“CRNA” Study Guide: All-In-One Guide + 4 Exam Practice Test (2200 Questions), Latest for “Certified Registered Nurse Anesthetist (CRNA)”, “National (NBCRNA)”

A patient undergoing a long orthopedic procedure is currently ventilated using synchronized intermittent mandatory ventilation with pressure support. As the patient begins to emerge and trigger spontaneous breaths, the CRNA notes a decrease in the exhaled tidal volume of the spontaneous breaths. Which modification best addresses the increased work of breathing?

You are using a high-flow face mask that utilizes a narrowed orifice to deliver a precise fraction of inspired oxygen to a patient in respiratory distress. As the oxygen passes through the narrow constriction, what occurs to the lateral pressure and velocity of the gas?

A patient with a small, untreated pneumothorax requires an emergent exploratory laparotomy. You choose to avoid a specific gaseous anesthetic agent that is significantly more soluble in blood than nitrogen. Which physical principle explains why this gas would cause the pneumothorax to expand rapidly?

An oxygen cylinder is moved from an unheated outdoor storage area at 0 degrees Celsius into an operating room maintained at 20 degrees Celsius. If the volume of the cylinder is constant, which statement describes the behavior of the internal pressure according to Gay-Lussac’s Law?

A patient undergoing a deep hypothermic circulatory arrest procedure is cooled to a core temperature of 18 degrees Celsius. As the body temperature decreases, how does the solubility of anesthetic gases in the blood change according to the principles of Henry’s Law?

During a thoracotomy for a patient with severe emphysema, you observe large, thin-walled blebs on the lung surface. Based on the Law of Laplace as applied to a sphere, how does the wall tension of a larger bleb compare to a smaller bleb if the internal pressure remains constant?

A patient in the trauma bay requires rapid volume expansion for hemorrhagic shock after a motor vehicle accident. You have a 20-gauge peripheral intravenous line in the hand and a 14-gauge peripheral line in the antecubital fossa. According to the Hagen-Poiseuille law, which modification provides the most significant increase in the flow rate of crystalloid?

A patient is placed in the lithotomy position for a four-hour gynecological procedure using candy-cane stirrups. Upon awakening, the patient exhibits “foot drop” and is unable to dorsiflex the foot. Which nerve was most likely injured by the positioning equipment?

During a posterior fossa craniotomy in the sitting position, the anesthesia provider notes a sudden, sharp decrease in end-tidal carbon dioxide and a new “mill-wheel” murmur heard via esophageal stethoscope. What is the most immediate physiological consequence of this event?

A patient is positioned prone on a Wilson frame for a lumbar laminectomy. Shortly after positioning, the anesthesia provider observes a decrease in mean arterial pressure and a reduction in the stroke volume index. Which physiological mechanism is the most likely cause of these hemodynamic changes?

A 55-year-old male with a body mass index of 34 kg/m² is undergoing an abdominal procedure in the supine position with his arms tucked at his sides. On postoperative day one, he complains of numbness and tingling in his fifth digit and the medial aspect of his fourth digit. What is the most likely mechanism for this nerve injury?

An anesthetized and paralyzed patient is placed in the right lateral decubitus position for a left-sided thoracotomy. The anesthesia provider must manage the physiological consequences of this position regarding ventilation and perfusion. Which statement best describes the distribution of ventilation and perfusion in this specific clinical scenario?

A 65-year-old male with a history of chronic obstructive pulmonary disease is undergoing a robotic-assisted prostatectomy in the steep Trendelenburg position with pneumoperitoneum. After two hours of surgery, the anesthesia provider notes a significant increase in peak inspiratory pressures and a decrease in oxygen saturation. Which physiological change most likely accounts for these respiratory findings?

A CRNA is using a supraglottic airway for a brief gynecological procedure. During the maintenance phase, the patient begins to cough, and the anesthesia machine displays a “low tidal volume” alarm due to a significant leak around the device. Which ventilator adjustment is most effective for maintaining ventilation while minimizing gastric insufflation?

During a general anesthetic, the central oxygen supply fails, and the anesthesia machine alarm sounds. The CRNA observes that the flow of nitrous oxide has stopped entirely, even though the nitrous oxide pipeline pressure remains at 50 psi. Which component of the anesthesia machine is responsible for this specific safety action?

A 54-year-old male with a history of ankylosing spondylitis and limited cervical spine mobility is undergoing an elective ventral hernia repair. After an uneventful induction, direct laryngoscopy reveals a Cormack-Lehane Grade IV view despite optimal external laryngeal manipulation. Mask ventilation remains easy with an oral airway, and oxygen saturation is stable at 99%. Which action is most appropriate to manage the airway at this stage?

While preparing for a case in a remote anesthetizing location, a CRNA attempts to attach a backup oxygen cylinder to the anesthesia machine. The cylinder yoke prevents the attachment of a nitrous oxide tank to the oxygen port. This specific safety feature is primarily designed to prevent which error?

During a robotic-assisted laparoscopic prostatectomy, a patient in steep Trendelenburg position with a 15 mmHg pneumoperitoneum exhibits peak inspiratory pressures of 42 cm H2O while on volume-controlled ventilation. To optimize gas exchange and reduce the risk of barotrauma, which adjustment is most appropriate?

A CRNA is managing an anesthetic using a traditional pneumatic-link proportioning system. During the case, a sudden drop in the oxygen pipeline pressure occurs while the nitrous oxide flow is set to 4 L/min. Which mechanical response best describes the safety mechanism’s action to prevent a hypoxic mixture?

A patient with severe tricuspid regurgitation requires cardiac output monitoring using the thermodilution method. The clinician should anticipate that this valvular pathology will have which effect on the cardiac output measurement?

While monitoring a patient with a pulmonary artery catheter, the clinician notes that the pulmonary artery pressure waveform suddenly changes from a pulsatile pattern to a low-amplitude, undulating waveform with a mean pressure of 22 mmHg. The balloon is currently deflated. Which of the following is the most appropriate interpretation of this change?

A patient with restrictive cardiomyopathy is undergoing a procedure with a pulmonary artery catheter in place. The clinician observes a CVP waveform characterized by a steep x and y descent, giving the waveform a distinct “M” or “W” shape. This pattern is most consistent with which of the following clinical conditions?

During a thoracic procedure, the radial arterial line waveform appears narrowed with a slurred upstroke and a loss of the dicrotic notch. A fast-flush test reveals a single oscillation before returning to the baseline. Which of the following factors is the most likely cause of this specific hemodynamic monitoring interference?

A patient with chronic atrial fibrillation and a history of tricuspid valve repair is monitored with a central venous pressure (CVP) catheter during a major vascular procedure. Upon inspecting the CVP waveform, the clinician notes the absence of the a-wave and a prominent c-wave. Which physiological event explains these specific findings?

A patient with a history of severe mitral regurgitation is undergoing an urgent exploratory laparotomy. During the procedure, the anesthesia provider notes that the pulmonary artery occlusion pressure (PAOP) waveform displays a significantly elevated peak occurring after the T-wave on the electrocardiogram. Which of the following best explains this specific waveform finding?

During the management of a difficult airway in a pediatric patient with Treacher Collins syndrome, the clinician decides to use a supraglottic airway (SG

A 28-year-old patient with a known history of morbid obesity and obstructive sleep apnea is undergoing an emergency appendectomy. After induction, the clinician is unable to visualize the larynx with video laryngoscopy due to redundant tissue. Mask ventilation is adequate with an oral airway. After two failed intubation attempts by an experienced provider, what is the most appropriate next step according to the difficult airway algorithm?

Following a complex six-hour maxillofacial reconstruction, the surgical team expresses concern regarding significant soft tissue swelling in the oropharynx. The patient was originally a difficult intubation requiring multiple attempts. The anesthesia provider is preparing for extubation. Which intervention provides the greatest margin of safety for this patient?

A 65-year-old patient with a history of radiation therapy to the neck and a known Mallampati Class IV airway is scheduled for a total hip arthroplasty. The patient has a clear history of a prior “cannot intubate” event during a previous surgery. The patient is currently breathing spontaneously and is cooperative. Which management strategy is most consistent with current safety standards for this patient?

A 42-year-old female with a BMI of 48 kg/m² is scheduled for an urgent laparoscopic cholecystectomy. Following induction and administration of a neuromuscular blocker, the anesthesia provider is unable to intubate after two attempts using video laryngoscopy. Attempts to provide mask ventilation with a two-person technique and an oral airway are unsuccessful, and the oxygen saturation is rapidly declining to 82%. What is the most appropriate next step?