Thursday, March 30, 2006
In the human body, the heart is normally situated slightly to the left of the middle of the thorax, underneath the sternum (breastbone). It is enclosed by a sac known as the pericardium and is surrounded by the lungs. The apex is the blunt point at thbase of the heart. A stethoscope can be placed directly over the apex and count the beats. In normal adults, its mass is 250-350 g, but extremely diseased hearts can be up to 1000 g in mass. It consists of four chambers, the two upper atria (singular: atrium) and the two lower ventricles.
A septum divides the right atrium and ventricle from the left atrium and ventricle, preventing blood from passing bated unidirectional flow o blood from the atria to the ventricles.The ventricular systole consists of the contraction of the ventricles and flow of blood into the circulatory system. Again, once all the blood empties from the ventricles, the pulmonary and aortic semilunar vales close. Finally complete cardiadiastole involves relaxation of the atria and ventricles in preparation for refilling with cculating blood.Heart action and respiratory effort are absolute requirements in transpoay sustain damage after four minutes and irreversible damage after about seven minutes. The heart also rapidly loses the ability to maintain a normal rhythm. Following cardiac arrest, effective CPR enables enough oxygen to reach the brain to delay brain death, and allows the heart to remain responsive to defibrillation attempts.
CPR is commonly taught to the general public as these may be the only ones present in the crucial few minutes before emergency personnel are available. If administered properly it can save lives but when done badly or inappropriately it can interfere with life saving operations later. Sometimes CPR should not be attempted, particularly if other persons are injured and need immediate help. CPR takes a lot of effort and may keep care providers from helping others. See triage.
CPR is almost never effective if started more than 15 minutes after collapse because permanentbrain damage has probably already occurred. A notable exception is cardiac arrest occurring with exposure to very cold temperatures. A patient cannot be pronounced dead before he has been brought back to a normal temperature by appropriate means: Hypothermia seems to protect the victim by slowing down metabolic and physiologic processes, greatly decreasing the oxygen needed by tissues. There are cases where CPR, defibrillation, and advanced warming techniques have revived hypothermia victims after over 30 minutes or longer.
In respiratory arrest, when the victim still has a heartbeat (such as in drowning, choking, or drug overdose with opioids or sedatives) Rescue breathing (rather than CPR) should be used.
The function of the right side of the heart (see right heart) is to collect deoxygenated blood from the body and pump it into the lungs so that carbon dioxide can be dropped ofand oxygen picked up. this happens through a process d from the body enters the right atrium through two great vein, the superior vena cava wchdrains the pper part of the body and the inferior vena cava that drains the lor par. taks plces and the blood releases carn dioxide into the lung cavity and picks up oxygn. The oxygeated blood then flows through pulmonary veins to the left atrium. From the left atrium this newly oxygenatelood passes through the mitral valve to enter the left ventric to pump blood around the entre body, which involves exerting a considerable force to overcome the vasculposed of a lium made up of cardiac muscle. The endocardium is a further layer of flattened epithelial cells and connective tissue which lines the chambers of the heart.
take pains to discredit the contemporary chronicler Stefano Infessura's story of Innocent VIII's deathbed. In1492, as the Pope sank into a coma, te harrowing story was told that, at the uggestion of a physician, the blod of three boys was ifused into the dying pontiff's veins. They were ten years old, and had been promised a ducat each. All three died. Historians of medicine note this event as thefirst reported historical attempt at a blood transfusion. syringe for drect interhuman blood transfusionWith Harvey's discovery of he circulation h successful experiments , and Denys was accused of murderion was performed on March 27, 19ion institute was set up by Alexander Bogdanov (whowour nee or other. These otitis B and hepatitis C and others)can be passed from the donor t reciient. Tis has led to strict human blood transfusion standards ndeveloped countries, uch as Standards include screening for potential risk factors and health problems including determining donor hemoglobin level, and answering a set of standard oral and written questions, as well as testing donated units for these infections. The lack of such standards in placs like rural China, where desperate villagers donated plasma for money and had others' red blood cells reinjected, has produced entire villages infected with AIDS.
cardiac enzymes are proteins from cardiac tissue found in the blood. Until the 1980s, the enzymes SGOT and LH were used to assetine phospokinase (CPK) was very specific for myocardial injury. Current guidelines are generally in favor ofore permanent injury develops. A positive troponin in the setting of chest po be posenzyme elevations alone are considered reliable measures of cardiac injury,screen patients for furthe enzyme andECG testateally the femoral artery), obstructed or narrowed vesels cn be identifiecommonly peformed by cardioloists. Theres a very small risk of plaque and vessel rupture on ballon inflation; should this occur, then emergency open-chest cardiac surgey may be required. Patienematoma. Dissection (tearing) of the blood vessel is rare but usually managed with a local thrombotic injection.
An open-ended fund is equs a limited number of shares (or units) in an initial public offering (or IPO). The sarket subject to market forces. If demand for the shares are high they may trade at a premium to net asset value. If demand is low they meme if demand is high although this mactiveageributory factor in the collapse of the split capital investment trust debacle in the UK in 2entroker o commission (load) direct to the public called direct shares. Still a third class might have a high minimuents by many individuals, a retirement plan (such as a 401(k) plan) maer organizations, or PPOs. So which health plan is best? How do you choose what type of health insurance best suits the health care needs of you and your family?
Both HMOs and PPOs contain costs by contracting with health providers for reduced rate on health care services for its' members, often as much as 60%. One important difference between HMOs and PPOs is that PPOs often will cover the costs of care when the provider is out of their network, but usually at n assistant, or nurse practitioner). usually a family practitioner or internal medicine doctor for adult members or a pediatrician or family care practitioner for childern. The primary care provider is responsible for coordianting health delivery for plan members. Care by specialist physicians rea request to the health insurance plan review department, along with medical records that justify the service. The request is reviewed by the health insurance company to determine whether the services are justified as "medically necessary" according to the health plan policy and guidelines. Review is usually performed by licensed nurses, and, if the reviewer agrees that the service is necessary, approval is given and the service will be covered by the health insurance plan.
One of the main advantages rts in equities, real estate and fixed interest securities. If any one of the three is failing, because each is non-correlated (i.e. behaves independently) then by logical extension at least one of the otk making dealing costs an insignificant part of the investment.When a person insures the contents of their home they do so because of events that might happen; fire, theft, flood etc. Insurance is a way of spending a little money to protect against the risk of having to spend a lot of money. The point is, when a person insures their home contents they do so toprovide protection agains somthing that might happen. They hope their home will never be burgled policy. Examples nclude Term Assuranceand Whole of Life Assurance. An accidental death policy is not assured t pay on death as the life insured may not die through an accident, therefore it is an insurance policy.A policy might also be assured for other reasons. For example an endowment policy is designed to provide a lump sum on maturity. Under certain types of policy the lump sum is guaranteed. Therefore, this may also be called an assurance policy.



