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shock mbbs general surgery ulcer surgery lecture parkland formula bailey burn hypovolumic cardiogenic neurogenic septic anaphylatic endocrine distributive wound healing metabolic response to injury trauma metabolic response sinus fistula classification various career pathway for mbbs students foundati pathway career ias ips md ms upsc organ donation organization transplantation chest tumour lymphoma chest truma chylothorax pleural effusion pneumothorax bleeding antibiotics prophylaxis infections surgical infections ssi live love\ rule of nine browe and lund chart chemicsl\ electrical flame acid alkali management silver sulphadiazene cardiogenic shock non healing ulcer history examination wounds abrasion bruise contusion laceration incised stab wound mild moderate severe decomenstated shock blood transfusion haemorrhage dressing