Nokea
How do oxygen radicals react with different molecules?
- A. By accepting an electron
- B. By donating an electron
- C. By accepting a proton
- D. By donating a proton
Correct Answer: A
Rationale: Oxygen radicals grab electrons unpaired, they steal, wrecking cells, not giving or juggling protons. A chronic chaos starter nurses know this chemistry bite.
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Which nursing action should be included in the plan of care for a client returning to the surgical unit following a left modified radical mastectomy with dissection of axillary lymph nodes?
- A. Obtain permanent breast prosthesis before the patient is discharged from the hospital
- B. Teach the patient to use the ordered patient-controlled analgesia (PCA) every 10 minutes
- C. Place a pink bracelet on the client warning against venipunctures or blood pressures in the left arm
- D. Insist that the patient examine the surgical incision when the initial dressings are removed
Correct Answer: C
Rationale: Mastectomy with axillary dissection risks lymphedema a pink bracelet flags the left arm, barring venipuncture or BP cuffs to prevent swelling, a priority in post-op care. Prosthesis comes later, post-healing. PCA teaching avoids rigid timing PRN's key. Forcing incision checks risks distress, not healing. Nurses lock in this bracelet, safeguarding lymph flow, a must-do in this surgical aftermath to dodge chronic arm woes.
What is the highest likelihood that a doctor acquires HIV from a needlestick injury from an HIV pt?
- A. 0.30%
- B. 2%
- C. 5%
- D. 10%
Correct Answer: A
Rationale: HIV needlestick 0.3% odds, not 2-30's wild leaps. Nurses glove up, a chronic prick stat.
The glycaemic profiles of people living with diabetes is affected by the following EXCEPT:
- A. Monitoring of blood glucose
- B. Dietary intake
- C. Exercise
- D. Stress
Correct Answer: A
Rationale: Diabetes' sugar swings dance to diet, exercise, stress, and meds intake, burn, cortisol, and pills all tug levels. Monitoring tracks, not tweaks, the profile; it's a mirror, not a mover. Clinicians lean on this quintet's interplay, adjusting levers, not the gauge, a chronic puzzle where tools shape, not tally, the game.
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.
A 7-year-old child with osteosarcoma is being treated with chemotherapy. Which medication would the nurse expect the physician to order most commonly as a prophylaxis against Pneumocystis jirovecii?
- A. Trimethoprim-sulfamethoxazole
- B. Ketoconazole
- C. Filgastim
- D. Prednisone
Correct Answer: A
Rationale: Osteosarcoma chemotherapy compromises the immune system, increasing susceptibility to opportunistic infections like Pneumocystis jirovecii pneumonia (PCP), a serious risk in immunocompromised children. Trimethoprim-sulfamethoxazole (TMP-SMX) is the most common prophylactic antibiotic for PCP, effectively preventing this lung infection by targeting its causative organism. Ketoconazole treats fungal infections but not PCP, which is caused by a fungus-like organism requiring specific therapy. Filgrastim stimulates neutrophil production to combat neutropenia, not PCP directly. Prednisone, a corticosteroid, suppresses immunity and reduces tumor-related edema but doesn't prevent infections and may increase risk. The nurse anticipates TMP-SMX due to its established role in pediatric oncology protocols, ensuring protection against a preventable, potentially fatal complication during chemotherapy.