Decode Medicine from OPD to ICU rounds
Neurogenic Pulmonary Edema(NPE) Introduction Neurogenic pulmonary edema (NPE) is an acute pulmonary edema syndrome occurring after a severe acute CNS insult, particularly when the neurological event causes an abrupt rise in intracranial pressure and/or massive sympathetic activation. It can be confused with: aspiration pneumonitis cardiogenic pulmonary edema ARDS pneumonia fluid overload pulmonary embolism NPE may […]
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Prone Ventilation (Prone Positioning) The landmark:PROSEVA Trial(2013) Demonstrated significant mortality reduction in severe ARDS when: Used early Used for prolonged periods-at least 16 hours a day for 4-5 days on average (i.e. for ~ 70-75% of the time) Combined with lung-protective ventilation Since then, prone positioning became standard care for severe ARDS. Physiological Basis Why
Ventilator Settings Trigger Trigger is the mechanism that initiates a ventilator breath. In simple words:”What tells the ventilator to start inspiration?” The trigger may be:Patient generated or Time generated Types of Trigger A. Time Trigger Ventilator starts breath according to set respiratory rate. Example:RR = 12/min so Breath every: 60/12 = 5 sec Ventilator triggers
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Ventilator Asynchronies Ventilator asynchrony refers to a mismatch between the patient’s neural respiratory drive and the ventilator’s delivered breath (trigger, flow, cycling, or mode). It leads to: ↑ Work of breathing (WOB) Patient discomfort Sedation escalation Delirium Prolonged mechanical ventilation Increased ICU stay Possibly increased mortalityAsynchrony is present in up to 20–40% of ventilated ICU
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WEANING FROM MECHANICAL VENTILATION WHY WEANING IS IMPORTANT Complications of Delayed Weaning Ventilator-associated pneumonia (VAP) Diaphragmatic disuse atrophy (VIDD) ICU-acquired weakness (CIP/CIM) Increased ICU length of stay Higher mortality Increased sedation exposure Complications of Premature Weaning Reintubation Aspiration Hemodynamic instability Increased mortality (especially if reintubation within 48 hrs) CLASSIFICATION OF WEANING 1️⃣ Simple Weaning Successful
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Acute Respiratory Distress Syndrome (ARDS) ARDS (Acute Respiratory Distress Syndrome) is a diffuse inflammatory lung injury characterized by: Increased alveolar-capillary permeability Non-cardiogenic pulmonary edema Severe hypoxemia Reduced lung compliance Leading to acute respiratory failure requiring oxygen or ventilatory support. Berlin Definition (2012) — Diagnostic Criteria Criterion Requirement Timing Within 1 week of clinical insult or
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Pneumothorax Pneumothorax = Presence of air in the pleural space causing partial or complete collapse of the lung. Normal pleural pressure is negative relative to atmosphere. When air enters pleural space: Negative pressure is lost Lung recoils inward Chest wall expands outward Ventilation decreases Severe cases → hemodynamic compromise Classification Type Mechanism Primary Spontaneous Pneumothorax
Pleural Effusion Normal Pleural Space Contains 5–15 mL fluid Produced mainly by parietal pleura Absorbed via pleural lymphatics Functions as a lubricant allowing lung movement Pleural effusion develops when:Fluid formation > Fluid removal Etiology Transudative Pleural Effusion Cause Mechanism Heart failure(~80% of transudates) Increased hydrostatic pressure Cirrhosis (hepatic hydrothorax)(~13% of transudates) Ascitic fluid migration Nephrotic
Acute Exacerbation of COPD (AECOPD) AECOPD by GOLD = An event characterized by worsening dyspnea, cough, and/or sputum production over less than 14 days, which may be accompanied by tachypnea and/or tachycardia and is often associated with increased local and systemic inflammation caused by airway infection, pollution, or other insults. Respiratory failure is usually due
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Community Acquired Pneumonia Community-acquired pneumonia (CAP) is an acute infection of the lung parenchyma occurring in a non-hospitalized individual or developing ≤48 hours of hospital admission, not residing in long-term care and without recent healthcare exposure. Category Definition Clinical relevance CAP Outside hospital or ≤48 hr admission Standard community pathogens HAP ≥48 hr after admission
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