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An amniocentesis is typically performed in the second trimester between the 15th and 20th week of gestation. [5] Women who choose to have this test are primarily those at increased risk for genetic and chromosomal problems, in part because the test is invasive and carries a small risk of pregnancy loss . [ 5 ]
The true number of cases of carbon monoxide poisoning is unknown, since many non-lethal exposures go undetected. [29] [52] From the available data, carbon monoxide poisoning is the most common cause of injury and death due to poisoning worldwide. [53] Poisoning is typically more common during the winter months.
Suicide by carbon monoxide poisoning may be attempted by running the engine in an enclosed garage, or by piping the exhaust gas into the driver's compartment with a hose, but catalytic converters required for air quality regulations eliminate over 99% of carbon monoxide produced. [1]
Carbon monoxide poisoning, also known as carboxyhemoglobinemia, [29] [30] has plagued humankind since primitive ancestors first harnessed fire. In modern times, carboxyhemoglobin data assist physicians in making a poisoning diagnosis. However, carboxyhemoglobin levels do not necessarily correlate with the symptoms of carbon monoxide poisoning. [31]
Poisoning refers specifically to chemical deactivation, rather than other mechanisms of catalyst degradation such as thermal decomposition or physical damage. [1] [2] Although usually undesirable, poisoning may be helpful when it results in improved catalyst selectivity (e.g. Lindlar's catalyst).
An amniocentesis is a procedure in which a sample of amniotic fluid is aspirated using a needle that is inserted into the abdomen guided by ultrasound. [1] The sample is then tested, and can help doctors diagnose genetic disorders, birth defects, or other fetal health problems.
After the details of this suicide were highly publicised by local media, many others killed themselves in this way (an example of the Werther effect). Within two months, charcoal-burning had become the third major suicide killer in Hong Kong. [6] Charcoal-burning suicide accounted for 1.7% of Hong Kong suicides in 1998 and 10.1% in 1999. [7]
Oxidation of carbon monoxide to carbon dioxide: 2CO + O 2 → 2CO 2; Oxidation of hydrocarbons (unburnt and partially burned fuel) to carbon dioxide and water: C x H 2x+2 + [(3x+1)/2]O 2 → xCO 2 + (x+1)H 2 O (a combustion reaction) The two-way catalytic converter is widely used on diesel engines to reduce hydrocarbon and carbon monoxide ...