SICU Flashcards
Right ventricle pumps
Deoxygenated blood to the pulmonary arteries.
Diffusion
Movement of molecules from region of higher concentration to lower.
Brainstem controls
Rate and depth of breathing
Cerebral cortex
Allows for voluntary ventilation.
Mechanoreceptors
Stretch receptors, irritant receptors, and juxtacapillary receptors.
Juxtacapillary receptors
Stimulated by engorgement of pulmonary capillaries and increases in interstitial fluid volume, which will trigger rapid shallow breathing.
Diphosphoglycerate
By product of glucose metabolism
Conditions that cause oxygen to be released easier
Acidosis, fever, increased CO2, and increased Dpg. Which is a right shift (C waveform).
Conditions that cause oxygen to become tightly bound to HGB.
Hypothermia, alkalosis, low PCO2, and decreased Dpg. Which causes a left shift (B waveform).
LEFT shift causes
More negatives for the patient.
Increased ETCO2
Caused by hypoventilation, rising body temp/ malignant hyperthermia, increased metabolism, partial airways obstruction, absorption of CO2 from exogenous source.
Decreased ETCO2
Caused by cardiopulmonary arrest, PE, sudden hypotension, massive blood loss, cardiopulmonary bypass.
ABG
7.35-7.45, PaCO2 35-45, PaO2 80-100, base excess -2 to +2, O2 sat 95%.
VBG
7.31-7.41, PaCO2 44-55, PaO2 35-40, O2 sat 70-75%.
Phrenic nerve
Innervates diagphram, someone with C3-C5 injury are dependent on mechanical ventilation.
