Cardiac muscle serves many necessary functions, leading to a specific structure that serves these functions. The structure highlighted is an important histology component of cardiac muscle. What would be the outcome if this structure diffusely failed to function?
AFailure of potassium channels to appropriately open to repolarize the cell
BFailure of propagation of the action potential from the conduction system
CIneffective excitation-contraction coupling due to insufficient calcium ions
DInappropriate formation of cardiac valve leaflets
EOutflow tract obstruction
On the 3rd day post-anteroseptal myocardial infarction (MI), a 55-year-old man who was admitted to the intensive care unit is undergoing an examination by his physician. The patient complains of new-onset precordial pain which radiates to the trapezius ridge. The nurse informs the physician that his temperature was 37.7°C (99.9°F) 2 hours ago. On physical examination, the vital signs are stable, but the physician notes the presence of a triphasic pericardial friction rub on auscultation. A bedside electrocardiogram shows persistent positive T waves in leads V1–V3 and an ST segment: T wave ratio of 0.27 in lead V6. Which of the following is the drug of choice to treat the condition the patient has developed?
AClarithromycin
BAspirin
CFurosemide
DColchicine
EPrednisolone
A 16-year-old boy with a history of severe, persistent asthma presents to the emergency department with severe shortness of breath and cough. He states that he was outside playing basketball with his friends, forgot to take his inhaler, and began to have severe difficulty breathing. On exam, he is in clear respiratory distress with decreased air movement throughout all lung fields. He is immediately treated with beta-agonists which markedly improve his symptoms. Prior to treatment, which of the following was most likely observed in this patient?
AKussmaul's sign
BPulsus paradoxus
CFriction rub
DInspiratory stridor
EIncreased breath sounds
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