Term
|
Definition
| Record (x-ray) of a blood vessel. |
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Term
|
Definition
| Surgical repair of a blood vessel. |
|
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Term
|
Definition
|
|
Term
|
Definition
|
|
Term
|
Definition
| Surgical connection between arteries |
|
|
Term
|
Definition
| Process of recording (x-ray) arteries after injecting contrast material. |
|
|
Term
|
Definition
| Removal of the inner lining of the artery (when it is filled with plaque). |
|
|
Term
|
Definition
| Collection of fatty material in an artery |
|
|
Term
|
Definition
| Hardening of arteries with deposit of fatty substance. |
|
|
Term
|
Definition
| Removal of a fatty mass in a vessel. |
|
|
Term
|
Definition
| Pertaining to an upper chamber of the heart. |
|
|
Term
|
Definition
| Pertaining to an atrium and ventricle (upper and lower chambers of the heart). |
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Term
|
Definition
| Artery that branches from the aorta to bring blood to the arm |
|
|
Term
|
Definition
| Enlargement of the heart. |
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|
Term
|
Definition
|
|
Term
|
Definition
| Condition of slow heartbeat. |
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Term
|
Definition
| Condition of fast heartbeat. |
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Term
|
Definition
| Condition of excessive cholesterol in the blood |
|
|
Term
|
Definition
| Arteries branch from the aorta to bring oxygen-rich blood to the heart muscle |
|
|
Term
|
Definition
| abnormal condition of bluish discoloration due to poor oxygenation of blood |
|
|
Term
|
Definition
| Benign tumor of the heart (myx/o = mucus). The tumor is embedded in soft mucoid stromal tissue. |
|
|
Term
|
Definition
| Condition of decreased oxygen in inspired air; as occurs in high altitudes |
|
|
Term
|
Definition
| Surgical puncture of the membrane surrounding the heart (to remove fluid) |
|
|
Term
|
Definition
|
|
Term
|
Definition
| Inflammation of a vein with clots |
|
|
Term
|
Definition
| Arrhythmia and dysrhythmia are used to describe abnormal heart rhythm |
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|
Term
|
Definition
| Instrument to measure blood pressure |
|
|
Term
|
Definition
| Instrument to examine the chest. |
|
|
Term
|
Definition
|
|
Term
|
Definition
| Surgical repair of a valve (within the heart). |
|
|
Term
|
Definition
| Inflammation of the mitral valve |
|
|
Term
|
Definition
|
|
Term
|
Definition
|
|
Term
|
Definition
|
|
Term
|
Definition
| Pertaining to blood vessels |
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|
Term
|
Definition
|
|
Term
|
Definition
| Incision of a vein for phlebotomy or to start an intravenous infusion. |
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Term
|
Definition
| The wall separating the ventricles of the heart (lower chambers). |
|
|
Term
|
Definition
| X-ray record of a blood vessel |
|
|
Term
|
Definition
| Surgical repair of a blood vessel. |
|
|
Term
|
Definition
| Lack of oxygen in body tissues |
|
|
Term
|
Definition
| Largest artery in the body |
|
|
Term
|
Definition
|
|
Term
|
Definition
| Without rhythm; an irregular beat of the heart |
|
|
Term
|
Definition
| Surgical connection between two arteries |
|
|
Term
|
Definition
| X-ray recording of arteries; contrast is injected. |
|
|
Term
|
Definition
|
|
Term
|
Definition
| Hardening of an artery with collection of fatty plaque. |
|
|
Term
|
Definition
| Largest type of blood vessel |
|
|
Term
|
Definition
| Removal of plaque (lipids and clots) that accumulate in the lining of an artery. |
|
|
Term
|
Definition
| Mass of fatty plaque that collects in an artery. |
|
|
Term
|
Definition
| Form of arteriosclerosis in which fatty plaque deposits in the interior lining of an artery |
|
|
Term
|
Definition
| Pertaining to an atrium (upper chamber of the heart). |
|
|
Term
|
Definition
| Specialized muscle fibers connecting the atria with the ventricles and transmitting impulses between them; bundle of His. |
|
|
Term
|
Definition
| Specialized tissue in the wall between the atria. Electrical impulses pass from the sino-atrial node (pacemaker) through the atrioventricular node and atrioventricular bundle (bundle of His) toward the ventricles. |
|
|
Term
|
Definition
| Upper chamber of the heart |
|
|
Term
|
Definition
| Artery that carries blood to the arm |
|
|
Term
|
Definition
|
|
Term
|
Definition
|
|
Term
|
Definition
|
|
Term
|
Definition
| Gas released by body cells and carried by veins to the heart, and then to the lungs for exhalation; CO2. |
|
|
Term
|
Definition
| Shock that results from failure of the heart in its pumping action. |
|
|
Term
|
Definition
|
|
Term
|
Definition
|
|
Term
|
Definition
| Branches of the aorta bringing oxygen-rich blood to the heart muscle. |
|
|
Term
|
Definition
| Abnormal condition of blueness of the skin; caused by decreased oxygen and increased carbon dioxide in the blood. |
|
|
Term
|
Definition
| Blood that is oxygen-poor |
|
|
Term
|
Definition
| Relaxation phase of the heartbeat |
|
|
Term
|
Definition
| Record of the electricity flowing through the heart |
|
|
Term
|
Definition
| Inner lining of the heart |
|
|
Term
|
Definition
| Innermost lining of blood vessels. |
|
|
Term
|
Definition
| High levels of cholesterol in the blood |
|
|
Term
|
Definition
| Hypoxia is deficiency of oxygen in body tissues. |
|
|
Term
|
Definition
| Wall between the ventricles of the heart. |
|
|
Term
|
Definition
| Valve between the left atrium and left ventricle; bicuspid valve. |
|
|
Term
|
Definition
| Inflammation of the mitral valve |
|
|
Term
|
Definition
| Muscular layer of the heart |
|
|
Term
|
Definition
| Rare neoplasm of connective tissue found in the heart muscle. |
|
|
Term
|
Definition
| Heart rhythm originating in the sinoatrial node |
|
|
Term
|
Definition
| A gas that enters the body through the lungs and travels to the heart to be distributed by arterial blood to all parts of the body. |
|
|
Term
|
Definition
| Specialized nervous tissue in the wall of the right atrium; it begins the heartbeat; sinoatrial node. |
|
|
Term
|
Definition
| Surgical puncture to remove fluid within the pericardial space surrounding the heart |
|
|
Term
|
Definition
| Double-layered membrane surrounding the heart |
|
|
Term
|
Definition
|
|
Term
|
Definition
| Blood vessel carrying oxygen-poor blood from the right ventricle of the heart to the lungs |
|
|
Term
|
Definition
| Flow of blood from the heart to the lungs and then back to the heart. |
|
|
Term
|
Definition
| A valve located between the right ventricle and the pulmonary artery. |
|
|
Term
|
Definition
| One of two pairs of vessels carrying oxygenated blood from the lungs to the left atrium of the heart. |
|
|
Term
|
Definition
| Beat of the heart as felt through the walls of the arteries |
|
|
Term
| Septum (singular), septa (plural) |
|
Definition
| Wall or partition. The interatrial septum lies between the atria of the heart and the interventricular septum is between the ventricles of the heart. |
|
|
Term
|
Definition
| Sensitive nervous tissue in the wall of the right atrium; pacemaker of the heart. |
|
|
Term
|
Definition
| Instrument to measure blood pressure |
|
|
Term
|
Definition
| Instrument for listening to sounds in the chest |
|
|
Term
|
Definition
| Flow of blood from body tissues to the heart and from the heart back to the tissues |
|
|
Term
|
Definition
| Contraction phase of the heartbeat |
|
|
Term
|
Definition
|
|
Term
|
Definition
|
|
Term
|
Definition
| Inflammation of a vein and formation of a clot within the vein. |
|
|
Term
|
Definition
| A valve located between the right atrium and right ventricle. |
|
|
Term
|
Definition
| Structure in a vein or in the heart that temporarily closes an opening so that blood flows in the proper direction |
|
|
Term
|
Definition
|
|
Term
|
Definition
| Surgical repair of a valve |
|
|
Term
|
Definition
| Pertaining to a blood vessel |
|
|
Term
|
Definition
| Narrowing of a blood vessel |
|
|
Term
|
Definition
| Widening of a blood vessel; vasodilatation. |
|
|
Term
|
Definition
| Thin-walled blood vessel that carries oxygen-poor (deoxygenated) blood from body tissues back to the heart. |
|
|
Term
|
Definition
| Largest vein in the body. The venae cavae (inferior and superior) return blood to the heart from the body tissues. |
|
|
Term
|
Definition
| Incision of a vein to remove blood |
|
|
Term
|
Definition
|
|
Term
|
Definition
| One of two lower chambers of the heart |
|
|
Term
|
Definition
|
|
Term
|
Definition
| Drug that causes dilation of blood vessels and lowers blood pressure, prevents heart attacks, strokes, and congestive heart failure. ACE stands for angiotensin-converting enzyme, which normally constricts blood vessels |
|
|
Term
|
Definition
| Consequences of plaque rupture in coronary arteries; unstable angina and myocardial infarction (heart attack). |
|
|
Term
|
Definition
| Local widening or ballooning out of a small area of an artery. |
|
|
Term
|
Definition
| Chest pain associated with myocardial ischemia. |
|
|
Term
|
Definition
| X-ray imaging of blood vessels after injection of contrast material. |
|
|
Term
|
Definition
| Failure of conduction of impulses from the AV node to the atrioventricular bundle and ventricles of the heart. |
|
|
Term
|
Definition
| Electrical impulses move randomly throughout the atria, causing the atria to quiver instead of contracting with a normal rhythm |
|
|
Term
|
Definition
| Use of a stethoscope to listen for sounds emanating from the heart or other organs |
|
|
Term
|
Definition
| Drug used to treat high blood pressure and control heart rate. |
|
|
Term
|
Definition
| An abnormal blowing or swishing sound heard on auscultation of an artery or an organ. |
|
|
Term
|
Definition
| Drug used to treat chest pain (angina) and high blood pressure (hypertension). |
|
|
Term
|
Definition
| Sudden, unexpected stoppage of the heart; sudden cardiac death |
|
|
Term
|
Definition
| Chemicals that are measured in the blood as evidence of a heart attack. Examples are creatine kinase (CK), troponin-I (cTnI), and troponin T (cTnT). |
|
|
Term
|
Definition
| Thin, flexible tube is guided into the heart via a vein or an artery and after contrast material is introduced, blood pressure is measured, and x-rays taken to image patterns of blood flow. |
|
|
Term
|
Definition
| Images of the heart are produced with magnetic waves. |
|
|
Term
|
Definition
| Pressure on the heart caused by fluid in the pericardial space. |
|
|
Term
|
Definition
| Treatment for serious arrhythmias using brief discharges of electricity to shock the heart so that a normal rhythm can begin; defibrillation |
|
|
Term
|
Definition
| Brief delivery of radiofrequency or cryoenergy to destroy areas of heart tissue that may be causing arrhythmias. |
|
|
Term
|
Definition
| Pain, tension, and weakness in a leg after walking has begun, but absence of pain at rest |
|
|
Term
|
Definition
| Congenital anomaly in which a portion of the aorta near the heart is narrowed or stenosed. |
|
|
Term
| Computerized tomography angiography |
|
Definition
| X-ray images are combined with computerized tomography to produce a three-dimensional picture of the heart and blood vessels. |
|
|
Term
|
Definition
| Structural heart defects that appear at birth |
|
|
Term
|
Definition
| Heart is unable to pump its required amount of blood. |
|
|
Term
|
Definition
| Arteries that supply blood to the heart muscle become clogged and blocked with deposits of fatty material and cholesterol (plaque). |
|
|
Term
| Coronary artery bypass grafting |
|
Definition
| Arteries or veins are grafted onto coronary arteries to bypass blocked arteries and bring need blood supply to the myocardium. |
|
|
Term
|
Definition
| Blood clots form in a large vein, usually in the leg |
|
|
Term
|
Definition
| Brief discharges of electricity are applied across the chest to stop dysrhythmias. |
|
|
Term
|
Definition
| Drug that increases the strength and regularity of the heartbeat |
|
|
Term
| Digital subtraction angiography |
|
Definition
| Video equipment, computer and x-ray machine produce images of blood vessels before and after injecting contrast material. |
|
|
Term
|
Definition
| Method of focusing sound waves on blood vessels to measure blood flow. |
|
|
Term
|
Definition
| High-energy sound waves are transmitted into the chest and images recorded of valves, chambers, surfaces and movement of the heart. |
|
|
Term
|
Definition
| Process of recording the electricity flowing through the heart. |
|
|
Term
| Electron beam computed tomography |
|
Definition
| Electron beams and CT identify calcium deposits in and around coronary arteries to diagnose early coronary artery disease |
|
|
Term
|
Definition
| A clot or other substance that travels to a distant location and suddenly blocks a blood vessel. |
|
|
Term
|
Definition
| Surgical removal of plaque from the inner layer of an artery. |
|
|
Term
|
Definition
| Inflammation of the endocardium (inner lining of the heart). |
|
|
Term
| Extracorporeal circulation |
|
Definition
| Use of a heart-lung machine to divert blood from the heart and lungs during open heart surgery |
|
|
Term
|
Definition
| Random, rapid, inefficient, irregular contractions of the atria or ventricles. |
|
|
Term
|
Definition
| Rapid, but regular contractions of the heart, usually of the atria |
|
|
Term
|
Definition
| Donor heart is transferred to a recipient |
|
|
Term
|
Definition
| Swollen, twisted veins in the rectal and anal region |
|
|
Term
|
Definition
| Compact version of an electrocardiograph is worn during a 24-hour period to detect cardiac arrhythmias |
|
|
Term
|
Definition
|
|
Term
| Implantable cardioverter-defibrillator |
|
Definition
| Small electric device implanted inside the chest (near the collarbone) to sense arrhythmias and terminate them to restore normal sinus rhythm. |
|
|
Term
|
Definition
|
|
Term
|
Definition
| Holding back blood to an region of the body. Myocardial ischemia is deprivation of blood to the heart muscle |
|
|
Term
| Left ventricular assist device |
|
Definition
| Booster pump implanted in the abdomen with a tube inserted into the left ventricle. An LVAD is a “bridge to transplant” or destination therapy when heart transplantation is impossible |
|
|
Term
|
Definition
| Measurement of cholesterol and triglycerides (fats) in a sample of blood. |
|
|
Term
| Lipoprotein electrophoresis |
|
Definition
| Lipoproteins (combinations of fat and protein) are physically separated in a blood sample. Examples of lipoproteins are HDL (high density lipoprotein) and LDL (low density lipoprotein). |
|
|
Term
|
Definition
| Narrowing of the mitral valve |
|
|
Term
|
Definition
| Abnormal closure of the mitral valve so that blood refluxes backward into the left atrium during ventricular contraction |
|
|
Term
|
Definition
| Extra sound heard between normal beats during auscultation of the heart. |
|
|
Term
|
Definition
| Area of dead (necrotic) tissue in the heart muscle; heart attack. |
|
|
Term
|
Definition
| Drug used in the treatment of angina (pectoris). It dilates coronary arteries so that more blood flows to heart muscle. |
|
|
Term
|
Definition
| Blockage or closure of a vessel or tube. |
|
|
Term
|
Definition
| Uncomfortable sensations in the chest related to cardiac arrhythmias, such as skipped beats |
|
|
Term
|
Definition
| The ductus arteriosus, a small duct that is open during fetal circulation, fails to close at birth |
|
|
Term
| Percutaneous coronary intervention |
|
Definition
| A catheter with a balloon and stent is inserted into a coronary artery to remove collections of plaque. Drug-eluting stents release chemicals to keep debris and plaque from recollecting. |
|
|
Term
|
Definition
| Scraping or grating sound heard on auscultation of the heart. It is usually symptomatic of pericarditis |
|
|
Term
|
Definition
| Inflammation of the pericardium (double-layered outermost membrane of the heart). |
|
|
Term
| Peripheral arterial disease |
|
Definition
| Blockage of arteries carrying blood to the legs, arms, kidneys, and other organs.. |
|
|
Term
|
Definition
| Small pinpoint hemorrhages under the skin. |
|
|
Term
| Positron emission tomography (PET) scan |
|
Definition
| Images show blood flow and myocardial function following uptake of radioactive substances |
|
|
Term
|
Definition
| Recurrent episodes of pallor and cyanosis in fingers and toes caused by blood vessel spasms. |
|
|
Term
|
Definition
| Heart disease caused by rheumatic fever |
|
|
Term
|
Definition
| Small holes, present at birth, in the walls between the heart chambers. |
|
|
Term
|
Definition
| Drugs given to lower cholesterol in the bloodstream. |
|
|
Term
|
Definition
| Exercise tolerance test (ETT) is used to determine the heart’s response to physical exertion |
|
|
Term
|
Definition
| Continuous monitoring of a patient’s heart rhythm in a hospital. |
|
|
Term
|
Definition
| Four separate defects of the heart occurring at birth |
|
|
Term
| Technetium 99m sestamibi scan |
|
Definition
| Uptake of a radioactive chemical (technetium 99m sestamibi) in myocardium reveals evidence of a heart attack (myocardial infarction). |
|
|
Term
|
Definition
| Concentration of a radioactive substance (thallium 201) is measured in the myocardium to show evidence of an infarction (“cold spots”). |
|
|
Term
|
Definition
| Fine vibration felt on palpation (touching) the body over a blood vessel that is blocked. |
|
|
Term
|
Definition
| Injection of drugs (streptokinase and tPA) to dissolve clots in the bloodstream. |
|
|
Term
|
Definition
| Blockage of a blood vessel caused by thrombosis or clot formation. |
|
|
Term
|
Definition
| Swollen, twisted veins, often occurring in the legs |
|
|
Term
|
Definition
| Collections of clotted material that accumulate on endocardium and valves of the heart in conditions such as endocarditis and rheumatic heart disease. |
|
|
Term
|
Definition
|
|
Term
|
Definition
|
|
Term
|
Definition
|
|
Term
|
Definition
|
|
Term
|
Definition
| yellowish plaque, fatty substance |
|
|
Term
|
Definition
| atrium, upper chamber of heart |
|
|
Term
|
Definition
|
|
Term
|
Definition
|
|
Term
|
Definition
|
|
Term
|
Definition
|
|
Term
|
Definition
|
|
Term
|
Definition
|
|
Term
|
Definition
|
|
Term
|
Definition
|
|
Term
|
Definition
|
|
Term
|
Definition
|
|
Term
|
Definition
|
|
Term
|
Definition
|
|
Term
|
Definition
|
|
Term
|
Definition
|
|
Term
|
Definition
|
|
Term
|
Definition
|
|
Term
|
Definition
|
|
Term
|
Definition
| ventricle, lower chamber of heart |
|
|
Term
|
Definition
|
|
Term
| bradycardia and heart block |
|
Definition
| failure of proper conduction of impulses from the SA node through the AV node to the atrioventricular bundle (bundle of His) |
|
|
Term
|
Definition
| rapid but regular contractions, usually of the atria |
|
|
Term
|
Definition
| very rapid, random, inefficient and irregular contractions of the heart (350 beats or more per minute) |
|
|
Term
|
Definition
| abnormalities in the heart at birth |
|
|
Term
| Coarctation of the aorta (CoA) |
|
Definition
|
|
Term
|
Definition
| passageway between the aorta and the pulmonary artery remains open after birth |
|
|
Term
|
Definition
| small holes in the wall between the atria or the ventricles |
|
|
Term
|
Definition
| congenital malformation involving four distinct heart defects |
|
|
Term
| congestive heart failure (CHF) |
|
Definition
| heart is unable to pump its required amount of blood |
|
|
Term
| coronary artery disease (CAD) |
|
Definition
| disease of the arteries surrounding the heart |
|
|
Term
|
Definition
| inflammation of the inner lining of the heart |
|
|
Term
| hypertensive heart disease |
|
Definition
| high blood pressure affecting the heart |
|
|
Term
| mitral valve prolapse (MVP) |
|
Definition
| improper closure of the mitral valve |
|
|
Term
|
Definition
| heart disease caused by rheumatic fever |
|
|
Term
| deep vein thrombosis (DVT) |
|
Definition
| blood clot (thrombus) forms in a large vein, ususally in a lower limb |
|
|
Term
|
Definition
|
|
Term
|
Definition
| recurrent episodes of pallor and cyanosis primarily in fingers and toes |
|
|
Term
| angiotensin-converting enzyme (ACE) inhibitor |
|
Definition
| antihypertensive drug that blocks conversion of angiotension I to angiotension II, causing blood vessels to dilate. |
|
|
Term
|
Definition
| device enabling ventricles to beat together so more blood is pumped out of heart |
|
|
Term
|
Definition
| drug used to treat angina and hypertension |
|
|
Term
|
Definition
| drugs used in treatment of angina |
|
|
Term
|
Definition
|
|
Term
|
Definition
| Measurement of BNP (brain natriuretic peptide) in blood |
|
|
Term
| 3 major types of blood vessels in body? |
|
Definition
| arteries, veins, and capillaries |
|
|
Term
|
Definition
| arteries--lead blood away from the heart. The arteries have to be strong to withstand the pressure of the pumping action of the heart. Their walls are elastic and allow them to expand. Arteries turn into smaller arteries called arterioles that carry the blood to the capillaries. Arteries are made up of connective tissue and epithelial cells. |
|
|
Term
|
Definition
| carry blood between arteries and veins. Their walls are only one epithelial cell thick. The thin walls allow for the passage of oxygen and nutrients out of the bloodstream and into the tissue fluid surrounding the cells. |
|
|
Term
|
Definition
| take blood towards the heart and away from the tissues. Veins carry waste-filled blood. The blood pressure is lower in the veins than in the arteries. The veins have little valves in order to keep the blood moving toward the heart. |
|
|
Term
| what is systemic circulation? |
|
Definition
| Systemic circulation is the circulation from the cells to the heart and back to the cells (leaving out the lungs). |
|
|
Term
| what is pulmonary circulation? |
|
Definition
| Pulmonary circulation is the circulation from the heart to the lungs and back to the heart. |
|
|
Term
| what is the path of blood thru heart? |
|
Definition
| Blood enters the right atrium by way of the superior and inferior venae cavae. From the right atrium, the blood passes through the tricuspid valve into the right ventricle. The blood travels through the pulmonary valve (or semilunar valve) through the pulmonary artery to the lungs. Exchange of oxygen and carbon dioxide takes place. The blood leaves the lungs and enters the left side of the heart by way of the pulmonary vein. The blood goes through the left atrium, mitral valve, left ventricle, aortic valve, and leaves the heart through the aorta (largest artery in the body). |
|
|
Term
| what is separating the 4 chambers of the heart? |
|
Definition
| The four chambers of the heart are separated by the muscular partitions called septa. (singular - septum). The interatrial septum separates the two atria and the interventricular septum is between the two ventricles. |
|
|
Term
| what are the three layers of the heart? |
|
Definition
| The three layers of the heart are the endocardium (smooth and lines the heart), the myocardium (thick muscular layer) and the pericardium (outermost layer). The pericardium has two layers, the visceral pericardium and parietal pericardium (also called the epicardium). The pericardium holds the heart in place. |
|
|
Term
|
Definition
| relaxation phase of the heart. The right and left atrium fill up with blood. At the end of diastole, both atria contract and send blood into the ventricles. |
|
|
Term
|
Definition
| contraction phase of the heart. Ventricles are pumping out. The right ventricle is going to the pulmonary artery to the lung. The left ventricle is going to the body. |
|
|
Term
|
Definition
| In the right atrium in the back is specialized muscle tissue. This is where the electrical impulse originates. This is called the sinoatrial node (pacemaker of the heart). This causes the walls of the atria to contract and the blood is pushed into the ventricles (end of diastole). |
|
|
Term
| how can you detect if the heart is beating properly? |
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Definition
| The waves of electricity pass from the sinoatrial node to the atrioventricular node. This is found in the interatrial septum. The atrioventricular node carries the wave to a place deep in the ventricle wall called the bundle of His. The wave goes to all parts of the ventricles and causes them to contract (systole). An electrocardiogram detects the electrical changes in the heart muscle. |
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| instrument to measure blood pressure. Taken on the main artery (brachial) of the arm. |
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| what is the job of the two coronary arteries? |
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| Coronary arteries are two large vessels arising from the aorta. The heart feeds itself before any other organ. |
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| deposits of fatty compounds that causes the lining of the arteries to be rough and inflexible. When blood flow is entirely stopped, it leads to an infarction. When the tissue dies because of lack of blood, it becomes ischemic. |
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| Transaminase is an enzyme that is released from the myocardium during a heart attack. The levels rise 20 times normal in the bloodstream within 24 hours of a heart attack. |
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| rapid, regular heartbeat. |
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| blood-filled pouches that burst from weak spots in the artery wall. |
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| defective artery in the brain bursts, flooding surrounding tissue with blood. |
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| a wandering clot is carried in bloodstream until it gets stuck in an artery leading to the brain. |
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