Cardiac & Resp. - Notes Flashcards
Thoracic cavity
contains the lungs and the mediastinum
mediastinum
contains the heart and the major blood vessels
true ribs
- 1st seven pairs
- Attached to vertebral and sternum
false ribs
- 8-10 ribs
- Attach to rib above
- No sternum attachment
floating ribs
- 11-12 ribs
- No anterior attachment
Intercostal spaces
spaces b/t ribs
1st intercostal space
Count from collar bone and first rib is space 1
where do you hood up leads EKG?
intercostal spaces
Diaphragm
major muscle of respiration
External intercostal muscles
Allow inspiration and lift ribs
Internal intercostal muscles
Accessory muscles for exhalation
Primary functions of the nasal cavity
warm, filter debris, and (moisture) the incoming air
what transports air?
nasal cavity
Sinuses
- Air filled cavities with in the bones surrounding the nose
- Provide resonance during speech and decrease the weight of the skull
Pharynx
nasopharynx, oropharynx, and laryngopharynx
Nasopharynx
contains the adenoids and the openings of the Eustachian tubes which connect the pharynx to the middle ear
Oropharynx
contains the tongue and palatine tonsils.
tonsils
- filter debris
- important part of immunity
Laryngopharynx and larynx
- connect the pharynx to the trachea
- houses the epiglottis and the vocal cord
- Strong cough and spasm reflex to prevent aspiration
Upper Respiratory Tract
Nasal cavity, sinuses, mouth, pharynx, and larynx
Lower Respiratory Tract
Trachea, bronchi, and bronchioles.
Carina
division where bronchi break off into rt and lt
bronchi
Main stem
Right main stem
shorter and wider, more likely to aspirate onto this side because of the angle, listen for crackles in rt lung
left main stem
can aspirate here but more likely to go to the rt side
Terminal bronchiole
last of pure conducting
Cilia in the Lungs
- Move debris out
- Make you cough
- Bring up sputum
Lower airways
- anatomical dead space
- Lined with cilia and mucus - protectant
How much air is trapped here?
150 mL of air, never really goes anywhere, keeps lung in place
what paralyzes cilia?
Smoking, asthma, inhaled chem. exposure, pneumonia, anesthesia
bronchioles
Transition from conducting airways to respiratory zone
where does gas exchange begin?
with bronchioles which lead into the alveolar ducts, alveolar sacs and ultimately the alveoli
how many alveoli does an adult have?
300 million
what do type II cells produce?
surfactant
surfactant function
- Keep alveoli open
- Lubricates
- Reduces surface tension
- Prevent alveolar collapse
- Keep lungs inflated
- Limits expansion - prevents over inhalation
Lung compliance
lost ability to recoil, decreased surfactant
who has a barrel chest?
Emphazema and COPD
what is the chief organ of respiration?
lungs
which lung is thicker, wider, and shorter?
right
which lung has 3 lobes?
right
why does left lung have only 2 lobes?
placement of heart
3 parts to lungs
Apex, mid-lung (right side only), and base (lower)
how many layers are the lungs covered with?
2
names of the layers that surround the lungs
visceral pleura & parietal pleura
what is the inner layer to the lungs called?
visceral pleura
what is the outer layer to the lungs called?
parietal pleura
what is between the two layers around the lungs?
Small amount of lubricating fluid
what is the space between the two layers named?
pleural space
why is their lubricant between the two layers?
glide over each other without friction
should you be able to see the pleural space on x-ray?
no
when can you see the pleural space?
when their is pleural effusion
pleural effusion
the pleural space fills with fluid, blood, pus
what causes pleural effusion?
- Gun shot wound, car accident, trauma
- Inflammation and infection
why would you insert a chest tube?
drain the fluid, blood or pus that has collected in the pleural space
what is an early sign of lung cancer?
Frequent pneumonia/fluid in pleural effusion
Functions of the Respiratory System
- Gas exchange
- Synthesis of surfactant and other chemicals
- Metabolism and detoxification of drugs and toxins
- Defense against infection
why do you want babies to be born at full term?
- Babies make surfactant closer to term
- May give mom supplemental surfactant so that it goes to baby to develop lungs
what respiratory function is important to pharmacology?
Metabolism and detoxification of drugs and toxins
how does the respiratory system defend against infection?
- Nose tries to get rid of things
- Cilia work against infections
External respiration
- Bringing in atmospheric air
- Most important, cant bring it in then you can’t exchange it
- Much of interventions happen here
- Help people breathe better
- Mechanical ventilation
mechanical ventilation
Intubate and ventilator
Internal respiration
Cellular level
Ventilation
movement of gases into and out of the lungs. Ventilation is affected by lung compliance, elastic recoil, and airway resistance
what limits ventilation?
disease, infection, and inflammation
how is ventilation studied?
utilizing spirometry, peak flow meters, pulmonary function testing
Perfusion
refers to the blood flow thru the vessels of a specific organ or body part
Diffusion
movement of gases across the capillary membrane from areas of higher concentration to areas of lower concentration
Involuntary ventilation
- During sleep, coughing
- Back up system
Factors that Influence Oxygenation
Triggers you to breathe Hematology system Lifespan and Development Environment Lifestyle Medications Pathophysiological Conditions
Factors that Influence Oxygenation - Triggers you to breathe
- CO2 levels builds up
- Triggers you to take a breath (bring in oxygen)
Factors that Influence Oxygenation - Hematology system
- Enough hemoglobin to allow oxygen to bind
- Anemic patients will sometime have respiratory issues
Factors that Influence Oxygenation - Lifespan and Development
- RDS (respiratory distress syndrome) - infant or adult
- ARDS - adult
- URI - upper respiratory infection
- Adolescent smoking
- How well you can oxygenate
Factors that Influence Oxygenation - Environment
Stress and allergies
Factors that Influence Oxygenation - Lifestyle
- Nutrition, exercise, substance abuse, etc.
- Nutrition - adequate diet of iron to make RBC
- Exercise - improves oxygen
Factors that Influence Oxygenation - Medications
- Can alter oxygen levels
- Help them breathe or make it worse
Factors that Influence Oxygenation - Pathophysiological Conditions
- Alterations in oxygen and carbon dioxide levels
- Alterations in pulmonary system
- Pulmonary circulation
- Neuromuscular abnormalities
- Cardiovascular abnormalities
- Oxygen transport problems
- Metabolic problems
Pathophysiological Conditions - Alterations in oxygen and carbon dioxide levels
- Asthma
- Chronic bronchitis
- COPD
- Emphysema
asthma
harder time getting appropriate oxygen in
Emphysema
no problem with bringing oxygen in but struggle with getting CO2 out
Pathophysiological Conditions - Alterations in pulmonary system
structure, airways, and tissue
Pathophysiological Conditions - Pulmonary circulation
hypertension
Pathophysiological Conditions - Neuromuscular abnormalities
MS, Lou Gehrig’s
Pathophysiological Conditions - Cardiovascular abnormalities
- heart disease/vessel disease
- Cardiac and respiratory go hand in hand
- If you have cardiac disease you are at risk for respiratory disease and vice versa
Pathophysiological Conditions - Metabolic problems
Endocrine disorder
how big is the heart?
Generally about the size of a fist and weighs less than one pound
how much blood does the heart pump in a lifetime?
80 million gallons
function of the circulatory system
- Provide oxygen, nutrients, and hormones to the cells.
- Remove CO2 and waste products from the cells.
- Distribute heat throughout the body to maintain body temperature
If temp is too high
vasodilation occurs
If temp is too low
vasoconstriction, conserve heat, protect inner core
Layers of the Heart
- Endocardium
- Myocardium
- Epicardium
Endocardium
- inner lining of the heart
- made of endothelial cells
- line the heart chambers and valves
Myocardium
- thickest part of the heart that consists of cardiac muscle
- does the work
- muscle layer
Epicardium
consists of a visceral layer and parietal layer
Cardiac tamponade
heart stops because it can’t pump, cardiac standstill, too much fluid between the two spaces, too much pressure
visceral epicardium
attaches to the myocardium and is the outer layer of the heart
parietal epicardium
forms the sac called the pericardium that surrounds the heart
how many chambers does the heart have?
4
what do the chambers do?
fill and empty of blood with each contraction and relaxation
Contraction
depolarization (no charge) of the cardiac muscle
relaxation
repolarization (get ready to take on new electrical charge) of the cardiac muscle
what are the upper chambers of the heart called?
atria
what are the lower chambers of the heart called?
ventricles
is the myocardium thicker on the left or right?
left
why does the left ventricle work the hardest?
needs to contract efficiently enough to get all of the blood into aorta which is a high pressure system
where does congestive heart failure occur?
left ventricle
where is the worst place to have a heart attack?
Posterior side of heart, don’t have a lot of vessels but 2nd worst is lt ventricle
how many valves does the heart have?
4