persistent

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persistent

(pər-sĭs′tənt)
adj.
1. Existing or remaining in the same state for an indefinitely long time; enduring: persistent rumors; a persistent infection.
2. Botany Lasting past maturity without falling off, as the calyx on an eggplant or the scales of a pine cone.
3. Zoology Retained permanently, rather than disappearing in an early stage of development: the persistent gills of fishes.

per·sis′tent·ly adv.

persistent

relative to embryological defects refers to persistence of an entity into external life in such a way as to cause some reduction of efficiency. The common defects are listed under the names of the compromised organs. See also persistent right aortic arch, ductus arteriosus, penile preputial frenulum, imperforate hymen, persistent urachus, persistent hyperplastic vitreous, persistent pupillary membrane.

persistent corpus luteum
see corpus luteum.
persistent ductus arteriosus
see patent ductus arteriosus.
persistent ductus venosus
see ductus venosus.
persistent omphalomesenteric duct
persistent posterior perilenticular vascular tunic
the tunic is generated in the embryo but atrophies just before birth. Persistence of some part of the tunic into adult life is common but of no clinical significance.
persistent recumbency
the animal is normal in other respects but does not rise to its hooves for a period exceeding 24 hours.
persistent right aorta arch
see persistent right aortic arch.
persistent truncus arteriosus
may cause neonatal congestive heart failure and cyanosis; the interventricular septum is usually patent. See also truncus arteriosus.

Patient discussion about persistent

Q. Have you ever heard that vaccines cause autism? If so why such thought persist? Hi my new friends! Hope you are all in good health! Have you ever heard that vaccines cause autism? If so why such thought persist? I look forward to reading all of your answers tomorrow.

A. Yes I heard about that and avoided being injected sometimes. This belief persists because signs of autism may appear around the same time that children receive the vaccine that prevents measles, mumps and rubella, and some parents worry that the vaccine caused the autism.

Q. Can lung cancer be diagnosed on behalf of persistent cough? My father is a heavy smoker. He smoked for all his adult life and he never stopped. In the last few weeks he started to have persistent cough attacks. Can those attacks be the first sign of lung cancer?

A. Smoking can damage the lung in many ways. The fact that someone that is a smoker is suffering from chronic cough doesn't mean that he is suffering from lung cancer. To get a cretin diagnosis you will have to do a chest X-ray.
here is a X-ray with the lesion that might be an actual lung cancer
http://www.e-radiography.net/technique/chest/cxreval20.jpg

Q. Headache that won’t go away. Help! Hi, I’m 47 years old man, working as accountant. Yesterday afternoon, I came back home, and after some time I started to feel headache that still going. Is it dangerous? Is it possible I have something like bleeding? I wasn’t hit or injured in anyway in my head before this headache appeared

A. There are two types of headaches: primary headaches and secondary headaches. Primary headaches are not associated with (caused by) other diseases. Examples of primary headaches are migraine headaches, tension headaches, and cluster headaches. Secondary headaches are caused by associated disease. The associated disease may be minor or serious and life threatening. Tension headaches are the most common type of primary headache. Tension headaches are more common among women than men. Migraine headaches are the second most common type of primary headache. Secondary headaches have diverse causes, ranging from serious and life threatening conditions such as brain tumors, strokes, meningitis, and subarachnoid hemorrhages to less serious but common conditions such as withdrawal from caffeine and discontinuation of analgesics. http://www.medicinenet.com/headache/article.htm In any case if your headache continues you should see your doctor immediately. Hope this helps.

More discussions about persistent
References in classic literature ?
May it please the court, the state has claimed, strenuously and persistently, that the bloodstained fingerprints upon that knife handle were left there by the assassin of Judge Driscoll.
The science of our time has attacked but a little department of the field of human disease, but even so, it spreads its operations very steadily and persistently.
Suddenly I saw beside me two wide open eyes scrutinising me curiously and persistently.
By persistently hanging on the enemy's flank, we shall succeed in the long run in killing the commander-in-chief.
It is much to be regretted that in our rank of life the wife should be so persistently frivolous, under the impression apparently that it is the proper thing to be.
Achilles will kill Hector to avenge Patroclus, and from that time I will bring it about that the Achaeans shall persistently drive the Trojans back till they fulfil the counsels of Minerva and take Ilius.
This gentleman had risen early the morning of the day on which this history begins, and had placed himself at the window of his salon, seated upon the ledge, and leaning upon the rail of the balcony, gazing sadly but persistently on both sides of the street, watching, no doubt, for the arrival of the traveler he had mentioned to the host.
YET, through the Wades' busy days the echo of little Rose's visit lingered persistently.
The ceremony, as shortly announced in the papers of yesterday, occurred on the previous morning; but it is only now that it has been possible to confirm the strange rumours which have been so persistently floating about.
Our road was persistently upwards, and as we ascended the woods became thinner and lost their tropical luxuriance.
Taciturn as he was, the investigator succeeded at last in extracting a scrap of information from him, by dint of ordering beer and talking to him persistently and minutely on the subject of motor cars.
Each pedestrian could see no halo but his or her own, which never deserted the head-shadow, whatever its vulgar unsteadiness might be; but adhered to it, and persistently beautified it; till the erratic motions seemed an inherent part of the irradiation, and the fumes of their breathing a component of the night's mist; and the spirit of the scene, and of the moonlight, and of Nature, seemed harmoniously to mingle with the spirit of wine.