This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Medicine
[{'content': 'Clinical finding in AV fistula is one of the following: \nSelect and explain. \nA. Pericarditis, B. Sinus tachycardia, C. Cardiac arrhythmia, D. Hypothermia', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Answer is B (Sinus tachycardia) AV fistulas cause sho circuiting of blood from an aery to a vein thereby increasing the pulse rate (sinus tachycardia) & cardiac output. Sinus tachycardia : It is a regular rhythm with SA node discharging in excess of 100 times/ minute (usually 100-160/min) Common causes include: Physiological high igh altitude Exercise Excitement Pregnancy Pain Pathological Thyrotoxicosis Anxiety states Fever and infections Cardiac failure Pulmonary embolism AV fistulae.', 'role': 'assistant'}]