(n.) The quarter of a circle, or of the circumference of a circle, an arc of 90¡, or one subtending a right angle at the center.
(n.) One of the four parts into which a plane is divided by the coordinate axes. The upper right-hand part is the first quadrant; the upper left-hand part the second; the lower left-hand part the third; and the lower right-hand part the fourth quadrant.
(n.) An instrument for measuring altitudes, variously constructed and mounted for different specific uses in astronomy, surveying, gunnery, etc., consisting commonly of a graduated arc of 90¡, with an index or vernier, and either plain or telescopic sights, and usually having a plumb line or spirit level for fixing the vertical or horizontal direction.
Example Sentences:
(1) Left ventricular synchrony was assessed from regional volume curves derived by dividing the global ventricular region of interest into four quadrants.
(2) The authors report the clinical case of an 18-year-old patient who presented with a symptomatic mass in the left upper quadrant 6 months after having infectious mononucleosis.
(3) One patient required evacuation and open packing of the right upper quadrant and lower right hemithorax.
(4) Following this combination procedure the patients were relieved completely of obstructive jaundice and right upper quadrant pain, leaving only small trocar insertion scars made during the short course of hospitalization.
(5) The axons of 12 SRT cells were located in the ventrolateral or ventral quadrants of the upper cervical spinal cord.
(6) Double ballooning is recommended for cases with retinal detachments with 2 ruptures up to 2 disc diameters in length, located at a distance of 2-3 disc diameters from each other within one quadrant or in different quadrants of the fundus oculi.
(7) The dendritic-field diameters of parasol cells within the nasal quadrant of the retina are not fully brought into line with those of cells lying elsewhere in the retina.
(8) Lymphatic tumor emboli were observed in quadrants in 18 or 2.0% of the cases.
(9) Four cases of right lower quadrant abscess, each a clinical diagnostic dilemma, were recognized as abscesses surrounding a perforated viscus by application of the "coffee bean" sign on sonographic examination.
(10) However, 9 months later, while still asymptomatic, routine physical examination revealed a recurrent right lower quadrant tumor.
(11) The case of a 15-years-old female patient is presented, who referred pain and presence of a mass in the left upper quadrant of the abdomen.
(12) The two patients were women, one a 45-year-old who consulted for pain, epigastric discomfort and melenas, and the other a 76-year-old who consulted for paraneoplastic syndrome and a palpable mass in the right lower quadrant.
(13) A 58-year-old man complained of dull left lower quadrant pain and constipation.
(14) Presenting symptoms included: crampy right upper quadrant pain, jaundice, pruritus, cholangitis, pancreatitis, hepatomegaly, and elevated liver function tests.
(15) Cellular abnormalities were demonstrated in 90.4% of women having scrapings of visible lesions and in 88.1% of women studied by 4-quadrant vaginal scrapings in the absence of clinical disease.
(16) A persistent elevation of the level of serum alkaline phosphatase or more overt clinical manifestations, such as pain in the right upper quadrant, hepatomegaly, obstructive jaundice or weight loss, would all indicate the need for further investigations.
(17) The factors found to influence the postoperative outcome adversely include (1) association of severe blunt trauma (P less than 0.05), (2) anterior proliferative vitreoretinopathy (PVR) involving two or more quadrants (P less than 0.01), and (2) retinotomies (P less than 0.007).
(18) The most frequent side effect was temporary pain in the right upper abdominal quadrant.
(19) Following cardiac excision, three adjacent 80-mg tissue samples were taken from the subendocardial, mid-wall, and subepicardial layers of quadrantal left ventricular (LV) segments of the basal and midventricular cardiac slices, and from one segment of the apical slice, totaling 81 samples per LV.
(20) When the frozen or paraffin section diagnosis of a generous excisional biopsy was noninvasive breast carcinoma, there was a substantial risk that foci of the same type of noninvasive carcinoma were also present in other quadrants.
Sextant
Definition:
(n.) The sixth part of a circle.
(n.) An instrument for measuring angular distances between objects, -- used esp. at sea, for ascertaining the latitude and longitude. It is constructed on the same optical principle as Hadley's quadrant, but usually of metal, with a nicer graduation, telescopic sight, and its arc the sixth, and sometimes the third, part of a circle. See Quadrant.
(n.) The constellation Sextans.
Example Sentences:
(1) Treatment needs were determined by the worst periodontal score per sextant.
(2) Pathologic pockets of 6 mm or more were found in 1.3 and 0.3 sextants in the diabetic and control group subjects, respectively (P less than 0.001).
(3) Neither were any differences found in the periodontal condition related to the duration and control of diabetes, whereas diabetics with advanced retinopathy demonstrated more sextants with deep pockets.
(4) A randomized four-sextant treatment design was used.
(5) The value of digital rectal examination, computerized tomography, magnetic resonance imaging, prostate-specific antigen, transrectal ultrasonography, and systematic-sextant biopsy in the identification of lymph node-positive patients before radical prostatectomy was analyzed in 103 men who had pelvic lymph node dissection, CT had a sensitivity of only 7% and a specificity of 96% in detecting lymph nodes, whereas magnetic resonance imaging had a sensitivity of 50% and a specificity of 100%.
(6) Based on the Community Periodontal Index of Treatment Needs (CPITN) it can be stated that more than 90% of the adult population of 25 years and over needs oral hygiene education and scaling in one of more sextants (TN2).
(7) The mean number of missing sextants was also significantly higher in diabetics.
(8) Very few patients had 'healthy' periodontal sextants at the first visit; the most frequent CPITN category was 3.
(9) Any child with two or more sextants or teeth with CPITN code 3 or one sextant code 4 was taken for a radiographic and full clinical examination.
(10) The mean number of sextants requiring scaling was 0.6 per person at age 17 in Espoo as compared to 4.5 at 18.5 yr of age in Chiangmai.
(11) There are broad differences in the numbers of healthy sextants between developing countries and those which are highly industrialized.
(12) Straight rods, fusiforms and motile rods correlated negatively to the number of healthy sextants per subject.
(13) In general, females were healthier than males, had a significantly greater number of healthy sextants, less sextants with calculus and less sextants with deep pockets.
(14) Posterior sextants with CPITN Code 4 were more likely treated with surgery than sextants with CPITN Code 3.
(15) per sextant in the Spaniard population under 20 years of age.
(16) One maxillary sextant was splinted, while the other was unsplinted.
(17) Four pockets per patient, one in each posterior sextant, were chosen.
(18) Partial mouth random recording (2 upper and 1 lower or 1 upper and 2 lower sextants) was made by CPITN of 150 sextants, and at 6 sites around each tooth in each sextant for each index using a pressure-sensitive probe, with Newman tip and Williams markings, and a WHO 621 tip, probing pressure 0.25 N. Ranges of each index were compared with corresponding CPITN data.
(19) Surgical therapy was effective over all levels of disease severity and was the preferred form of therapy with respect to reduction of probing depth except for sextants exhibiting 4 to 5 mm pockets.
(20) While plaque and calculus were present in many sextants, there was little intense gingivitis and signs of advanced periodontal diseases were rarely present.