Let Y be a closed oriented three-manifold and K be a framed knot in Y . For a rational number r , let Yr(K) be the resulting manifold obtained by Dehn surgery along K with slope r with respect to the given framing. For a knot K in S3 , we will always use the Seifert framing. Two surgeries along K with distinct slopes r and s are called cosmetic if Yr(K) and Ys(K) are homeomorphic. The two surge...

INTRODUCTION Destructive ocular surgery (DOS) means eye loss. An audit of its indications would be useful in reducing its incidence. OBJECTIVE To determine indications for destructive ocular surgeries. MATERIALS AND METHODS The case records (files) of all the patients who had DOS in a tertiary health facility in Nigeria from January 2004 to December 2011 were reviewed retrospectively. The i...

case 1 A 30‐year‐old male patient presented with ankylosing spondylitis and kyphosis for posterior ostomy, correction, and internal fixation. Physical examination showed fixed extension deformity of the neck with no movement, restricted mouth opening with Mallampati Grade III. The patient could not lie flat and denied snoring at night. Difficult laryngoscopy was anticipated due to stiffness of ...

We use Seiberg-Witten monopoles and Ozsváth-Szabó invariants to distinguish between tight contact structures obtained by Legendrian surgeries on stabilized Legendrian links in tight contact 3-manifolds.

It is proved that every knot in the major subfamilies of J. Berge’s lens space surgery (i.e., knots yielding a lens space by Dehn surgery) is presented by an L-shaped (real) plane curve as a divide knot defined by N. A’Campo in the context of singularity theory of complex curves. For each knot given by Berge’s parameters, the corresponding plane curve is constructed. The surgery coefficients ar...

We show that if a surgery on a knot in a product sutured manifold yields the same product sutured manifold, then this knot is a 0or 1-crossing knot. The proof uses techniques from sutured manifold theory.

BACKGROUND The Adult Cardiac Surgery Databank (ACSD) of Tehran Heart Center was established in 2002 with a view to providing clinical prediction rules for outcomes of cardiac procedures, developing risk score systems, and devising clinical guidelines. This is a general analysis of the collected data. METHODS All the patients referred to Tehran Heart Center for any kind of heart surgery betwee...

UNLABELLED Due to recorded growth both in living standards and latest researches in medicine, proportion of people in old age has significantly improved all over the world. Although old age people are several percent of the entire society, number of surgeries within the group does not exceed 40%. Also risk of malignant neoplasms among old age people, significantly grows. Malignant neoplasm of c...

We will determine whether a given surgery on a 2-bridge knot is reducible, toroidal, Seifert bered, or hyperbolic. In [Th1] Thurston showed that if K is a hyperbolic knot, then all but nitely many surgeries on K are hyperbolic. In particular, for the Figure 8 knot, it was shown that exactly 9 nontrivial surgeries are non-hyperbolic. Let Kp=q be a 2-bridge knot associated to the rational number ...