By W. Connor. College of Eastern Utah. 2018.
Renin on diet 100 mg suhagra overnight delivery, exercise order suhagra 100 mg without prescription, and weight loss order 100 mg suhagra with mastercard, if necessary discount suhagra 100 mg with amex. Drug ther- raises blood pressure by causing blood vessels to constrict and by promoting the kidney’s retention of salt and Table 15•1 Blood Pressure water generic 100mg suhagra amex. BLOOD PRESSURE CLASSIFICATION (ADULTS)* It is important to treat even mild hypertension because this condition CATEGORY SYSTOLIC (mmHg) DIASTOLIC (mmHg) can eventually: Optimal 120 80 ◗ Weaken vessels and lead to saclike Normal 130 85 bulges (aneurysms) in vessel walls High normal 130–139 85–89 Hypertension that are likely to rupture. In the Stage 1 (mild) 140–159 90–99 brain, vessel rupture is one cause of Stage 2 (moderate) 160–179 100–109 stroke. Rupture of a vessel in the eye Stage 3 (severe) 180 110 may lead to blindness. Drugs used to treat hypertension include the following: ◗ Diuretics, which promote water loss ◗ Drugs that limit production of renin ◗ Drugs that relax blood vessels Checkpoint 15-19 What is meant by hypertension and hy- potension? Lumen Fatty deposit ◗ Arterial Degeneration and Other Lumen Blood Vessels Disorders As a result of age or other degenerative changes, materials may be deposited within the arterial walls. These deposits cause an irregular thickening of the wall at the expense of the lumen (space inside the vessel), as well as a loss of elas- ticity. In some cases, calcium salts and scar tissue may Arterial plaque cause this hardening of the arteries, technically called ar- teriosclerosis (ar-te-re-o-skle-RO-sis). The most common Figure 15-15 Stages in atherosclerosis. The nature rate the muscle and elastic connective tissue. Sometimes, of these disturbances varies with the parts of the body af- the arterial lining is also damaged, leading to possible fected and with the extent of the arterial changes. The thrombus may par- examples are as follows: tially or completely obstruct the vessel, as it sometimes 15 does in coronary thrombosis. Box 15-3 provides informa- ◗ Leg cramps, pain, and sudden lameness while walking tion on how to prevent atherosclerosis. Cigarette smok- ◗ Headaches, dizziness, and mental disorders may be the ing also increases the extent and severity of this disorder. Arterial damage may be present for years without causing ◗ Hypertension may result from a decrease in lumen size any noticeable symptoms. As the thickening of the wall within many arteries throughout the body. Although continues and the lumen’s diameter decreases, limiting hypertension may be present in young people with no Box 15-3 • Health Maintenance Preventing Atherosclerosis: Keeping Your Arteries CleanPreventing Atherosclerosis: Keeping Your Arteries Clean therosclerosis and its complications (heart disease, stroke, ◗ Maintain a healthy weight and get plenty of exercise Aand thrombosis) account for forty percent of all deaths in ◗ Limit intake of saturated fats, found mainly in foods from the United States! Atherosclerosis begins with microscopic animal sources damage to the endothelium of the arteries caused by direct ◗ Eat adequate amounts of soluble fibers, such as oat bran and contact with LDL (the “bad” cholesterol), oxidizing chemicals, fruit fibers, which have been shown to decrease cholesterol such as free-radicals, and some proteins. Lipids begin to accu- levels in the blood mulate in the arterial wall, followed by aggregation of platelets ◗ Take in adequate amounts of vitamin E, vitamin C, folic and macrophages, and the formation of plaque. The arterial acid, and calcium; each has been shown to have beneficial wall soon bulges into the lumen and obstructs blood flow. Ar- effects on the heart teries in the heart, brain, kidneys, and the extremities seem to ◗ Consider adding vitamins B6 and B12 to your diet; both are be especially vulnerable to this process. To help slow this de- ◗ Find ways to reduce stress generative process, you should: 324 CHAPTER FIFTEEN apparent arterial damage, and atherosclerosis may be present without causing hypertension, the two are often Cerebral artery found together in elderly people. The severe pain of Aneurysm angina pectoris may follow the lack of oxygen and the myocardial damage associated with sclerosis of the ves- sels that supply the heart. Posterior communicating ◗ An increase in the amount of urine with the appearance artery of albumin. Albumin is a normal plasma protein usually found in the urine only if there is kidney damage. Other symptoms referable to the kidneys may be caused by renal artery damage. If the dead tissue is invaded by bacteria, the result is gangrene (GANG-grene). The arterial damage that is caused by diabetes, for example, often leads to Figure 15-16 A cerebral aneurysm in the circle of Willis. Philadelphia: Lippincott Williams & Wilkins, Treatment for Arterial Degeneration Balloon 2004.
They protect the liver from gut-derived particulate materials and bacterial products generic suhagra 100mg line. On stimulation by immunomodulators buy cheap suhagra 100 mg, these cells secrete potent mediators of the inflammatory response and play a role in liver immune defense through the release of cytokines that lead to the inactivation of substances considered foreign to the organism suhagra 100 mg visa. The Kupffer cells also remove damaged erythrocytes from the circulation discount suhagra 100mg mastercard. Hepatic Stellate Cells The stellate cells are also called perisinusoidal or Ito cells suhagra 100 mg for sale. There are approximately 5 to 20 of these cells per 100 hepatocytes. The stellate cells are lipid-filled cells (the primary storage site for vitamin A). They also control the turnover of hepatic con- nective tissue and extracellular matrix and regulate the contractility of the sinusoids. When cirrhosis of the liver is present, the stellate cells are stimulated by various sig- nals to increase their synthesis of extracellular matrix material. This, in turn, dif- fusely infiltrates the liver, eventually interfering with the function of the hepatocytes. Pit Cells The CT scan of Amy Biasis’ upper abdomen showed an elevated right The hepatic pit cells, also known as liver-associated lymphocytes, are natural killer hemidiaphragm as well as several cells, which are a defense mechanism against the invasion of the liver by potentially cystic masses in her liver, the largest of toxic agents, such as tumor cells or viruses. Her clinical history as well as her history of possible exposure to various III. MAJOR FUNCTIONS OF THE LIVER parasites while working in a part of Belize, A. The Liver Is a Central Receiving and Recycling Center Central America, that is known to practice substandard sanitation, prompted her physi- for the Body cians to order a titer of serum antibodies The liver can carry out a multitude of biochemical reactions. This is necessary against the parasite Entamoeba histolytica because of its role in constantly monitoring, recycling, modifying, and distributing in addition to measuring serum antibodies all of the various compounds absorbed from the digestive tract and delivered to the against other invasive parasites. If any portion of an ingested compound is potentially useful to that organism, the liver will retrieve this portion and convert it to a substrate that can be used by hepatic and nonhepatic cells. At the same time, the liver removes many of the toxic compounds that are ingested or produced in the body and targets them for excretion in the urine or in the bile. As mentioned previously, the liver receives nutrient-rich blood from the enteric circulation through the portal vein; thus, all of the compounds that enter the blood from the digestive tract pass through the liver on their way to other tissues. The enterohepatic circulation allows the liver first access to nutrients to fulfill specific functions (such as the synthesis of blood coagulation proteins, heme, purines, and pyrimidines) and first access to ingested toxic compounds (such as ethanol) and to + such potentially harmful metabolic products (such as NH4 produced from bacter- ial metabolism in the gut). In addition to the blood supply from the portal vein, the liver receives oxygen- rich blood through the hepatic artery; this arterial blood mixes with the blood from the portal vein in the sinusoids. This unusual mixing process gives the liver access to various metabolites produced in the periphery and secreted into the peripheral circulation, such as glucose, individual amino acids, certain proteins, iron–trans- ferrin complexes, and waste metabolites as well as potential toxins produced dur- ing substrate metabolism. As mentioned, fenestrations in the endothelial cells, combined with gaps between the cells, the lack of a basement membrane between the endothelial cells and the hepatocytes, and low portal blood pressure (which results in slow blood flow) contribute to the efficient exchange of compounds between sinusoidal blood and the hepatocyte and clearance of unwanted com- pounds from the blood. Thus, large molecules targeted for processing, such as serum proteins and chylomicron remnants, can be removed by hepatocytes, degraded, and their components recycled. Similarly, newly synthesized molecules, such as very-low-density lipoprotein (VLDL) and serum proteins, can be easily secreted into the blood. In addition, the liver can convert all of the amino acids found in proteins into glucose, fatty acids, or ketone bodies. The secretion of VLDL by the liver not only delivers excess calories to adipose tissue for storage of fatty acids in triacylglycerol, but it also delivers phospholipids and cholesterol to tissues that are in need of these compounds for synthesis of cell walls as well as other functions. The secretion of glycoproteins by the liver is accomplished through the liver’s gluconeogenic capacity as well as its access to a variety of dietary sugars to form the oligosaccharide chains, as well as its access to dietary amino acids with which is synthesizes proteins. Thus, the liver has the capacity to carry out a large number of biosynthetic reactions. It has the biochemical where- withal to synthesize a myriad of compounds from a broad spectrum of precursors. At the same time, the liver metabolizes compounds into biochemically useful prod- ucts.
The fingers are in a and extensive therapy discount 100mg suhagra visa, still did not use her hand any more postion of comfort and the thumb rests in mild abduction than before generic 100 mg suhagra overnight delivery. She notes that although she had learned to (Figure C8 order suhagra 100mg with mastercard. She was placed in a long arm cast in 80° tie her shoes 100 mg suhagra free shipping, she only used one hand cheap 100mg suhagra amex. She was also having some difficulty getting her transferred flexor carpi ulnaris was performed on the arm into shirt sleeves, especially if the sleeves were a lit- dorsolateral side of the wrist. The transfered tendon had become prominent wrist flexion stretching exercises immediately, and by the (Figure C8. She had graduated from high school and time she went to college, the rest wrist position was at 30° wanted to have something done before she started college to 40° extension, and maximum passive wrist flexion in 2 months. On physical examination she had 50° of was to 10° wrist flexion. On follow-up 1 year later, there dorsiflexion at rest and with maximum active wrist flex- was no significant change from the 3-month postopera- ion, could only get to −30° of wrist flexion. On passive tive visit and she was happy with the result. If finger flexors or flexor carpi radialis are lengthened, the flexor carpi ulnaris is transferred into the extensor carpi radialis brevis if there is minimal residual ulnar deviation. Transfer of the flexor carpi ul- naris to the extensor carpi radialis longus allows for wrist extension in a more radial direction. If there is a significant ulnar deviation deformity, lengthening of the extensor carpi ulnaris should also be performed. For severe wrist deformity with minimal finger flexor contractures but no active finger extension, transfer of the flexor carpi ulnaris should be into the extensor digitorum communis. Wrist flexion is then augmented by plication of the radial wrist extensors or by adding a transfer of the pronator teres to the extensor carpi radialis brevis. This procedure is only indicated for indi- viduals with active finger flexion when the wrist and fingers are passively held in an extended position. The same postoperative routine is used as for the flexor carpi ulnaris transfer alone. Fingers are always included in the cast with 30° to 40° of flexion of the interphalangeal and metacarpal phalangeal joints. Upper Extremity 413 For individuals with very severe wrist deformities, the indications for treatment are usually due to problems with custodial care, such as having problems getting arms in shirt sleeves and problems keeping the wrist flex- ion crease clean. The primary treatment for these deformities is wrist fusion by shortening the wrist. The shortening is provided by excision of the carpal bones, usually the proximal row, but in some severe cases all the carpal bones are removed, and the distal metacarpals are fused to the radius. In- ternal fixation of the wrist is provided with crossed K-wires or a dorsal plate (Case 8. The use of a small external fixator has been reported,29 but this seems to be overly invasive for severely neurologically involved individuals Case 8. The sented with the mother’s complaint that she had difficulty pronator tendon was released by distal tenotomy. Proxi- in keeping the wrist and hand clean, especially in the sum- mal row carpectomy and wrist joint resection allowed mer when the hand would sweat and develop a very foul correction of the wrist deformity, which was then fused odor (Figure C8. Neither of the upper extremities had using a plate for stabilization (Figures C8. On physical examination the elbow The finger flexors had myofascial lengthening in the had 70° flexion contracture, the forearm could not be forearm and the finger extensor tendons were plicated. A rotated to neutral, the wrist lacked 40° in coming to neu- myotomy of the adductor pollicis and the first dorsal in- tral extension, and in this position, the fingers were flexed terosseous muscles was performed. The thumb was extended but position of the limb looked good. In our experience, bony fusion seems less important than adequate decompression and lengthening of the spastic finger flexors to prevent later finger clawing. Postoperative therapy is less important than with tendon transfer cases. Wrist extension contractures seldom become severe enough to need treatment unless they are the result of the overcorrection of a wrist flexion treatment. If there is a significant wrist extension with poor wrist flexor strength, this extension is much more likely to come from the residual im- balance of an incomplete spinal cord injury.
9 of 10 - Review by W. Connor
Votes: 268 votes
Total customer reviews: 268