text: ECG in<unk> tics with acute severe exacerbation may reveal sinus tachycardia and a right heart strain pattern. However, the administration of a β2-agonist may relieve symptoms and hence result in a paradoxical decrease in heart rate. The presence of supraventricular tachycardia should raise a suspicion of theophylline toxicity.
option_0: Asthma electrocardiogram
option_1: Chronic bronchitis electrocardiogram
option_2: Status asthmaticus electrocardiogram
option_3: Air embolism electrocardiogram
option_4: Asthma chest x ray
option_5: Cough electrocardiogram
option_6: Chronic obstructive pulmonary disease electrocardiogram
option_7: Sleep apnea echocardiography or ultrasound