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Respiratory system notes

Review respiratory physiology and pulmonary function tests in one note.
Connect obstructive patterns with their key spirometry findings.

Alveolar ventilation

Calculate effective ventilation after dead space and connect it with PaCO₂.

Gas exchange

Separate diffusion limitation, V/Q mismatch, and shunt when evaluating hypoxemia.

Pulmonary function tests

Use FEV₁/FVC and bronchodilator response to organize obstructive patterns.

Obstructive ventilatory defect

Increased airway resistance lowers FEV₁/FVC and prolongs expiration.

A reduced FEV₁/FVC ratio is the key finding.
Expiration is prolonged and air trapping can develop.
Interpret bronchodilator response together with symptom change.

Spirometry

Confirm both a reduced FEV₁ and a low FEV₁/FVC ratio in an obstructive pattern.

AsthmaReversible airway obstructionWorse at night or after exercise

COPDPersistent airflow limitationSmoking history and chronic cough

Obstructive ventilatory defect

Increased airway resistance lowers FEV₁/FVC and prolongs expiration.

A reduced FEV₁/FVC ratio is the key finding.
Expiration is prolonged and air trapping can develop.
Interpret bronchodilator response together with symptom change.

Spirometry

Confirm both a reduced FEV₁ and a low FEV₁/FVC ratio in an obstructive pattern.

AsthmaReversible airway obstructionWorse at night or after exercise

COPDPersistent airflow limitationSmoking history and chronic cough

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Bleeding disorders review

Link hemostasis, screening tests, and differential clues
Primary hemostasis → coagulation → tests → differential
Read the bleeding pattern before the laboratory pattern
Before exams, scan pathways, test patterns, and next steps

Primary hemostasis

Vessel injury → vasoconstriction → platelet plug
vWF–GPIb mediates platelet adhesion
ADP and TXA₂ amplify platelet activation
GPIIb/IIIa–fibrinogen drives aggregation
Mucosal bleeding and petechiae suggest this pathway

Secondary hemostasis

Coagulation factors generate thrombin and fibrin
Intrinsic: XII → XI → IX + VIII
Extrinsic: tissue factor + VII
Common: X + V → II → I
Fibrin stabilizes the initial platelet plug

Initial hemostasis tests

CBC/platelets · PT/INR · aPTT · fibrinogen
PT screens extrinsic and common pathways
aPTT screens intrinsic and common pathways
Bleeding pattern → medication → test pattern
Normal screens do not exclude every mild disorder

Coagulation cascade

Intrinsic and extrinsic arms converge at factor X
Xa + Va convert prothrombin to thrombin
Thrombin converts fibrinogen to fibrin
Factor XIII cross-links and stabilizes fibrin

PT/aPTT pattern

Use the prolonged test to localize the pathway
PT only: factor VII or extrinsic-pathway clue
aPTT only: VIII · IX · XI · XII or inhibitor
Both: common pathway · liver · DIC · medication
Interpret platelet count and fibrinogen together

Mixing study

Mix patient plasma with normal plasma 1:1
Correction suggests a clotting-factor deficiency
No correction suggests an inhibitor or medication
Incubation can reveal a time-dependent inhibitor
Confirm with factor and inhibitor assays

Factor deficiency

Prolonged aPTT corrects after mixing
Measure factors VIII · IX · XI as indicated
Hemophilia A/B are key inherited examples
Connect results with personal and family history

Inhibitor present

Prolonged aPTT fails to correct
Consider lupus anticoagulant or a factor inhibitor
Exclude anticoagulant medication interference
Use confirmatory assays with the clinical context

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Respiratory system notes

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Obstructive ventilatory defect

Higher airway resistance lowers FEV₁/FVC and slows expiration.

Spirometry

Check for a full inhale, forceful exhale, and repeatable curves. FVC is total exhaled volume; FEV₁ is the volume exhaled in one second. Confirm test quality before interpreting the values.

FEV₁/FVC interpretation

Obstruction lowers both FEV₁ and the FEV₁/FVC ratio. A ratio below the age-adjusted lower limit supports airflow obstruction.

Compare FEV₁ with the expiratory curve. A concave curve and lower peak flow support obstruction.

If FVC is also low, confirm restriction with lung volumes. Compare severity with symptoms and earlier results.

Bronchodilator response

Compare FEV₁ and FVC before and after a bronchodilator. A clear FEV₁ recovery suggests reversible airway obstruction.Add to chat

A positive response supports variable airflow, but does not diagnose asthma alone. If negative, repeat the test when symptoms are present. Interpret it with symptom changes and repeat measurements.

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Respiratory system notes

Alveolar ventilation

Alveolar ventilation accounts for dead space when relating tidal volume to respiratory rate. Rapid, shallow breathing can reduce gas exchange even when minute ventilation appears unchanged.

VA = (VT - VD) × RR
Hypoventilation can raise PaCO₂ and cause respiratory acidosis.

Gas exchange and the oxygen dissociation curve

O₂ diffuses from alveoli to blood, while CO₂ moves from blood to alveoli. Lower pH, higher CO₂, and higher temperature shift the oxygen dissociation curve to the right.

Right shift: oxygen is released to tissues more easily.
Left shift: hemoglobin holds oxygen more tightly.

Causes of hypoxemia

Compare V/Q mismatch, diffusion defect, shunt, and hypoventilation using the A–a gradient and response to supplemental oxygen.

V/Q mismatch: increased A–a gradient and usually improves with oxygen.
Shunt: PaO₂ improves only slightly despite oxygen.
Hypoventilation: PaCO₂ rises while the A–a gradient may stay normal.

Obstructive ventilatory defect

Asthma and COPD characteristically reduce FEV₁/FVC. Expiration becomes prolonged, air trapping develops, and residual volume can increase.

Chronic bronchitis: productive cough for at least 3 months in 2 consecutive years.
Emphysema: alveolar wall destruction reduces elastic recoil.

ABG approach and PFT interpretation

Low pH with high PaCO₂ suggests respiratory acidosis. With chronic compensation, HCO₃⁻ rises as well.

Reduced FEV₁/FVC: obstructive pattern
Reduced TLC: restrictive pattern
Reduced DLCO: consider diffusion or pulmonary vascular disease.

QuizFrom notes

Respiratory system notes2 / 5

Completed

Which equation is used to calculate alveolar ventilation?

(VT − VD) × RR

2

Which condition shifts the oxygen dissociation curve to the right?

ALower pH · higher CO₂BHigher pH · lower CO₂CLower temperature · lower CO₂DLower 2,3-DPG · alkalemia

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RESPIRATORY SYSTEM NOTES

Obstructive ventilatory defect

04 / 06

01

Core mechanism

FEV₁/FVC↓

Increased airway resistance lengthens expiration and traps air.

Airway resistance rises
Expiration lengthens
Air trapping increases

02

Asthma vs COPD

Asthma

Variable symptoms · reversible airflow limitation

COPD

Persistent limitation · smoking history

FEV₁/FVC: < 0.70
ΔFEV₁: ≥ 12%

WordContinue

Turn medical knowledgeinto clear study notes.

Build one study note per subject.

Focus on just the concept you need.

Respiratory system notes

Alveolar ventilation

Gas exchange

Pulmonary function tests

Obstructive ventilatory defect

Spirometry

Obstructive ventilatory defect

Spirometry

See the whole note as a mind map.

Spread out confusing concepts on the canvas.

Ask AI whenever something is unclear.

Review your notes wherever you study.

Turn notes into quizzes, PDFs, and Word files.

Alveolar ventilation

Gas exchange and the oxygen dissociation curve

Causes of hypoxemia

Obstructive ventilatory defect

ABG approach and PFT interpretation

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