orthopnea

• Definition

  Dyspnoea that develops in REcumbent Position and is relieved by sitting up or elevation of head
• MECHANISM

  • Day- gravitational effect fluid balance occur : loss of intravascular fluid into interstitial space.
  • Horizontal position, edema returns to vascular syetm increasing venus edema.
  • Failing Left ventricle, unavle to handle extra volume of blood
  • Results- Increase Pulmonary Venous and Capillary Pressure.
  • Leads to pulmonary interstitial edema and decreased airway compliance
  • Along ith elevated diaphragm, decrease vital capacity.
• orthopnea causes

  • Acute Left heart Failure
  • Extreme degree of CCF