This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General surgery, Subject name: Surgery
[{'content': 'Modified shock index formula is: \nSelect and explain. \nA. Hea rate/Systolic BP, B. Hea rate/Diastolic BP, C. Hea rate/Mean aerial pressure, D. Pulse rate/Systolic BP', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Shock Index(SI) Modified Shock Index (MSI) SI is defined as hea rate divided by systolic BP Better marker for assessing severity of shock than hea rate & BP alone. Utility in trauma patients , sepsis, obstetrics, myocardial infarction, stroke & other acute critical illnesses. Correlated with need for interventions such as blood transfusion & invasive procedures including operations SI is known as a hemodynamic stability indicator Si does not take into account the diastolic BP MSI is defined as hea rate divided by mean aerial pressure High MSI indicates a value of stroke volume & low systemic vascular resistance, a sign of hypodynamic circulation Low MSI indicates a hyperdynamic state. MSI has been considered a better marker than SI for moality rate prediction. Ref: Sabiston 20th edition Pgno: 52', 'role': 'assistant'}]