Preoperative headache in patients submitted to unrupted brain aneurysm clamping

BACKGROUND AND OBJECTIVES: Headache is a major symptom referred by patients with brain aneurysm. As other types of pain, it is often ignored by the multiprofessional team. Although important, headache evaluation in the preoperative period of brain aneurysm clamping is a challenge for the health team. This study aimed at evaluating preoperative headache of patients submitted to unrupted aneurysm clamping. METHODS: This is a descriptive, exploratory and quantitative study carried out between September 2014 and May 2015 in the neurosurgery sector and the intensive care unit of a mediumsized hospital. Sample was made up of 28 patients in the preoperative period of elective craniotomy to treat unrupted brain aneurysm. Mann-Whitney, Kruskal-Wallis and Fisher Exact tests were used with significance level of 5%. RESULTS: It was observed that 78.6% of patients were females with mean age of 46.7 years. Moderate pulsing and frontal headache was the most prevalent pain. Nausea and vomiting were also present, as well as pain in the eye. Pain has worsened with physical effort and shaking the head. There has been statistically significant difference for the variables pain recurrence and pain in the eye. CONCLUSION: This article clarifies major items to be investigated to evaluate headache of brain aneurysm patients and its characteristics to help early diagnosis and better neurologic recovery.


INTRODUCTION
Brain aneurysms (BA) are common and affect from 3 to 6% of world population above 30 years of age 1 .Severe headache is a major symptom referred by BA patients 2,3 , especially with unrupted BA 4 .As other types of pain, this is a sensory, individual and untransferable experience often ignored by the health team.The reason for headaches has not yet been consistently explained, but it is believed that a possible mechanism is related to vascular distention caused by malformation in the walls of vessels involved with BAs 5 .
ORIGINAL ARTICLE DOI 10.5935/1806-0013.20160007Preoperative headache in patients submitted to unrupted brain aneurysm clamping Rev Dor.São Paulo, 2016 jan-mar;17 (1):24-8 Factors such as anxiety and depression may interfere with the frequency and intensity of acute headache in the preoperative period of unrupted BA clamping.There are evidences that this pain significantly improves after surgical treatment.However, the mechanism for such improvement is not yet clear 4 .Due to major negative repercussions of headache on the life of a person, adequate evaluation and management of this pain are critical for early clinical recovery 6 .Notwithstanding its importance, headache evaluation in the preoperative period of unrupted BA is still a challenge for the health team and has to be better studied to establish adequate therapy, enhance neurological recovery and decrease patients' distress.
In light of the above, this study aimed at evaluating preoperative headache in patients submitted to unrupted aneurysm clamping.

RESULTS
Participated in the study 28 BA patients.There has been predominance of females (78.6%) and mean age was 47.6±11.2years.Patients' age has varied from 18 to 69 years, with higher frequency for ages above 45 years (67.9%).
With regard to clinical variables, it was observed that 21.4% of patients had previous diagnosis of arterial hypertension (AH) and 10.7% had AH associated to diabetes mellitus (DM).When asked about the reason for looking for health services, all patients have referred sudden and severe headache.In 28.0% of cases, headache was associated to syncope and in 22.0% to impaired level of consciousness (Table 1).
It has been identified that 64.3% of patients used simple analgesics at home to relieve pain.These drugs are not systematically self-administered.Previous surgeries were reported by 46.4% of patients, of whom 30.7% had already been submitted to previous aneurysm clamping.It has to be stressed that one patient has referred being submitted to craniotomy due to brain trauma.In addition, 21.4% have reported family history of neurological surgeries (Table 1).
With regard to preoperative pain, 53.6% of patients had headache and pain intensity was moderate in 28.6% of cases.There has been prevalence of pulsing frontal headache (Table 2).It was observed that 85.7% had pain for more than one week, lasting more than one hour in 60.4% of respondents.
It should be highlighted that mean pain intensity for patients reporting having it for less than seven days was exacerbated as compared to those feeling it for a longer time.However, this difference was not statistically proven.On the other hand, in case of pain recurrence, there has been significant difference in mean pain intensity between patients referring it and denying it (Table 3).
As to headache-associated symptoms, only nausea was significant for mean pain intensity.Major factors worsening headache according to patients were physical effort and shaking of head in 46.4% and 28.6% of cases, respectively (Table 4).Among studied neurosensory changes, pain in the eye was associated to headache (Table 5).Data have shown that pain was managed with simple analgesics, weak opioids and non-steroid anti-inflammatory drugs (NSAIDs), being more prevalent the association among the three drugs (75%).In 35.7% of cases, drugs were prescribed "as needed".Although pain was severe in 7.1% of patients there were no prescriptions of strong opioids.

DISCUSSION
BA-induced headache leads to patient distress with negative repercussions in health recovery and rehabilitation process.For this reason, this pain deserves being systematically and broadly evaluated aiming at assuring better health team performance for the adequate management of this pain.Historically, females are more concerned with health than males, so they look more often for health services and are submitted to a larger number of diagnostic and therapeutic procedures 7 .This might be the explanation for the predominance of females in our study.Mean age was 47.6 years, with emphasis to age group above 45 years, which confirms other studies carried out with patients submitted to craniotomy 8,9 .AH and DM were common among studied patients.This might have influenced headache frequency and intensity 10 .In addition, cardiovascular and metabolic diseases might contribute to poorer clinical diagnosis 11 .So, the health team should detect them early aiming at minimizing their noxious effects on patients' clinical recovery, such as postoperative intracranial hypertension and metabolic imbalances.
Although females look more often for health services 7 and AH and DM require regular medical follow up, the demand for health services was caused by sudden factors, that is, persistent headache previous to hospitalization in many patients was not a reason for the early search for health professionals.
Most part of the sample has chosen self-medication in moments of pain exacerbation.This is worrisome because when aneurysms are not early treated, there is risk of rupture, which negatively influences patients' health status.
The history of previous surgeries may trigger anxiety and, consequently, reflect in increased preoperative pain intensity 12 .Pain worsening brings several damages to patients, such as increased heart work, decreased blood offering to tissues and increased distress 13 , which may also be noxious for patients' clinical recovery.
Most patients had preoperative moderate, pulsing and frontal headache.Studies evaluating the prevalence of pain in patients submitted to craniotomy had high frequency of preoperative pain with similar characteristics [8][9][10][11][12][13][14] .The presence of aneurysm might have influenced pain pulsing character and frontal location.Nausea and vomiting were symptoms referred by patients with pain.Prophylactic administration of antiemetics may decrease and/or prevent nausea and vomiting in patients submitted to craniotomy 15 .Adequate prevention and treatment of nausea and vomiting minimizes possible postoperative troubles such as bronchial aspiration, hydroelectrolyte imbalance and increased intracranial pressure.In addition, they decrease physical efforts and consequently pain.Pain intensity may increase when patients perform simple activities such as standing up or walking 9 , with risk of early aneurysm rupture.In our study, physical effort and shaking of head were associated to pain worsening.So, the health team should orient patients to avoid sudden changes in position, as well as help them walking and performing daily activities.
Other factors associated to headache are neurosensory changes, such as pain in the eye.Similar study with patients submitted to aneurysm clamping has found relationship between headache, pain in the eye and visual symptoms 10 .In our study, visual changes had no significant association.It is possible that neurosensory changes are related to intracranial aneurysm location.Simple analgesics, associated to NSAIDs and weak opioids, were more often prescribed.However such prescriptions had no fixed administration times.The use of analgesics in fixed time prevents major fluctuations of drug plasma level and peaks of pain.Multimodal analgesic therapy is emphasized not only for its effectiveness but for decreasing doses and, as a consequence, preventing adverse effects 4 .Prophylactic administration of analgesics in a systematic manner is critical to maintain patients' hemodynamic balance and to assure effective neurosurgical recovery.
It should be highlighted that pain control is patients' right which should be assured aiming at preventing noxious effects of pain, thus assuring adequate assistance 13 .

CONCLUSION
Headache in patients in the preoperative period of BA clamping is in general moderate, frontal and pulsing.Nausea and vomiting are often associated to pain, which worsens with physical effort and shaking of head.Pain in the eye may also be present in these patients.Analgesics were not systematically prescribed, being insufficient for total pain relief.Headache is common in patients in the preoperative period of aneurysm clamping, but its evaluation is still a challenge for the multiprofessional team.So, this study explains major items to be investigated and general headache characteristics of these patients.This helps improving the level of suspicion of health professionals with regard to the presence of brain aneurysms, which helps early diagnosis and faster improvement of neurological recovery.

Table 1 .
Clinical profile of patients in the preoperative period of aneurysm clamping.Aracaju, SE, Brazil, 2015

Table 2 .
Characterization of preoperative headache of patients submitted to aneurysm clamping.Aracaju, SE, Brazil, 2015

Table 3 .
Association between mean headache intensity and temporal characterization of pain in patients in the preoperative period of aneurysm clamping.Aracaju, SE, Brazil, 2015 *Mann-Whitney test; ** Kruskal-Wallis test.

Table 4 .
Headache intensity and presence of other symptoms in patients in the preoperative period of aneurysm clamping.Aracaju, SE, *Mann-Whitney test; ** Kruskal-Wallis test.

Table 5 .
Association of neurosensory changes and headache in patients in the preoperative period of aneurysm clamping.Aracaju, SE, *Fisher Exact test.