Sometimes, clinicians might find ABG result not matching with the patient condition. These results might arise from technical errors in machine and there are certain points which can be used to check the error. How to Check whether ABG result is Right or has Error? X= 24X PaCO2/HCO3 Y= 80-…
Category: PGMEE, MRCS, USMLE, MBBS, MD/MS
Medical knowledge in bullet points with understandable language, simplified images and graspable mnemonics.
PGMEE, MRCS, USMLE, MBBS, MD/MS 
Extremity Amputations – Review
Indications Mnemonic: three Ds 1. Dead (or dying): Peripheral vascular disease (most common indication for amputation), Severe trauma (leading indication for amputation in younger patients), Burns, Frostbite 2. Dangerous (or deadly): Malignant tumors, Potentially lethal sepsis, Crush injury 3. Damned nuisance: Gross deformity, Recurrent sepsis, Sever loss of function Increase…
PGMEE, MRCS, USMLE, MBBS, MD/MS 
Z-effect and Reverse Z-effect in PFN
‘Z-effect’ and ‘Reverse Z-effect’ are complications relating to differential migration of screws that arise from fixation of unstable proximal femoral fractures with Proximal Femoral Nail (PFN) having 2 interlocking head screws. The 4 patterns of unstable intertrochanteric fracture hip are: Z-effect: The Z-effect involves the lateral migration of the lag…
PGMEE, MRCS, USMLE, MBBS, MD/MS 
Pathophysiology of Acute Compartment syndrome
Definition Mubarak and Hargens (1981) defined compartment syndrome as an elevation of the interstitial pressure in a closed osseofascial compartment that results in microvascular compromise. Pathophysiology Tissue perfusion = Capillary perfusion pressure – Interstitial fluid pressure 3 major theories for microvascular dysfunction and ischemia: Tissue survival: Vicious cycle of compartment…
PGMEE, MRCS, USMLE, MBBS, MD/MS 
Dupuytren’s contracture : Mnemonics
Associations of Dupuytren’s Contracture Mnemonic: DEAFEST LIAR Dupuytren’s diathesis Mnemonic: ABCDEF Severity and recurrence risk is increased in: If all 6 diathesis risk factors are present: risk of recurrence is 71% If none of diathesis risk factors are present: risk of recurrence is 23% Involvement of fingers Mnemonic: RaSMIT In…
PGMEE, MRCS, USMLE, MBBS, MD/MS 
Congenital Pseudoarthrosis of Tibia (CPT)
Origin of Pathology Periosteum Clinical features Mnemonic: ABCDeF Boyd Classification Mnemonic: B-2C-2D-E I – Bowing II – Constriction (hourlgass) III – Cyst IV – Dense (Sclerotic) V – Dysplastic fibula VI – “Endosseous” (Intraosseous) neurofibroma or schwannoma Paley Classification Type Bone ends Pseudoarthrosis mobility Previous surgical intervention 1 Atrophic Mobile…
PGMEE, MRCS, USMLE, MBBS, MD/MS 
Triple deformity of Knee : Mnemonic
Triple deformity of knee consists of 3 components: 1. Flexion deformity at knee 2. Posterolateral subluxation of tibia 3. External rotation of tibia over femoral condyle Mechanism behind triple deformity of knee: Causes of Triple deformity of knee: Mnemonic: TRIPLE 1. Tuberculosis (TB) knee – commonest cause 2. Rheumatoid arthritis…
PGMEE, MRCS, USMLE, MBBS, MD/MS 
Meniscus Injury : Mnemonics
Meniscus structure Mnemonic: CD RS McMurray test Mnemonic: The heel of the foot points towards the injured meniscus Meniscus attachments in knee Each meniscus has something attached to it: Tear Patterns Mnemonic: LaHORe FC Tear pattern Description Potential to repair Longitudinal Oriented parallel to edge of meniscusa. Complete tear with…