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Tachypnea

Tachypnea is an abnormally rapid breathing rate. It is defined as a respiratory rate above the normal range for age:

  • Adults: > 20 breaths per minute
  • Children: > 30 breaths per minute
  • Infants: > 60 breaths per minute

Causes

Respiratory conditions:

  • Pneumonia
  • Asthma exacerbation
  • Chronic obstructive pulmonary disease (COPD)
  • Pulmonary embolism

Cardiovascular conditions:

  • Heart failure
  • Myocardial infarction

Metabolic disorders:

  • Diabetic ketoacidosis
  • Sepsis
  • Severe anemia

Neurological conditions:

  • Brain injury
  • Stroke

Other causes:

  • Pain
  • Anxiety
  • Fever
  • High altitude

Pathophysiology

Tachypnea occurs due to:

  • Stimulation of chemoreceptors in response to hypoxemia or hypercapnia
  • Activation of pulmonary stretch receptors
  • Direct stimulation of the respiratory center in the brainstem

Clinical Significance

  • Indicator of underlying respiratory distress or systemic illness
  • Can lead to respiratory muscle fatigue if prolonged
  • May indicate impending respiratory failure

Diagnosis

  • Clinical observation of respiratory rate
  • Arterial blood gas analysis
  • Chest X-ray
  • Additional tests based on suspected underlying cause

Treatment

  • Address underlying cause
  • Oxygen therapy if hypoxemia is present
  • Mechanical ventilation in severe cases
  • Treat associated conditions (e.g., fever, pain)