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Hypercarbia

Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]

Overview

Hypercarbia means to have more than normal CO2 (Carbon dioxide) levels in the blood.

Pathophysiology

  • Value is usually obtained while performing a basic Chem-7 blood test, which tests for basic electrolyte levels from a blood sample.
  • Normal values of CO2 for anyone over 2 years of age is between 22 and 26 mmol/L.
  • Increased levels of serum CO2 are found in some disease processes such as COPD and emphysema and is related to the lung’s decreased capacity for effective gas exchange.
  • Hypercarbia has been used to induce NDE-like experiences in patients, and to treat mental disorders.
  • VA = (VT-VD) X breaths/min is a formula that can calculate ventilation in the alveolar (VA).

Causes

  • Hypercarbia can be caused by decreased tidal volume (VT), increased dead space (VD), or decreased breaths per minute.

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