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Gas exhange
gas exchange
45
Nursing
Undergraduate 4
02/13/2016

Additional Nursing Flashcards

 


 

Cards

Term
acute respiratory failure
Definition

 

•A sudden and life-threatening deterioration of the gas exchange function of the lungs and the failure to provide adequate oxygen or ventilation for the blood

Can be inability to diffuse O2 or inability to secrete O2

can also show

•An arterial pH of < 7.35
.

 

Term
hypoxemia
Definition

A paO2 < 50mmHg


inadequate O2 transfer (circulation)

 

Hypoxic-not because low pulse ox-> from poor o2 transfer

 

Term
hypercarbnia
Definition

A paCO2 > 50mmHg

 

•increased paCO2, elevation in circ CO2

 

Term
hypercapnia
Definition

 

•- insufficient CO2 removal which then increases PaCO2 (hypercarbia)

COPD-patients don’t eliminate CO2, inhale fine

 

Term

 

•Inability to properly exchange (diffuse) O2 and (eliminate) CO2 are caused by 2 problems….

 

Definition

 

•Ventilation error

 

•Perfusion error

 

Term
V/Q
Definition

 

•The healthy adult lung receives each minute an alveolar ventilation of about 4 liters and a pulmonary blood flow of 5 liters. What is the average resting ventilation:perfusion(V/Q) ratio?

 

•

 

•V/Q = (4L/min) /(5 L/min) = 0.8

 

•Normal V/Q ratio is 0.8

 

•

 

•A normal ventilation-to-perfusion relationship is required to keep PaCO2 and PaO2 in the normal range.

 

Term
V/Q mismatches
Definition

 

•A V/Q ratio < 0.8 indicates dead-spacing in the lungs

 

•indicating a relative shunt. (Problem ventilating)-air cannot get in and reach aveloi, but circulation is fine

 

•

 

•A V/Q ratio between 1 and infinity indicates ventilation with no perfusion-there is ventilation but there is no blood (Ex PE) 

 

Term
shunt
Definition

perfusion without ventilation

V/Q=0

Term
dead space
Definition

vent w/o perfusion

V/Q of infinity

Term
vent and perf is at it's greatest when..
Definition

 

•When?

 

•The client is awake

 

•Where?

 

•The base of the lungs

 

•Why?

 

•Gravity

 

•Both on perfusion and ventilation

Normal is when its at its greatest

Why you sit a patient up if their struggling to breathe, can enhance ventilation/perfusion in that position

Px in respiratory distress->best position-high fowlers (even over semi fowlers)

 

Term
ventilation
Definition
act of insp and exp of air
Term
vent failures
Definition

hypercapnia

 

•Impaired CNS function

 

•Muscular dysfunction

 

•Pulmonary dysfunction

 

Term
perfusion
Definition

transport of oxygenated blood across capillaries

 

Term
perfusion failures
Definition

hypoxemia

 

•Heart (Failure to pump)-CO could determine this, pump problem-can’t move blood through circulation

 

•Emboli (Pulmonary)-only portion of blood able to be oxygenated

 

•Shunting

 

•Infection (sepsis)-

Sepis-decreased cardiac output in septic shock, occurs fast and capillaries fail to contract and capillary collapse occurs-systemic perfusion failure

 

 

Term
most common causes of respiratory failures
Definition

 

•COPD

 

•Shock (Hypovolemic, cardiac - MI)

 

•Trauma (Head/chest/spine)

 

•Septic Shock

 

•Stroke

 

•Medication overdose-controlled substances

 

•Neuromuscular disorders – ex.amyolyticlateral sclerosis (ALS)

 

Term
s and s for hypoxemia
Definition

 

•Tachycardia

 

•Restlessness-fearful

 

•Cyanosis

 

Term
s and s of hypercapnic px
Definition

 

•Increased ICP

 

•Headache

 

•Confusion-low oxygen from more abundant CO2

 

•Lethargy

 

•Nausea/Vomiting-due to inc in intracranial pressure

 

Term
ARF general tx measures
Definition

 

•Treat underlying cause(s) may correct the problem....

 

•But you need to correct the symptoms as well.

 

 

•Give supplemental oxygen where needed

 

•Positioning (elevate HOB)

 

•Suctioning PRN

 

•Bronchodilators, steroids-Bronchodilator-Beta 2 agonist (albuterol), Prednisone, Solumedrol (IV version)-steroids

 

•Ongoing patient monitoring (ABG, pulse Ox)

 

•Prepare for intubation/mechanical ventilation

 

Term
acute respiratory distress syndrome
Definition

 

•A clinical syndrome characterized by sudden and progressive lung damage resulting in pulmonary edema, severe hypoxia, and possibly death.

 

•Characterized by decreased ‘lung compliance. (alveloi fill with fluid)

 

•Significant pulmonary edema.

 

•Death occurs in about 50% of patients, but usually as a result of non-pulmonary organ failure.

 

•Death rate much higher in sepsis (80%)

 

Term
risk factors for ARDS
Definition

 

•Severe infection (localized or systemic) most common

 

•Trauma with or without lung contusion

 

•Aspiration of gastric contents

 

•Shock

 

•Infection

 

•Pneumonia

 

•Toxic inhalation-not always happens, but can happen ex sustained exposure to toxins at work

 

•Pancreatitis

 

•Fat embolism

 

•Near-drowning

 

•Multiple blood transfusions-due to antibody reactions

 

Term
direct causes of ARDS
Definition

onset may be delayed but prgress is fast

 

•Aspiration

 

•Pulmonary infections

 

•Air, fat, or amniotic fluid emboli

 

•Near-drowning-(fluid entering the lungs), can occur hours later

 

•Pulmonary contusion

 

•Inhalation of toxic gases and dusts

 

Term
indirect causes of ards
Definition

 

•Sepsis

 

•Shock

 

•Transfusion

 

•Trauma

 

•Overdose

 

•Pancreatitis

 

•Eclampsia

 

Term
three phases of ards
Definition

acute exudative phase

fibrosing phase (avelotis)

resoltion

Term
acute exudative phase of ards
Definition
Characterized by profound hypoxia and associated with alveolar inflammation. Pro-inflammatory mediators (cytokines) lead to edema and diffuse alveolar damage. Occurs during first 2-4 days
Term
fibrosing (avelolitis phase) of ARDS
Definition
The response to injury.  Coincides with recovery over 1-2 weeks; patients continue to be hypoxic and have increased dead space and decreased lung compliance
Term
resolution phase of ARDS
Definition

 

1.may require 6-12 months.  However, most return to baseline lung functioning.

 

•

 

Term
ards summary of patho
Definition

 

•-Pathology basically involves inflammation in the alveoli, then increased pulmonary capillary permeability thus resulting in severe ventilation/perfusion mismatch. 

 

•-The blood returning to the heart is poorly, oxygenated.

-The blood returning back to the lungs (from pulmonary veins) for gas exchange is pumped through non-ventilated/non-functioning areas of the lungs (because of the edema), resulting in 'shunting

Term
assessment of ARDS
Definition

 

•Tachypnea and tachycardia can begin during the first 12-24 hours…then acute respiratory distress by the 48th hour-nothing super alarming yet

 

•Lethargy, obtundation (dull to sensitivity)

 

•Flat neck veins, no peripheral edema

 

•Moist, cyanotic skin

 

•Physiologic gallop-S3

 

Term
shunting diagram
Definition

 

•Find mean of volume ex

 

•50% vol at 95% and 50% vol at 70=82.5% hyoxemic

 

•Interventions-100% via non rebreather mask

 

•Raise 95 to 100%-mean raises to 85% percent

 

•Notice that this is why ARDS and PE’s are so deadly

 

•Oxygen dissociation curve-faster pulse ox gets away from 100, amount of oxygen circ in that paitients blood decreases

 

•Pulse ox not a tried and true method-why we do abGS

 

Term
ards assessment-auscultation
Definition

broncial breath sounds are prevented from being converted to vesicular breath sounds because of consilidation

 

Hear fluid, significantly decreased breath sounds

 

Normal is resounance

 

Why copd breath sounds dec-barrel chest-enlarged chest wall but not lungs-stethoscope further from lungs physiologically, lungs not fully expanding, decelasiticity,

 

Term
ARDS percussion
Definition
fluid sounds dull
Term
treatment modalities for ARDS
Definition

 

•Treatment is very challenging.

 

•ARDS develops and becomes more severe over 12-48 hours.

 

•Does not respond to supplemental oxygen therapy.

 

•Always intubated...but even this is difficult due to 'stiff lungs.’ (decreased lung compliance)

 

Term
treatment of ARDS
Definition

 

•Treat underlying condition(s).

 

•Treat potential infection.

 

•Continuous patient monitoring (Fluid Volume, ABG)

 

•Little help with medications (diuretics, antihypertensives)

 

•Fluid balance (daily weights, caution with IV fluids)

 

•Probable sedation while intubated and mechanically ventilated.

 

•Mechanically ventilated with use of PEEP (Peak end expiratory pressure-keeps amount of continuous pressure in the lungs and always keeps the airways as open as possible w/o any effort of px-so when the lungs deflate they don’t totally deflate)

 

Term

 

•CAVH (continuous arteriovenous hemofiltration)

  for ARDs

Definition

 

•Helps in the management of fluid overload and acid-base imbalance.

 

•Blood circulates usually without a blood pump through a small hollow-fiber hemofilter. 

 

•Access to the circulation is by the femoral artery and vein. 

 

•The patient's blood circulates through the hemofilter wherein the plasma and water is filtered and collected in the collection bag. 

 

•Replacement fluid is infused into the venous return line where heparin may also be administered. 

 

•no oxygenation happening-but it's helping with fluid displacement

 

Term
advantages of CAVH for ARDS
Definition

 

•It is very effective in removing fluid which may help patients in pulmonary edema or acute respiratory distress syndrome.

 

•It does not cause hemodynamic instability since there is little change in plasma osmolarity.

 

•Allows control of electrolyte and acid-base balance.

 

•The procedure is relatively simple and does not require highly technical equipment, unlike hemodialysis. 

 

Term
PE
Definition

 

•The obstruction of the pulmonary artery or branch(s) by a thrombus which originates in the venous system or the right side of the heart.

 

•Causes a ventilation/perfusion (V/Q) mismatch (greater than 0.8)

Varicose veins not risk factor for PE

Can cause shortness of breath and sudden sharp pain over affected region

May have no symptoms-pain poorly described

 

Term
causes of PE
Definition

 

•Burns

 

•Cancer-major one

 

•Pregnancy, Childbirth

 

•Genetics

 

•protein C, protein S, and antithrombin III deficiencies, Activated protein C resistance (factor V Leiden) are most common

 

•Fractures

 

•Heart attack

 

Term
more causes of PE-what is the most common
Definition

 

•Arrhythmias (A-FIB!!!)-more common

 

•Obesity

 

•Tobacco use

 

•Long-term bed rest

 

•Severe injury

 

•Stroke

 

•Surgery (especially ortho/neuro)

 

•Use of birth control pills or estrogen

 

Term
presenting signs and symptoms of PE
Definition

 

•Signs of DVT may or may not be present (Leg swelling or pain).

 

•Tachypnea, wheeze sometimes

 

•Hypoxia

 

•Tachycardia-HR>100 bpm

 

•Low-grade fever

 

•Distended neck veins

 

•Chest pain (Usually not like MI)

 

•Lungs: Clear, decreased breath sounds or egophony due to pleural effusion

 

•Acute corpulmonale (shock-systemic hypotension, syncope, cyanosis, right ventricular gallop, pleural friction rub, hemoptysis)

 

•Homan sign (pain elicited with compression of the calf)

 

•CXR and EKG changes (not diagnostic)

 

 

Term
PE Dx made
Definition

 

•Patient presentation...must meet criteria for diagnosis.

 

•Lab tests: D-Dimer, ABG, CBC, PT/PTT, and Stool guaiac prior to initiating anticoagulation therapy.

 

•EKG and CXR changes help

D-dimer not specific but is 100% sensitive

If you have a high clinical probability-d dimer needs to be performed- if pos you have a clot but it may not be a PE

 

Term
diagnostic imaging test for PE
Definition

 

•Pulmonary angiogram is the gold standard-over 99% accurate but has more risk factors

 

•Sprial CT of chest with IV contrast-less invasive, cheaper, can miss PE’s 2% of the time

 

•V/Q scan-horrible, but only says low, moderate, or high probability

 

•Cardiac 2-D Doppler if necessary (see right ventricular strain and pulmonary HTN)

 

•MRI not useful at all.

 

 

Term
treatment for PE
Definition

 

•Pulmonary angiogram is the gold standard-over 99% accurate but has more risk factors

 

•Sprial CT of chest with IV contrast-less invasive, cheaper, can miss PE’s 2% of the time

 

•V/Q scan-horrible, but only says low, moderate, or high probability

 

•Cardiac 2-D Doppler if necessary (see right ventricular strain and pulmonary HTN)

 

Need to treat what caused the PE in the first place

 

Will use warfarin (Coumadin) for treatment-does not dissolve clots

 

•MRI not useful at all.

 

Term
anticoag tx for PE
Definition

 

 

•Heparin IV/LMWH (lovenox) (Heparin usually preferred)

 

•Then warfarin.  Goal?  To stabilize INR between 2.5-3.0.  Once INR 'therapeutic,' stop heparin.

 

•Duration of warfarin absolute minimum is 3 months, usually one year, sometimes for life based on risk factors.

 

•Thrombolysis: 100 mg of tissue plasminogen activator (tPA) infused over 2 hours; must continue other forms of chronic anticoagulation.

 

•tPA very controversial based on risk and is only considered 2nd line treatment.

 

 

Term
filters for PE
Definition
greenfield filter placed in vena cava to collect formed emboli
Term
mortality and complications of PE
Definition

 

•Heparin IV/LMWH (lovenox) (Heparin usually preferred)

 

•Then warfarin.  Goal?  To stabilize INR between 2.5-3.0.  Once INR 'therapeutic,' stop heparin.

 

•Duration of warfarin absolute minimum is 3 months, usually one year, sometimes for life based on risk factors.

 

•Thrombolysis: 100 mg of tissue plasminogen activator (tPA) infused over 2 hours; must continue other forms of chronic anticoagulation.

 

•tPA very controversial based on risk and is only considered 2nd line treatment.

 

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