Chemistry for Perfusion Flashcards
What is normal magnesium level? Where does it occur?
1.5-2.5 mEq/L, in cells and bones, is coenzyme in carbohydrate metabolism (need to make ATP)
Anions are what?
Negative ions
Are myocardial cells more dependent on extracellular calcium for contraction than skeletal muscles?
yes, ionized Ca will influence the force of myocardial contraction
Cations are what?
position ions
Do colloids ionize into solutions?
No
During primary active transport how many ATP are used to move sodium out and how many K into a cell
1 ATP, 3 Na, 2K+
Extracellular fluid makes up what percentage of total body weight?
20%
How do kidneys compensate for metabolic alkalosis?
- Decrease H+ excretion
- Increase HCO3- excretion Diomax
- Decreased HCO3- formation
How do kidneys compensate for respiratory acidosis?
Maximize HCO3- retentions, excrete more H+ w diuretics
How do you calculate total blood volume?
Wt (kg) x 70 cc/kg
How do you treat hyperkalemia?
- Hyperventilate to increase acidosis
- NaHCO3 to induce metabolic alkalosis
- CaCl to antagonize high K+ on heart. Increase contractility
- Dialysis
- Insulin if Glucose is high
How do you treat metabolic acidosis?
- increase CO
2. Increase tissue perfusion
How do you treat respiratory alkalosis?
treat hypoxia
How does facilitate diffusion work?
Carrier protein needed to help substance move through membrane
How does kidney compensate for respiratory alkalosis?
decrease reabsorption of HCO3-, increase urine excretion of HCO3-
How does simple diffusion work?
molecules move from high to low gradients
How does the kidney compensate for metabolic acidosis?
- maximize HCO3- retention or give NaHCO3
- Increase HCO3 formation
- excreting H+ via diuretics, dialysis
Hypertonic solutions cause the cells to do what? Name one
Shrink, CPG
Hypomagnesium causes what?
Muscle weakness, neuromascular irritability, development of tachyarrythmias (torsades)
Hypotonic solutions cause the cells to do what? Name one
swell, H20
Intracellular fluid makes up what % of total body weight?
40%
Isotonic solutions does what to cells and name one
no fluid shift to cells, prevents movement of H20 across membrane barriers, crystalloid
Plasma osmolality measures concentrations of what ions?
Na, K, Cl, Urea, flucose
Primary active of Ca ions occurs where and how?
cell membrane pump Ca out of the cell into SR
Primary active transport of H+ occurs where and how?
In the gastric glands and release into stomach. Combines w/ chloride to make HCl. Excess H+ eliminated from blood into urine via renal tubules
Total blood volume is how much of body weight?
7-8%
What % of adult body weight does body fluid compose?
60%
What % of body water is intracellular fluid?
2/3 or 66%
WHat % of ECF does ICF make up?
3/4
What % of ECF is plasma and where is it located?
1/4, circulates as extracellular component of blood
What agent is capable of dissolving other substances?
Solvent
What are causes of metabolic acidosis?
- Diabetes mellitus - keto-acidosis
- Tissue ischemia- lactic acid
- Heavy exercise- lactic acidosis
- Renal failure
- Impaired renal H+ secretion
- GI loss of HCO3- diarrhea
What are causes of metabolic alkalosis?
1 .Hypokalemia
- Increase renal H+ secretion bt excess aldosterone or diuretics
- GI loss of HCl- vomiting, NG suction
- Increased ECF
What are causes of respiratory alkalosis?
- Hyperventilation-stress or pain
2. Hypoxia- pneumonia, p emboli, p edema
What are causes of respiratory acidsois?
- hypoventilation
- airways obstruction
- CHF
- COPD, emphysema, ARDS
- respiratory muscle paralysis
- pulmonary fibrosis
What are normal total calcium and normal ionized calcium?
T Ca 8.5 - 10.5 mg/dl
iCa 1.13 - 1.32 mmol/L
What are some causes of hypercalcemia?
Thiazide diuretics malignancy, vitamin D excess hyperparathyroid
What are some causes of hypocalcemia?
Renal failure
alkalosis
hypomagnesium from decreased PTH secretions
banked blood
What are the 3 subcompartments of extracellular fluid?
- Interstitial fluids (ISF)
- Plasma
- Transcellular fluid
What are the causes of hyperkalemia?
Renal failure Hemolysis Excess potassium intake -cpg acidosis transfusion of old blood: 21 days old 23 mEq/L vd 1 dat 7mEq/L
What are the modes of passive transport?
Simple diffusion
Facilitated diffusion
Osmosis
Filtration
What ion is mostly intracellular?
K
organic ions
Proteins
What is a molar volume concentration solution?
Soln w/ 1 mole of solute in 1 liter soln
What is a molarity volume concentration?
Mole of solute/ liters of soln
What is a normal volume solution?
Soln 1 gram-equivalent weight of solute in one liter soln
What is acidosis?
ph
What is active transport?
Chemical energy comes from cellular chemical reactions
Substances move via concentration gradients, uses ATP
What is alkalosis?
pH >7.45
What is body fluid?
Water solution of ions and other substances
What is Co Transport (symport)?
Movement of one solute from hgih to low concentration is used to move another molecule uphill from low concentration to high concentration against a gradient i.e. A glucose symporter co transport 1 glucose molecule into cell for every 2 Na ions it imports into the cell
What is counter transport? (Antiport)
When 2 ions are bound to the same transport portien
- Na-Ca: Na moves to interior of cell as Ca moves out
- Na-H Na moves from proximal lumen of renal tubules ot the interior of the tubular cell as H+ moves from tubular cells to the tubule lumen
What is filtration?
movement of solute and solvent through a membrane by hydrostatic pressure from an area of higher pressure to and area of lower pressure ie through capillary walls
What is major intracellular cation? Normal range?
K+, 3.5-5.0 mmol/L
What is molar weight concentration?
Soln that has 1 mole solute in 1000g of solvent
What is molarity weight concentration?
Moles of solute/kg solvent
What is mole fraction weight concentration?
Ratio of # moles of substance to the # of moles of all the substances in soln
What is normal arterial HCO3? Venous HCO3?
22-28, 22-28
What is normal arterial O2 sat? Venous O2 sat?
> 95; 70-75
What is normal arterial pCO2? Venous pCO2?
33-45, 40-50
What is normal arterial pH? Venous pH?
7.35-7.45 ; 7.27-7.39
What is normal arterial pO2? Venous pO2?
8-100; 35-45
What is normal BE?
+/- 2
What is normal plasma osmolarity?
275-300 mOsm/kg
What is normal serum osmolarity?
270-320 mOsm/L
What is normality volume concentration?
gran-equivalents of solute/liters of soln
What is osmolar volume concentration?
cone of solute that is major conc x # of particles produced per molecule of soln
What is osmosis?
Movement of solvent through a semipermeable membrane from an area of lower to higher concentration of solute i.e. water follows sodium
What is passive transport?
energy comes from normal kinetic energy matter
What is phosphorous used for?
assist w/ energy transfer carbohydrate, fat lipid metabolism promotes acid-base balance
What is EKG change seen with hyperkalemia?
elevated peaked T waves
Flattened p wave
prolonged PR interval
Widened QRS
What is the EKG change seen with hypokalemia?
Flattened T wave
ST depression
What is the lipid biolayer made up of?
hydrophobic and hydrophillic phospholipid layers
What is the major ECF anion? Normal range?
Cl-, 100-110 mmol/L
What is the major ECF cation? Normal range?
Na++, 135-145 mmol/L
What is the primary intracellular anion? Normal range?
Phosphorus, 3.0-4.5mWq/L
What is the primary ion in extracellular fluid
Na
What is the role of extracellular sodium?
The sodium pump keeps Na++ out of the cells so potassium stays intracellular
What is the substance called that dissolved in fluid?
solute
What is the transcellular fluid and where is it located?
fluids outside of normal compartments, CSF, digestive juices, mucus, etc.
What is weight percent weight concentrations?
soln based on weight of solute compared to weight of solvent
What is weight-volume percent
soln that contains one g of solute/ 100ml soln
What size particles are colloids?
1-10nm
What size solute particles are cystalloids?
Less than 1nm (glucose, ions)
What will low phosphorous cause?
muscle weakness, seizures, coma, hemolytic abnemia, bleeding disorders
When is body fluid greatest?
at birth
Where is ISF located?
Surrounds cells but doesn’t circulate