Respiratory system Flashcards
MC symptom in respiratory diseases?
Cough (unspecific)
Dreaded symptom in respiratory diseases?
Breathlessness
MC source of Hemoptysis?
Bronchial artery
Screening - radiology
or CT scan
All patients coming to respiratory OPD must undergo?
Pulmonary function test
Two parts of PFT?
Spirometry and diffusion capacity
What is Tiffany-Pinelli Index?
Most accurate parameter of the spirometry
Its is ratio of FEV1/FVC
(forced expiratory volume in the first one to forced vital capacity)
Tiffany-Pinelli Index range?
0.75-85
Low Tiffany-Pinelli Index?
Less than 0.70 = specific for obstructive airway disorder
Obstructive airway disorder next step after Tiffany-Pinelli Index?
Check for Broncho reversibility.
Give Salbutamol
If 12% or more improvement in FEV1 = Excellent reversibility
If 11% or less improvement in FEV1 = Partial reversibility
Excellent reversibility is gold standard for?
Bronchial asthma
Partial reversibility is gold standard for?
COPD
Normal Tiffany-Pinelli Index?
0.70-0.80
Reduction in FVC is earliest finding in?
Restrictive disorders
Restrictive disorders (FVC low) + DLCO normal indicates?
Extra-parenchymal disorders
Eg Kyphoscoliosis
Restrictive disorders (FVC low) + DLCO reduced indicates?
Parenchymal cause/Interstitial lung disease
FVC normal + DLCO low indicates?
Pulm. HTN
FVC normal + DLCO normal
Normal Pulmo functiom
What is more sensitive than chest x-ray in Pulmonology?
HRCT
Homogenous opacity in chest x-ray means?
Pneumonia
But can also be found in tumor/encysted plural effusion
Most specific finding of chest x-ray in Pneumonia?
Presence of air bronchogram
MC route of infection in Pneumonia?
Aspiration
MC cause of infection in Pneumonia?
Strap-pneumoniae
Circumscribed lesion on CXR DD?
Air-fluid level - Lung abscess
DOC Aspergillus
Voriconazole
DOC Lung abscess
Clindamycin
what is CURB 65 scored used for?
Management of Pneumonia
Max score in CURB-65?
5 Points
Most important prognostic factor in CURB-65?
Respiratory rate
CURB-65 Score indicates what mortality?
10-15%
In Community acquired pneumonia 1st line DOC?
Beta-lactum
What is seen in COAD?
Chronic bronchitis
Damage to ciliated columnar epithelium
Follicular bronchitis is due to?
Hyperplasia of bronchial associated lymphoid tissue (BALT)
Desquamative pneumonitis is interstitial lung disease in?
Smokers
Chemical pneumonitis is seen after?
Aspiration of stomach acid - Mendelson syndrome
Pneumatocele is caused by?
Staph aureus
Biot breathing in?
Lesion in brain
Cheyne stock breathing in?
Neurological disorder
Kussmaul’s breathing in?
Diabetic ketoacidosis
Popcorn calcification is seen in?
Pulmonary hamartoma
TOC COPD?
low flow oxygen
Hyperventilation leads to COW washout which is a feature of?
Type 1 respiratory failure
Partial pressure of oxygen in alveoli?
103 mm hg
Most common type of emphysema?
Centriacinar emphysema
Finger in glove is seen in?
Bronchocele
Features of Emphysema
Barrell chest
Type 1 respiratory failure
Associated with smoking
Most reliable radiography sign: flattening of diaphragm
NO CYANOSIS
IgE ab agent used in Refractory asthma?
Omalizumab
IL-5 inhibitor used in Refractory asthma?
Mepolizumab/Reslizumab
IL-4 inhibitor used in Refractory asthma?
Dupliumab
TSLP inhibitor used in Refractory asthma?
Tezepelumab
What is the indication of steroids in COPD?
Repeated exacerbation >2/year + has peripheral eosinophilia >300
MC Dreaded complication of COPD
Cor pulmonale leading to heart failure
Common clinical features of Interstitial lung diseases? (and COPD)
Chronic cough with exacerbation
Spirometry finding in ILD?
Restrictive pattern : earliest finding is reduction in FVC
Gold std test ILD?
Ground glass test opacity on HRCT
Worst radiological finding in ILD?
Honeycombing (fibrosis, irreversible damage)
If CD4:CD8 ratio is less than 1 after Broncho-alveolar lavage?
Hypersensitivity pneumonitis syndrome (HP syndrome)
Most common HP syndrome in world?
Farmer’s lung - Thermophilic actinomyces MC antigen
MC HP syndrome presentation?
Monday morning chest tightness
If silica-laden macrophages in BRL in indicates?
Silicosis- stone quarry/miner/construction worker
Can mimic TB
MC x-ray finding in Silicosis?
Apical fibrosis (can look like TB) or snowstorm appearance due to progressing massive fibrosis
If CD4:CD8 ratio is more than 3.5 after Broncho-alveolar lavage?
Sarcoidosis - MC auto-immune cause
Also mimics TB
Lung biopsy finding in Sarcoidosis?
Non-caseating granulomas
Presence of PAS positive acellular/proteinaceous material on BRL indicates?
PAP (Pul-Alveolar proteinosis)
Surfactant accumulation due to defective macrophage clearance
PAP (Pul-Alveolar proteinosis) antigen?
Anti-GM CSF positive
PAP (Pul-Alveolar proteinosis) HRCT finding?
Crazy pavement appearence
MC type of ILD associated with auto-immune disease?
NSIP
Only ILD seen in smokers?
DIP (desquamative)
MC source of Pul embolism?
Deep veins of leg
MC symptom of Pul embolism?
Breathlessness
MC sign of Pul embolism?
Tachypnea
Screening test for Pul embolism?
d-DIMER essay (if negative means no embolism)
Confirmatory test for Pul embolism?
CT Pulmonary Angiography
Risk factors of Pul embolism?
Immobilization-fracture/Malignancy
CT Pulmonary Angiography contraindicated in?
Pregnancy & contrast allergy
Alternation test: Ventilation perfusion scan (VQ scan)
Most important prognostic factor after treatment of Pul embolism?
RV function on ECG
- If normal RV function means mild case of Pul embolism (normal BP)
- If RV dysfunction/hypotension, Tx Thrombolysis = Alteplase
Anticoagulant DOC in Pul embolism?
Fondaparinux (Xs inhibitor)
Dreaded complication of Thrombolysis in Pul embolism?
Brain bleed (ICH)
Alteplase max dose in Pul embolism?
90 mg (0.90 mg/kg)
Window period of Thrombolysis in Pul embolism?
14 days = good prognosis
_______________ in indicated in all Pleural effusion cases.
Diagnostic tapping
Diagnostic tapping criteria?
Light’s criteria - transudative or exudative pleural effusion
Exudative Pleural effusion requirements?
PF protein:serum >0.5
PF LDH/serum >0.6
PF LDH >2/3rd of upper normal limit of serum LDH
MC cause of Transudative PE?
LVF
Nephrotic
Cirrhosis
Myxedema
MC cause of Exudative PE?
TB = MC
cancer neoplasm
Drug
CTDS - RA
Indication of chest tube in pneumonia?
Empyema = Pus in Pleural cavity
Gross pus
pH<7.2
Glucose <60 mg/dl
Gram stain +
Culture positive
Acid-base balance defect parameters?
pH = <7.40 Acid or >7.40 Alkalosis
pCO3/PaCO2
pH, HCO3(<24) and PaCO2 (<40) all going down means?
Metabolic acidosis
pH down but HCO3(>24) and PaCO2 (>40) going up means?
Respiratory acidosis
Normal blood pH?
7.35-7.45
<7.35 = Uncompensated
7.35-7.39 = Partly compensated
7.40 = Fully compensated
MC ABB defect in pregnancy?
R. Alkalosis
MC ABB defect in Vomiting?
M. Alkalosis
MC ABB defect in Renal disorders?
M. Acidosis
Formula for calculating Plasma anion gap?
Na-(Cl + HOC3)
Plasma Ketones increase indicates?
HAGMA due to DKA or starvation
Plasma Urates increase indicates?
HAGMA Renal failure
Plasma Lactates increase indicates?
HAGMA Shock»_space; Biguanides
Plasma PO4 increase indicates?
HAGMA Rhabdomyolysis
Plasma SO4 increase indicates?
HAGMA Salicylate/Methanol/PEG toxicity
MC lung Ca in world?
Adenocarcinoma
MC lung Ca in Asbestosis?
Adenocarcinoma
Strongest association of which Ca is seen with Asbestosis?
Mesothelioma - Pleural cancer
Strongest association of which Ca is seen with Smoking?
Small cell lung Ca
Lung cancer that looks like TB?
Sq cell ca
Lung cancer that has highest risk of hypercalcemia and pancoast syndrome?
Sq cell ca
PTHrP high
C8-T1 horner’s syndrome
SVC syndrome
MC neuro-endocrine complication
Most chemo-radio sensitive
Small cell ca
Lambert-eaton/SIDAH>ectopic ACTH
Worst prognosis