Ventilators: Indications,Methods


Meaning: Mechanical ventilator is a device that inflates the lungs by positive pressure which is able to  carryout alveolar ventilation and maintain lung mechanics.
1) Mechanical failure of ventilation.
a) Neuromuscular disease
b) CNS depression (drug intoxication,respiratory depressants and cardiac arrest )
c) Inefficiency in thoracic cage for generating pressure gradients necessary for ventilation( chest injury, thoracic malformation)
d) When ventilatory support is needed post operatively
2) Disorders of pulmonary gas exchange.
a) Acute respiratory failure
b) Chronic respiratory failure
c) Left sided heart failure
d) Pulmonary disease resulting in diffusion abnormality.
e) Pulmonary disease resulting V/Q (Ventilation/perfusion ratio) mismatch.
f) acute lung injury
Methods of ventilation
1.Non invasive ventilation
  • Non invasive Negative pressure ventilation
  • Non invasive Positive pressure ventilation
2.Invasive methods of ventilation (positive pressure ventilation)
  • Volume targeted (volume cycled) ventilation
  • Pressure targeted (pressure cycled) ventilation
  • Time cycled ventilation
Non invasive ventilation
No artificial airway is necessary, patient must be able to control and protect own airway.
Indicated for patient' s with respiratory neuromuscular problems, or as adjunct to weaning from positive pressure ventilators.
Non invasive negative pressure ventilation
  • Patients with central sleep apnea or neuromuscular problems who require ventilator support during sleep.
  • Device typically encloses the thorax of the patient and allow the head and airway access to the ambient atmosphere.
  • Applies negative pressure around the chest wall → Increased intra-thorasic pressure changes prompt inspiration to occur
  • Example: iron lung tank ventilators
Non invasive positive pressure ventilation (NPPV)
  • Is a therapy to manage chronic respiratory failure or acute respiratory insufficiency which is expected to resolve quickly.
  • Breaths are delivered through tight-fit face masks.
  • NPPV provides low levels of continuous positive airway pressure (CPAP) to facilitate gas exchange.
  • Some devices apply positive pressure during both inspiration and expiration and are referred as bilevel positive airway pressure (BiPAP) device.

Invasive methods of ventilation
  • Requires a stable artificial airway.
  • Most common method of ventilating patient in acute care setting.
  • This method uses positive pressure to force air into the lungs via artificial airway.

Volume targeted ventilation
  • A specific volume for delivery of inspiration is set.
  • The ventilator is set to allow airflow into the lungs until a preset volume has been reached.
  • Terminates the inspiratory phase when preset volume of gas is delivered.

Pressure targeted ventilation
  • A specific positive inspiratory pressure (PIP) is set for delivery of inspiration.
  • The ventilator is set to allow air to flow into the lungs until preset pressure has been reached.
  • Once the pressure is reached, a valve closes and expiration begins.

Time ventilation
  • Time-cycled ventilators deliver oxygenation over a preset time period.



anaphysio,4,ASEPSIS AND INFECTION CONTROL,9,audio,1,biochemistry,2,blog,1,BSN Notes: Assessment in Psychiatry,6,BSN Notes: Burns,11,BSN Notes: Care of Terminally Ill Patients,6,BSN Notes: Childhood and Developmental Disorders,6,BSN Notes: Common Behavioural and Social Problems,4,BSN Notes: Common Childhood Diseases,7,BSN Notes: Common Signs And Symptoms,32,BSN Notes: Community Mental Health Nursing,12,BSN Notes: Critical Care,12,BSN Notes: Disaster and Emergency,15,BSN Notes: ENT,8,BSN Notes: Eye,25,BSN Notes: History and Assessment,24,BSN Notes: Introduction of Psychiatry,27,BSN Notes: Legal Issues In Psychiatry,4,BSN Notes: Medication Administration,24,BSN Notes: Neuritic_Stress related and Somatization Disorders,10,BSN Notes: Neurology,6,BSN Notes: Oncological Nursing,8,BSN Notes: Organic Brain Disorders,1,BSN Notes: Oxygenation,3,BSN Notes: Personality_Sexual and Eating Disorders,5,BSN Notes: Principles and Concepts of Psychiatry Nursing,2,BSN Notes: Psych-pharmacology and Other Treatment Modalities,30,BSN Notes: Psychiatry Emergencies and Crisis Intervention,4,BSN Notes: Psychosocial Needs,5,BSN Notes: Schizophrenia and othe Psychotic Disorders,4,BSN Notes: The healthy child,5,BSN Notes: TNPR,9,BSN Notes: Urinary Elimination,14,chn,41,clinicalkannada,4,clinicals1,40,clinicals2,13,clinicals3,33,clinicals4,17,Code of Ethics,3,community,7,Critical thinking,7,drugs,3,Epidemiological Approach,4,Equipment & Linen,9,Equipments & Linen,1,Etics and Legal,1,exa,1,exam,11,featured,19,fon,142,fon3,142,fun,1,geriatric,1,goingbacktodraft,673,graphic,1,Growth and Development,5,he,115,hotspot,6,kannada,63,language,1,Machinery,10,Medications,1,Memory Tools,9,mhn,127,microbiology,3,misc,2,mnemonics,48,msn,137,NCLEX,13,ncp,27,news,4,obg,28,OBG Medications,1,Peri- operative Nursing,2,pharma,29,Physical Examination and Assessment,9,Psychology,2,Pulse,7,resources,1,Respiration,4,Transitional care,1,Ventilators,5,voice,2,
item Ventilators: Indications,Methods
Ventilators: Indications,Methods
Loaded All Posts Not found any posts VIEW ALL Readmore Reply Cancel reply Delete By Home PAGES POSTS View All RECOMMENDED FOR YOU LABEL ARCHIVE SEARCH ALL POSTS Not found any post match with your request Back Home Sunday Monday Tuesday Wednesday Thursday Friday Saturday Sun Mon Tue Wed Thu Fri Sat January February March April May June July August September October November December Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec just now 1 minute ago $$1$$ minutes ago 1 hour ago $$1$$ hours ago Yesterday $$1$$ days ago $$1$$ weeks ago more than 5 weeks ago Followers Follow THIS CONTENT IS PREMIUM Please share to unlock Copy All Code Select All Code All codes were copied to your clipboard Can not copy the codes / texts, please press [CTRL]+[C] (or CMD+C with Mac) to copy