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Original Abstract of the Article

Major Research Findings

Hydromorphone is an effective pain reliever, but it can also have undesirable side effects. Research has shown that hydromorphone side effects can vary depending on the dose, route of administration, and the patient's condition. For instance, a study 16 found that patients who received hydromorphone before surgery had less blood pressure and heart rate variability during surgery, less postoperative pain intensity and morphine consumption, and higher satisfaction. However, a study 8 comparing morphine and hydromorphone concluded that, contrary to the traditional perception of healthcare professionals that hydromorphone is superior to morphine in pain control and has fewer side effects, the efficacy and side effect profiles of morphine and hydromorphone were equivalent.

A study 27 suggests the potential for developing a new type of opioid that acts on both the mu opioid receptor (MOR) and the delta opioid receptor (DOR) by modifying the chemical structure of hydromorphone, which could reduce side effects. This new opioid acts as a partial agonist at MOR and a full agonist at DOR, suggesting that it may reduce side effects such as respiratory depression. Furthermore, a study 14 suggests the potential to reduce side effects by binding hydromorphone to macromolecules, allowing for targeted drug delivery to inflamed areas of joints. This study showed that hydromorphone-bound polymers accumulated in inflamed areas of the joints in a rat model of arthritis and suppressed inflammatory pain.

Reasons for Side Effects

Hydromorphone is an opioid analgesic that exerts its analgesic effects by binding to opioid receptors in the brain. However, opioid receptors are also present in various parts of the brain, including the respiratory center, the vomiting center, and the gastrointestinal motility center, so they can also act on these parts and cause side effects. In addition, hydromorphone can act on the central nervous system, causing side effects such as decreased level of consciousness, respiratory depression, gastrointestinal symptoms, and dependence.

Common Side Effects

Gastrointestinal

Constipation is one of the most common side effects of opioids. A study 12 reported a case where constipation caused by hydromorphone led to Ogilvie syndrome (paralytic ileus) and bowel perforation. A study 11 showed that subcutaneous injection of hydromorphone in cats caused side effects such as vomiting. A study 2 reported that intravenous hydromorphone administration after surgery increased the risk of postoperative hypoxemia.

Respiratory

Hydromorphone can cause respiratory depression. A study 27 suggests that a new type of opioid that acts on both MOR and DOR may reduce side effects such as respiratory depression. A study 2 reported that intravenous hydromorphone administration after surgery increased the risk of postoperative hypoxemia.

Nervous System

Hydromorphone can cause side effects such as decreased level of consciousness, drowsiness, dizziness, headache, and hallucinations. A study 17 reported a case where hydromorphone caused hallucinations. A study 25 reported that the combined use of hydromorphone and dexmedetomidine in terminally ill cancer patients improved symptoms such as pain, agitation, sleep disturbance, anxiety, and cravings. However, dexmedetomidine can cause side effects such as hallucinations, nightmares, and psychomotor agitation.

Other

Hydromorphone can cause side effects such as dependence, tolerance, urinary retention, pruritus, and sweating. A study 3 suggests that tapentadol may have lower dependence and abuse potential than hydromorphone. A study 19 investigated side effects from long-term use of hydromorphone and diacetylmorphine.

Countermeasures for Side Effects

Constipation Countermeasures

Countermeasures for constipation include hydration, dietary fiber intake, and exercise. Laxatives can also be used if necessary. A study 12 reported that new drugs such as methylnaltrexone are effective in treating opioid-induced constipation. However, methylnaltrexone carries the risk of side effects such as bowel perforation, so caution is necessary.

Respiratory Depression Countermeasures

Countermeasures for respiratory depression include monitoring the patient's respiratory status. Oxygen administration or mechanical ventilation may be required if necessary. A study 2 suggests that the risk of hypoxemia may be reduced by administering low doses of a base infusion when administering hydromorphone intravenously.

Hallucination Countermeasures

Hallucinations may improve by reducing the dose of hydromorphone. Antipsychotics can also be used if necessary. A study 17 reported a case where hydromorphone caused hallucinations. Discontinuation of hydromorphone administration has been shown to resolve hallucinations.

Comparison Between Studies

Commonalities

Many studies have shown that hydromorphone is an effective analgesic. However, it has also been shown that it carries the risk of side effects.

Differences

Studies have reported different rates and severities of side effects from hydromorphone. This is thought to be influenced by a variety of factors such as the patient population studied, the dose and route of administration of hydromorphone, and concomitant medications.

Precautions for Application in Real Life

Hydromorphone is a potent analgesic, but it also carries the risk of dependence and respiratory depression. Therefore, it is important to use hydromorphone in appropriate doses as directed by your doctor. If you experience side effects, consult your doctor immediately. In particular, caution should be exercised in the elderly and patients with impaired liver or kidney function, as they are more susceptible to side effects. In addition, pay attention to drug interactions when using hydromorphone in combination with other drugs.

Limitations of Current Research

Many studies on hydromorphone have been conducted on a small scale, and caution is required when generalizing the results. In addition, the patient populations studied may be skewed toward patients with specific diseases, so it is unclear whether the results can be applied to other patient populations.

Future Research Directions

Further research is needed to elucidate the mechanisms of hydromorphone-induced side effects. In particular, there is hope for the development of biomarkers to predict the occurrence of side effects and the development of new drugs to reduce side effects. Furthermore, appropriate patient education and early detection and management of side effects are important for the safe use of hydromorphone. Therefore, improvements in patient education by doctors and pharmacists are required.

Conclusion

Hydromorphone is an effective analgesic, but it also carries the risk of side effects. When using hydromorphone, follow your doctor's instructions and consult your doctor immediately if you experience side effects. It is hoped that further research will elucidate the mechanisms of hydromorphone side effects and develop drugs that can reduce side effects.


Literature analysis of 28 papers
Positive Content
22
Neutral Content
3
Negative Content
3
Article Type
7
0
2
3
27

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