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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.


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

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. In any case if your headache continues you should see your doctor immediately. Hope this helps.

More discussions about persistent
References in periodicals archive ?
Nonwhite race and history of atopy were the strongest predictors of persistently active disease each lowered the odds of complete disease control by almost 50% (odds ratio, 0.
However, Rachel Alexandra was racing over this 1m2f trip for the first time and started to really feel the effects of her duel in the final furlong when Persistently rolled down the lane to gallop past and claim a length victory.
A fading recovery, persistently high unemployment, Europe's debt troubles and commercial real estate losses have garnered most of the attention.
These persistently infected cattle are responsible for 27% of the loss attributed to this disease.
Tory schools spokeswoman Liz Smith said: "When it comes to persistently unruly pupils, we need to take them out of mainstream education and teach them in centres until they know how to behave.
5 days, and in Hartlepool there were 90 pupils persistently absent and 740 who missed more than 13.
Inclusion criteria of ISTSH were appropriate doses of L-T4, improvement of clinical findings, normalization of serum total T4 levels and persistently high TSH concentrations.
I want to see greater use of parenting orders and contracts and Asbos when young people are caught persistently drinking in public.
However, short-term inflation is likely to remain persistently high, due in large part to repeated increases in food and energy prices.
MORE than 2,000 pupils from schools across Kirklees are persistently absent from lessons, according to new figures.
Retailers who persistently sell alcohol to youngsters face being shut down under new on-the-spot measures.
However, the hyperbolic coverage of New Orleans' jazz legacy and Mardi Gras madness has persistently annoyed me.