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The nurse receives an order to infuse heparin 1200 units/hr IV. The IV bag contains 25,000 units heparin in 500 mL D5W. Calculate the IV rate in mL/hr.
- A. 20
- B. 24
- C. 28
- D. 30
Correct Answer: B
Rationale: Heparin's drip: 1200 units/hr from 25,000 units in 500 mL 500 ÷ 25,000 = 0.02 mL/unit, times 1200 = 24 mL/hr, a nurse's calc to thin blood right. Off numbers (20, 28, 30) skew dosing. Precision keeps clots at bay, a steady flow in this IV dance.
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A widowed mother of four school-age children is hospitalized with metastatic ovarian cancer. The patient is crying and tells the nurse that she does not know what will happen to her children when she dies. Which response by the nurse is most appropriate?
- A. Don't you have any friends that will raise the children for you?'
- B. Would you like to talk about options for the care of your children?'
- C. For now you need to concentrate on getting well and not worrying about your children.'
- D. Many patients with cancer live for a long time, so there is time to plan for your children.'
Correct Answer: B
Rationale: Metastatic ovarian cancer's end-stage she's scared for her kids. Asking about options opens a lifeline, validating her fear without shutting it down. Friends assumes too much; get well' dodges reality; long time' sugarcoats. Nurses in oncology lean in here listening, planning ease her burden, a human touch amid grim odds.
In caring for a patient with neutropenia, what tasks can be delegated to the nursing assistant?
- A. Take vital signs every 4 hours
- B. Report temperature elevation >100.4°F
- C. Assess for sore throat, cough, or burning with urination
- D. Gather the supplies to prepare the room for protective isolation
Correct Answer: A
Rationale: Neutropenia heightens infection risk, requiring team vigilance. Taking vital signs every 4 hours fits nursing assistants' scope routine monitoring flags fevers, key in neutropenia, without needing assessment skills. Reporting fever >100.4°F is their duty once detected, but assessing symptoms like sore throat or cough demands RN judgment to interpret infection signs. Gathering supplies for isolation is assistive, not evaluative, suiting their role. Handwashing's universal, not a task to delegate. Vital signs delegation ensures timely data collection, freeing nurses to analyze and act, a practical split in caring for this vulnerable patient.
A nurse is caring for a client who presented to the emergency department with complaints of fatigue, palpitations, and chest pains. Upon assessment, the provider notes an S3 and S4 gallop, weak peripheral pulses, and tachycardia. The provider orders a chest x-ray and echocardiogram, which reveals left ventricular dilation. Which of the following disorder is consistent with these findings?
- A. Cardiac tamponade
- B. Dilated cardiomyopathy
- C. Pericarditis
- D. Restrictive cardiomyopathy
Correct Answer: B
Rationale: Left ventricular dilation with S3, S4, weak pulses, and tachycardia paints dilated cardiomyopathy heart muscle stretches, weakening pump, causing fatigue and palpitations. Tamponade compresses, not dilates. Pericarditis inflames without dilation. Restrictive stiffens, resisting stretch. Nurses tie this to DCM's systolic flop, anticipating meds like ACE inhibitors, a fit for this stretched-out heart.
A nurse is caring for a client who was received in the emergency department with a heart rate of 220 beats per minute. The client's cardiac monitor displays supraventricular tachycardia (SVT). Which of the following interventions should the nurse anticipate?
- A. Apply compression stockings
- B. Perform Valsalva maneuver
- C. Draw labs
- D. Check blood glucose
Correct Answer: B
Rationale: SVT's 220 bpm blitz needs breaking Valsalva maneuver, bearing down, jolts the vagus nerve, slowing rate, a first-line trick. Stockings aid veins, not rhythm. Labs or glucose inform, don't fix. Nurses anticipate this, calming tachycardia, a quick, non-invasive hit in this racing heart emergency.
Melatonin is a hormone that is involved in the regulation of the circadian rhythm. Features of melatonin include:
- A. It circulates in the cerebrospinal fluid and blood.
- B. It has a plasma elimination half-life of 4 h.
- C. It is derived from tryptophan.
- D. It activates the pituitary adenylate cyclase mechanism of circadian wakefulness.
Correct Answer: A
Rationale: Melatonin, produced by the pineal gland, regulates sleep-wake cycles. It circulates in blood and cerebrospinal fluid, crossing the blood-brain barrier to signal darkness via the suprachiasmatic nucleus (SCN). Its half-life is short, about 30-60 minutes, not 4 hours, enabling rapid response to light cues. Synthesized from tryptophan via serotonin, it's a biochemical derivative responsive to environmental triggers. It acts on melatonin receptors (MT1, MT2) in the SCN, suppressing wakefulness-promoting adenylate cyclase, not activating pituitary mechanisms for wakefulness that's a misattribution. Its role dampens alertness, promoting sleep. Circulation in bodily fluids ensures systemic distribution, aligning circadian rhythms with night, making it foundational to sleep physiology and fatigue management.