Book excerpt: Prepared by residents and attending physicians at Massachusetts General Hospital, this pocket-sized looseleaf is one of the best-selling references for medical students, interns, and residents on the wards and candidates reviewing for internal medicine board exams. In bulleted lists, tables, and algorithms, Pocket Medicine provides key clinical information about common problems in internal medicine, cardiology, pulmonary medicine, gastroenterology, nephrology, hematology-oncology, infectious diseases, endocrinology, and rheumatology. This Fifth Edition is fully updated and includes a sixteen-page color insert with key and classic abnormal images. If you purchased a copy of Sabatine: Pocket Medicine 5e, ISBN 978-1-4511-8237-8, please make note of the following important correction on page 1-36: Oral anticoagulation ( Chest 2012;141: e531S; EHJ 2012;33:2719; Circ 2013;127:1916)- All valvular AF as stroke risk very high- Nonvalv. AF: stroke risk 4.5%/y; anticoag (R) 68% ̄ stroke; use a risk score to guide Rx: CHADS2: CHF (1 point), HTN (1), A ge >= 75 y (1), DM (1), prior Stroke/TIA (2)CHA2DS2-VASc: adds 65-74 y (1) >=75 y (2), vasc dis. [MI, Ao plaque, or PAD (1)]; ? (1)score 32 (R) anticoag; score 1 (R) consider anticoag or ASA (? latter reasonable if risk factor age 65-74 y, vasc dis. or ?); antithrombotic Rx even if rhythm control [SCORE CORRECTED]- Rx options: factor Xa or direct thrombin inhib (non-valv only; no monitoring required) or warfarin (INR 2-3; w/ UFH bridge if high risk of stroke); if Pt refuses anticoag, considerASA + clopi or, even less effective, ASA alone ( NEJM 2009;360:2066)Please make note of this correction in your copy of Sabatine: Pocket Medicine 5e immediately and contact LWW's Customer Service Department at 1.800.638.3030 or 1.301.223.2300 so that you may be issued a corrected page 1-36. You may also download a PDF of page 1-36 by clicking HERE. All copies of Pocket Medicine, 5e with the ISBN: 978-1-4511-9378-7 include this correction.