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Search Results: 1 - 10 of 118276 matches for " T. Yip "
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Malaysian Family Physician , 2009,
Abstract: Background: Breast cancer is becoming more important in Asia since it affect the younger age group. Question arises whether it is safe for breast lesions to be left in-situ if all the elements in triple assessment are benign. The aim of this study is to audit all the excision biopsies of breast lumps done in the University Malaya Medical Centre (UMMC), to review the association of age with the type of pathological finding and to evaluate the rate of carcinoma in these biopsies. Methods: We conducted a retrospective study of all women who had excision biopsy of a breast lump in the University Malaya Medical Centre from January 2005 to December 2006. All patients with malignant preoperative biopsies were excluded. Results: Of 717 lesions in 664 patients, 459 (64%) were fibroadenoma, 114 (15.9%) were fibrocystic disease, 20 (2.8%) were phylloides tumour, 27 (3.8%) were papilloma, 59 (8.2%) were malignant and 38 (5.3%) were of other pathology. Of the 717 open biopsies, 449 (62.6%) had fine-needle aspiration cytology (FNAC), 31 (4.3%) had core needle biopsy (CNB), while 14 (2.0%) had both FNAC and CNB done prior to excision biopsy. 251 (35%) had neither FNAC nor CNB. The incidence of fibroadenoma decreased with increasing age and the incidence of fibrocystic changes and papilloma increased with increasing age. There was no association of age with phylloides tumour. The incidence of unexpected malignancy increased with increasing age. The incidence rates were 0.3%, 4.5%, 19.4%, 29.7% and 29.6% for the age group below 30, 30-39, 40-49, 50-59 and above 60 years of age respectively. Of the 59 malignant lesions, FNAC was performed on 47 (79.7%) and CNB on 16 (27.1%). 9 had both FNAC and CNB and 3 had neither FNAC nor CNB. Out of the 56 lesions where FNAC/CNB were done, 23 (41.1%) were reported as benign, 20 (35.7%) as suspicious, 4 (7.1%) as atypical, 5 (8.9%) as inadequate, 2 (3.6%) as equivocal and 2 (3.6%) as lymphoid lesions. Out of the 23 prior biopsies reported as benign, 22 were in the age group above 40. Conclusions: In conclusion, the rate of unexpected malignancy in open biopsies increases with age. It is recommended that all women above the age of 40 presenting with a palpable breast lump or a suspicious non-palpable abnormality on screening mammogram to have their lump excised even though the lump is benign on FNAC or CNB. However, women age of 30 to 39 should also have the lump excised in the presence of other risk factors such as family history of breast cancer
The Choice of Peritoneal Dialysis Catheter Implantation Technique by Nephrologists
T. Yip,S. L. Lui,W. K. Lo
International Journal of Nephrology , 2013, DOI: 10.1155/2013/940106
The Choice of Peritoneal Dialysis Catheter Implantation Technique by Nephrologists
T. Yip,S. L. Lui,W. K. Lo
International Journal of Nephrology , 2013, DOI: 10.1155/2013/940106
Abstract: Peritoneal dialysis catheter (PDC) is the lifeline of peritoneal dialysis (PD) patients. One of the critical issues for successful PD is a well-functioning PDC which is timely inserted. It is the implantation technique rather than the catheter design that determines the outcome of the catheter. Dedication in acquiring the appropriate technique is vital to the success of a PD program. In this paper, we discuss the pros and cons of various techniques used for PDC implantation. A detailed description of PDC implantation by using the minilaparotomy method is presented. We strongly recommend mini-laparotomy as the method of choice for PDC implantation by nephrologists. Peritoneal dialysis (PD) is a well-established technique of renal replacement therapy in patients with end-stage renal disease (ESRD). The advantages of PD include preservation of residual renal function, better patient survival in the first few years, better quality of life and cost-effectiveness over hemodialysis [1–4]. Thus, PD is well suited to act as a first-line renal replacement therapy in an integrated approach to end-stage renal failure care. In Hong Kong, “PD-first” policy has been adopted since mid-1980s. Currently, up to 80% of ESRD patients on maintenance dialysis are on PD. It has provided a successful model for the PD first policy. For a PD program to succeed, access to peritoneal dialysis catheter (PDC) implantation must be timely and the procedure must be performed by an experienced operator with low catheter failure rates and complications. PDC can be implanted percutaneously or by open surgery (Table 1). The standard percutaneous placement includes the “trocar and cannula” method and the Seldinger technique, with variations like fluoroscopy-assisted or peritoneoscopy-assisted placement. Open surgical approach includes minilaparotomy and laparoscopic placement. Table 1: Comparison of different methods of peritoneal dialysis catheter implantation. In many centers, PDC is implanted by surgeons, either by minilaparotomy or laparoscopic approach. However, referral to surgeons usually causes delay in initiating PD therapy, for both the waiting time to see a surgeon and the time required to arrange the operation afterwards. The date of implantation is often not under the control of nephrologists and this may make timely implantation of a PDC an impossible dream. Some patients may be forced to remain on hemodialysis with a central venous catheter, which is associated with an accelerated decrease in residual renal function and high rates of bacteremia and mortality. Survival data
Resonant pairing between Fermions with unequal masses
S. -T. Wu,C. -H. Pao,S. -K. Yip
Physics , 2006, DOI: 10.1103/PhysRevB.74.224504
Abstract: We study the pairing between Fermions of different masses, especially at the unitary limit. At equal populations, the thermodynamic properties are identical with the equal mass case provided an appropriate rescaling is made. At unequal populations, for sufficiently light majority species, the system does not phase separate. For sufficiently heavy majority species, the phase separated normal phase have a density larger than that of the superfluid. For atoms in harmonic traps, the density profiles for unequal mass Fermions can be drastically different from their equal-mass counterparts.
Phase diagram of a dilute fermion gas with density imbalance
C. -H. Pao,S. -T. Wu,S. -K. Yip
Physics , 2006, DOI: 10.1016/j.physc.2007.04.192
Abstract: We map out the phase diagram of a dilute two-component atomic fermion gas with unequal populations and masses under a Feshbach resonance. As in the case of equal masses, no uniform phase is stable for an intermediate coupling regime. For majority component heavier, the unstable region moves towards the BEC side. When the coupling strength is increased from the normal phase, there is an increased parameter space where the transition is into the FFLO state. The converse is true if the majority is light.
The Phase Diagrams of F=2 Spinor Bose Condensates
C. V. Ciobanu,S. K. Yip,T. L. Ho
Physics , 1999, DOI: 10.1103/PhysRevA.61.033607
Abstract: We show that there are three possible phases for a spin-2 spinor Bose condensate, one more compared to the spin-1 case. The order parameters of these phases are the spontaneous magnetization and the singlet pair amplitude. Current estimates of scattering lengths show that all three phases have realizations in optically trapped alkali atoms. There is also a one-to-one correspondence between the structure of a spin-2 spinor Bose condensate and that of a d-wave BCS superfluid.
Reply to Comment on "Superfluid stability in the BEC-BCS crossover" by Sheehy and Radzihovsky
C. -H. Pao,S. -T. Wu,S. -K. Yip
Physics , 2006,
Abstract: The reason behind the discrepancy between the phase diagrams of our earlier work [1] and the comment of Sheehy and Radzihovsky [2] is discussed. We show that, in contrast to what is claimed in [2], the requirement of positive susceptibility is sufficient to rule out states that are local maximum of the free energy (as a function of the order parameter $\Delta$
Attempt Suicide by Inserting a Ball-Pen into the Brain: A Case Report  [PDF]
Chi-Man Yip
Surgical Science (SS) , 2012, DOI: 10.4236/ss.2012.34040
Abstract: Purpose: Closed head injuries are more common than penetrating head injuries in our clinical practices. Penetrating head injuries can be happened in industrial accidents, car accidents, fall accidents or criminal activities, also they can be occurred in self-inflicted injuries. We reported a case of self-inflicted penetrating head injury to highlight the importance of suicide precaution and review the principle of management of penetrating head injury. Methods and Results: A 58 year-old woman, who has hypertension and major depression, attempted suicide by inserting a ball-pen into her brain through the right temple in the psychiatric ward. CT of brain showed a foreign body penetrating through the right sphenoid ridge to intracranial right frontal-temporal junction, right parasella and suprasella cistern to interpeduncular cistern and acute subarachnoid hemorrhage in the basal cistern and right sylvian fissure. She underwent an emergent neurosurgical procedure to remove the ball-pen, to evacuate the intracranial hematoma and to repair the lacerated dura. She recovered gradually and was clear after surgery, but a right oculomotor palsy and very mild left hemiparesis were left. Discussion: We learn a lesson from this patient, even a ball-pen can become a weapon in the hands of depression patients. All clinicians should be aware of the psychological condition of each patient and suicide precaution should be kept in mind in clinical practice.
Some Important Characteristics of Asset Bubbles and Financial Crises  [PDF]
Paul S. L. Yip
Modern Economy (ME) , 2018, DOI: 10.4236/me.2018.97075
Abstract: This paper first discusses the major characteristics of the seeding stage, the development stage and the final stage of an asset bubble. In particular, it emphasizes the role of expectation, some major changes in economic behaviors, financial leveraging, some important vicious cycles, upward spirals and herding behavior in the eventual development of an asset bubble. Thereafter, it discusses the policy implications of such an analysis. The second half of the paper extends the discussion to some important changes in economic behaviors, financial deleveraging, vicious cycles and downward spirals that would push an early-developed financial crisis into a full-blown economic crisis. Based on the characteristics and the experience of some major financial crises in the past few decades, the paper discusses policy measures that could be adopted during the crisis period and the post-crisis recession.
The stabilizing role of itinerant ferromagnetism in inter-granular cohesion in iron
D. Yesilleten,M. Nastar,T. A. Arias,A. T. Paxton,S. Yip
Physics , 1998, DOI: 10.1103/PhysRevLett.81.2998
Abstract: We present a simple, general energy functional for ferromagnetic materials based upon a local spin density extension to the Stoner theory of itinerant ferromagnetism. The functional reproduces well available ab initio results and experimental interfacial energies for grain boundaries in iron. The model shows that inter-granular cohesion along symmetric tilt boundaries in iron is dependent upon strong magnetic structure at the interface, illuminates the mechanisms underlying this structure, and provides a simple explanation for relaxation of the atomic structure at these boundaries.
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