7 questions match your search.
The lungs of a 7-kg infant are being ventilated with a volume-cycled ventilator at a rate of 20/min. The anesthetic circuit has a compressible volume of 5 ml/cm H2O, and the peak inspiratory pressure is 20 cmH2O. To achieve adequate ventilation, the ventilator tidal volume should be set at
- (A) 50 ml
- (B) 125 ml
- (C) 175 ml
- (D) 225 ml
- (E) 300 ml
Each of the following structures may participate in causing acute bradycardia during strabismus surgery EXCEPT the
- (A) globe
- (B) rectus muscles
- (C) optic nerve
- (D) trigeminal nerve
- (E) vagus nerve
A 35-kg child requires mechanical ventilation with pure oxygen at a tidal volume of 350 ml and a rate of 20/min during a severe asthma attack. The most likely cause of severe hypotension after initiating mechanical ventilation is
- (A) hypoxic circulatory depression
- (B) inadequate expiratory time
- (C) increased pulmonary vascular resistance
- (D) respiratory alkalosis
- (E) tension pneumothorax
The capnographic tracing is from a 2-month-old infant anesthetized using a pediatric circle system and mask at a fresh gas flow of 4 L/min. The sampling port is in the elbow connector. This tracing indicates
- (A) adequate alveolar ventilation
- (B) exhausted soda lime
- (C) expired halothane concentrations representative of alveolar concentrations
- (D) mixing of inspired and expired gases
- (E) the need to change to a Mapleson D circuit
A 16-year-old girl is receiving isoflurane, nitrous oxide, oxygen, and pancuronium for insertion of a Harrington rod. In order to perform a "wake-up test" the muscle relaxant was antagonized with neostigmine 2.5 mg and atropine 1 mg. The patient abruptly moved all extremities and was given thiopental 100 mg and succinylcholine 100 mg rapidly. Forty-five minutes later no twitch could be elicited with a nerve stimulator. The most likely explanation is
- (A) a dibucaine number of 20
- (B) incomplete antagonism of pancuronium
- (C) prolongation of the action of succinylcholine by neostigmine
- (D) spinal cord damage caused by the abrupt arousal
- (E) synergism between succinylcholine and pancuronium
Which of the following is the most likely effect of intramuscular ketamine used for induction of anesthesia in a 2-year-old child undergoing elective surgery?
- (A) Bronchoconstriction
- (B) Decreased heart rate
- (C) Decreased intracranial pressure
- (D) Increased salivation
- (E) Respiratory depression
A 27-month-old, 14-kg infant with intestinal obstruction is anesthetized with nitrous oxide at 1 L/min, oxygen at 0.4 L/min, and halothane at 0.8% using a Bain circuit. Ventilation is controlled at a rate of 30/min. The child's temperature is 39°C, and the PaCO2 is 65 mmHg. Which of the following is most likely?
- (A) Malignant hyperthermia
- (B) Low gas inflow rate
- (C) Low respiratory rate
- (D) Pulmonary aspiration of gastric contents
- (E) Inaccurate flowmeters