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Clinical factors associated with hypomagnesemia among patients with cardiac conditions: cross-sectional study

SPMC J Health Care Serv. 2018;4(1):2 ARK: http://n2t.net/ark:/76951/jhcs74qyf9

Arlyn Gaballo Awing,1 2 Aryeel Llanos3 4 5 6 7

1Misamis Oriental Provincial Hospital - Gingoog, Doña Graciana St, San Miguel, Gingoog City, Misamis Oriental, Philippines
2Agusan del Norte Provincial Hospital, Butuan City, Agusan del Norte, Philippines
3Department of Internal Medicine, Davao Regional Medical Center, Apokon, Tagum City, Philippines
4Bishop Joseph Regan Memorial Hospital, Christ the King Road, Tagum City, Davao del Norte, Philippines
5Medical Mission Group Hospital and Health Services Cooperative of Tagum, Department of Trade and Industry - Davao del Norte Field Office, Tagum City, Davao del Norte, Philippines
6Tagum Doctors Hospital Inc, National Highway, 54 Rabe Subdivision, Tagum City, Davao del Norte, Philippines
7Aquino Medical Specialists Hospital Inc, Mabini St, Tagum City, Davao del Norte, Philippines

Correspondence Arlyn Gaballo Awing, arlynawing@gmail.com
Article editors Emily Doliente-Gavarra, Jay Lord Canag
Received 5 July 2017
Accepted 4 April 2018
Cite as Awing AG, Llanos A. Clinical factors associated with hypomagnesemia among patients with cardiac conditions: cross-sectional study. SPMC J Health Care Serv. 2017;4(1):2. http://n2t.net/ark:/76951/jhcs74qyf9


Background. Serum magnesium levels are usually measured and corrected, if warranted, among patients with cardiac diseases.

Objective. To determine the rate of and clinical factors associated with hypomagnesemia among patients with cardiac conditions.

Design. Cross-sectional study.

Setting. Davao Regional Medical Center (DRMC) in Tagum City, Philippines, from January 2014 to January 2016.

Participants. 59 males and 53 females with cardiac diagnoses and serum magnesium level determination results.

Main outcome measures. Rate of hypomagnesemia, odds ratios (95% CI) of having hypomagnesemia for selected clinical factors.

Main results. The mean age of the patients was 60.72 ± 16.73 years. The mean serum magnesium level was 0.75 ± 0.23 mmol/L, and 47/112 (41.96%) had hypomagnesemia (serum magnesium <0.7 mmol/L). Unadjusted prevalence odds ratios (POR) for having hypomagnesemia were significantly high for chronic obstructive pulmonary disease (COPD) comorbidity (POR=5.50; 95% CI 1.09 to 27.76; p=0.0392), stroke comorbidity (POR=2.78; 95% CI 1.15 to 6.71; p=0.0227), taking diuretic medications (POR=4.66; 95% CI 1.38 to 15.71; p=0.0132), and having atrial fibrillation during the admission (POR=2.26; 95% CI 1.04 to 4.91; p=0.0394).

Conclusion. In this study, 41.96% of the patients had hypomagnesemia. COPD and stroke comorbidities, diuretic therapy, and atrial fibrillation among patients with cardiac conditions were all significantly associated with hypomagnesemia.

Keywords. serum magnesium, atrial fibrillation, stroke, chronic obstructive pulmonary disease, diuretics


Serum magnesium levels are monitored and, if necessary, corrected as part of the management of patients with cardiac disease.1 2 3 4 5 Magnesium helps maintain cardiac rhythm,6 7 and certain cardiac arrhythmias are associated with hypomagnesemia.8 9 Hypermagnesuria10 11 and low serum magnesium levels12 13 have also been observed among patients on digoxin. Outside of these associations, little is known about the relationship of certain clinical characteristics with hypomagnesemia among patients with cardiac disease.

Arrhythmias often complicate structural heart diseases, acute coronary syndromes, and other cardiac conditions, and cause significant morbidity or even death.14 15 16 17 The knowledge of clinical characteristics that frequently accompany hypomagnesemia among patients with different heart diseases can better inform clinicians about the expected course of illness and appropriate diagnostic management of patients in this context. We did this study in order to determine the rate of hypomagnesemia among patients with cardiac conditions and to identify clinical factors associated with low magnesium levels among patients in this subgroup.


Study design and setting
We conducted a cross-sectional study based on the medical records of patients with cardiac diseases admitted at Davao Regional Medical Center (DRMC) in Tagum City, Philippines from January 2014 to January 2016. DRMC is a tertiary care hospital in Southern Philippines. Patients under the Internal Medicine Department with cardiac conditions are usually admitted in the general medical ward, the medical intensive care unit, or the coronary care unit of the hospital.

Patients aged 14 years old and over, diagnosed and admitted for any cardiac disease, and with at least one laboratory result of serum magnesium level during admission were eligible for inclusion into the study. We excluded patients with history of recurrent hypokalemia, as well as those who transferred to other institutions or went home against medical advice after serum magnesium level determination. We estimated the sample size for this study using StatCalc from Epi Info™ based on the assumptions that 30% of patients with cardiac conditions have hypomagnesemia, and that 50% of patients with hypomagnesemia have premature ventricular complexes (PVC), a common type of cardiac arrhythmia, while 21% of patients without hypomagnesemia have PVC.18 In a computation for odds ratio to determine the association of selected clinical factors with hypomagnesemia carried out with <5% level of significance, a total sample size of 112 patients will have 80% power of rejecting the null hypothesis—no significant increase or decrease in odds ratio—if the alternative holds.

Data collection
From the medical records of each patient, we collected data on age, sex, cardiac disease diagnosis, comorbidities (hypertension, diabetes mellitus, dyslipidemia, chronic obstructive pulmonary disease, acute renal failure, chronic renal failure, stroke and malignancy), and use of digoxin, steroids, and diuretics. We also collected data on documented occurrence of any cardiac arrhythmias and/or death during admission. Finally, we also noted the serum magnesium level for each patient. For a patient who had two or more serum magnesium levels in the medical records, we only collected the value of the first serum magnesium level taken closest to the admission date. We considered hypomagnesemia when the patient’s serum magnesium level was <0.7 mmol/L.

Statistical analysis
We summarized continuous variables as means and standard deviation and compared means using t-test. We summarized categorical variables as frequencies and percentages and compared proportions using chi-square test or Fisher’s exact test. Association of variables were expressed as prevalence odds ratios (POR) and their 95% confidence intervals. We performed univariate logistic regression to determine the unadjusted association of clinical factors with hypomagnesemia. We also performed multivariable logistic regression analysis of individual medical comorbidities, medications, and clinical events for their association with hypomagnesemia adjusted for age, sex, and cardiac diagnosis. We used Epi Info™ 7.2.1 for all our statistical tests.


A total of 112 patients were included in this analysis. There were 59/112 (52.68%) males and 53/112 (47.32%) females, and the mean age of the patients was 60.72 ± 16.73 years (range: 17 to 95 years). The mean serum magnesium level was 0.75 ± 0.23 mmol/L among all the patients, and 47/112 (41.96%) had hypomagnesemia. Table 1 shows the demographic and clinical profile of patients both as total sample and as divided according to the presence or absence of hypomagnesemia. Compared to the group without hypomagnesemia, the group with hypomagnesemia had significantly higher proportions of patients with chronic obstructive pulmonary disease (7/47, 14.89% versus 2/65, 3.08%; p=0.0336), stroke (17/47, 36.17% versus 11/65, 16.92%; p=0.0203), and documented atrial fibrillation during admission (31/47, 65.96% versus 30/65, 46.15%; p=0.0378). There was also a significantly higher proportion of patients on diuretics in the hypomagnesemia group than in the non-hypomagnesemia group (11/47, 23.40% versus 4/65, 6.15%; p=0.0082).

Table 1    Clinical characteristics of patients
Characteristics Total
With Hypomagnesemia
Without Hypomagnesemia
Mean age ± SD, years 60.72 ± 16.73 62.38 ± 17.69 59.52 ± 16.03 0.3715
Sex, frequency (%) 0.9263
   Male 59 (52.68) 25 (53.19) 34 (52.31)
   Female 53 (47.32) 22 (46.81) 31 (47.69)
Cardiac diagnoses, frequency (%)*
   Stable angina 38 (33.93) 19 (40.43) 19 (29.23) 0.2168
   Unstable angina 8 (7.14) 2 (4.26) 6 (9.23) 0.4644†
   NSTEMI 30 (26.79) 14 (29.79) 16 (24.62) 0.5419
   STEMI 16 (14.29) 6 (12.77) 10 (15.38) 0.6359
   Congenital heart disease 1 (0.89) 0(0) 1 (100.00) 1.0000†
   Dilated cardiomyopathy 10 (8.93) 3 (6.38) 7 (10.77) 0.5158†
   Rheumatic heart disease 5 (4.46) 1 (2.13) 4 (6.15) 0.3966†
   Valvular heart disease 3 (2.68) 1 (2.13) 2 (3.08) 1.0000†
   Thyrotoxic heart disease 7 (6.25) 2 (4.26) 5 (7.69) 0.6970†
Medical comorbidities, frequency (%)*
   Heart failure 71 (63.39) 28 (59.57) 43 (66.15) 0.4757
   Hypertension 69 (61.61) 32 (68.09) 37 (56.92) 0.2452
   Diabetes mellitus 25 (22.32) 11 (23.40) 14 (21.54) 0.8150
   Dyslipidemia 9 (8.04) 3 (6.38) 6 (9.23) 0.7319†
   COPD 9 (8.04) 7 (14.89) 2 (3.08) 0.0336†‡
   Acute renal failure 28 (25.00) 13 (27.66) 15 (23.08) 0.5804
   Chronic renal failure 7 (6.25) 5 (10.64) 2 (3.08) 0.1283†
   Stroke 28 (25.00) 17 (36.17) 11 (16.92) 0.0203†
Medication, frequency (%)*
   Digoxin 7 (6.25) 4 (8.51) 3 (4.62) 0.4505†
   Steroids 5 (4.46) 4 (8.51) 1 (1.54) 0.1594†
   Diuretics 15 (13.39) 11 (23.40) 4 (6.15) 0.0082†‡
Clinical events, frequency (%)*
   Atrial fibrillation 61 (54.46) 31 (65.96) 30 (46.15) 0.0378‡
   Ventricular tachycardia 5 (4.46) 1 (2.13) 4 (6.15) 0.3966†
   Died 18 (16.07) 5 (10.64) 13 (20.00) 0.1830
*One patient may have more than one cardiac diagnosis, medical comorbidity, medication, or clinical event.
†Compared using Fisher’s exact test.
‡Significant at p<0.05.
COPD—chronic obstructive pulmonary disease; NSTEMI—Non-ST-elevation myocardial infarction; STEMI—ST-elevation myocardial infarction.

Table 2 shows the association of selected clinical factors with hypomagnesemia on univariate logistic regression analysis. COPD comorbidity (POR=5.50; 95% CI 1.09 to 27.76; p=0.0392), stroke comorbidity (POR=2.78; 95% CI 1.15 to 6.71; p=0.0227), diuretic therapy (POR=4.66; 95% CI 1.38 to 15.71; p=0.0132), and documented atrial fibrillation during admission (POR=2.26; 95% CI 1.04 to 4.91; p=0.0394) were all significantly associated with hypomagnesemia. After adjusting for age, sex and cardiac diagnosis (Table 2), COPD comorbidity (adjusted POR=6.54; 95% CI 1.03 to 41.66; p=0.0469), diuretic therapy (adjusted POR=4.92; 95% CI 1.32 to 18.31; p=0.0175), and documented atrial fibrillation during admission (adjusted POR=3.12; 95% CI 1.22 to 7.96; p=0.0171) remained to be associated with hypomagnesemia.

Table 2    Logistic regression analysis showing the association of selected clinical factors with hypomagnesemia
Clinical factors Unadjusted Adjusted*
Prevalence odds ratio
(95% CI)
p-value Prevalence odds ratio
(95% CI)
Medical comorbidities
   Hypertension 1.61 (0.74 to 3.54) 0.2321 1.26 (0.51 to 3.11) 0.6120
   Heart failure 0.75 (0.35 to 1.64) 0.4761 0.79 (0.32 to 1.91) 0.5949
   Diabetes mellitus 1.11 (0.45 to 2.73) 0.8142 0.94 (0.36 to 2.41) 0.8903
   Dyslipidemia 0.67 (0.16 to 2.83) 0.5863 0.64 (0.14 to 2.94) 0.5646
   COPD 5.50 (1.09 to 27.76) 0.0392† 6.54 (1.03 to 41.66) 0.0469†
   Acure renal failure 1.27 (0.54 to 3.02) 0.5809 1.34 (0.52 to 3.43) 0.5450
   Chronic renal failure 3.75 (0.69 to 20.23) 0.1244 3.18 (0.56 to 18.19) 0.1933
   Stroke 2.78 (1.15 to 6.71) 0.0227† 2.48 (0.95 to 6.43) 0.0624
   Digoxin 1.92 (0.41 to 9.03) 0.4075 13.69 (0.91 to 207.11) 0.0589
   Steroids 5.95 (0.64 to 55.1 0) 0.1161 6.44 (0.54 to 76.91) 0.1412
   Diuretics 4.66 (1.38 to 15.71) 0.0132† 4.92 (1.32 to 18.31) 0.0175†
Clinical events
   Atrial fibrillation 2.26 (1.04 to 4.91) 0.0394† 3.12 (1.22 to 7.96) 0.0171†
   Ventricular tachycardia 0.33 (0.04 to 3.07) 0.3307 0.31 (0.03 to 3.31) 0.3296
   Death 0.48 (0.16 to 1.44) 0.1905 0.48 (0.15 to 1.57) 0.2265
*For age, sex, and cardiac diagnosis
†Significant at p<0.05.
COPD—chronic obstructive pulmonary disease; NSTEMI—Non-ST-elevation myocardial infarction; STEMI—ST-elevation myocardial infarction.


Key results
The rate of hypomagnesemia among patients with cardiac conditions in this study was 41.96%. We found out that COPD comorbidity, stroke comorbidity, diuretic therapy, and documented atrial fibrillation during admission among patients with cardiac conditions were associated with hypomagnesemia.

Strengths and limitations
We were able to estimate the rate of hypomagnesemia and determine the factors associated with low serum magnesium levels among patients with cardiac conditions in this study. Since our study had a cross-sectional design, and temporal or causal relationships of the factors associated with hypomagnesemia could not be ascertained, great caution should be exercised in the interpretation of these statistical associations.

In this study, the odds of having hypomagnesemia were 4.6 times as high among patients on diuretic medications than among those who were not taking diuretics. The use of diuretic agents have been linked to hypomagnesemia.19 Thiazides and loop-diuretics are mainly responsible for renal magnesium loss.20 21 It has been proposed that loop diuretics and osmotic diuretics increase magnesium excretion by increasing flow rate into the Henle’s loop and decreasing sodium chloride transport.22

Magnesium has been thought to play a role in the relaxation of bronchial smooth muscles.23 Low levels of serum magnesium have been associated with impaired pulmonary function, hyper-reactivity of the airways, and exacerbation of COPD.24 On the other hand, magnesium sulfate administration for acute bronchospasm has been reported to improve airway function.25 26 27 One interpretation of the association of hypomagnesemia with COPD comorbidity in our study is that it follows this exposure-outcome framework. However, based on the retrospective data that we collected in this study, we could not establish the exacerbation status of patients with recorded COPD comorbidity.

Cardiac arrhythmias and hypomagnesemia have been reported to occur concomitantly.20 28 Atrial fibrillation is the most common dysrhythmia, which occurs in 0.4% to 1.0% of the population.29 Magnesium is a cofactor in the sodium-potassium pump, and during hypomagnesemia, disruption in the function of the sodium-potassium pump can lead to abnormalities in the cardiac conduction system.4 Clinically, magnesium administration has a role in restoring sinus rhythm during atrial fibrillation.30 In our study, the odds of having atrial fibrillation were 2.26 times as high among patients with hypomagnesemia than among those without hypomagnesemia. Patients with atrial fibrillation would benefit from strict monitoring to detect hypomagnesemia that needs correction.31

It is not completely understood whether low magnesium levels promote the occurrence of stroke or vice versa. Relatively low serum magnesium levels have been observed among patients with stroke, and it has been suggested that the severity of cerebrovascular injury is inversely proportional to the serum magnesium levels.32 The neurological symptoms of hypomagnesemia, including mental status changes and acute focal deficits notably, can also mimic stroke in the clinical setting.33 Another possible explanation for the association of stroke with hypomagnesemia in this study is the strong association of hypomagnesemia and atrial fibrillation, which is a risk factor for stroke.34 35 After adjustment for age, sex, and cardiac diagnosis in this study, however, the association of stroke and hypomagnesemia did not show statistical significance, suggesting that the association is possibly mediated by other factors that modify stroke, hypomagnesemia, or both.

Hypomagnesemia is present in 20.2% of hospitalized patients.36 Several other studies reported varying rates of hypomagnesemia among different patient subgroups—6.59% among patients in the emergency room,37 8.75% to 18% among patients on dialysis,38 39 40 17.4% among patients with congestive heart failure,21 23.96% among patients in intensive care units,41 33.6% among patients with intracerebral hemorrhage,42 and 36% among elderly patients on long-term care.43 The rate of hypomagnesemia among patients with cardiac conditions in our study (41.96%) is higher than those reported in previous studies. The presence of several conditions associated with hypomagnesemia, such as concomitant COPD, stroke, or atrial fibrillation, can possibly account for this high rate of hypomagnesemia. Diuretic agents are commonly prescribed to patients with cardiac conditions complicated by heart failure, and this may also—at least partly—explain the high rate of hypomagnesemia among the patients with cardiac conditions in our study.

The results of this study are applicable to most patients with cardiac diagnoses since the clinical and demographic characteristics of our patients are similar to those of patients in other tertiary care hospitals. Males and females were equally represented in our study, and the age range of patients we included was quite broad. The most common cardiac diagnoses and their comorbidities were also well-represented among the patients in our study sample.


Among patients with cardiac conditions in this cross-sectional study, 41.96% had hypomagnesemia. COPD comorbidity, stroke comorbidity, diuretic therapy, and documented atrial fibrillation during admission were significantly associated with low serum magnesium levels.

In essence

For patients with cardiac conditions, keeping serum magnesium levels within normal limits is usually part of the therapeutic management.

In this study among patients with various cardiac diagnoses, 41.96% had hypomagnesemia.

Chronic obstructive pulmonary disease comorbidity, stroke comorbidity, taking diuretic medications, and documented atrial fibrillation during admission were all associated with hypomagnesemia.


We would like to thank Ms Aileen Ceballos for her assistance in the implementation of this research, and Dr Dizza R Dujali for reviewing the protocol and final report of this research.

Ethics approval

This study was reviewed and approved by the Department of Health XI Cluster Ethics Review Committee (DOH XI CERC reference P16060701).

Reporting guideline used

STROBE Checklist (http://www.strobe-statement.org/fileadmin/Strobe/uploads/checklists/STROBE_checklist_v4_combined.pdf)

Article source


Peer review



Supported by personal funds of the authors

Competing interests

None declared

Access and license

This is an Open Access article licensed under the Creative Commons Attribution-NonCommercial 4.0 International License, which allows others to share and adapt the work, provided that derivative works bear appropriate citation to this original work and are not used for commercial purposes. To view a copy of this license, visit http://creativecommons.org/licenses/by-nc/4.0/.


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June 25, 2017

Volume 4 Issue 1 (2018)


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