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Query: UMLS:C0085383 (hypocapnia)
 1,697 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Examination of 28 agitated, hyperventilating patients with fetal tachycardia showed that the mothers were in a hyperventilation-related state of hypocapnia and alkalosis. The mean maternal pCO2 was 17.48 +/- 6.79 mm Hg, the pH 7.54 +/- 0.14, which caused a reflex spasm of the umbilical veins, fetal acidosis and fetal tachycardia. Additional experiments on sheep revealed a similar correlation between maternal hyperventilation, hypocapnia, respiratory alkalosis and fetal tachycardia while the flow volume of the uterus showed no change.
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PMID:Maternal hyperventilation as a possible cause of fetal tachycardia sub partu. A clinical and experimental study. 642 85

Pygmy goats in the last third of pregnancy were trained to walk on a treadmill at rates up to 2.0 mph and up an inclination of 0-15 degrees. Electromagnetic flowmeters were placed unilaterally on a uterine artery, and measurements were made while the goats were standing quietly on the treadmill and during 5 min of exercise. Blood flow fell during exercise in all five animals studied, and this reduction was proportional to the level of exertion. At the highest level of exercise that these animals would voluntarily perform, uterine artery blood flow fell by 32 +/- 3 (SE) % (P less than 0.001) from control. In four additional animals the radioactive microsphere technique was used to measure uterine blood flow at rest and after 5-7 min of exercise. In these animals, exercise caused total uterine blood flow to fall by 18 +/- 10%; cotyledonary (placental) blood flow fell by 8 +/- 13%, while myoendometrial blood flow decreased by 52 +/- 12% (P less than 0.05). Thus nonplacental portions of the pregnant Pygmy goat uterus suffer major reductions in blood flow during exercise. This vasoconstriction may be due to exercise per se or to concomitant hypocapnia or hyperthermia. Singleton and twin kids born to animals that exercised were of normal birth weight.
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PMID:Effect of exercise on uterine blood flow in the pregnant Pygmy goat. 669 32

In birds, hyperthermia is normally associated with panting and progressive respiratory alkalosis. The effect of respiratory alkalosis on capillary blood flow distribution was examined by artificially hyperventilating normothermic fowls, thereby dissociating it of the normally occurring concomitant hyperthermia. In contrast with mammals, in which hyperventilation associated with hypocapnia reduced blood flow to the brain, uterus and other organs, in the hen blood flow distribution in most organs remained unaltered. This indicates that the potential change in acid-base balance which develops in the hyperthermic birds during panting is not likely to affect the regulation of blood flow. The comb and wattles were the only affected organs, in which capillary blood flow diminished to about 45% of normal values. This reduction did not prevent a vasodilatation in those organs in hyperthermic fowls, though it probably limited its full expression.
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PMID:Blood flow distribution during artificially induced respiratory hypocapnic alkalosis in the fowl. 681 2

A 51 year old woman was admitted for night dyspneic attacks and fainting. When hospitalised the patient reported in the previous 10 days dry cough, edema and pain (left leg). The woman's medical history did not show any risk factors for vein thromboembolism, d-dimer dosage appeared increased and arterial blood gas showed hypoxemia and hypocapnia. ECG and chest X-Rays were within normal limits; a chest CT diagnosed pulmonary embolism that was treated with thrombolytic therapy. Venous lower extremity ultrasound detected ilio-femoral and popliteal venous thrombosis and an abdominal CT showed a swollen and fibromatous uterus, obstructing the left iliac vein system. Thrombolytic therapy was effective to for pulmonary embolism and to begin recanalization of the iliac, femoral, and popliteal veins. The patients was sent home in good clinical conditions, with anticoagulant therapy; later the uterine fibroma was treated with hysterectomy.
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PMID:Deep vein thrombosis and pulmonary embolism in a patient affected by uterine fibroids: clinical case. 2324 42