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Pulmonary Function Tests (PFT)
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- Adult (70 kg male): 20-25% lower in women
- Tidal volume (Vt): 500 ml
- Inspiratory reserve volume (IRV): 3100 ml
- Expiratory reserve volume (ERV): 1200 ml
- Residual volume (RV): 1200 ml
- Vital capacity (VC): 4800 ml
- Inspiratory capacity (IC): 3600 ml
- Functional residual capacity (FRC): 2400 ml
- Total lung vapacity (TLC): 6000 ml
- FEV1: 84%
- FEV2: 94%
- FEV3: 97%
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- To evaluate the patient's respiratory status, especially in patients experiencing shortness of breath or other breathing difficulty
- To evaluate the therapy for or progression of obstructive and restrictive lung disease
- As parameters for weaning patients from mechanical ventilation and as part of preoperative evaluations
- To assess airway function over time and to evaluate various therapeutic intervention
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- Tidal volume: Atelectasis, fatigue, Pneumothorax, pulmonary congestion, restrictive lung disease, tumors
- Inspiratory reserve volume: Asthma, exercise, obstructive pulmonary disease
- Expiratory reserve volume: Ascites, kyphosis, obesity, pleural effusion, Pneumothorax, pregnancy, Scoliosis
- Residual volume: Elderly individuals, obstructive pulmonary disease,
- Functional residual capacity: Adult respiratory distress syndrome
- Forced expiratory volume: Restrictive pulmonary disease
- Inspiratory capacity: Restrictive pulmonary disease
- Vital capacity: Diaphragm restriction, drug overdose with hypoventilation, neuromuscular diseases, restrictive thoracic movement.
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- Fatigue
- Lack of patient cooperation
- Smoking
- Abdominal distension or pregnancy
- Poor seal around mouthpiece
- Medications
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