pneumatic flow system enables the flow of gas through the ventilator. Oxygen and medical grade air enter the ventilator at 3.5 bar (50 psi) pressure. These gasses enter the air/oxygen mixer where they combine and gasses then enter a large reservoir tank. An electronically controlled flow valve proportions the gas flow from the reservoir tank to the patient breathing circuit.   As the gasses leave the ventilator, they pass by an oxygen analyzer, a safety ambient air inlet valve and a back-up mechanical over pressure valve. The microprocessor controls each valve to deliver the desired inspiratory air and oxygen flows for mandatory and spontaneous ventilation. The electronic control system may use one or...
Post a Comment
Read more

WHAT IS NABULIZER

  Nebulizer:   Nebulizer is used when water or some type of medication suspended in the inspired air as an aerosol is to be given to the patient.   A nebulizer is a breathing machine used to treat respiratory illnesses, such as asthma. In this device, the water or medication is picked up by a high velocity jet of air/oxygen and is inhaled by the patient through nose or mouth. The nebulizer turns the air and oxygen into aerosol with medicine, and this is what patients will inhale to make them breathe easier, curing their asthma or respiratory problem.             Procedure/Operation: Open the nebulizer cup by turning the upper part counter-clockwise. Pour the quantity of drug as prescribed by the physician into the cup. Close the nebulizer by turning the upper part clockwise Connect the cup to the unit’s air outlet by means of the tube. Apply one of the required accessories: mo...
Post a Comment
Read more

Anasthesia machine and it's block diagram.

Anaesthesia Machine: An anaesthesia machine is a device which is used to deliver variable gas mixture of anaesthetic gas and air/oxygen gases to the patient’s respiratory system.   Need Of Anaesthesia Machine: Surgical Operations normally carried out under some form of Anaesthesia. The functions of anaesthesia are:         1)      It ensures that the patient does not feel pain and minimizes patient discomfort.         2)      It provides the surgeon with favourable conditions for the work. Examples: Diethyl ether, Chloroform, Halothane, cyclopropane and Nitrous oxide. ·        Anaesthesia Machine block diagram:     Anaesthesia machine is consists of two subsystems : (i)         Gas supply system: Gases are provided to the anaesthesia machine...
Post a Comment
Read more