Week 1; Acute Care Cardiac Flashcards
BLOOD FLOW REVIEW (1)
The __ atrium receives deoxygenated blood from the body through the __ and __ __ __ and also receives blood from the heart muscle through the __ __.
right, superior, inferior, vena cava, coronary sinus
BLOOD FLOW REVIEW (2)
Most blood flows passively from the right atrium through the __ __ and to the __ __ during ventricular __
tricuspid valve, right atrium, diastole
BLOOD FLOW REVIEW (3)
The right atrium propels remaining venous return through the right ventricle during __ __
Atrial systole
BLOOD FLOW REVIEW (4)
The right ventricle is a __ __. It generates enough pressure to close the __ __, open the __ __, and propel blood into the __ __ and __.
Muscular pump, tricuspid valve, pulmonic valve, pulmonary artery, lungs
BLOOD FLOW REVIEW (5)
After oxygenated in the lungs, blood flows from the four pulmonary veins into the __ __. Then, through the __ __ into the __ __ during ventricular __.
Left atrium, mitral valve, left ventricle, diastole.
BLOOD FLOW REVIEW (5)
The left ventricle generates enough pressure to close the __ __ and open the __ __. Blood is then pumped into the __ and into __ __
mitral valve, aortic valve, aorta, systemic circulation.
Blood Flow Order
- superior vena cava
- right atrium
- tricuspid valve
- right ventricle
- pulmonic valve
- pulmonary artery to lungs
- lungs to pulmonic veins
- left atrium
- mitral valve
- left ventricle
- aortic valve
- aorta
Mean Arterial Pressure (MAP)
An average blood pressure in an individual during a single cardiac cycle. MAP is altered by cardiac output and systemic vascular resistance
MAP parameter
Must be at least 60 mm Hg to maintain adequate blood flow through coronary arteries and perfuse major organs (brain)
Systolic BP
The amount of pressure or force generated by the left ventricle to distribute blood into the aorta. It is a measure of how effectively the heart pumps and is an indicator of vascular tone
Diastolic BP
The amount of pressure against the arterial walls during the relaxation phase of the heart
Blood pressure regulation; autonomic nervous system:
Baroreceptors –
Chemoreceptors-
inhibition results in drop in BP
Hypercapnia, sensitive to hypoxemia; when stimulated, send impulses along the Vagus nerve to activate a vasoconstrictive response to increase BP
Blood pressure regulation; renal system
Kidneys
Help regulate cardiovascular activity. When renal blood flow decreases, pressure decreases and kidneys retain sodium and water. BP tends to rise because of fluid retention and activation to the renin-angiotensin-aldosterone mechanism
Blood pressure control; endocrine system
vasopressin from the pituitary gland that releases ADH
Blood pressure control; external factors
emotional factors also affect BP
Cardiovascular System Assessment
Patient history – examples: demographics, history of medical issues, smoking, drug use
Nutritional history
Family history and genetic risk
Current health problems
Pain, discomfort
Dyspnea, Dyspnea on exertion, orthopnea, paroxysmal nocturnal dyspnea
Fatigue
Palpitations
Edema
Syncope
Extremity pain
Cardiovascular system assessment; physical
General appearance – BMI/HT/WT
Skin
Cyanosis, rubor
Extremities
Clubbing, edema
Blood pressure
Hypotension and hypertension
Postural (orthostatic) hypotension
Precordium (area over heart) assessment
Inspection
Palpation
Percussion
Auscultation;
Normal heart sounds
Gallops and murmurs
Pericardial friction rub
Assessing chest discomfort
Quality and Severity
Location and Radiation
Duration and relieving factors helps distinguish but many times these mimic one another:
angina, MI, pericarditis, pleuropulmonary, esophageal-gastric, anxiety
Serum marker of myocardial damage: Troponin
Troponin T and troponin I – myocardial muscle protein released when injury, rise indicates necrosis or acute MI.
Serum marker of myocardial damage: creatine kinase (CK) –
exists in skeletal, heart muscle, brain and lungs Cardiac is specifically CK-MB, present within first 48 hours
Serum marker of myocardial damage: myoglobin –
general damage to skeletal or cardiac muscle (increased in numerous conditions including MI, Cardiac surgery, rhabdomyolysis, shock, chronic kidney disease, cocaine use)
Serum marker of myocardial damage: homocysteine –
risk factor for cardiovascular disease
Additional serum markers of myocardial damage:
High-sensitive C-reactive protein and serum lipids
Blood coagulation studies
PT/INR – prothrombin time and international normalized ratio
PTT – partial thromboplastin time
ABG –
arterial blood gas – tissue oxygenation, acid base status
Fluid and electrolyte balance – chem panel
Low serum K+- increased electrical instability, ventricle dysrhythmias, hypocalcemia can cause ventricular dysrhythmias, prolonged QT wave
Erythrocyte count (RBC) –
decreased in infective endocarditis, increased in heart diseases to compensate for decreased oxygen
H&H –
hemoglobin and hematocrit, decreased can lead to angina or aggravate heart failure
Leukocyte count(WBC) –
elevated in infection, and after MI
Diagnostic assessments
PA and lateral CXR
Angiography/Arteriography – by interventional radiology
Cardiac catheterization
ECG
Electrophysiologic study (EPS)
Stress test
Echocardiography
Pharmacologic stress echocardiogram (dobutamine or dipyridamole). These increase heart’s contractility and one coronary artery dilator.
Transesophageal Echocardiography – cardiac structure, transducer placed behind heart in the esophagus or stomach
Myocardial nuclear perfusion imaging (MNPI) - radioactive tracers for nuclear imaging
CT
MRI
Cardiac catheterization can measure
intracardiac pressures, take samples, detect valve problems, regurgitation.
Dysrythmias
Abnormal rhythms of the heart’s electrical system that can affect its ability to effectively pump oxygenated blood throughout the body. Some are life threatening. Result of disturbances in cardiac electrical impulse formation, conduction, or both.
Automaticity –
pacing function
Excitability –
ability to respond to impulses
Conductivity –
ability to send electrical stimulus from cell membrane to cell membrane
Contractility –
ability of atrial and ventricular muscle cells to shorten their fiber length in response to stimulation (mechanical activity of the heart)
Normal sinus rhythm
Rate: 60 to 100 beats/min
Rhythm: Regular
P waves: Present, consistent configuration, one P wave before each QRS complex
PR interval: 0.12 to 0.20 second and constant
QRS duration: 0.04 to 0.10 second and constant
Sinus arrhythmia
Variant of NSR; results from changes in intrathoracic pressure during breathing
Common dysrhythmias include
Premature complexes
Bradydysrhythmias
Tachydysrhythmias
Sinus dysrhythmias include
Sinus tachycardia
Sinus bradycardia
ID this rhythm
Sinus tachycardia
ID this rhythm
Bradycardia
ID this rhythm
Premature atrial contractions
ID this rhythm
Atrial flutter
ID this rhythm
Atrial fibrillation
ID this rhythm
Premature ventricular contractions
ID this rhythm
Ventricular tachycardia
ID this rhythm
Ventricular fibrillation