Gene/Protein Disease Symptom Drug Enzyme Compound
Pivot Concepts:   Target Concepts:
Query: UMLS:C0038454 (stroke)
 147,016 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Two aspects of the recovery period after endurance exercise were investigated: a) the fluid distribution between the intra- and extravascular parts of the extracellular fluid volume (ECFV) induced by exercise dehydration, b) the cardiovascular response pattern [blood pressure (BP), heart rate (HR), cardiac output (CO), total peripheral resistance (TPR), and central venous pressure (CVP)] to the heat load which results from the preceding exercise. Seven conscious dogs performed endurance exercise in a cool environment (16 degrees C) on a horizontal treadmill till 4% of the body weight was lost. It was found that about 70% of the total fluid loss of the body came from intracellular water. During exercise sodium and chloride concentrations rose by 6 mMol and 7 mMol respectively (P less than 0.005) and remained elevated throughout the early recovery period indicating a fluid loss of about 100-200 ml out of the ECFV. Direct measurements of the ECFV as sulfate space confirmed these values. Since the plasma volume remained unchanged, this fluid loss was carried totally by the interstitial fluid volume. Immediately after exercise body temperature was elevated by 1.5 degrees C and returned towards control within 90 min. Cardiac output was above control level for 2 h after the end of exercise, at first due to an increased HR and thereafter to an elevated stroke volume (SV) (P less than 0.02). CVP and TPR were below control levels for at least 2 h (P less than 0.01). A linear correlation was found between CVP and TPR. A close correlation existed between the body temperature and the cardiovascular parameters. It can be concluded that even long after exercise the cardiovascular system has to serve thermoregulatory needs.
 ...
PMID:Extracellular fluid volume and central circulation after long lasting exercise and dehydration in conscious dogs. 55 92

A case is reported of heat stroke associating dehydration, anuria, muscle disorders and early hypercalcemia. All disorders disappeared within 48 hours with rehydration. Early hypercalcemia differs from late hypercalcemia reported at resumption of diuresis. Early hypercalcemia might result from blood concentration with hyperproteinemia and release of bone calcium under the action of PTH. Its prognosis is good, which is not the case of late hypercalcemia.
 ...
PMID:[Heat stroke with anuria, muscular disorders and early hypercalcemia]. 84 41

We observed a 16-month-old infant with residual brain damage following a heat stroke from being left in a parked automobile. In contrast with adults, in whom heat stroke usually follows strenuous exercise, the condition in infants usually results from excessive environmental temperature and/or dehydration. Early recognition of the illness is imperative. Three cardinal freatures are hot, dry skin, central nervous system disturbance, and hyperpyrexia. Immediate treatment should be aimed at improving circulation with volume expanders and rapid cooling. Other supportive measures may be necessary to control seizures, renal failure, hematologic abnormalities, or hepatic involvement.
 ...
PMID:Heat stroke in infancy. 98 9

Ingestion of approximately 30-60 g of carbohydrate during each hour of exercise will generally be sufficient to maintain blood glucose oxidation late in exercise and delay fatigue. Since the average rates of gastric emptying and intestinal absorption exceed 1,250 ml.h-1 for water and solutions containing up to 8% carbohydrate, exercising people can be supplemented with both carbohydrate and fluids at relatively high rates. When cyclists exercise at competitive intensities for 2 h in the heat with a sweat rate of 1,400 ml.h-1, it is clear that the closer that fluid consumption matches sweating rate (at least up to 80% of sweating rate), the better. Increasing dehydration, due to inadequate fluid consumption, directly impairs stroke volume, cardiac output, and skin blood flow, which results in larger increases in body core temperature, heart rate, and ratings of the difficulty of exercise. This same phenomenon probably also applies to running, which argues against the notion that a certain amount of dehydration (i.e., up to 3%) is permissible and without major cardiovascular consequences. However, runners generally drink only 500 ml.h-1 of fluid and thus allow themselves to dehydrate at rates of 500-1,000 ml.h-1. The performance question boils down to "Will the time lost as a result of drinking larger volumes be compensated by the physiological benefits drinking produces and the faster running pace that might be achieved during the last half of the race?" However, if the goal is safety, which means minimizing hyperthermia, there is no question that the closer that the rate of drinking can match the rate of dehydration, the better.
 ...
PMID:Benefits of fluid replacement with carbohydrate during exercise. 140 5

A retrospective analysis of the medical charts of 117 patients (50 men and 67 women) with multi-infarct dementia took place. All patients admitted to the psychogeriatric nursing home 'Joachim en Anna' in Nijmegen between 1980 and 1989 were studied. The aim of the study was to obtain epidemiological information and to investigate the prevalence of comorbid conditions, prognosis and mortality. The results were compared with patients with Alzheimer's disease. The patients remained in the institute for 1.4 years and the mean total duration of the disease was 5.3 years. About twenty-five percent died in the first three months of admission. Life expectation, counted from time of admission, was 6 years shorter in comparison with Dutch mortality tables. Morbidity frequently seen at admission included circulatory system diseases and cerebrovascular accidents. The risk factor hypertension was seen in a smaller percentage of patients than expected. During the stay the diseases most frequently diagnosed were respiratory and urinary tract infections, adverse effects of drugs, constipation and chronic ulcers of the skin. About twenty percent of the patients were struck by a (recurrent) cerebrovascular accident or a transient ischaemic attack. Most patients died of dehydration or bronchopneumonia. There was, apart from the diagnosis of multi-infarct dementia, no single patient aspect that could predict a poor prognosis. Nursing home patients with multi-infarct dementia are clearly different from patients with Alzheimer's disease. Time spent in the nursing home and duration of disease are shorter. They have more comorbid conditions, especially of a cardiovascular nature, and they have a poor life expectation.
 ...
PMID:[Multi-infarct dementia in nursing home patients; more comorbidity and shorter life expectancy than in Alzheimer's disease]. 143 2

This investigation determined the effect of different rates of dehydration, induced by ingesting different volumes of fluid during prolonged exercise, on hyperthermia, heart rate (HR), and stroke volume (SV). On four different occasions, eight endurance-trained cyclists [age 23 +/- 3 (SD) yr, body wt 71.9 +/- 11.6 kg, maximal O2 consumption 4.72 +/- 0.33 l/min] cycled at a power output equal to 62-67% maximal O2 consumption for 2 h in a warm environment (33 degrees C dry bulb, 50% relative humidity, wind speed 2.5 m/s). During exercise, they randomly received no fluid (NF) or ingested a small (SF), moderate (MF), or large (LF) volume of fluid that replaced 20 +/- 1, 48 +/- 1, and 81 +/- 2%, respectively, of the fluid lost in sweat during exercise. The protocol resulted in graded magnitudes of dehydration as body weight declined 4.2 +/- 0.1, 3.4 +/- 0.1, 2.3 +/- 0.1, and 1.1 +/- 0.1%, respectively, during NF, SF, MF, and LF. After 2 h of exercise, esophageal temperature (Tes), HR, and SV were significantly different among the four trials (P < 0.05), with the exception of NF and SF. The magnitude of dehydration accrued after 2 h of exercise in the four trials was linearly related with the increase in Tes (r = 0.98, P < 0.02), the increase in HR (r = 0.99, P < 0.01), and the decline in SV (r = 0.99, P < 0.01). LF attenuated hyperthermia, apparently because of higher skin blood flow, inasmuch as forearm blood flow was 20-22% higher than during SF and NF at 105 min (P < 0.05). There were no differences in sweat rate among the four trials. In each subject, the increase in Tes from 20 to 120 min of exercise was highly correlated to the increase in serum osmolality (r = 0.81-0.98, P < 0.02-0.19) and the increase in serum sodium concentration (r = 0.87-0.99, P < 0.01-0.13) from 5 to 120 min of exercise. In summary, the magnitude of increase in core temperature and HR and the decline in SV are graded in proportion to the amount of dehydration accrued during exercise.
 ...
PMID:Influence of graded dehydration on hyperthermia and cardiovascular drift during exercise. 144 78

Measures to prevent ischemic stroke after aneurysmal subarachnoid hemorrhage include management of fluids to avoid dehydration, use of calcium entry blocking drugs, and when necessary, therapy with drug-induced hypertension and hypervolemic hemodilution. Promising treatments that may also prove to be effective include 21-aminosteroids, intrathecal thrombolytic therapy, and transluminal angioplasty.
 ...
PMID:Prevention of brain ischemia after aneurysmal subarachnoid hemorrhage. 155 6

Four hundred consecutive hip fractures were studied prospectively. Two hundred forty-seven patients were classified as unhealthy (poor cardiac status, pneumonia, cancer history, bowel obstruction history, malnutrition, dehydration, stroke history, renal failure history, cirrhosis). Twenty-two percent of this unhealthy group died, while only 6% of the remaining healthy group died. Death rates varied with admission activity level and mental status but not when patient health status was factored out. After factoring out health status, age was associated with higher death rates only in patients older than age 85. Confusion, a change of mental status in the hospital, occurred in 25% of patients. Confusion was associated with a medical complication in 94% of cases, was the presenting symptom of a medical complication in 79% of cases, and was associated with a 39% death rate. Major medical complications occurred in 9% of the healthy group (29% of them died) and 21% of the unhealthy group (64% of them died). Major medical complications in unhealthy, shut-in patients were associated with an 80% death rate. Vigorous urinary tract monitoring and early treatment of bacteriuria decreased death rate. Postfracture malnutrition was associated with higher complication rates. Hip surgery performed within 72 hours on patients with acute medical illnesses in addition to their fracture was associated with a higher death rate. Whether a patient walked postfracture seemed not to be correlated with the death rate. Patients who were not walking prefracture but treated by internal fixation had a 34% failure rate.
 ...
PMID:Hip fracture mortality. A prospective, multifactorial study to predict and minimize death risk. 161 47

This study examined the influence of both hydration and blood glucose concentration on cardiovascular drift during exercise. We first determined if the prevention of dehydration during exercise by full fluid replacement prevents the decline in stroke volume (SV) and cardiac output (CO) during prolonged exercise. On two occasions, 10 endurance-trained subjects cycled an ergometer in a 22 degrees C room for 2 h, beginning at 70 +/- 1% maximal O2 uptake (VO2max) and in a euhydrated state. During one trial, no fluid (NF) replacement was provided and the subject's body weight declined 2.09 +/- 0.19 kg or 2.9%. During the fluid replacement trial (FR), water was ingested at a rate that prevented body weight from declining after 2 h of exercise (i.e., 2.34 +/- 0.17 1/2 h). SV declined 15% and CO declined 7% during the 20- to 120-min period of the NF trial while heart rate (HR) increased 10% and O2 uptake (VO2) increased 6% (all P less than 0.05). In contrast, SV was maintained during the 20- to 120-min period of FR while HR increased 5% and thus CO actually increased 7% (all P less than 0.05). Rectal temperature, SV, and HR were similar during the 1st h of exercise during NF and FR. However, after 2 h of exercise, rectal temperature was 0.6 degree C higher (P less than 0.05) and SV and CO were 11-16% lower (P less than 0.05) during NF compared with FR.(ABSTRACT TRUNCATED AT 250 WORDS)
 ...
PMID:Fluid replacement and glucose infusion during exercise prevent cardiovascular drift. 175 23

Ninety cases of cerebral hemorrhage or infarction confirmed with CT scans were reported. Blood specimens were taken within 4 to 24 hours after the onset of the strokes for blood gas analysis. The results showed that respiratory alkalosis occurred in all patients with cerebral hemorrhage or embolism, while the metabolic acidosis accompanied only those with severe cerebral infarctions or intracerebral hematomas rupturing into the ventricles small local infarcts caused only hypoxemia or no changes at all. It seemed likely that the blood acid-base changes were closely related to the nature and the size of the lesions. It was suggested that since hyperventilation caused by cerebral lesions might be the main factor that give rise to respiratory alkalosis, it would be of great importance to maintain the acid base balance in the acute stage of the stroke with proper dehydration therapy and oxygen administration.
 ...
PMID:[Acid-base imbalance in acute cerebrovascular diseases]. 180 63


1 2 3 4 5 6 7 8 9 10 Next >>