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Asthma is triggered by viral upper respiratory, infection, exposure to allergens, cold, or exercise., , Dyspneic, speaks in, words, , Agitated patient, , Heart rate > 120 /min,, tachycardia, , Pulsus paradoxus, present, , Accessory muscles of, respiration used, , Loud wheeze throughout, the respiration, , Peak expiratory flow rate, < 40 ml/min, , Respiratory alkalosis, , Hyperventilation leading, to low or normal PaCO2, , , , Mute patient, Silent / confused, Relative bradycardia, , Pulsus paradoxus, absent (due to, respiratory muscle, fatigue), , Paradoxical breathing, is seen, , Silent chest, , Peak expiratory flow, rate < 25 ml/min, , Respiratory acidosis, , Normal or rising PaCO2