Test #3 Flashcards
(162 cards)
1
Q
after how long of not having adequate oral intake will the Dr consider TPN
A
about 7 days
2
Q
what are some indications for TPN
A
- chronic severe diarrhea and vomiting
- complicated surgery or trauma
- gi tract anomalies
- severe malabsorption
- GI obstruction
- severe anorexia
- short bowel syndrome
3
Q
what is short bowel syndrome and why is TPN considered for this condition
A
part of small intestine is removed or missing.
in our small intestine is where a lot of our absorption takes place.
therefore w/ short bowel syndrome you don’t have the surface area to absorb the required nutrients
4
Q
what is PPN
A
partial or peripheral parenteral nutrition
- usually administered via peripheral line
- it doesn’t meet energy and caloric requirements long term.
5
Q
what is the osmolarity of PPN and why is it not any higher?
A
900mOsm/ L
the higher the osmolarity the higher risk for phlebitis
6
Q
what does PPN do
A
support inadequate oral intake to help the body meet caloric requirements
7
Q
can the pt take in food orally if they have PPN
A
yes.
PPN can be used with or without added oral intake
8
Q
How long should someone be on PPN
A
a person should not be on PPN for more than 2 weeks.
9
Q
how often is PPN administered
A
It can be around the clock or in cycles
- in the hospital it is usually on a continuous cycle.
- if pt is going home on PPN it can be in cycles especially if they are eating orally
10
Q
what does PPN require in order to protect the vitamins
A
the bags need to be covered with a brown bag to block out the light because light can inactivate the vitamins in the solution.
11
Q
what is the osmolarity for TPN and where is it administered
A
1500-2800mOsm/L
and it is administered via central line
12
Q
why is TPN given
A
- to correct nutritional deficits
- for patients who require long term nutritional replacement to meet energy and caloric requirements.
13
Q
why are TPN bags smaller than PPN bags
A
because of the higher osmolarity of the TPN
14
Q
what do you assess for with a pt on PPN or TPN
A
- monitor electrolyte levels!
- monitor blood pressure trends
- assess weight daily
- listen to lung sounds to monitor for fluid overload
- Monitor kidney function-to make sure they can tolerate the excess volume
- monitor liver function- pts with liver failure may have a lower protein intake so adjustments need to be made
15
Q
why assess protein level prior to start of TPN
A
because the pharmacist needs to adjust the amino acids in the bag.
16
Q
what 2 labs are used to assess how severely malnourished the pt is
A
pre albumin and albumin
protiens made by the liver used to assess nutritional status
17
Q
what is the range for pre albumin and half life
A
17-40mg/dL
half life:2days
18
Q
what does the body use pre albumin for
A
- protein synthesis
- bind and transport proteins in the body
19
Q
why do we look at pre albumin
A
to determine if the patient is getting enough protein and to figure out what the patients malnutrition risk is or if they already are malnourished
and to monitor parenteral nutrition and to assess if it is effective
20
Q
what lab value is sensitive to change in our protein energy status
A
pre albumin
it more closely resembles what the protein dietary intake is.
21
Q
what level of pre albumin would indicate the patient is severely malnourished
A
a pre albumin level of <10mg/dL
22
Q
if a patients pre albumin level is <5mg/dL what will that indicate
A
severe protein depletion
23
Q
what is albumin range and half life
A
3.5-5.0g/dL
half life 20-24 days
24
Q
what do we need albumin
A
- protein type that we need to maintain growth and repair tissues.
- it also carries nutrients and hormones
- maintains intravascular pressure
- inhibits ascites from forming
25
what does albumin tell us
whether a patient has been chronically malnourished or not.
| it cannot tell us if the pt is acutely malnourished
26
what will happen if a patient is deficient in albumin and is started on peripteral nutrition
the pt will develop edema because the decreased albumin causes a decrease in colloidal pressure thus allowing fluid to move out of the vessels.
27
what does a decreased albumin level indicate
- severe malnutrition
| - liver and kidney disease
28
what does an increased albumin level indicate
dehydration
vomitting
diarrhea
(caused from concentration d/t volume loss)
29
what are the macro nutrients in PN
-water=base
-dextrose
-amino acids
-lipids- (in separate bag but infused with TPN)
plus added electrolytes vitamins trace elements
30
who is in charge of monitoring pts electrolyes
the pharmacist because the have to adjust the therapy
but
YOU need to assess their levels as well and you need to call them with any abnormal levels
31
what is the primary source of calories in PN
dextrose
| it provides up to 70-85% of caloric intake
32
what is something you need to monitor in relation to the dextrose in PN
BLOOD GLUCOSE
you need to assess pts glucose response
(dextrose is gradually increased or decreased depending on pts response)
33
when checking blood glucose for pt on TPN how often are you checking the blood sugars
usually the orders will call for Q6H and then qPM
34
why are amino acids needed in TPN
because they are needed to synthesize more proteins
help conserve muscle mass
help wound healing
1 gram amino acid = 1gram protein
35
what would cause the need for a decrease in protein requirement for TPN
hepatic or renal disease
36
why is protein important when we have a lot of CHO intake
- it slows digestion
| - it blunts the hyperglycemic response
37
what are lipids for in TPN and why the body needs them
a dense source of calories
- blunts the hyperglycemic response
- need to form healthy cell membranes
38
what is the main fat source in the lipid bag
soy bean oil or
39
what do some electrolytes contain
acetate salts which are converted by the liver to bicarbonate allowing the body to maintain acid base balance.
40
what do you need to do if the pt is iron deficient and needs iron
they can either take PO iron
or
they can have IV infused separately
iron is not compatible with parenteral nutrition
(can be same site as long as it is compatible with the infusing bag)
41
what are hyperglycemia symptoms
- extreme thirst
- polyuria
- dry skin
- polyphagia
- blurry vision
- drowsy
42
what can be added as well when a person is on PN
if the person has problems controlling their blood glucose so therefore the pharmacist can add insulin to the bags to help control the glucose
43
what may need to be ordered in addition to parenteral nutrition therapy
-glucoscans
AND
-sliding insulin scale to help the body maintain glucose levels if the pt is not tolerating the therapy well.
44
what is the glucose goal for a patient on PN therapy
<200mg/dL- at the initiation of therapy
| throughout therapy we want glucose to be around 110-150
45
what is rebound hypoglycemia
a possible complication of PN
- while getting higher levels of dextrose the body secretes a larger amount of insulin to compensate leading to hyperinsulinemia
- this condition can result when he infusion is stopped abruptly- therefore there is an abrupt drop in glucose and an abundance of insulin causing hypoglycemia
46
what do you need to do when stopping parenteral nutrition therapy
gradually decrease to prevent rebound hypoglycemia
| - you need to decrease the rate by half and run at that rate for an hour and then you can turn it off
47
what do you do if the PN bag is empty when you check on your pt
-call the pharmacy
-hang D10W or D20W running at the same rate as the PN
because you need to prevent rebound hypoglycemia
- you do not need an order to hang d10 or d20 in this situation because the PN order covers this because you don't want PN therapy to abruptly stop
48
S/S of hypoglycemia
```
shaky
lethargic
head ache
blurry vision
cold/clammy
tachy
sweaty
```
49
what are complications of parenteral nutritional therapy
- hyperglycemia
- rebound hypoglycemia
- refeeding syndrome
- fluid overload
50
How does refeeding syndrome occur
when we supply a severely malnourished or chronically starved pt parenteral nutrition
(these pts have gone through glycolysis and have started gluconeogenesis so their main source of energy is protein and fats)
when we reseed with PN and use dextrose as 30% of caloric intake this stimulates increase in insulin which pulls glucose into cells but insulin also pulls K+, Mg and phosphate into cells as well.
-so the already depleted electrolyte levels in the blood become even more depleted
51
what are the hallmark conditions of referring syndrome
hypophosphatemia
hypokalemia
hypomagnasemia
52
s/s of refeeding syndrome
mostly related to hypophosphatemia
- cardiac dysrhythmias
- repsiratory arrest
- neurological disturbances
53
what is HTN a risk factor for
```
CAD
CVD
HF
renal failure
PVD
```
54
what are the non modifiable risk factors for developing HTN
-family history-30-40%
-Age- vessels lose elasticity with age-
-Gender-
more common in males up to the age of
45
more common in women after the age of
65 (d/t onset of menopause)
equal occurrence in men and women 45-64
-Ethnicity-
african americans are more sensitive to salts causing them to be more at risk for HTN
Hispanics at greater risk b/c they are less likely to receive tx and management is lower and lower level of awareness
55
for african americans how much salt will cause an increase in BP
1/2 teaspoon of salt can raise BP 5mmHg
56
how do African Americans control their BP
have a low sodium diet and usually need more than one drug to help lower BP
57
what are the modifiable risk factors for HTN
- lack of physical activity- this leads to being over weight and being overweight puts more strain on the heart.
- 11-20lb weight gain can cause a measurable amount of increased BP
- Diet- high calorie, fat, sugar-increases obesity...high salt attracts more water leading to more strain on the heart (especially for african americans)
- Alcohol-
- smoking & second hand- increase risk of artery damage
- Stress-
58
```
stages of hypertension
normal
pre hypertensive
hypertensive stage 1
hypertensive stage 2
hypertensive crisis
```
staged on the average of 2 or more properly measured BP readings on 2 or more office visits
-Normal-- SBP <120 AND DBP <80
- Pre hypertensive- SBP 120-139 OR DBP 80-89 (lifestyle modifications need to start
- HTN stage 1--SBP 140-159 OR DBP 90-99
- HTN stage 2--SBP 160 or higher OR DBP 100 or higher
- HTN crisis--higher than SBP 180 OR DBP higher than 110
59
for a pt over the age of 60 w/ no diabetes or ckd what is their BP goal
SBP <150
| DBP <90
60
for pts with no CKD or diabetes present what would be the rx treatment
```
for non black pts:
initiate thiazide diuretics
Ace inhibitors
ARBs
calcium channel blockers
```
For black pts
initiate thiazide diuretics
calcium channel blockers
61
for pts with diabetes but no ckd what would the rx treatment be
```
for non black pts.
initiate thiazide diuretics
Ace inhibitors
ARBs
calcium channel blockers
```
For black pts
initiate thiazide diuretics
calcium channel blockers
62
for pts with CKD and with or without diabetes what is the Rx treatment
for all races
initiate ACE inhibitors or ARBs
alone or in combo with other drug classes
63
what are contributing factors for primary HTN
- increases SNS activity
- increased Na+ intake
- over production of aldosterone
- increased BMI
- Diabetes
- Smoking
- chronic/ excess use of alcohol
64
what is 2ndary HTN
HTN from an underlying cause that can be identified and corrected
65
how does HTN affect the vessels
-can lead to angiopathy(arteries and arterioles)-
the vessels thicken as a protective measure against the increased pressure but over time the thickening causes narrowing of the vessel and also decreases in flexibility
-HTN plays a role in atherosclerosis- plaque formation which causes narrow, less flexible vessels
66
how does HTN affect the heart
-d/t the antipathy and the atherosclerosis formation caused from HTN
blood can flow through the heart very well leading to coronary artery disease, chest pain and MIs
67
how does HTN affect the brain
plaques can form in the common carotid artery inhibiting blood flow leading to a stroke and TIAs
ppl who have TIAs are more at risk for having full stroke
68
how does HTN cause PVD. what happens
HTN can lead to atherosclerosis which leads to PVD- intermittent claudication
leg pain caused by ischemia
excess activity increases the blood flow but because of the plaque formation blood cannot flow easily through the lower extremities resulting in pain
69
How does HTN affect the kidneys
it causes nephrosclerosis
there are a lot of arteries that supply our kidneys so when those arteries become atherosclerotic our kidneys will decline in function and are unable to filter as well.
nephrons begin to die and kidney function decreases.
renal disease can develop from ischemia from the arteries supplying kidneys becoming atherosclerotic
those nephrons will eventually atrophy and die affecting the glomerulus.
70
how does HTN affect the retina
the vessels in the eye become atherosclerotic causing small hemorrhages leading to blurred vision or vision loss.
pts with severe retinal damage may see spots
71
what is the short term mechanism for bp
the ANS is stimulated and the Baroreceptors are activated when they sense low BP
the transmit a signal to the brain stem that will cause an increase in cardiac contractility, increase HR and increase vasoconstriction causing an increase in BP
When baroreceptors sense an elevated BP they send inhibitory signals to the brainstem
causing a decrease in HR, decreased contractility and vasodilation
over time if BP is not managed the baroreceptors become accustomed to the higher blood pressure and accept it as normal
72
Explain the RAAS system
The liver synthesizes and releases angiotensinogen
the kidneys release renin (in response to decreased bp, low volume, low Na, high urine na+)
- RENIN converts angiotensinogen to angiotensin I
- angiotensin I circulates until it comes in contact with angiotensin converting enzyme (secreted by endothelial cells of LUNGS)
-ACE converts angiotensin I to angiotensin II
-Angiotensin II stimulates vasoconstriction=increased BP
also stimulates adrenal cortex to stimulate the release of aldosterone
- aldosterone increases reabsorption of Na+ and H2O in distal tubule = increased ECF volume and increasing BP
- (when Na+ and H2O reabsorbed K+ is lost)
73
what happens when there is a long term presence of angiotensin II
-can cause cardiac remodeling=
enlargement of heart cells.
collagen deposits that form scar like tissue in the heart.
leading to Heart Failure b/c an enlarged heart with scar tissue cannot maintain the normal cardiac output
also causes release of chemical mediators of atherosclerosis
-deposits fatty plaques in vessels and heart that leads to MI and Strokes
74
How to identify name of ACE inhibitors
they have "pril" at the ending
75
what is a first line drug for HTN
ace inhibitors
76
what is the job of an ace inhibitor
to inhibit conversion of angiotensin I to angiotensin II
-reduces systemic vascular resistance and decreasing aldosterone secretion
77
what is a benefit of ace inhibitors
because of what ace inhibitors do, they help the heart.
it can stop the progressive cardiac remodeling of the heart.
so this is why ace inhibitors are cardioprotective-they benefit in the tx of heart failure
the protect the renal system because they cause efferent arteriole to vasodilate which can decrease glomerular filtration pressure.
78
common side effects of ace inhibitors
- dry cough
- ED
- orthostatic hypotension
- possible hyperkalemia-d/t the excretion of Na+ and h2o b/c the inhibition of aldosterone
79
who would be more at risk for hyperkalemia when taking ace inhibitors
ace inhibitors are 100% metabolized and excreted by kidneys-
pts with CKD
using spironolactone (K+ sparing diuretics)
K+ supplements
80
what are ARBs
angiotensin II receptor blockers
-ends in "TAN"
block angiotensin II
in the arterial smooth muscle and in adrenal gland thus blocking the secretion of aldosterone
also receptors in the heart- preventing cardiac remodeling
81
which med is best used for heart failure
Ace inhibitors because the ace inhibitors block the formation of angiotensin to and with ARBs the angiotensin II is already formed
82
what else is losartan used for
diabetic nephropathy
83
what are adverse effects of Losartan
- Hypotension
- Hyperkalemia
- hypoglycemia
84
would losartan and lisinopril be used together
NO because they have a similar action
85
what are alpha 1 blockers
Doxazosin and tamsulosin
the alpha 1 receptors are in the arteriole and venous smooth muscle (these vessels feed the heart, renal and GI system)
activation of these receptors causes constriction therefore blocking the receptors causes vasodilation =decreased resistance = decreased BP
when we block the receptors -b/c we have them in our bladder- it will relax the muscle in the bladder which is why tamsulosin is used for BPH
86
what are adverse effects of alpha 1 blockers
dizziness
head ache
decreased libido/sexual dysfunction
orthostatic hypotension (when first dose given within 24 hrs)
87
when should a person take an alpha 1 blocker
at bedtime to reduce the risk of orthostatic hypotension and falling causing further injury
88
what are alpha 2 agonists
clonidine
- acts in the CNS to decrease sympathetic activity
- the activation of alpha 2 receptors causes vasodilation
-helps control BP by stimulating alpha 2 receptors in the PRE synapse to accept more norepinephrine that way less nor epinephrine in the synaptic cleft. (keep more norepinephrine in the pre synapse)
{norepinephrine causes vasoconstriction}
89
what are side effects of alpha 2 receptors
dry mouth
drowsiness
withrdawal phenomenon-caused from an abrupt stop of taking medication that can lead to rebound HTN and increase HR
90
what should a pt do if they are stopping clonidine
they need to titrate down to prevent withdrawal phenomenon
91
who should receive clonidine
pts who are very HTN resistant. Pts who are on other hypertensives and still have HTN
not a first line drug
92
what is the vasodilator drug
| what are they used for and in conjunction with?
Hydralazine (most common)
not first line
used for moderate to severe HTN
usually in conjunction with diuretic
93
what does hydralazine do
help dilate blood vessel
and relax arterial smooth muscle to reduce vascular resistance
prevent arterial walls from tightening and narrowing
helps increase blood flow and help heart not pump as hard
94
what is a possible adverse reaction of hydralazine
has a higher probability of hypotensive effect which can cause the body to sense a low perfusion causing the heart to increase cardiac output resulting in tachycardia
other possibilities
edema and orthostatic hypotension
95
what is DASH
dietary approaches to stop HTN
emphasizes decrease in take of salt and sugar
increase more fruits, vegetables,
decreased red meats, fat free or low fat dairy
increase whole grains,
increase chicken
increase beans seeds nuts fiber
96
what should the Na+ intake be
a normal healthy adult = < or = 2300mg/day to maintain normotension
African Americans, HTN, diabetics, CKD= < or =1500mg/day
97
what are some lifestyle modifications for maintaining healthy bp
-lose weight- BMI brown 18.5-24.9
(also helps improve glucose uptake)
-increase physical activity (30min) 4x/wk
-decrease alcohol use
-no tobacco-nicotine causes -vasoconstriction- increases BP and risk for CVD
-learning how to deal with stress in a healthy way
-compliance with drug therapy
98
what is asthma
inflammation, swelling and mucus production
| bronchospasm
99
what triggers asthma
- allergens
- air pollutants
- respiratory infections
- Gerd
- exercise
- drug therapy
100
what are s/s of asthma
```
SOB
wheezing,
cough
chest tightness
prolonged expiration
hyperinflation of alveoli (air is trapped in alveoli)
```
101
what is the treatment for asthma
selective beta 2 adrenergics
102
what are the short acting beta 2 agonist
albuterol
| -used to relieve acute symptoms
103
how does albuterol work
it selectively binds to beta 2 receptors which facilitate bronchial dilation,
mucous drainage
inhibiting release of inflammatory chemicals such as histamine and interleukins
104
what is the onset and duration of action for albuterol
onset- 5-15minutes
duration 2-6 hours
why it is a rescue medication
105
side effects of albuterol
nervousness
shaky
tremors
palpitation
106
what is a long acting beta 2 adrenergic
salmeterol diskus
107
what is salmeterol diskus used for
long term prophylaxis and long term therapy for COPD
108
what is the duration of action for salmeterol diskus
up to 12 hours with a slow onset
109
what is a side effect of salmeterol diskus
headache
110
what are leukotrienes
a substance that is released during an asthma attack
they are primarily responsible for bronchiole constriction
mucus production and edema
111
what is the leukotriene receptor antagonist
Montelukast
| non steroidal
112
what does montelukast do
binds to leukotriene receptors in respiratory tract and blocks them
this vasodilates the bronchioles
decreases mucous secretions and
improve edema
113
when would you give montelukast
prevention and tx of chronic asthma
NOT for acute attacks
also can be used for
exercise induced asthma attack.
(must take at least 2 hrs prior to exercise)
114
lifestyle modifications for asthma
reduce/avoid triggers of asthma attacks
- keep windows closed during pollen season
- keep home clean/reduce dust
- reduce pet dander (hypoallergenic animal)
- remove carpeting (carpet harbors dust)
- cover nose and mouth in cold weather
- control heartburn and gerd (medications)
use medications such as short term for acute attacks
and use long term meds to decrease risk of an attack
115
what is COPD
a progressive pulmonary disease that is a combination of emphysema and bronchitis
characterized by persistent airflow limitation
116
what is chronic bronchitis
the presence of excess mucous production in the lower respiratory tract
117
how is chronic bronchitis diagnosed
when cough and bronchitis occurs for at least 3 months in a 2 year period
118
what is emphysema
results from years of inflammation
loss of elasticity of bronchioles and damage alveoli
these alveoli collapse and trap air
causing decreased perfusion, decreased gas exchange
119
what are the risk factors for COPD
exposure to cigarrette smoke
smoking any tobacco products
exposure to fumes, chemicals that can irritate and damage lung airways
120
what are the treatments for COPD
we only have drugs to treat the symptoms we do not have any drugs to cure COPD
121
what are the manifestations of COPD
- chronic cough
- sputum production
- dyspnea(especially upon exertion)
- barrel chest-from using more accessory muscles to breathe
- wheezing
- clubbed fingers
- fatigue/weakness
- activity intolerance
- gas exchange abnormalities(retaining CO2)
- increased susceptibility to infections which lead to COPD exacerbations
122
what are lifestyle modifications for ppl with COPD
- smoking cessation
- avoid 2nd hand smoke
- Breathing exercises
- nutrition- (pts expel so much energy trying to eat) suggest higher caloric and protein but smaller meal
- increase fluid intake(they become mouth breathers so they have dry mouth and loss of saliva. fluid also helps liquify sputum)
- exercise- increases appetites, sleep and circulation
- preventiontion-pneumococcal, flu vaccines
- low level oxygen therapy
123
what are breathing exercises for a COPD pt
teach them diaphragmatic breathing - using their belly to breath rather than their chest
and
pursed lip breathing to help expel as much CO2 as possible
124
what is the goal for COPD oxygen saturation. what is specific about their drive to breathe
85-92%
as they get more severe, that o2 sat decreases a little
COPD pts depend on a hypoxic drive to breathe
(the body becomes accustomed to chronic CO2 retention- so eventually low levels of oxygen and high levels of co2 is their drive)
125
what is the max amount of O2 you should give to a COPD pt
2L
126
what is acetylcholine
released by the PNS
| it binds to receptors on bronchial tree causing bronchiole constriction
127
what is the short anticholinergic drug and what does it do
ipratropium inhaler
| - it relieves and prevents bronchospasm of asthma and COPD
128
what is ipratropium commonly used with
albuterol
| for a nebulizer treatment
129
what is the purpose of the duo neb
anti cholinergic response- decreasing constriction
and
beta 2 agonist response inhibits bronchodilation, decreases mucous production and inhibits release of inflammatory chemicals
130
what is the long acting anticholinergic
tiotroprium
-dry powdered inhaler
dosed daily d/t long duration of action
131
what is tiotroprium used for
maintenance and prophylaxis of bronchospasm for pts with COPD
132
what is the adverse effect of anticholinergics
dry mouth
133
what is the corticosteroid inhaler
fluticasone
| -dry powder inhaler
134
what does fluticasone do
- anti-inflammatory
- long term management of asthma or COPD
- decrease edema and frequency and severity of asthma attacks
135
what is advair
fluticasone AND salmeterol (long acting beta 2 adrenergic)
136
what is the purpose of advair
decrease inflammation
to bronchidilate
and decrease mucous production
137
how often is fluticasone/solmeterol used
twice a day
138
what is Breo
fluticasone and vilanterol(beta 2 antagonist)
139
how often is breo taken
once a day
140
what are adverse effects of corticosteroid inhalers
- headaches
- hoarseness
- oral/esophageal candidiasis (d/t corticosteroid)
141
what do pts need to do after using corticosteroid inhaler
rinse mouth after each use and spit out. this will prevent oral/esophagela infections
142
because fluticasone s a steroid what does the combo therapies increase the risk of
pneumonia and upper respiratory infections
| b/c the steroid decreases the immune response to respond to inflammation
143
what are systemic corticosteroids
methylprednisolone
and
prednisone
144
what does methylprednisolone and prednisone do
help relieve airway inflammation
and act as anti inflammatory mediators so they inhibit the inflammatory response
decrease mucous production and edema
145
what is a must do when stopping prednisone
it must be tapered down. do not abruptly stop because it can cause adrenal insufficiently
146
what is adrenal insufficiency
this happens b/c the corticosteroids block the release of cortisol
147
what are adverse effects of systemic corticosteroids
```
hyperglycemia
euphoria
depression
HTN
decreased wound healing
ecchymosis
peptic ulceration
```
148
what is different of the skin on a pt who has been taking a corticosteroids
they have very fragile think skin and the skin color turns brown
149
what are pulmonary function tests used for
to evaluate lung function and diseases
used to assess air movement
-monitor disease progression
-monitor if med therapy is working and being effective
150
explain the total lung capacity
the total amount of air that is in the lungs on maximal Inspiration
-how much air your lungs can hold
151
what is residual volume
how much air remains in the lungs AFTER a pt expels the air
152
what is the forced vital capacity
- the amount of air that can be quickly and forcefully exhaled
- measure how much air you can exhale before you need to take another breath
153
what does the pH indicate
the concentration of H+ in our blood
154
what are 3 mechanism to regulate acid base balance
- buffer
- respiratory
- renal
155
how does our body maintain pH by using buffers
bicarb and phosphate bind to acid to neutralize strong acids-reacts immediately
156
how does respiratory system help maintain pH
lungs responsibility to breath in o2 and breathe out CO2
157
how do the kidneys maintain acid base balance
if the body is acidotic
-kidneys reabsorb bicarb from tubule fluid and get rid of CO2
if the body is alkalotic
-the kidneys will get rid of bicarb and hold on to more H+
158
what is the normal pH value
less than
greater than
normal
7.35-7.45
acidosis <35
alkalosis >45
159
what is normal CO2 range
less than
greater than
35-45
>45- acidosis-hypoventilating
<35-alkalosis-hyperventilating
160
what is the normal bicarb
less than
greater tahn
normal 22-26
<22-acidosis
>26 - alkalosis
161
what are conditions of metabolic acidosis
- diabetic acidosis
- diarrhea-loss of bicarb
- renal failure- kidneys not able to get rid of acid load so they retain H+, and not able to reabsorb bicarb
- schock-d/t lack of blood flow
- salicylate OD
162
what are causes of metabolic alkalosis
- loss of gastric secretions(losing stomach acid)
- over use of antacids
- K+ wasting diuretics (furosemide) because these diuretics cause K+ to be pulled out of cells and excreted so H+ enters the cell. (they switch places to maintain ion balance in cell) leading to alkalosis
