Prevalence of QTc Prolongation in Patients With Advanced Cancer Receiving Palliative Care—A Cause for Concern?

ContextMedications commonly used for symptom control along with other known risk factors have the potential to prolong ventricular repolarization as measured by the QT interval (the time from the start of the Q wave to the end of the T wave) on a standard electrocardiogram (ECG).ObjectivesTo document the prevalence of a prolonged QT interval corrected for heart rate (QTc) interval in the palliative/oncology setting, compare automatic ECG QTc measurements with manual readings and identify any correlation between QTc prolongation and the use of drugs or other risk factors.MethodsA convenience sample of consecutive patients with cancer, admitted under or known to the palliative/supportive care teams in two metropolitan hospitals, and willing to provide an ECG recording and basic demographic information including QTc risk factors were included. Both automated and manually calculated QTc intervals were recorded. Multivariable analysis was used to determine risk factors independently associated with prolonged QTc intervals.ResultsOf the 389 participants, there was a significant difference in mean QTc between sites using automated but not manual calculations. Manual readings were therefore used with predetermined cutoffs of 0.44 seconds (males) and 0.46 seconds (females). Seventy-two (18.5%) of the participants had a prolonged QTc with six (1.5%) having a prolongation of >0.50 seconds. At-risk drugs were being taken by 218 participants (56.0% of total cohort). Factors shown to be associated with QTc prolongation included age, gender, performance status, and hypocalcemia. No specific medication was associated with increased risk.ConclusionAlthough almost 20% of patients receiving palliative care had prolongation of QTc, the possibility of serious consequences appeared to be low despite the frequent occurrence of risk factors.     

Preventing torsades de pointes by careful cardiac monitoring in hospital settings

In the electrocardiogram, the QT interval represents the time it takes the ventricular myocardium to repolarize. Prolongation of the QT interval indicates congenital or acquired abnormality of cardiac membrane channels. In the critical care setting, acquired long QT interval most commonly results from administration of common pharmacologic agents, including some antiarrhythmics and antibiotics. Patients with prolonged QT interval may be at risk for developing torsades de pointes and cardiac arrest. Furthermore, new-onset bradyarrhythmias and electrolyte disorders may increase this risk. Warning signs of impending sustained torsades de pointes include occurrence of polymorphic ventricular ectopic complexes, T-wave alternans, and nonsustained polymorphic ventricular tachycardia. Measurement and documentation of the QT interval, corrected for heart rate (QTc), is an important component of cardiac monitoring in the critical care setting. When prolonged QTc occurs in patients at risk, specific clinical interventions must be implemented to prevent the occurrence of torsades de pointes.     

Corrected QT-interval prolongation and variability in intensive care patients

Purpose

Critically ill patients are at risk for prolongation of the interval between the Q wave and the T wave in the electrocardiogram (corrected QT [QTc]). Corrected QT prolongation is probably a dynamic process. It is unknown how many patients have a QTc prolongation during their intensive care stay and how variable QTc prolongation is.

Materials and Methods

In a prospective cohort study, continuous 5-minute QTc measurements of 50 consecutive patients were collected. A prolonged QTc interval was more than 500 milliseconds for at least 15 minutes. The QT variance and variability index was used to evaluate QTc variation.

Results

Fifty-two percent of included patients had a prolonged QTc interval. In a single patient, 0.2% to 91.3% of the QTc intervals over time were prolonged. The use of erythromycin and amiodarone was associated with the mean QTc (P = .02 and P = .006, respectively). The Acute Physiology and Chronic Health Evaluation IV and Sequential Organ Failure Assessment scores were significantly higher in patients with a prolonged QTc interval (30.8 vs 8.6 and 7 vs 5.5, respectively). Eighty-four percent of all patients received at least 1 QTc-prolonging drug. The QT variance and QTc variance were significantly higher in patients with a prolonged QTc (P = .019 and P = .001, respectively).

Conclusion

Continuous QTc monitoring showed a prolonged QTc interval in 52% of intensive care patients. Severity of illness and QT and QTc variances are higher in these patients.     

Effect of ciprofloxacin and levofloxacin on the QT interval: is this a significant "clinical" event?

BACKGROUND: The widespread use of the fluoroquinolones has raised the question of the cardiac safety of these medications. This widespread use of this class of antibiotics has displayed their safety profile, which is actually more favorable than many other drug classes. The cardiac toxicity issue at the center of this discussion is the prolongation of the QT interval leading to torsade de pointes. Ciprofloxacin and levofloxacin, two of the more commonly used fluoroquinolones, are considered less likely than other fluoroquinolones to prolong the QT interval. The authors set out to evaluate the effect on the QT interval of patients after administration of ciprofloxacin and levofloxacin. METHODS: A prospective evaluation of 38 consecutive patients evaluated by the infectious disease service and receiving either ciprofloxacin or levofloxacin was undertaken. Twelve-lead electrocardiograms were obtained at baseline and at least 48 hours after the first dose of the antibiotic was administered. Both the longest QT interval and the mean QT interval were evaluated. To account for variations in heart rate, the corrected QT interval was calculated by using Bazett's formula (QTc = QT(square root of) R-R). Statistical analysis was undertaken to assess for the presence of a change after the administration of the antibiotic. RESULTS: Thirty-eight patients (mean age, 65 +/- 19 years), 23 women and 15 men, were studied. There was a small but significant increase in the longest QTc intervals over baseline in patients receiving levofloxacin; there was no significant change in the mean QTc interval. However, one patient who received levofloxacin was, statistically, an outlier and, on retrospective analysis, had demonstrated severe electrolyte disturbances at the time of the study. When this patient was excluded, the increase in the longest QTc interval was not significant. Patients receiving ciprofloxacin did not demonstrate any significant change in the longest QTc interval or mean QTc interval. CONCLUSIONS: Neither levofloxacin nor ciprofloxacin significantly prolonged the mean QTc interval over baseline. When electrolyte deficiencies in one of the patients evaluated were taken into account, this also held true for the longest QTc interval. There is, therefore, evidence that taking ciprofloxacin or levofloxacin, assuming that there are not any concurrent risk factors, will not cause a significant prolongation in the QT interval.     

Prevalence, Therapeutic Response, and Outcome of Ventricular Tachycardia in the Out-of-hospital Setting: A Comparison of Monomorphic Ventricular Tachycardia, Polymorphic Ventricular Tachycardia, and Torsades de Pointes

OBJECTIVE: To investigate out-of-hospital ventricular tachycardia (VT) cardiac arrest patients, comparing the prevalences and outcomes of the following VT subtypes among this population: monomorphic VT (MVT), polymorphic VT (PVT), and torsades de pointes (TdP, PVT with a prolonged QT interval). METHODS: This was a retrospective review from a fire department-based paramedic system of nontraumatic VT cardiac arrest patients (January 1991 to December 1994) with a supraventricular perfusing rhythm (SVPR) at some time during out-of-hospital care, with a measurable QT interval. QT interval was measured from an SVPR, and corrected QT interval (QTc) was calculated and considered prolonged if > 0.45 sec. VT was classified as polymorphic or monomorphic. TdP was defined as PVT with a prolonged QT interval. RESULTS: 196 patients were identified; six were excluded due to incomplete medical records, leaving 190 who met inclusion criteria and were used for data analysis. 117 (62%) patients had MVT, while 73 (38%) patients had PVT; of the 73 patients with PVT, 37 (51%) had normal QTc (non-TdP PVT) and 36 (49%) had prolonged QTc (TdP PVT). 97 (51%) patients had prolonged QTc (PQTc). Regardless of VT type (i.e., MVT vs PVT), 97 (51%) patients had prolonged QTc, with a mean QTc of 0.476+/-0.15 seconds prearrest and 0.464+/-12 seconds postarrest. Patients with PQTc were not more likely to have PVT (70 [37%] vs 76 [40%]; p = 0.705). No significant difference with respect to paramedic-witnessed arrests in each VT morphology group and each QT group was found. The overall hospital discharge rate was 28.4%. Regardless of VT type, patients had similar rates of out-of-hospital return of spontaneous circulation (ROSC) and hospital discharge; patients with PQTc were less likely to be discharged from the hospital (19.6% vs 37.6%; p = 0.01). 27.8% of TdP and 26.8% of non-TdP patients were discharged (p = 0.912). CONCLUSIONS: In this population of out-of-hospital VT arrest patients, MVT is the most common form of VT encountered; PVT and the subtype TdP are also seen in this population with approximately equal frequencies. All three rhythm types demonstrate similar responses to standard Advanced Cardiac Life Support therapy with equal rates of out-of-hospital ROSC and hospital discharge. PQTc may be a marker of poor clinical outcome in patients with out-of-hospital VT arrest.     

Palliative care in children in Wales: a study of provision and need

AIM: To establish incidence and prevalence of children needing palliative care in Wales. PATIENTS AND METHODS: Children were identified in three ways: (1) from paediatricians using the Welsh Paediatric Surveillance Unit (WPSU); (2) referrals to the specialist palliative medicine service based in Cardiff; and (3) children under the care of the two principal children's hospices serving Wales. All children referred or reported between January 2001 and December 2002 were included. RESULTS: A total of 226 children were identified. Fifty (22%) were identified by paediatricians, 58 (26%) were referred to the specialist paediatric palliative medicine service, 158 (70%) had been under the care of a children's hospice, and 34 (15%) were identified by more than one source. This study identified approximately 3.75 per 10000 children. This is about half the prevalence figures quoted in the ACT/ RCPCH document in 1997. CONCLUSIONS: The study may underestimate prevalence. Children needing palliative medicine are still under-recognized in Wales. The overlap between children's hospice care and specialist paediatric palliative medicine is relatively small.     

Prolonged corrected QT interval in hospitalized patients with coronavirus disease 2019 in Dubai,United Arab Emirates: a single-center, retrospective study

ObjectiveTo evaluate the association of a prolonged corrected QT (QTc) interval in severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection and its association with in-patient mortality.MethodsA cohort of 745 patients were recruited from a single center between 1 March 2020 and 31 May 2020. We analyzed the factors associated with a prolonged QTc and mortality.ResultsA prolonged QTc interval >450 ms was found in 27% of patients admitted with SARS-CoV-2 infection. These patients were predominantly older, on a ventilator, and had hypertension, diabetes mellitus, or ischemic heart disease. They also had high troponin and D-dimer concentrations. A prolonged QTc interval had a significant association with the requirement of ventilator support and was associated with an increased odds of mortality. Patients who died were older than 55 years, and had high troponin, D-dimer, creatinine, procalcitonin, and ferritin concentrations, a high white blood cell count, and abnormal potassium concentrations (hypo- or hyperkalemia).ConclusionsA prolonged QTc interval is common in patients with SARS-CoV-2 infection and it is associated with worse outcomes. Older individuals and those with comorbidities should have an electrocardiogram performed, which is noninvasive and easily available, on admission to hospital to identify high-risk patients.     

Assessment of corrected QT interval in sickle-cell disease patients who undergo erythroapheresis

Extension of the QT interval is characterized by syncope and cardiac arrest and often occurs in association with medical therapies and procedures. Whether erythroapheresis (EPH) could influence the QT interval duration in patients with sickle cell disease (SCD) is not known. We aimed to investigate the effects of EPH on the heart rate-corrected QT (QTc) interval. The study included 25 patients with SCD who underwent 34 EPH procedures. Two independent observers measured QTc interval duration from electrocardiograms performed continuously for 3 min at three different points during the EPH procedures (prior to EPH, after completion of 50% EPH and 15 min after EPH). Multiple regression analysis was used to determine if the ionized plasma calcium, the level of plasma magnesium, citrate infusion rate and painful crisis significantly contributed to the QTc interval. There was a non-significant trend (P = 0.184) towards increased QTc in sickle cell patients during EPH compared with pre-EPH values. QTc prolongation (>440 ms) occurred in 72% of the procedures. Fifty percent QTc values returned to baseline after the procedure. The independent variables were not significantly associated with QTc interval. Exchange procedures can induce QTc prolongation in patients with SCD.     

Roxithromycin induced torsade de pointes in a patient with complex congenital heart disease and complete atrioventricular block

We reported a 6-year-old girl who developed torsade de pointes (TdP) after taking roxithromycin. The patient had congenital complete heart block and complex cyanotic heart disease. Before taking roxithromycin, her corrected QT interval (QTc) was 0.39 second with a ventricular rate of 55-60 beats/min. Repetitive bursts of TdP with prolonged QT interval (QTc = 0.55 s) developed after taking roxithromycin. After stopping the medication, her QT interval normalized (QTc = 0.38 s). This case demonstrated the potential of roxithromycin in causing TdP especially in a patient with other risk factors for prolong QT interval and TdP.     

Heart Rate–Corrected QT Interval Is an Independent Predictor of All-Cause and Cardiovascular Mortality in Individuals With Type 2 Diabetes: The Diabetes Heart Study

OBJECTIVE

Heart rate–corrected QT (QTc) interval is associated with mortality in the general population, but this association is less clear in individuals with type 2 diabetes. We assessed the association of QTc interval with all-cause and cardiovascular disease (CVD) mortality in the Diabetes Heart Study.

RESEARCH DESIGN AND METHODS

We studied 1,020 participants with type 2 diabetes (83% European Americans; 55% women; mean age 61.4 years) who were free of atrial fibrillation, major ventricular conduction defects, and antiarrhythmic therapy at baseline. QT duration was automatically calculated from a standard 12-lead electrocardiogram (ECG). Following American Heart Association/American College of Cardiology Foundation recommendations, a linear scale was used to correct the QT for heart rate. Using Cox regression, risk was estimated per 1-SD increase in QTc interval as well as prolonged QTc interval (>450 ms) vs. normal QTc interval for mortality.

RESULTS

At baseline, the mean (SD) QTc duration was 414.9 ms (18.1), and 3.0% of participants had prolonged QTc. After a median follow-up time of 8.5 years (maximum follow-up time 13.9 years), 204 participants were deceased. In adjusted multivariate models, a 1-SD increase in QTc interval was associated with an 18% higher risk for all-cause mortality (hazard ratio 1.18 [95% CI 1.03–1.36]) and 29% increased risk for CVD mortality (1.29 [1.05–1.59]). Similar results were obtained when QTc interval was used as a categorical variable (prolonged vs. normal) (all-cause mortality 1.73 [0.95–3.15]; CVD mortality 2.86 [1.35–6.08]).

CONCLUSIONS

Heart rate QTc interval is an independent predictor of all-cause and CVD mortality in this population with type 2 diabetes, suggesting that additional prognostic information may be available from this simple ECG measure.     

QT interval prolongation and mortality in type 1 diabetic patients: a 5-year cohort prospective study. Neuropathy Study Group of the Italian Society of the Study of Diabetes, Piemonte Affiliate

OBJECTIVE: The aim of the study was to assess the relationship between QT interval prolongation and mortality in type 1 diabetic patients. RESEARCH DESIGN AND METHODS: Data on survival after 5 years were obtained from 316 of 379 patients (83.3%) who took part in a study on the prevalence of diabetic neuropathy and QT interval prolongation. RESULTS: Mortality at 5 years was 6.32%. Patients who survived were significantly younger (P = 0.04), had a shorter duration of diabetes (P = 0.01), had lower systolic (P = 0.004) and diastolic (P = 0.03) blood pressure levels, and had a shorter QT interval corrected for the previous cardiac cycle length (QTc) (P = 0.000005) than subjects who died. In univariate analysis, patients had a higher risk of dying if they had a prolonged QTc (odds ratio [OR] 20.14 [95% CI 5.7-70.81) or if they were affected by autonomic neuropathy (3.55 [1.4-8.9]). QTc prolongation was the only variable that showed a significant mortality OR in multivariate analysis (24.6 [6.51-92.85]; P = 0.0000004). CONCLUSIONS: This is the first cohort-based prospective study indicating that QTc prolongation is predictive of increased mortality in type 1 diabetic patients.     

Specialist palliative care and patients with noncancer diagnoses: the experience of a service

This retrospective review was undertaken to identify the pattern of noncancer referrals to a specialist palliative care service, comprising a teaching hospital support team, home care, outpatients and inpatient hospice, over a 1-year period. Of 287 hospital ward referrals, 83 patients had a noncancer diagnosis (29%); they were referred predominantly for symptom control (92%), particularly of pain (84%). Of 130 outpatient referrals, 30 had a noncancer diagnosis (23%) and were also referred mainly for the management of pain (85%). Of 196 home care referrals, 18 had a noncancer diagnosis (9%); they tended to be referred for multiprofessional care of endstage disease. Of 421 hospice inpatient admissions, 17 were for patients with a noncancer diagnosis (4%) and were predominantly for respite care. These admissions accounted for 2% of occupied bed days. It is concluded that specialist palliative care skills are perceived to be transferable to patients with noncancer diagnoses. Resource implications focus on hospital and outpatient services, where shared care with medical teams is usual practice. Defining management goals at the outset is particularly important.     

Extreme QT prolongation during therapeutic hypothermia after cardiac arrest due to long QT syndrome

During therapeutic hypothermia, QT interval is prolonged. In patients with congenital long QT syndrome (LQTs), a longer QT interval was associated with significantly increased risk of cardiac arrest (CA). Therefore, therapeutic hypothermia may have proarrhythmic effects in survivors of CA due to congenital LQTs. A 27-year-old man was resuscitated from CA due to congenital LQTs type 3 and Brugada syndrome. Torsade de pointes (TdP) recurred spontaneously on admission (body temperature, 36.9°C). During mild hypothermia therapy, QTc increased from 499 (36.9°C) to 667 milliseconds (33.8°C), although TdP was not induced. A 13-year-old boy with congenital LQTs type 1 underwent therapeutic hypothermia after resuscitation. Short-acting β-blocker was administered intravenously during this treatment. The QTc increased from 534 (36.4°C) to 626 milliseconds (34.3°C). However, TdP did not recur during mild hypothermia therapy. In both patients, electrolyte abnormalities were checked frequently and corrected immediately. QT prolongation remained a couple of days after completion of rewarming. The withdrawal of sedative drugs and extubation were not pursued before QT shortening reached to a plateau. Both patients were fully recovered from neurologic damage. During therapeutic hypothermia, QT interval was extremely prolonged, although TdP did not recur in 2 patients with congenital LQTs. Therapeutic hypothermia may be beneficial for comatose survivors of CA due to LQTs.     

Temporary disturbances of the QT interval precede the onset of ventricular tachyarrhythmias in patients with structural heart diseases

An increase in sinus rate prior to ventricular tachyarrhythmias has been demonstrated in previous studies. There is no clear data available concerning changes in ventricular de- and repolarization prior to ventricular tachyarrhythmias, especially in patients with structural heart disease. Therefore, the aim of this study was to analyze the QT and QTc interval (Bazett's formula immediately before the onset of ventricular tachyarrhythmias in stored electrograms of patients with ICDs. The study analyzed 228 spontaneous ventricular tachyarrhythmia episodes in 52 patients (mean age 64 +/- 10 years, 49 men, 3 women) and compared them with 146 electrograms of baseline rhythm recorded during regular ICD follow-up. Mean ventricular cycle length (CL), QT interval, and QTc were measured before the onset of ventricular tachyarrhythmia and during baseline rhythm. Prior to ventricular tachyarrhythmias onset, CL was significantly shorter than during baseline rhythm (714 +/- 139 vs 828 +/- 149 ms, P < 0.0001). By contrast, the QT interval (430 +/- 67 ms) and QTc interval (518 +/- 67 ms) were significantly prolonged before the onset of ventricular tachyarrhythmias as compared to baseline rhythm (QT 406 +/- 67 ms, QTc 450 +/- 61 ms; P < 0.0001). CL, QT, and QTc changes were independent of concomitant treatment with antiarrhythmic drugs. Ventricular tachyarrhythmias are preceded by a significant prolongation of the QT and QTc intervals. This phenomenon may represent a greater than normal disparity of repolarization recovery times possibly facilitating the development of ventricular tachyarrhythmias.     

The prevalence of long QT interval in post-operative intensive care unit patients

The severity of patient illnesses and medication complexity in post-operative critically ill patients increase the risk for a prolonged QT interval. We determined the prevalence of prolonged QTc in surgical intensive care unit (SICU) patients. We performed a prospective cross-sectional study over a 15-month period at a major academic center. SICU pre-admission and admission EKGs, patient demographics, and laboratory values were analyzed. QTc was evaluated as both a continuous and dichotomous outcome (prolonged QTc > 440 ms). 281 patients were included in the study: 92 % (n = 257) post-operative and 8 % (n = 24) non-operative. On pre-admission EKGs, 32 % of the post-operative group and 42 % of the non-operative group had prolonged QTc (p = 0.25); on post-admission EKGs, 67 % of the post-operative group but only 33 % of the non-operative group had prolonged QTc (p < 0.01). The average change in QTc in the post-operative group was +30.7 ms, as compared to +2 ms in the non-operative group (p < 0.01). On multivariable adjustment for long QTc as a dichotomous outcome, pre-admission prolonged QTc (OR 3.93, CI 1.93–8.00) and having had an operative procedure (OR 4.04, CI 1.67–9.83) were associated with developing prolonged QTc. For QTc as a continuous outcome, intra-operative beta-blocker use was associated with a statistically-significant decrease in QTc duration. None of the patients developed a lethal arrhythmia in the ICU. Prolonged QTc is common among post-operative SICU patients (67 %), however lethal arrhythmias are uncommon. The operative experience increases the risk for long QTc.     

Correlation between QTc interval and clinical severity of subarachnoid hemorrhage depends on the QTc formula used

OBJECTIVES: Subarachnoid hemorrhage (SAH) frequently prolongs QT interval in the acute phase. The purpose of our study is to investigate whether the correlation between electrocardiographic corrected QT interval and the clinical severity of SAH depends on QTc formula used. METHODS: We retrospectively studied 52 consecutive subjects with nontraumatic SAH (extravasation of blood into the spaces covering the central nervous system that are filled with cerebrospinal fluid) who were admitted within the first day of SAH. QT intervals were measured on a standard 12-lead electrocardiography and corrected by Bazett and Hodges formulae. All patients were evaluated according to clinical condition on admission by Hunt-Hess grades. The patients were grouped in two different categories according to QT interval corrected by Bazett and Hodges and scored by Hunt-Hess (HH) grades. RESULTS: Mean age of the study patients was 54 +/- 12 years and of those 31 (60%) were female. Mean values of heart rate and RR interval were 82 +/- 21 bpm and 777 +/- 163 msec, respectively. The mean QTc interval by Bazett and Hodges were 456 +/- 59 msec and 438 +/- 48 msec, respectively (P < 0.001). Twenty-three patients according to Bazett and fifteen according to Hodges had prolonged QTc. Correlation analyses showed relation between HH and QTc and prolonged QTc by Bazett (r = 0.278, P = 0.04 and r = 0.314, P = 0.024; respectively). There was no correlation between HH and QTc and prolonged QTc by Hodges (r = 0.204, P = 0.14 and r = 0.115, P = 0.41; respectively). CONCLUSIONS: In our study, correlation between QTc interval and clinical severity of SAH depended on the QTc formula used.     

Two cases of short QT interval

BACKGROUND: The epidemiology of short QT interval remains unclear. We attempted to determine the incidence and clinical characteristics of short QT interval in a longitudinal cohort study. METHODS: A total of 19,153 subjects (7,525 male, 11,628 female) were enrolled in the study and all available electrocardiograms (ECGs) were investigated longitudinally from 1958 through 2003. We defined short QT interval as QTc of less than 350 ms. RESULTS: Of the 19,153 subjects, two met the criteria of short QT interval and allowed for prevalence and incidence estimates for short QT interval as 0.01% and 0.39/100,000 person-years, respectively. Both cases had neither a family history of sudden cardiac death, nor a history of drug use that might have affected for QT interval. Case 1 was a female with history of ischemic heart disease. Case 2 was a 60-year-old male who exhibited a short QT interval for the first time when he was 26 years of age. He had sick sinus syndrome as an underlying heart disease. CONCLUSIONS: Of the 19,153 subjects in this study, none were identified as having the short QT syndrome, with associated high risk of ventricular tachyarrhythmia, atrial fibrillation, and sudden death. Two subjects were identified as having QTc of less than 350 ms, and allowed prevalence and incidence estimates to be made of short QT interval. There observations were suggestive of clinical relationships between short QT interval and organic or electrophysiological heart disease.     

Which cancer patients are referred to Hospital at Home for palliative care?

Previous research has shown that palliative home care use is influenced by variables such as age, socioeconomic status, presence of an informal carer, diagnosis, and care dependency. However, there is little information on its association with other health service use. This study compared 121 cancer patients referred to Hospital at Home (HAH) for palliative care with a sample of 206 cancer patients not referred who died within the same period. Electronic record linkage of NHS databases enabled investigation of patients' total input of care in their last year of life. Univariate analysis showed that patients referred to HAH were younger, lived in less deprived areas, were less likely to have been diagnosed within a month of death and to have causes other than cancer recorded on their death certificate. They were furthermore more likely to have had specialist oncology input, Macmillan nursing, Marie Curie nursing, acute hospital care, and district nursing before their last month of life. When care was received, patients referred to HAH received more hours of district nursing care. However, patients not referred to HAH began their acute hospital and district nursing input earlier (further from death) than those referred. Multivariate logistic regression analysis showed HAH referral to be negatively associated with breast and genitourinary cancers and number of noncancer causes recorded on the death certificate. Referral was significantly positively associated with specialist oncology input, Marie Curie nursing, and a late start (close to death) of acute hospital and district nursing care. It is hypothesised that referral to palliative home care is more likely among patients who have had prior contact with cancer services or are most clearly identified as cancer patients, and whose illness progression is manifested by a relatively short but intensive period of care prior to death.     

Hyperbaric oxygen therapy decreases QT dispersion in diabetic patients

Diabetes mellitus is frequently associated with the malignant ventricular arrhythmias and sudden death. The QT dispersion is the difference between the longest and shortest QT interval calculated from the standard 12-lead electrocardiogram. The QT dispersion is suggested as an index of myocardial electrical activity. An increase in QT dispersion is associated with the malignant ventricular arrhythmias and sudden cardiac death. Diabetic patients receive hyperbaric oxygen (HBO) therapy for non-healing lower extremity ulcers. The aim of this study was to determine the effect of HBO therapy on QT dispersion in diabetic patients. Thirty diabetic patients (18 male and 12 female, 59.9 +/- 10 years), who were planning to undergo ten sessions of HBO therapy in two weeks for non-healing lower extremity ulcers, were consecutively enrolled into the study. The 12-lead resting electrocardiography recordings were taken before the first HBO therapy and after the 10th HBO-therapy session. QT intervals were measured on electrocardiogram. QT intervals were corrected for heart rate by using Bazett's formula (corrected QT [QTc] = QT/ radical R - R [seconds]). QTc dispersion was significantly decreased from 59.8 +/- 17.4 msec to 52.2 +/- 15.5 msec after ten sessions of HBO therapy (p < 0.05). However, maximum QTc, minimum QTc and mean QTc did not change significantly after HBO therapy. We have concluded that HBO therapy may reduce the risk of malignant ventricular arrhythmia and sudden cardiac death in diabetic patients when applied repetitively.