Logo American Journal of Case Reports

Call: 1.631.629.4328
Mon-Fri 10 am - 2 pm EST

Contact Us

Logo American Journal of Case Reports Logo American Journal of Case Reports Logo American Journal of Case Reports

: Case report  Japan

[In Press] Hypoprothrombinemia During Cefmetazole Treatment: A Case Report

Unusual clinical course, Challenging differential diagnosis, Unusual or unexpected effect of treatment, Diagnostic / therapeutic accidents, Adverse events of drug therapy , Educational Purpose (only if useful for a systematic review or synthesis)

Yuichiro Haba1ABCDEF, Hikaru Akizuki2ABCDEF, Naoyuki Hashiguchi2ADEF, Toshio Naito ORCID logo1ADEF

Am J Case Rep In Press; DOI:   :: ID: 936712

Available online: , In Press, Corrected Proof

Publication in the "In-Press" formula aims at speeding up the public availability of the pending manuscript while waiting for the final publication. The assigned DOI number is active and citable. The availability of the article in the Medline, PubMed and PMC databases as well as Web of Science will be obtained after the final publication according to the journal schedule


Cefmetazole (CMZ), containing an N-methyl-tetrazole-thiol (NMTT) side chain, is a therapeutic option for diverticulitis in Japan. Cephems containing an NMTT, a methyl-thiadiazol, and a thiadiazolethiol side chain are known to induce coagulation disorders.
A 76-year-old woman developed hypoprothrombinemia after receiving oral levofloxacin (LVFX) 250 mg q24h for 2 days followed by intravenous CMZ 2 g q8h for sigmoid diverticulitis. On day 5 of CMZ administration (after 12 doses in total), black stool was observed. On the following day (after 14 doses), prothrombin time (PT) prolongation was noted; PT and international normalized ratio (INR) were 37.1 s and 2.47, respectively. We diagnosed the patient with hypoprothrombinemia because of vitamin K deficiency caused by markedly elevated protein levels induced by vitamin K absence or antagonist-II on day 6 of CMZ administration. Intravenous vitamin K administration and CMZ cessation rapidly restored PT and led to the disappearance of black stool.
The causes of vitamin K deficiency were considered to be an impaired vitamin K cycle due to CMZ and decreased vitamin K intake because of malnutrition. These findings are consistent with CMZ’s reported adverse effects. Decreased vitamin K production due to alterations in the gut bacterial flora by LVFX and CMZ was also postulated as a cause. If a bleeding tendency is noted during diverticulitis treatment with NMTT-containing cephems, switching to intravenous quinolones or carbapenems is recommended. It remains unclear how this reaction can be avoided; however, prudent monitoring of bleeding signs and PT-INR is recommended.

Keywords: Cefmetazole; Hypoprothrombinemias; Malnutrition; Vitamin K


16 June 2022 : Case report  Ecuador

Multidrug-Resistant Klebsiella pneumoniae in a Patient with SARS-Cov-2 Pneumonia in an Intensive Care Unit ...

Am J Case Rep In Press; DOI: 10.12659/AJCR.936498  

13 June 2022 : Case report  Japan

Stenotrophomonas maltophilia Infection Associated with COVID-19: A Case Series and Literature Review

Am J Case Rep In Press; DOI: 10.12659/AJCR.936889  

13 June 2022 : Case report  Saudi Arabia

Atlantoaxial Subluxation Secondary to SARS-CoV-2 Infection: A Rare Orthopedic Complication from COVID-19

Am J Case Rep In Press; DOI: 10.12659/AJCR.936128  

03 June 2022 : Case report  Japan

Clinical Outcomes of Sotrovimab Treatment in 10 High-Risk Patients with Mild COVID-19: A Case Series

Am J Case Rep In Press; DOI: 10.12659/AJCR.936832  

In Press

24 Jun 2022 : Case report  USA

A 24-Year-Old Man Presenting with Lung Metastases from a Primary Retroperitoneal Extragonadal Choriocarcinoma

Am J Case Rep In Press; DOI: 10.12659/AJCR.936288  

24 Jun 2022 : Case report  Romania

Odontogenic Keratocyst: The Dos and Don’ts in a Clinical Case Scenario

Am J Case Rep In Press; DOI: 10.12659/AJCR.936641  

24 Jun 2022 : Case report  Saudi Arabia

Management of Patients with Alagille Syndrome Undergoing Living Donor Liver Transplantation: A Report of 2 ...

Am J Case Rep In Press; DOI: 10.12659/AJCR.936513  

22 Jun 2022 : Case report  USA

A Case of Lymphomatoid Granulomatosis in a Lymph Node with Unique Clinical and Histopathologic Features

Am J Case Rep In Press; DOI: 10.12659/AJCR.936862  

Most Viewed Current Articles

23 Feb 2022 : Case report  USA

Penile Necrosis Associated with Local Intravenous Injection of Cocaine

DOI :10.12659/AJCR.935250

Am J Case Rep 2022; 23:e935250

17 Feb 2022 : Case report  Oman

Myocarditis, Pulmonary Hemorrhage, and Extensive Myositis with Rhabdomyolysis 12 Days After First Dose of P...

DOI :10.12659/AJCR.934399

Am J Case Rep 2022; 23:e934399

06 Dec 2021 : Case report  Brazil

Lipedema Can Be Treated Non-Surgically: A Report of 5 Cases

DOI :10.12659/AJCR.934406

Am J Case Rep 2021; 22:e934406

09 Feb 2022 : Case report  Saudi Arabia

Extensive Cerebral Venous Sinus Thrombosis (CVST) After the First Dose of Pfizer-BioNTech BNT162b2 mRNA COV...

DOI :10.12659/AJCR.934744

Am J Case Rep 2022; 23:e934744

Your Privacy

We use cookies to ensure the functionality of our website, to personalize content and advertising, to provide social media features, and to analyze our traffic. If you allow us to do so, we also inform our social media, advertising and analysis partners about your use of our website, You can decise for yourself which categories you you want to deny or allow. Please note that based on your settings not all functionalities of the site are available. View our privacy policy.

American Journal of Case Reports eISSN: 1941-5923
American Journal of Case Reports eISSN: 1941-5923