,FIRST AID ™
Q&A FOR THE
USMLE
STEP 2 CK
Second Edition
SENIOR EDITORS EDITORS
TAO LE, MD, MHS HERMAN SINGH BAGGA, MD
Assistant Clinical Professor Resident
Chief, Section of Allergy and Clinical Immunology Department of Urology
Department of Medicine University of California, San Francisco Medical Center
University of Louisville
THOMAS L.H. HOCKER, MD
KRISTEN VIERREGGER, MD Resident
Resident Department of Dermatology
Department of Pathology Mayo Clinic
University of California, Irvine Medical Center
CHRISTOPHER R. KINSELLA, JR., MD
Research Fellow
University of Pittsburgh Medical Center
MATTHEW O'ROURKE, MD
Resident
Morgan Stanley Children's Hospital of New York–
Presbyterian
Columbia University Medical Center
JOHN RHYNER, MD
Resident
Department of Internal Medicine
University of Michigan Medical Center
SADE CLARKE UDOETUK, MD
Resident
Department of Psychiatry
Baylor College of Medicine
New York / Chicago / San Francisco / Lisbon / London / Madrid / Mexico City
Milan / New Delhi / San Juan / Seoul / Singapore / Sydney / Toronto
,Copyright © 2010, 2008 by Tao Le. All rights reserved. Except as permitted under the United States Copyright Act of 1976, no part of this publication may be repro-
duced or distributed in any form or by any means, or stored in a database or retrieval system, without the prior written permission of the publisher.
ISBN: 978-0-07-162930-0
MHID: 0-07-162930-0
The material in this eBook also appears in the print version of this title: ISBN: 978-0-07-162571-5, MHID: 0-07-162571-2.
All trademarks are trademarks of their respective owners. Rather than put a trademark symbol after every occurrence of a trademarked name, we use names in an
editorial fashion only, and to the benefit of the trademark owner, with no intention of infringement of the trademark. Where such designations appear in this book, they
have been printed with initial caps.
McGraw-Hill eBooks are available at special quantity discounts to use as premiums and sales promotions, or for use in corporate training programs. To contact a
representative please e-mail us at .
Medicine is an ever-changing science. As new research and clinical experience broaden our knowledge, changes in treatment and drug therapy are required. The authors
and the publisher of this work have checked with sources believed to be reliable in their efforts to provide information that is complete and generally in accord with the
standards accepted at the time of publication. However, in view of the possibility of human error or changes in medical sciences, neither the authors nor the publisher nor
any other party who has been involved in the preparation or publication of this work warrants that the information contained herein is in every respect accurate or
complete, and they disclaim all responsibility for any errors or omissions or for the results obtained from use of the information contained in this work. Readers are
encouraged to confirm the information contained herein with other sources. For example and in particular, readers are advised to check the product information sheet
included in the package of each drug they plan to administer to be certain that the information contained in this work is accurate and that changes have not been made
in the recommended dose or in the contraindications for administration. This recommendation is of particular importance in connection with new or infrequently used
drugs.
TERMS OF USE
This is a copyrighted work and The McGraw-Hill Companies, Inc. (“McGraw-Hill”) and its licensors reserve all rights in and to the work. Use of this work is subject to
these terms. Except as permitted under the Copyright Act of 1976 and the right to store and retrieve one copy of the work, you may not decompile, disassemble, reverse
engineer, reproduce, modify, create derivative works based upon, transmit, distribute, disseminate, sell, publish or sublicense the work or any part of it without McGraw-
Hill’s prior consent. You may use the work for your own noncommercial and personal use; any other use of the work is strictly prohibited. Your right to use the work may
be terminated if you fail to comply with these terms.
THE WORK IS PROVIDED “AS IS.” McGRAW-HILL AND ITS LICENSORS MAKE NO GUARANTEES OR WARRANTIES AS TO THE ACCURACY, ADEQUA-
CY OR COMPLETENESS OF OR RESULTS TO BE OBTAINED FROM USING THE WORK, INCLUDING ANY INFORMATION THAT CAN BE ACCESSED
THROUGH THE WORK VIA HYPERLINK OR OTHERWISE, AND EXPRESSLY DISCLAIM ANY WARRANTY, EXPRESS OR IMPLIED, INCLUDING BUT
NOT LIMITED TO IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. McGraw-Hill and its licensors do not
warrant or guarantee that the functions contained in the work will meet your requirements or that its operation will be uninterrupted or error free. Neither McGraw-Hill
nor its licensors shall be liable to you or anyone else for any inaccuracy, error or omission, regardless of cause, in the work or for any damages resulting therefrom.
McGraw-Hill has no responsibility for the content of any information accessed through the work. Under no circumstances shall McGraw-Hill and/or its licensors be liable
for any indirect, incidental, special, punitive, consequential or similar damages that result from the use of or inability to use the work, even if any of them has been advised
of the possibility of such damages. This limitation of liability shall apply to any claim or cause whatsoever whether such claim or cause arises in contract, tort or
otherwise.
, D E D I C AT I O N
To the contributors to this and future editions, who took time to share their
knowledge, insight, and humor for the benefit of residents and clinicians.
and
To our families, friends, and loved ones, who supported us in the task of
assembling this guide.
Q&A FOR THE
USMLE
STEP 2 CK
Second Edition
SENIOR EDITORS EDITORS
TAO LE, MD, MHS HERMAN SINGH BAGGA, MD
Assistant Clinical Professor Resident
Chief, Section of Allergy and Clinical Immunology Department of Urology
Department of Medicine University of California, San Francisco Medical Center
University of Louisville
THOMAS L.H. HOCKER, MD
KRISTEN VIERREGGER, MD Resident
Resident Department of Dermatology
Department of Pathology Mayo Clinic
University of California, Irvine Medical Center
CHRISTOPHER R. KINSELLA, JR., MD
Research Fellow
University of Pittsburgh Medical Center
MATTHEW O'ROURKE, MD
Resident
Morgan Stanley Children's Hospital of New York–
Presbyterian
Columbia University Medical Center
JOHN RHYNER, MD
Resident
Department of Internal Medicine
University of Michigan Medical Center
SADE CLARKE UDOETUK, MD
Resident
Department of Psychiatry
Baylor College of Medicine
New York / Chicago / San Francisco / Lisbon / London / Madrid / Mexico City
Milan / New Delhi / San Juan / Seoul / Singapore / Sydney / Toronto
,Copyright © 2010, 2008 by Tao Le. All rights reserved. Except as permitted under the United States Copyright Act of 1976, no part of this publication may be repro-
duced or distributed in any form or by any means, or stored in a database or retrieval system, without the prior written permission of the publisher.
ISBN: 978-0-07-162930-0
MHID: 0-07-162930-0
The material in this eBook also appears in the print version of this title: ISBN: 978-0-07-162571-5, MHID: 0-07-162571-2.
All trademarks are trademarks of their respective owners. Rather than put a trademark symbol after every occurrence of a trademarked name, we use names in an
editorial fashion only, and to the benefit of the trademark owner, with no intention of infringement of the trademark. Where such designations appear in this book, they
have been printed with initial caps.
McGraw-Hill eBooks are available at special quantity discounts to use as premiums and sales promotions, or for use in corporate training programs. To contact a
representative please e-mail us at .
Medicine is an ever-changing science. As new research and clinical experience broaden our knowledge, changes in treatment and drug therapy are required. The authors
and the publisher of this work have checked with sources believed to be reliable in their efforts to provide information that is complete and generally in accord with the
standards accepted at the time of publication. However, in view of the possibility of human error or changes in medical sciences, neither the authors nor the publisher nor
any other party who has been involved in the preparation or publication of this work warrants that the information contained herein is in every respect accurate or
complete, and they disclaim all responsibility for any errors or omissions or for the results obtained from use of the information contained in this work. Readers are
encouraged to confirm the information contained herein with other sources. For example and in particular, readers are advised to check the product information sheet
included in the package of each drug they plan to administer to be certain that the information contained in this work is accurate and that changes have not been made
in the recommended dose or in the contraindications for administration. This recommendation is of particular importance in connection with new or infrequently used
drugs.
TERMS OF USE
This is a copyrighted work and The McGraw-Hill Companies, Inc. (“McGraw-Hill”) and its licensors reserve all rights in and to the work. Use of this work is subject to
these terms. Except as permitted under the Copyright Act of 1976 and the right to store and retrieve one copy of the work, you may not decompile, disassemble, reverse
engineer, reproduce, modify, create derivative works based upon, transmit, distribute, disseminate, sell, publish or sublicense the work or any part of it without McGraw-
Hill’s prior consent. You may use the work for your own noncommercial and personal use; any other use of the work is strictly prohibited. Your right to use the work may
be terminated if you fail to comply with these terms.
THE WORK IS PROVIDED “AS IS.” McGRAW-HILL AND ITS LICENSORS MAKE NO GUARANTEES OR WARRANTIES AS TO THE ACCURACY, ADEQUA-
CY OR COMPLETENESS OF OR RESULTS TO BE OBTAINED FROM USING THE WORK, INCLUDING ANY INFORMATION THAT CAN BE ACCESSED
THROUGH THE WORK VIA HYPERLINK OR OTHERWISE, AND EXPRESSLY DISCLAIM ANY WARRANTY, EXPRESS OR IMPLIED, INCLUDING BUT
NOT LIMITED TO IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. McGraw-Hill and its licensors do not
warrant or guarantee that the functions contained in the work will meet your requirements or that its operation will be uninterrupted or error free. Neither McGraw-Hill
nor its licensors shall be liable to you or anyone else for any inaccuracy, error or omission, regardless of cause, in the work or for any damages resulting therefrom.
McGraw-Hill has no responsibility for the content of any information accessed through the work. Under no circumstances shall McGraw-Hill and/or its licensors be liable
for any indirect, incidental, special, punitive, consequential or similar damages that result from the use of or inability to use the work, even if any of them has been advised
of the possibility of such damages. This limitation of liability shall apply to any claim or cause whatsoever whether such claim or cause arises in contract, tort or
otherwise.
, D E D I C AT I O N
To the contributors to this and future editions, who took time to share their
knowledge, insight, and humor for the benefit of residents and clinicians.
and
To our families, friends, and loved ones, who supported us in the task of
assembling this guide.
