Medical Notes Dr. Ayman Radwan

HAP in a nut shell , high quality medicine approach episode one (meropenem resistance ,tips and tricks) ........... 1-empirical antibiotic : you have to cover MRSA and psuedomonas in most patients use vancomycin for MRSA use anti pseudomonal (piperacillin/tazobactam , ceftazidime or carbapenem ) for…

Certain antibiotics are never used to treat urinary tract infections (UTIs)-even if a lab test says the bacteria is sensitive-because they do not achieve high enough concentrations in the urine to clear the infection including (1)Moxifloxacin : Unlike other fluoroquinolones (like ciprofloxacin or …

well trained microbiologist knows that morphology trumps millimeters , it is never zone of inhibition alone ............. we discussed in details earlier thethe in vitro vs. in vivo discordance , when the culture result does not tell the whole story followed by the (heterogenous VISA) ,when the cult…

You cannot place a Cefoxitin disk directly onto a primary clinical specimen (like raw pus, tissue biopsies, or ear drainage). The assay requires isolating a pure bacterial colony from a mature culture, standardizing its turbidity, and incubating it for an additional 18–24 hours. Consequently, it wil…

Advanced level According to the ATS/IDSA Guidelines for CAP, empiric regimens must cover Streptococcus pneumoniae, Haemophilus influenzae, and atypical pathogens (Mycoplasma pneumoniae, Chlamydophila pneumoniae, Legionella pneumophila). While Cefazolin has lower minimum inhibitory concentrations (MI…

Staph aureus in a nut shell it is gram positive cocci , facultative anaerobe organism 1- facultative anaerobe = can grow in areobic or anerobic media then it can cause pneumonia or deep abscess regardless the oxygen 2-coagulase positive its virulence in deep abscesses is not merely due to surviving …

overlooked blind spot ............. For patients colonized with MRSA (positive screening for pre surgical patient but no active clinical MRSA infection) decolonization bundles generally include: 1-Nasal Ointment: Mupirocin (2%) applied twice daily for 5 days. 2-Body Wash: Daily use of antiseptic was…

As a common skin commensal, S. aureus can be a cause of pseudo-bacteremia(contamination) as well as true bacteremia. contamination will be tyoically seen either (1)Single Positive Bottle: Only one of multiple drawn culture bottles yields S. aureus. (2) Mixed Flora: The presence of other typical skin…

The "Escape Phenomenon" that is frequently seen in staph aureus bactremia where a patient appears to have achieved microbiological cure (blood cultures turn negative) but then relapses or clinically deteriorates was previously not fully explained now it is almost certainly the intracellular nich…

Golden diagnostic rule "the expert level" (1) if the primary tissue site won't clear unlike the bacteremia , look for a micro-niche interaction (eg lung abscess) (2) If the primary tissue site is resolving but the blood remains persistently positive for MRSA, look for a distal macro-systemic inte…

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Fast bullets on Delafloxacin ........................ 1-Delafloxacin ( Baxdela) is a unique fluoroquinolone with activity against MRSA 2-it has excellent Phase III data for ABSSSI (Skin and Soft Tissue Infections) and CABP . It does not have extensive, validated data in the high-inoculum, high-mor…

لكن نختم بدراسة نشرت من أقل من أسبوع Annemijn S.J.C. Oosterlee et al march 2026 الدراسة اعتمدت على ملاحظات المرضى عن نوبات صداعهم لمدة 28 قبل التجربة باعتبارها نقطة الأساس للمقارنة -العلاج الفعال ما يقلل النوبات بمقدار النصف - candesartan(4-32) Vs topiramate(25-100) عدد المرضى فى التجربة كان كالاتي …

Overview and updates in migraine ............. for preventive treatment of migraine AAN/AHS recommeded (level A recommendation): 1-Antiepileptic drugs : divalproex sodium, sodium valproate, topiramate 2-β-Blockers: metoprolol, propranolol 3-Triptans: frovatriptan for short-term MAMs prevention leve…

Woltman Sign in Hypothyroidism, delayed "slow"relaxation phase of ankle reflex . it is not typically hyporeflexia While not sensitive enough to be a primary screening tool over blood tests, it is a valuable, specific indicator for overt hypothyroid patients, often resolving with treatment "sensitiv…

Carbamazepine, via its enzyme-inducing effect on CYP3A4 may interfere with low-dose dexamethasone suppression test leading to false-positive results for Cushing syndrome NB: midnight salivary cortisol is not altered by carbamazepine while serum cortisol may be falsely elevated "affected by chan…